add boost/iterator as well

git-svn-id: svn://bind10.isc.org/svn/bind10/branches/f2f200910@234 e5f2f494-b856-4b98-b285-d166d9295462

23 files changed, 4886 insertions, 0 deletions

diff --git a/ext/boost/iterator/counting_iterator.hpp b/ext/boost/iterator/counting_iterator.hpp
new file mode 100644
index 0000000000..1298a31f55
--- /dev/null
+++ b/ext/boost/iterator/counting_iterator.hpp
@@ -0,0 +1,215 @@
+// Copyright David Abrahams 2003.
+// Distributed under the Boost Software License, Version 1.0. (See
+// accompanying file LICENSE_1_0.txt or copy at
+// http://www.boost.org/LICENSE_1_0.txt)
+#ifndef COUNTING_ITERATOR_DWA200348_HPP
+# define COUNTING_ITERATOR_DWA200348_HPP
+
+# include <boost/iterator/iterator_adaptor.hpp>
+# include <boost/detail/numeric_traits.hpp>
+# include <boost/mpl/bool.hpp>
+# include <boost/mpl/if.hpp>
+# include <boost/mpl/identity.hpp>
+# include <boost/mpl/eval_if.hpp>
+
+namespace boost {
+
+template <
+    class Incrementable
+  , class CategoryOrTraversal
+  , class Difference
+>
+class counting_iterator;
+
+namespace detail
+{
+  // Try to detect numeric types at compile time in ways compatible
+  // with the limitations of the compiler and library.
+  template <class T>
+  struct is_numeric_impl
+  {
+      // For a while, this wasn't true, but we rely on it below. This is a regression assert.
+      BOOST_STATIC_ASSERT(::boost::is_integral<char>::value);
+      
+# ifndef BOOST_NO_LIMITS_COMPILE_TIME_CONSTANTS
+      
+      BOOST_STATIC_CONSTANT(bool, value = std::numeric_limits<T>::is_specialized);
+      
+# else
+      
+#  if !BOOST_WORKAROUND(__BORLANDC__, BOOST_TESTED_AT(0x551))
+      BOOST_STATIC_CONSTANT(
+          bool, value = (
+              boost::is_convertible<int,T>::value
+           && boost::is_convertible<T,int>::value
+      ));
+#  else
+    BOOST_STATIC_CONSTANT(bool, value = ::boost::is_arithmetic<T>::value);
+#  endif
+      
+# endif
+  };
+
+  template <class T>
+  struct is_numeric
+    : mpl::bool_<(::boost::detail::is_numeric_impl<T>::value)>
+  {};
+
+#  if defined(BOOST_HAS_LONG_LONG)
+  template <>
+  struct is_numeric< ::boost::long_long_type>
+    : mpl::true_ {};
+  
+  template <>
+  struct is_numeric< ::boost::ulong_long_type>
+    : mpl::true_ {};
+#  endif
+
+  // Some compilers fail to have a numeric_limits specialization
+  template <>
+  struct is_numeric<wchar_t>
+    : mpl::true_ {};
+  
+  template <class T>
+  struct numeric_difference
+  {
+      typedef typename boost::detail::numeric_traits<T>::difference_type type;
+  };
+
+  BOOST_STATIC_ASSERT(is_numeric<int>::value);
+  
+  template <class Incrementable, class CategoryOrTraversal, class Difference>
+  struct counting_iterator_base
+  {
+      typedef typename detail::ia_dflt_help<
+          CategoryOrTraversal
+        , mpl::eval_if<
+              is_numeric<Incrementable>
+            , mpl::identity<random_access_traversal_tag>
+            , iterator_traversal<Incrementable>
+          >
+      >::type traversal;
+      
+      typedef typename detail::ia_dflt_help<
+          Difference
+        , mpl::eval_if<
+              is_numeric<Incrementable>
+            , numeric_difference<Incrementable>
+            , iterator_difference<Incrementable>
+          >
+      >::type difference;
+      
+      typedef iterator_adaptor<
+          counting_iterator<Incrementable, CategoryOrTraversal, Difference> // self
+        , Incrementable                                           // Base
+        , Incrementable                                           // Value
+# ifndef BOOST_ITERATOR_REF_CONSTNESS_KILLS_WRITABILITY
+          const  // MSVC won't strip this.  Instead we enable Thomas'
+                 // criterion (see boost/iterator/detail/facade_iterator_category.hpp)
+# endif 
+        , traversal
+        , Incrementable const&                                    // reference
+        , difference
+      > type;
+  };
+
+  // Template class distance_policy_select -- choose a policy for computing the
+  // distance between counting_iterators at compile-time based on whether or not
+  // the iterator wraps an integer or an iterator, using "poor man's partial
+  // specialization".
+
+  template <bool is_integer> struct distance_policy_select;
+
+  // A policy for wrapped iterators
+  template <class Difference, class Incrementable1, class Incrementable2>
+  struct iterator_distance
+  {
+      static Difference distance(Incrementable1 x, Incrementable2 y)
+      {
+          return y - x;
+      }
+  };
+
+  // A policy for wrapped numbers
+  template <class Difference, class Incrementable1, class Incrementable2>
+  struct number_distance
+  {
+      static Difference distance(Incrementable1 x, Incrementable2 y)
+      {
+          return numeric_distance(x, y);
+      }
+  };
+}
+
+template <
+    class Incrementable
+  , class CategoryOrTraversal = use_default
+  , class Difference = use_default
+>
+class counting_iterator
+  : public detail::counting_iterator_base<
+        Incrementable, CategoryOrTraversal, Difference
+    >::type
+{
+    typedef typename detail::counting_iterator_base<
+        Incrementable, CategoryOrTraversal, Difference
+    >::type super_t;
+    
+    friend class iterator_core_access;
+
+ public:
+    typedef typename super_t::difference_type difference_type;
+
+    counting_iterator() { }
+    
+    counting_iterator(counting_iterator const& rhs) : super_t(rhs.base()) {}
+
+    counting_iterator(Incrementable x)
+      : super_t(x)
+    {
+    }
+
+# if 0
+    template<class OtherIncrementable>
+    counting_iterator(
+        counting_iterator<OtherIncrementable, CategoryOrTraversal, Difference> const& t
+      , typename enable_if_convertible<OtherIncrementable, Incrementable>::type* = 0
+    )
+      : super_t(t.base())
+    {}
+# endif 
+
+ private:
+    
+    typename super_t::reference dereference() const
+    {
+        return this->base_reference();
+    }
+
+    template <class OtherIncrementable>
+    difference_type
+    distance_to(counting_iterator<OtherIncrementable, CategoryOrTraversal, Difference> const& y) const
+    {
+      typedef typename mpl::if_<
+          detail::is_numeric<Incrementable>
+        , detail::number_distance<difference_type, Incrementable, OtherIncrementable>
+        , detail::iterator_distance<difference_type, Incrementable, OtherIncrementable>
+      >::type d;
+
+      return d::distance(this->base(), y.base());
+    }
+};
+
+// Manufacture a counting iterator for an arbitrary incrementable type
+template <class Incrementable>
+inline counting_iterator<Incrementable>
+make_counting_iterator(Incrementable x)
+{
+  typedef counting_iterator<Incrementable> result_t;
+  return result_t(x);
+}
+
+
+} // namespace boost::iterator
+
+#endif // COUNTING_ITERATOR_DWA200348_HPP
diff --git a/ext/boost/iterator/detail/any_conversion_eater.hpp b/ext/boost/iterator/detail/any_conversion_eater.hpp
new file mode 100644
index 0000000000..25fa644889
--- /dev/null
+++ b/ext/boost/iterator/detail/any_conversion_eater.hpp
@@ -0,0 +1,19 @@
+// Copyright David Abrahams 2003. Use, modification and distribution is
+// subject to the Boost Software License, Version 1.0. (See accompanying
+// file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
+#ifndef ANY_CONVERSION_EATER_DWA20031117_HPP
+# define ANY_CONVERSION_EATER_DWA20031117_HPP
+
+namespace boost { namespace detail {
+
+// This type can be used in traits to "eat" up the one user-defined
+// implicit conversion allowed.
+struct any_conversion_eater
+{
+    template <class T>
+    any_conversion_eater(T const&);
+};
+
+}} // namespace boost::detail
+
+#endif // ANY_CONVERSION_EATER_DWA20031117_HPP
diff --git a/ext/boost/iterator/detail/config_def.hpp b/ext/boost/iterator/detail/config_def.hpp
new file mode 100644
index 0000000000..fa8d667d97
--- /dev/null
+++ b/ext/boost/iterator/detail/config_def.hpp
@@ -0,0 +1,137 @@
+// (C) Copyright David Abrahams 2002.
+// (C) Copyright Jeremy Siek    2002.
+// (C) Copyright Thomas Witt    2002.
+// Distributed under the Boost Software License, Version 1.0. (See
+// accompanying file LICENSE_1_0.txt or copy at
+// http://www.boost.org/LICENSE_1_0.txt)
+
+// no include guard multiple inclusion intended
+
+//
+// This is a temporary workaround until the bulk of this is
+// available in boost config.
+// 23/02/03 thw
+//
+
+#include <boost/config.hpp> // for prior
+#include <boost/detail/workaround.hpp>
+
+#ifdef BOOST_ITERATOR_CONFIG_DEF
+# error you have nested config_def #inclusion.
+#else 
+# define BOOST_ITERATOR_CONFIG_DEF
+#endif 
+
+// We enable this always now.  Otherwise, the simple case in
+// libs/iterator/test/constant_iterator_arrow.cpp fails to compile
+// because the operator-> return is improperly deduced as a non-const
+// pointer.
+#if 1 || defined(BOOST_NO_TEMPLATE_PARTIAL_SPECIALIZATION)           \
+    || BOOST_WORKAROUND(__BORLANDC__, BOOST_TESTED_AT(0x531))
+
+// Recall that in general, compilers without partial specialization
+// can't strip constness.  Consider counting_iterator, which normally
+// passes a const Value to iterator_facade.  As a result, any code
+// which makes a std::vector of the iterator's value_type will fail
+// when its allocator declares functions overloaded on reference and
+// const_reference (the same type).
+//
+// Furthermore, Borland 5.5.1 drops constness in enough ways that we
+// end up using a proxy for operator[] when we otherwise shouldn't.
+// Using reference constness gives it an extra hint that it can
+// return the value_type from operator[] directly, but is not
+// strictly necessary.  Not sure how best to resolve this one.
+
+# define BOOST_ITERATOR_REF_CONSTNESS_KILLS_WRITABILITY 1
+
+#endif
+
+#if BOOST_WORKAROUND(BOOST_MSVC, <= 1300)                                       \
+    || BOOST_WORKAROUND(__BORLANDC__, BOOST_TESTED_AT(0x5A0))                   \
+    || (BOOST_WORKAROUND(BOOST_INTEL_CXX_VERSION, <= 700) && defined(_MSC_VER)) \
+    || BOOST_WORKAROUND(__DECCXX_VER, BOOST_TESTED_AT(60590042))                \
+    || BOOST_WORKAROUND(__SUNPRO_CC, BOOST_TESTED_AT(0x590))
+    
+# define BOOST_NO_LVALUE_RETURN_DETECTION
+
+# if 0 // test code
+  struct v  {};
+
+  typedef  char (&no)[3];
+
+  template <class T>
+  no foo(T const&, ...);
+
+  template <class T>
+  char foo(T&, int);
+
+
+  struct value_iterator
+  {
+      v operator*() const;
+  };
+
+  template <class T>
+  struct lvalue_deref_helper
+  {
+      static T& x;
+      enum { value = (sizeof(foo(*x,0)) == 1) };
+  };
+
+  int z2[(lvalue_deref_helper<v*>::value == 1) ? 1 : -1];
+  int z[(lvalue_deref_helper<value_iterator>::value) == 1 ? -1 : 1 ];
+# endif 
+
+#endif
+
+#if BOOST_WORKAROUND(__MWERKS__, <=0x2407)
+#  define BOOST_NO_IS_CONVERTIBLE // "is_convertible doesn't work for simple types"
+#endif
+
+#if BOOST_WORKAROUND(__GNUC__, == 2)                                                                            \
+    || BOOST_WORKAROUND(__GNUC__, == 3) && BOOST_WORKAROUND(__GNUC_MINOR__, < 4) && !defined(__EDG_VERSION__)   \
+    || BOOST_WORKAROUND(__BORLANDC__, BOOST_TESTED_AT(0x551))
+#  define BOOST_NO_IS_CONVERTIBLE_TEMPLATE // The following program fails to compile:
+
+#  if 0 // test code
+    #include <boost/type_traits/is_convertible.hpp>
+    template <class T>
+    struct foo
+    {
+        foo(T);
+
+        template <class U>
+        foo(foo<U> const& other) : p(other.p) { }
+
+        T p;
+    };
+
+    bool x = boost::is_convertible<foo<int const*>, foo<int*> >::value;
+#  endif
+
+#endif
+
+
+#if !defined(BOOST_MSVC) && (defined(BOOST_NO_SFINAE) || defined(BOOST_NO_IS_CONVERTIBLE) || defined(BOOST_NO_IS_CONVERTIBLE_TEMPLATE))
+# define BOOST_NO_STRICT_ITERATOR_INTEROPERABILITY
+#endif 
+
+# if !BOOST_WORKAROUND(BOOST_MSVC, <= 1300)
+#  define BOOST_ARG_DEPENDENT_TYPENAME typename
+# else
+#  define BOOST_ARG_DEPENDENT_TYPENAME
+# endif
+
+# if BOOST_WORKAROUND(__GNUC__, == 2) && BOOST_WORKAROUND(__GNUC_MINOR__, BOOST_TESTED_AT(95)) \
+    || BOOST_WORKAROUND(__BORLANDC__, BOOST_TESTED_AT(0x564))
+
+// GCC-2.95 eagerly instantiates templated constructors and conversion
+// operators in convertibility checks, causing premature errors.
+//
+// Borland's problems are harder to diagnose due to lack of an
+// instantiation stack backtrace.  They may be due in part to the fact
+// that it drops cv-qualification willy-nilly in templates.
+#  define BOOST_NO_ONE_WAY_ITERATOR_INTEROP
+# endif 
+
+// no include guard; multiple inclusion intended
diff --git a/ext/boost/iterator/detail/config_undef.hpp b/ext/boost/iterator/detail/config_undef.hpp
new file mode 100644
index 0000000000..9dcd1d525f
--- /dev/null
+++ b/ext/boost/iterator/detail/config_undef.hpp
@@ -0,0 +1,25 @@
+// (C) Copyright Thomas Witt    2002.
+// Distributed under the Boost Software License, Version 1.0. (See
+// accompanying file LICENSE_1_0.txt or copy at
+// http://www.boost.org/LICENSE_1_0.txt)
+
+// no include guard multiple inclusion intended
+
+//
+// This is a temporary workaround until the bulk of this is
+// available in boost config.
+// 23/02/03 thw
+//
+
+#undef BOOST_NO_IS_CONVERTIBLE
+#undef BOOST_NO_IS_CONVERTIBLE_TEMPLATE
+#undef BOOST_NO_STRICT_ITERATOR_INTEROPERABILITY
+#undef BOOST_ARG_DEPENDENT_TYPENAME
+#undef BOOST_NO_LVALUE_RETURN_DETECTION
+#undef BOOST_NO_ONE_WAY_ITERATOR_INTEROP
+
+#ifdef BOOST_ITERATOR_CONFIG_DEF
+# undef BOOST_ITERATOR_CONFIG_DEF
+#else
+# error missing or nested #include config_def
+#endif 
diff --git a/ext/boost/iterator/detail/enable_if.hpp b/ext/boost/iterator/detail/enable_if.hpp
new file mode 100644
index 0000000000..0fd36fc4bc
--- /dev/null
+++ b/ext/boost/iterator/detail/enable_if.hpp
@@ -0,0 +1,86 @@
+// (C) Copyright David Abrahams 2002.
+// (C) Copyright Jeremy Siek    2002.
+// (C) Copyright Thomas Witt    2002.
+// Distributed under the Boost Software License, Version 1.0. (See
+// accompanying file LICENSE_1_0.txt or copy at
+// http://www.boost.org/LICENSE_1_0.txt)
+#ifndef BOOST_ENABLE_IF_23022003THW_HPP
+#define BOOST_ENABLE_IF_23022003THW_HPP
+
+#include <boost/detail/workaround.hpp>
+#include <boost/mpl/identity.hpp>
+
+#include <boost/iterator/detail/config_def.hpp>
+
+//
+// Boost iterators uses its own enable_if cause we need
+// special semantics for deficient compilers.
+// 23/02/03 thw
+//
+
+namespace boost
+{
+
+  namespace iterators
+  {
+    //
+    // Base machinery for all kinds of enable if
+    //
+    template<bool>
+    struct enabled
+    {
+      template<typename T>
+      struct base
+      {
+        typedef T type;
+      };
+    };
+    
+    //
+    // For compilers that don't support "Substitution Failure Is Not An Error"
+    // enable_if falls back to always enabled. See comments
+    // on operator implementation for consequences.
+    //
+    template<>
+    struct enabled<false>
+    {
+      template<typename T>
+      struct base
+      {
+#ifdef BOOST_NO_SFINAE
+
+        typedef T type;
+
+        // This way to do it would give a nice error message containing
+        // invalid overload, but has the big disadvantage that
+        // there is no reference to user code in the error message.
+        //
+        // struct invalid_overload;
+        // typedef invalid_overload type;
+        //
+#endif
+      };
+    };
+
+
+    template <class Cond,
+              class Return>
+    struct enable_if
+# if !defined(BOOST_NO_SFINAE) && !defined(BOOST_NO_IS_CONVERTIBLE)
+      : enabled<(Cond::value)>::template base<Return>
+# else
+      : mpl::identity<Return>
+# endif 
+    {
+# if BOOST_WORKAROUND(BOOST_MSVC, < 1300)
+        typedef Return type;
+# endif 
+    };
+
+  } // namespace iterators
+
+} // namespace boost
+
+#include <boost/iterator/detail/config_undef.hpp>
+
+#endif // BOOST_ENABLE_IF_23022003THW_HPP
diff --git a/ext/boost/iterator/detail/facade_iterator_category.hpp b/ext/boost/iterator/detail/facade_iterator_category.hpp
new file mode 100644
index 0000000000..2c4771d5aa
--- /dev/null
+++ b/ext/boost/iterator/detail/facade_iterator_category.hpp
@@ -0,0 +1,200 @@
+// Copyright David Abrahams 2003. Use, modification and distribution is
+// subject to the Boost Software License, Version 1.0. (See accompanying
+// file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
+#ifndef FACADE_ITERATOR_CATEGORY_DWA20031118_HPP
+# define FACADE_ITERATOR_CATEGORY_DWA20031118_HPP
+
+# include <boost/iterator/iterator_categories.hpp>
+
+# include <boost/mpl/or.hpp>  // used in iterator_tag inheritance logic
+# include <boost/mpl/and.hpp>
+# include <boost/mpl/if.hpp>
+# include <boost/mpl/eval_if.hpp>
+# include <boost/mpl/identity.hpp>
+# include <boost/mpl/assert.hpp>
+
+# include <boost/type_traits/is_same.hpp>
+# include <boost/type_traits/is_const.hpp>
+# include <boost/type_traits/is_reference.hpp>
+# include <boost/type_traits/is_convertible.hpp>
+
+# include <boost/type_traits/is_same.hpp>
+
+# include <boost/iterator/detail/config_def.hpp> // try to keep this last
+
+# ifdef BOOST_ITERATOR_REF_CONSTNESS_KILLS_WRITABILITY
+#  include <boost/detail/indirect_traits.hpp>
+# endif
+
+//
+// iterator_category deduction for iterator_facade
+//
+
+// forward declaration
+namespace boost { struct use_default; }
+
+namespace boost { namespace detail  {
+
+struct input_output_iterator_tag
+  : std::input_iterator_tag
+{
+    // Using inheritance for only input_iterator_tag helps to avoid
+    // ambiguities when a stdlib implementation dispatches on a
+    // function which is overloaded on both input_iterator_tag and
+    // output_iterator_tag, as STLPort does, in its __valid_range
+    // function.  I claim it's better to avoid the ambiguity in these
+    // cases.
+    operator std::output_iterator_tag() const
+    {
+        return std::output_iterator_tag();
+    }
+};
+
+//
+// True iff the user has explicitly disabled writability of this
+// iterator.  Pass the iterator_facade's Value parameter and its
+// nested ::reference type.
+//
+template <class ValueParam, class Reference>
+struct iterator_writability_disabled
+# ifdef BOOST_ITERATOR_REF_CONSTNESS_KILLS_WRITABILITY // Adding Thomas' logic?
+  : mpl::or_<
+        is_const<Reference>
+      , boost::detail::indirect_traits::is_reference_to_const<Reference>
+      , is_const<ValueParam>
+    >
+# else 
+  : is_const<ValueParam>
+# endif 
+{};
+
+
+//
+// Convert an iterator_facade's traversal category, Value parameter,
+// and ::reference type to an appropriate old-style category.
+//
+// If writability has been disabled per the above metafunction, the
+// result will not be convertible to output_iterator_tag.
+//
+// Otherwise, if Traversal == single_pass_traversal_tag, the following
+// conditions will result in a tag that is convertible both to
+// input_iterator_tag and output_iterator_tag:
+//
+//    1. Reference is a reference to non-const
+//    2. Reference is not a reference and is convertible to Value
+//
+template <class Traversal, class ValueParam, class Reference>
+struct iterator_facade_default_category
+  : mpl::eval_if<
+        mpl::and_<
+            is_reference<Reference>
+          , is_convertible<Traversal,forward_traversal_tag>
+        >
+      , mpl::eval_if<
+            is_convertible<Traversal,random_access_traversal_tag>
+          , mpl::identity<std::random_access_iterator_tag>
+          , mpl::if_<
+                is_convertible<Traversal,bidirectional_traversal_tag>
+              , std::bidirectional_iterator_tag
+              , std::forward_iterator_tag
+            >
+        >
+      , typename mpl::eval_if<
+            mpl::and_<
+                is_convertible<Traversal, single_pass_traversal_tag>
+                
+                // check for readability
+              , is_convertible<Reference, ValueParam>
+            >
+          , mpl::identity<std::input_iterator_tag>
+          , mpl::identity<Traversal>
+        >
+    >
+{
+};
+
+// True iff T is convertible to an old-style iterator category.
+template <class T>
+struct is_iterator_category
+  : mpl::or_<
+        is_convertible<T,std::input_iterator_tag>
+      , is_convertible<T,std::output_iterator_tag>
+    >
+{
+};
+
+template <class T>
+struct is_iterator_traversal
+  : is_convertible<T,incrementable_traversal_tag>
+{};
+
+//
+// A composite iterator_category tag convertible to Category (a pure
+// old-style category) and Traversal (a pure traversal tag).
+// Traversal must be a strict increase of the traversal power given by
+// Category.
+//
+template <class Category, class Traversal>
+struct iterator_category_with_traversal
+  : Category, Traversal
+{
+# if !BOOST_WORKAROUND(BOOST_MSVC, <= 1300)
+    // Make sure this isn't used to build any categories where
+    // convertibility to Traversal is redundant.  Should just use the
+    // Category element in that case.
+    BOOST_MPL_ASSERT_NOT((
+        is_convertible<
+              typename iterator_category_to_traversal<Category>::type
+            , Traversal
+          >));
+
+    BOOST_MPL_ASSERT((is_iterator_category<Category>));
+    BOOST_MPL_ASSERT_NOT((is_iterator_category<Traversal>));
+    BOOST_MPL_ASSERT_NOT((is_iterator_traversal<Category>));
+#  if !BOOST_WORKAROUND(BOOST_MSVC, BOOST_TESTED_AT(1310))
+    BOOST_MPL_ASSERT((is_iterator_traversal<Traversal>));
+#  endif 
+# endif 
+};
+
+// Computes an iterator_category tag whose traversal is Traversal and
+// which is appropriate for an iterator
+template <class Traversal, class ValueParam, class Reference>
+struct facade_iterator_category_impl
+{
+# if !BOOST_WORKAROUND(BOOST_MSVC, <= 1300)
+    BOOST_MPL_ASSERT_NOT((is_iterator_category<Traversal>));
+# endif 
+    
+    typedef typename iterator_facade_default_category<
+        Traversal,ValueParam,Reference
+    >::type category;
+    
+    typedef typename mpl::if_<
+        is_same<
+            Traversal
+          , typename iterator_category_to_traversal<category>::type
+        >
+      , category
+      , iterator_category_with_traversal<category,Traversal>
+    >::type type;
+};
+
+//
+// Compute an iterator_category for iterator_facade
+//
+template <class CategoryOrTraversal, class ValueParam, class Reference>
+struct facade_iterator_category
+  : mpl::eval_if<
+        is_iterator_category<CategoryOrTraversal>
+      , mpl::identity<CategoryOrTraversal> // old-style categories are fine as-is
+      , facade_iterator_category_impl<CategoryOrTraversal,ValueParam,Reference>
+    >
+{
+};
+
+}} // namespace boost::detail
+
+# include <boost/iterator/detail/config_undef.hpp>
+
+#endif // FACADE_ITERATOR_CATEGORY_DWA20031118_HPP
diff --git a/ext/boost/iterator/detail/minimum_category.hpp b/ext/boost/iterator/detail/minimum_category.hpp
new file mode 100644
index 0000000000..96501ddd46
--- /dev/null
+++ b/ext/boost/iterator/detail/minimum_category.hpp
@@ -0,0 +1,116 @@
+// Copyright David Abrahams 2003. Use, modification and distribution is
+// subject to the Boost Software License, Version 1.0. (See accompanying
+// file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
+#ifndef MINIMUM_CATEGORY_DWA20031119_HPP
+# define MINIMUM_CATEGORY_DWA20031119_HPP
+
+# include <boost/type_traits/is_convertible.hpp>
+# include <boost/type_traits/is_same.hpp>
+
+# include <boost/mpl/aux_/lambda_support.hpp>
+
+namespace boost { namespace detail { 
+//
+// Returns the minimum category type or error_type
+// if T1 and T2 are unrelated.
+//
+// For compilers not supporting is_convertible this only
+// works with the new boost return and traversal category
+// types. The exact boost _types_ are required. No derived types
+// will work. 
+//
+//
+template <bool GreaterEqual, bool LessEqual>
+struct minimum_category_impl
+# if BOOST_WORKAROUND(BOOST_MSVC, < 1300)
+{
+    template <class T1, class T2> struct apply
+    {
+        typedef T2 type;
+    };
+    typedef void type;
+}
+# endif 
+;
+
+template <class T1, class T2>
+struct error_not_related_by_convertibility;
+  
+template <>
+struct minimum_category_impl<true,false>
+{
+    template <class T1, class T2> struct apply
+    {
+        typedef T2 type;
+    };
+};
+
+template <>
+struct minimum_category_impl<false,true>
+{
+    template <class T1, class T2> struct apply
+    {
+        typedef T1 type;
+    };
+};
+
+template <>
+struct minimum_category_impl<true,true>
+{
+    template <class T1, class T2> struct apply
+    {
+        BOOST_STATIC_ASSERT((is_same<T1,T2>::value));
+        typedef T1 type;
+    };
+};
+
+template <>
+struct minimum_category_impl<false,false>
+{
+    template <class T1, class T2> struct apply
+    : error_not_related_by_convertibility<T1,T2>
+    {
+    };
+};
+
+template <class T1 = mpl::_1, class T2 = mpl::_2>
+struct minimum_category
+{
+    typedef minimum_category_impl< 
+# if BOOST_WORKAROUND(BOOST_MSVC, < 1300) // ETI workaround
+        is_same<T2,int>::value ||
+# endif 
+        ::boost::is_convertible<T1,T2>::value
+      , ::boost::is_convertible<T2,T1>::value
+# if BOOST_WORKAROUND(BOOST_MSVC, < 1300) // ETI workaround
+        || is_same<T1,int>::value
+# endif 
+    > outer;
+
+    typedef typename outer::template apply<T1,T2> inner;
+    typedef typename inner::type type;
+      
+    BOOST_MPL_AUX_LAMBDA_SUPPORT(2,minimum_category,(T1,T2))
+};
+    
+template <>
+struct minimum_category<mpl::_1,mpl::_2>
+{
+    template <class T1, class T2>
+    struct apply : minimum_category<T1,T2>
+    {};
+
+    BOOST_MPL_AUX_LAMBDA_SUPPORT_SPEC(2,minimum_category,(mpl::_1,mpl::_2))
+};
+
+# if BOOST_WORKAROUND(BOOST_MSVC, < 1300) // ETI workaround
+template <>
+struct minimum_category<int,int>
+{
+    typedef int type;
+};
+# endif
+    
+}} // namespace boost::detail
+
+#endif // MINIMUM_CATEGORY_DWA20031119_HPP
diff --git a/ext/boost/iterator/filter_iterator.hpp b/ext/boost/iterator/filter_iterator.hpp
new file mode 100644
index 0000000000..14d640bf09
--- /dev/null
+++ b/ext/boost/iterator/filter_iterator.hpp
@@ -0,0 +1,135 @@
+// (C) Copyright David Abrahams 2002.
+// (C) Copyright Jeremy Siek    2002.
+// (C) Copyright Thomas Witt    2002.
+// Distributed under the Boost Software License, Version 1.0. (See
+// accompanying file LICENSE_1_0.txt or copy at
+// http://www.boost.org/LICENSE_1_0.txt)
+#ifndef BOOST_FILTER_ITERATOR_23022003THW_HPP
+#define BOOST_FILTER_ITERATOR_23022003THW_HPP
+
+#include <boost/iterator.hpp>
+#include <boost/iterator/iterator_adaptor.hpp>
+#include <boost/iterator/iterator_categories.hpp>
+
+#include <boost/type_traits/is_class.hpp>
+#include <boost/static_assert.hpp>
+
+namespace boost
+{
+  template <class Predicate, class Iterator>
+  class filter_iterator;
+
+  namespace detail
+  {
+    template <class Predicate, class Iterator>
+    struct filter_iterator_base
+    {
+        typedef iterator_adaptor<
+            filter_iterator<Predicate, Iterator>
+          , Iterator
+          , use_default
+          , typename mpl::if_<
+                is_convertible<
+                    typename iterator_traversal<Iterator>::type
+                  , random_access_traversal_tag
+                >
+              , bidirectional_traversal_tag
+              , use_default
+            >::type
+        > type;
+    };
+  }
+  
+  template <class Predicate, class Iterator>
+  class filter_iterator
+    : public detail::filter_iterator_base<Predicate, Iterator>::type
+  {
+      typedef typename detail::filter_iterator_base<
+          Predicate, Iterator
+      >::type super_t;
+
+      friend class iterator_core_access;
+
+   public:
+      filter_iterator() { }
+
+      filter_iterator(Predicate f, Iterator x, Iterator end_ = Iterator())
+          : super_t(x), m_predicate(f), m_end(end_)
+      {
+          satisfy_predicate();
+      }
+
+      filter_iterator(Iterator x, Iterator end_ = Iterator())
+        : super_t(x), m_predicate(), m_end(end_)
+      {
+        // Pro8 is a little too aggressive about instantiating the
+        // body of this function.
+#if !BOOST_WORKAROUND(__MWERKS__, BOOST_TESTED_AT(0x3003))
+          // Don't allow use of this constructor if Predicate is a
+          // function pointer type, since it will be 0.
+          BOOST_STATIC_ASSERT(is_class<Predicate>::value);
+#endif 
+          satisfy_predicate();
+      }
+
+      template<class OtherIterator>
+      filter_iterator(
+          filter_iterator<Predicate, OtherIterator> const& t
+          , typename enable_if_convertible<OtherIterator, Iterator>::type* = 0
+          )
+          : super_t(t.base()), m_predicate(t.predicate()), m_end(t.end()) {}
+
+      Predicate predicate() const { return m_predicate; }
+
+      Iterator end() const { return m_end; }
+
+   private:
+      void increment()
+      {
+          ++(this->base_reference());
+          satisfy_predicate();
+      }
+
+      void decrement()
+      {
+        while(!this->m_predicate(*--(this->base_reference()))){};
+      }
+
+      void satisfy_predicate()
+      {
+          while (this->base() != this->m_end && !this->m_predicate(*this->base()))
+              ++(this->base_reference());
+      }
+
+      // Probably should be the initial base class so it can be
+      // optimized away via EBO if it is an empty class.
+      Predicate m_predicate;
+      Iterator m_end;
+  };
+
+  template <class Predicate, class Iterator>
+  filter_iterator<Predicate,Iterator>
+  make_filter_iterator(Predicate f, Iterator x, Iterator end = Iterator())
+  {
+      return filter_iterator<Predicate,Iterator>(f,x,end);
+  }
+
+  template <class Predicate, class Iterator>
+  filter_iterator<Predicate,Iterator>
+  make_filter_iterator(
+      typename iterators::enable_if<
+          is_class<Predicate>
+        , Iterator
+      >::type x
+    , Iterator end = Iterator()
+#if BOOST_WORKAROUND(BOOST_MSVC, < 1300)
+    , Predicate* = 0
+#endif 
+  )
+  {
+      return filter_iterator<Predicate,Iterator>(x,end);
+  }
+
+} // namespace boost
+
+#endif // BOOST_FILTER_ITERATOR_23022003THW_HPP
diff --git a/ext/boost/iterator/indirect_iterator.hpp b/ext/boost/iterator/indirect_iterator.hpp
new file mode 100644
index 0000000000..abff7e7634
--- /dev/null
+++ b/ext/boost/iterator/indirect_iterator.hpp
@@ -0,0 +1,139 @@
+// (C) Copyright David Abrahams 2002.
+// (C) Copyright Jeremy Siek    2002.
+// (C) Copyright Thomas Witt    2002.
+// Distributed under the Boost Software License, Version 1.0. (See
+// accompanying file LICENSE_1_0.txt or copy at
+// http://www.boost.org/LICENSE_1_0.txt)
+#ifndef BOOST_INDIRECT_ITERATOR_23022003THW_HPP
+#define BOOST_INDIRECT_ITERATOR_23022003THW_HPP
+
+#include <boost/iterator.hpp>
+#include <boost/iterator/iterator_adaptor.hpp>
+
+#include <boost/pointee.hpp>
+#include <boost/indirect_reference.hpp>
+#include <boost/detail/iterator.hpp>
+
+#include <boost/detail/indirect_traits.hpp>
+
+#include <boost/type_traits/is_same.hpp>
+#include <boost/type_traits/add_reference.hpp>
+
+#include <boost/mpl/bool.hpp>
+#include <boost/mpl/identity.hpp>
+#include <boost/mpl/eval_if.hpp>
+#include <boost/mpl/not.hpp>
+#include <boost/mpl/has_xxx.hpp>
+
+#ifdef BOOST_MPL_CFG_NO_HAS_XXX
+# include <boost/shared_ptr.hpp>
+# include <boost/scoped_ptr.hpp>
+# include <boost/mpl/bool.hpp>
+# include <memory>
+#endif 
+
+#include <boost/iterator/detail/config_def.hpp> // must be last #include
+
+namespace boost
+{
+  template <class Iter, class Value, class Category, class Reference, class Difference>
+  class indirect_iterator;
+
+  namespace detail
+  {
+    template <class Iter, class Value, class Category, class Reference, class Difference>
+    struct indirect_base
+    {
+        typedef typename iterator_traits<Iter>::value_type dereferenceable;
+        
+        typedef iterator_adaptor<
+            indirect_iterator<Iter, Value, Category, Reference, Difference>
+          , Iter
+          , typename ia_dflt_help<
+                Value, pointee<dereferenceable>
+            >::type
+          , Category
+          , typename ia_dflt_help<
+                Reference
+              , mpl::eval_if<
+                    is_same<Value,use_default>
+                  , indirect_reference<dereferenceable>
+                  , add_reference<Value>
+                >
+            >::type
+          , Difference
+        > type;
+    };
+
+    template <>
+    struct indirect_base<int, int, int, int, int> {};
+  } // namespace detail
+
+    
+  template <
+      class Iterator
+    , class Value = use_default
+    , class Category = use_default
+    , class Reference = use_default
+    , class Difference = use_default
+  >
+  class indirect_iterator
+    : public detail::indirect_base<
+        Iterator, Value, Category, Reference, Difference
+      >::type
+  {
+      typedef typename detail::indirect_base<
+          Iterator, Value, Category, Reference, Difference
+      >::type super_t;
+
+      friend class iterator_core_access;
+
+   public:
+      indirect_iterator() {}
+
+      indirect_iterator(Iterator iter)
+        : super_t(iter) {}
+
+      template <
+          class Iterator2, class Value2, class Category2
+        , class Reference2, class Difference2
+      >
+      indirect_iterator(
+          indirect_iterator<
+               Iterator2, Value2, Category2, Reference2, Difference2
+          > const& y
+        , typename enable_if_convertible<Iterator2, Iterator>::type* = 0
+      )
+        : super_t(y.base())
+      {}
+
+  private:    
+      typename super_t::reference dereference() const
+      {
+# if BOOST_WORKAROUND(__BORLANDC__, < 0x5A0 )
+          return const_cast<super_t::reference>(**this->base());
+# else
+          return **this->base();
+# endif 
+      }
+  };
+
+  template <class Iter>
+  inline
+  indirect_iterator<Iter> make_indirect_iterator(Iter x)
+  {
+    return indirect_iterator<Iter>(x);
+  }
+
+  template <class Traits, class Iter>
+  inline
+  indirect_iterator<Iter,Traits> make_indirect_iterator(Iter x, Traits* = 0)
+  {
+    return indirect_iterator<Iter, Traits>(x);
+  }
+
+} // namespace boost
+
+#include <boost/iterator/detail/config_undef.hpp>
+
+#endif // BOOST_INDIRECT_ITERATOR_23022003THW_HPP
diff --git a/ext/boost/iterator/interoperable.hpp b/ext/boost/iterator/interoperable.hpp
new file mode 100644
index 0000000000..c13dd9b47b
--- /dev/null
+++ b/ext/boost/iterator/interoperable.hpp
@@ -0,0 +1,50 @@
+// (C) Copyright David Abrahams 2002.
+// (C) Copyright Jeremy Siek    2002.
+// (C) Copyright Thomas Witt    2002.
+// Distributed under the Boost Software License, Version 1.0. (See
+// accompanying file LICENSE_1_0.txt or copy at
+// http://www.boost.org/LICENSE_1_0.txt)
+#ifndef BOOST_INTEROPERABLE_23022003THW_HPP
+# define BOOST_INTEROPERABLE_23022003THW_HPP
+
+# include <boost/mpl/bool.hpp>
+# include <boost/mpl/or.hpp>
+
+# include <boost/type_traits/is_convertible.hpp>
+
+# include <boost/iterator/detail/config_def.hpp> // must appear last
+
+namespace boost
+{
+
+  //
+  // Meta function that determines whether two
+  // iterator types are considered interoperable.
+  //
+  // Two iterator types A,B are considered interoperable if either
+  // A is convertible to B or vice versa.
+  // This interoperability definition is in sync with the
+  // standards requirements on constant/mutable container
+  // iterators (23.1 [lib.container.requirements]).
+  //
+  // For compilers that don't support is_convertible 
+  // is_interoperable gives false positives. See comments
+  // on operator implementation for consequences.
+  //
+  template <typename A, typename B>
+  struct is_interoperable
+# ifdef BOOST_NO_STRICT_ITERATOR_INTEROPERABILITY
+    : mpl::true_
+# else
+    : mpl::or_<
+          is_convertible< A, B >
+        , is_convertible< B, A > >
+# endif
+  { 
+  };
+
+} // namespace boost
+
+# include <boost/iterator/detail/config_undef.hpp>
+
+#endif // BOOST_INTEROPERABLE_23022003THW_HPP
diff --git a/ext/boost/iterator/is_lvalue_iterator.hpp b/ext/boost/iterator/is_lvalue_iterator.hpp
new file mode 100644
index 0000000000..3beb90df6d
--- /dev/null
+++ b/ext/boost/iterator/is_lvalue_iterator.hpp
@@ -0,0 +1,150 @@
+// Copyright David Abrahams 2003. Use, modification and distribution is
+// subject to the Boost Software License, Version 1.0. (See accompanying
+// file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
+#ifndef IS_LVALUE_ITERATOR_DWA2003112_HPP
+# define IS_LVALUE_ITERATOR_DWA2003112_HPP
+
+#include <boost/iterator.hpp>
+
+#include <boost/detail/workaround.hpp>
+#include <boost/detail/iterator.hpp>
+
+#include <boost/iterator/detail/any_conversion_eater.hpp>
+
+// should be the last #includes
+#include <boost/type_traits/detail/bool_trait_def.hpp>
+#include <boost/iterator/detail/config_def.hpp>
+
+#ifndef BOOST_NO_IS_CONVERTIBLE
+
+namespace boost {
+ 
+namespace detail
+{
+#ifndef BOOST_NO_LVALUE_RETURN_DETECTION
+  // Calling lvalue_preserver( <expression>, 0 ) returns a reference
+  // to the expression's result if <expression> is an lvalue, or
+  // not_an_lvalue() otherwise.
+  struct not_an_lvalue {};
+  
+  template <class T>
+  T& lvalue_preserver(T&, int);
+  
+  template <class U>
+  not_an_lvalue lvalue_preserver(U const&, ...);
+  
+# define BOOST_LVALUE_PRESERVER(expr) detail::lvalue_preserver(expr,0)
+  
+#else
+  
+# define BOOST_LVALUE_PRESERVER(expr) expr
+  
+#endif 
+
+  // Guts of is_lvalue_iterator.  Value is the iterator's value_type
+  // and the result is computed in the nested rebind template.
+  template <class Value>
+  struct is_lvalue_iterator_impl
+  {
+      // Eat implicit conversions so we don't report true for things
+      // convertible to Value const&
+      struct conversion_eater
+      {
+          conversion_eater(Value&);
+      };
+
+      static char tester(conversion_eater, int);
+      static char (& tester(any_conversion_eater, ...) )[2];
+    
+      template <class It>
+      struct rebind
+      {
+          static It& x;
+          
+          BOOST_STATIC_CONSTANT(
+              bool
+            , value = (
+                sizeof(
+                    is_lvalue_iterator_impl<Value>::tester(
+                        BOOST_LVALUE_PRESERVER(*x), 0
+                    )
+                ) == 1
+            )
+          );
+      };
+  };
+
+#undef BOOST_LVALUE_PRESERVER
+  
+  //
+  // void specializations to handle std input and output iterators
+  //
+  template <>
+  struct is_lvalue_iterator_impl<void>
+  {
+      template <class It>
+      struct rebind : boost::mpl::false_
+      {};
+  };
+
+#ifndef BOOST_NO_CV_VOID_SPECIALIZATIONS
+  template <>
+  struct is_lvalue_iterator_impl<const void>
+  {
+      template <class It>
+      struct rebind : boost::mpl::false_
+      {};
+  };
+
+  template <>
+  struct is_lvalue_iterator_impl<volatile void>
+  {
+      template <class It>
+      struct rebind : boost::mpl::false_
+      {};
+  };
+
+  template <>
+  struct is_lvalue_iterator_impl<const volatile void>
+  {
+      template <class It>
+      struct rebind : boost::mpl::false_
+      {};
+  };
+#endif
+
+  //
+  // This level of dispatching is required for Borland.  We might save
+  // an instantiation by removing it for others.
+  //
+  template <class It>
+  struct is_readable_lvalue_iterator_impl
+    : is_lvalue_iterator_impl<
+          BOOST_DEDUCED_TYPENAME boost::detail::iterator_traits<It>::value_type const
+      >::template rebind<It>
+  {};
+
+  template <class It>
+  struct is_non_const_lvalue_iterator_impl
+    : is_lvalue_iterator_impl<
+          BOOST_DEDUCED_TYPENAME boost::detail::iterator_traits<It>::value_type
+      >::template rebind<It>
+  {};
+} // namespace detail
+
+// Define the trait with full mpl lambda capability and various broken
+// compiler workarounds
+BOOST_TT_AUX_BOOL_TRAIT_DEF1(
+    is_lvalue_iterator,T,::boost::detail::is_readable_lvalue_iterator_impl<T>::value)
+    
+BOOST_TT_AUX_BOOL_TRAIT_DEF1(
+    is_non_const_lvalue_iterator,T,::boost::detail::is_non_const_lvalue_iterator_impl<T>::value)
+    
+} // namespace boost
+
+#endif
+
+#include <boost/iterator/detail/config_undef.hpp>
+#include <boost/type_traits/detail/bool_trait_undef.hpp>
+
+#endif // IS_LVALUE_ITERATOR_DWA2003112_HPP
diff --git a/ext/boost/iterator/is_readable_iterator.hpp b/ext/boost/iterator/is_readable_iterator.hpp
new file mode 100644
index 0000000000..60d6ff07f5
--- /dev/null
+++ b/ext/boost/iterator/is_readable_iterator.hpp
@@ -0,0 +1,108 @@
+// Copyright David Abrahams 2003. Use, modification and distribution is
+// subject to the Boost Software License, Version 1.0. (See accompanying
+// file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
+#ifndef IS_READABLE_ITERATOR_DWA2003112_HPP
+# define IS_READABLE_ITERATOR_DWA2003112_HPP
+
+#include <boost/mpl/bool.hpp>
+#include <boost/detail/iterator.hpp>
+
+#include <boost/type_traits/detail/bool_trait_def.hpp>
+#include <boost/iterator/detail/any_conversion_eater.hpp>
+
+// should be the last #include
+#include <boost/iterator/detail/config_def.hpp>
+
+#ifndef BOOST_NO_IS_CONVERTIBLE
+
+namespace boost {
+ 
+namespace detail
+{
+  // Guts of is_readable_iterator.  Value is the iterator's value_type
+  // and the result is computed in the nested rebind template.
+  template <class Value>
+  struct is_readable_iterator_impl
+  {
+      static char tester(Value&, int);
+      static char (& tester(any_conversion_eater, ...) )[2];
+    
+      template <class It>
+      struct rebind
+      {
+          static It& x;
+          
+          BOOST_STATIC_CONSTANT(
+              bool
+            , value = (
+                sizeof(
+                    is_readable_iterator_impl<Value>::tester(*x, 1)
+                ) == 1
+            )
+          );
+      };
+  };
+
+#undef BOOST_READABLE_PRESERVER
+  
+  //
+  // void specializations to handle std input and output iterators
+  //
+  template <>
+  struct is_readable_iterator_impl<void>
+  {
+      template <class It>
+      struct rebind : boost::mpl::false_
+      {};
+  };
+
+#ifndef BOOST_NO_CV_VOID_SPECIALIZATIONS
+  template <>
+  struct is_readable_iterator_impl<const void>
+  {
+      template <class It>
+      struct rebind : boost::mpl::false_
+      {};
+  };
+
+  template <>
+  struct is_readable_iterator_impl<volatile void>
+  {
+      template <class It>
+      struct rebind : boost::mpl::false_
+      {};
+  };
+
+  template <>
+  struct is_readable_iterator_impl<const volatile void>
+  {
+      template <class It>
+      struct rebind : boost::mpl::false_
+      {};
+  };
+#endif
+
+  //
+  // This level of dispatching is required for Borland.  We might save
+  // an instantiation by removing it for others.
+  //
+  template <class It>
+  struct is_readable_iterator_impl2
+    : is_readable_iterator_impl<
+          BOOST_DEDUCED_TYPENAME boost::detail::iterator_traits<It>::value_type const
+      >::template rebind<It>
+  {};
+} // namespace detail
+
+// Define the trait with full mpl lambda capability and various broken
+// compiler workarounds
+BOOST_TT_AUX_BOOL_TRAIT_DEF1(
+    is_readable_iterator,T,::boost::detail::is_readable_iterator_impl2<T>::value)
+    
+} // namespace boost
+
+#endif
+
+#include <boost/iterator/detail/config_undef.hpp>
+
+#endif // IS_READABLE_ITERATOR_DWA2003112_HPP
diff --git a/ext/boost/iterator/iterator_adaptor.hpp b/ext/boost/iterator/iterator_adaptor.hpp
new file mode 100644
index 0000000000..27b08ff018
--- /dev/null
+++ b/ext/boost/iterator/iterator_adaptor.hpp
@@ -0,0 +1,371 @@
+// (C) Copyright David Abrahams 2002.
+// (C) Copyright Jeremy Siek    2002.
+// (C) Copyright Thomas Witt    2002.
+// Distributed under the Boost Software License, Version 1.0. (See
+// accompanying file LICENSE_1_0.txt or copy at
+// http://www.boost.org/LICENSE_1_0.txt)
+#ifndef BOOST_ITERATOR_ADAPTOR_23022003THW_HPP
+#define BOOST_ITERATOR_ADAPTOR_23022003THW_HPP
+
+#include <boost/static_assert.hpp>
+#include <boost/iterator.hpp>
+#include <boost/detail/iterator.hpp>
+
+#include <boost/iterator/iterator_categories.hpp>
+#include <boost/iterator/iterator_facade.hpp>
+#include <boost/iterator/detail/enable_if.hpp>
+
+#include <boost/mpl/and.hpp>
+#include <boost/mpl/not.hpp>
+#include <boost/mpl/or.hpp>
+
+#include <boost/type_traits/is_same.hpp>
+#include <boost/type_traits/is_convertible.hpp>
+
+#ifdef BOOST_ITERATOR_REF_CONSTNESS_KILLS_WRITABILITY
+# include <boost/type_traits/remove_reference.hpp>
+
+# if BOOST_WORKAROUND(__CODEGEARC__, BOOST_TESTED_AT(0x610))
+#   include <boost/type_traits/add_reference.hpp>
+# endif
+
+#else
+# include <boost/type_traits/add_reference.hpp>
+#endif
+
+#include <boost/iterator/detail/config_def.hpp>
+
+#include <boost/iterator/iterator_traits.hpp>
+
+namespace boost
+{
+  // Used as a default template argument internally, merely to
+  // indicate "use the default", this can also be passed by users
+  // explicitly in order to specify that the default should be used.
+  struct use_default;
+  
+# ifndef BOOST_NO_TEMPLATE_PARTIAL_SPECIALIZATION
+  // the incompleteness of use_default causes massive problems for
+  // is_convertible (naturally).  This workaround is fortunately not
+  // needed for vc6/vc7.
+  template<class To>
+  struct is_convertible<use_default,To>
+    : mpl::false_ {};
+# endif 
+  
+  namespace detail
+  {
+
+    // 
+    // Result type used in enable_if_convertible meta function.
+    // This can be an incomplete type, as only pointers to 
+    // enable_if_convertible< ... >::type are used.
+    // We could have used void for this, but conversion to
+    // void* is just to easy.
+    //
+    struct enable_type;
+  }
+
+
+  //
+  // enable_if for use in adapted iterators constructors.
+  //
+  // In order to provide interoperability between adapted constant and
+  // mutable iterators, adapted iterators will usually provide templated
+  // conversion constructors of the following form
+  //
+  // template <class BaseIterator>
+  // class adapted_iterator :
+  //   public iterator_adaptor< adapted_iterator<Iterator>, Iterator >
+  // {
+  // public:
+  //   
+  //   ...
+  //
+  //   template <class OtherIterator>
+  //   adapted_iterator(
+  //       OtherIterator const& it
+  //     , typename enable_if_convertible<OtherIterator, Iterator>::type* = 0);
+  //
+  //   ...
+  // };
+  //
+  // enable_if_convertible is used to remove those overloads from the overload
+  // set that cannot be instantiated. For all practical purposes only overloads
+  // for constant/mutable interaction will remain. This has the advantage that
+  // meta functions like boost::is_convertible do not return false positives,
+  // as they can only look at the signature of the conversion constructor
+  // and not at the actual instantiation.
+  //
+  // enable_if_interoperable can be safely used in user code. It falls back to
+  // always enabled for compilers that don't support enable_if or is_convertible. 
+  // There is no need for compiler specific workarounds in user code. 
+  //
+  // The operators implementation relies on boost::is_convertible not returning
+  // false positives for user/library defined iterator types. See comments
+  // on operator implementation for consequences.
+  //
+#  if BOOST_WORKAROUND(BOOST_MSVC, <= 1300)
+  
+  template<typename From, typename To>
+  struct enable_if_convertible
+  {
+     typedef typename mpl::if_<
+         mpl::or_<
+             is_same<From,To>
+           , is_convertible<From, To>
+         >
+      , boost::detail::enable_type
+      , int&
+     >::type type;
+  };
+  
+#  elif defined(BOOST_NO_IS_CONVERTIBLE) || defined(BOOST_NO_SFINAE)
+  
+  template <class From, class To>
+  struct enable_if_convertible
+  {
+      typedef boost::detail::enable_type type;
+  };
+  
+#  elif BOOST_WORKAROUND(_MSC_FULL_VER, BOOST_TESTED_AT(13102292)) && BOOST_MSVC > 1300
+  
+  // For some reason vc7.1 needs us to "cut off" instantiation
+  // of is_convertible in a few cases.
+  template<typename From, typename To>
+  struct enable_if_convertible
+    : iterators::enable_if<
+        mpl::or_<
+            is_same<From,To>
+          , is_convertible<From, To>
+        >
+      , boost::detail::enable_type
+    >
+  {};
+  
+#  else 
+  
+  template<typename From, typename To>
+  struct enable_if_convertible
+    : iterators::enable_if<
+          is_convertible<From, To>
+        , boost::detail::enable_type
+      >
+  {};
+      
+# endif
+  
+  //
+  // Default template argument handling for iterator_adaptor
+  //
+  namespace detail
+  {
+    // If T is use_default, return the result of invoking
+    // DefaultNullaryFn, otherwise return T.
+    template <class T, class DefaultNullaryFn>
+    struct ia_dflt_help
+      : mpl::eval_if<
+            is_same<T, use_default>
+          , DefaultNullaryFn
+          , mpl::identity<T>
+        >
+    {
+    };
+
+    // A metafunction which computes an iterator_adaptor's base class,
+    // a specialization of iterator_facade.
+    template <
+        class Derived
+      , class Base
+      , class Value
+      , class Traversal
+      , class Reference
+      , class Difference
+    >
+    struct iterator_adaptor_base
+    {
+        typedef iterator_facade<
+            Derived
+            
+# ifdef BOOST_ITERATOR_REF_CONSTNESS_KILLS_WRITABILITY
+          , typename boost::detail::ia_dflt_help<
+                Value
+              , mpl::eval_if<
+                    is_same<Reference,use_default>
+                  , iterator_value<Base>
+                  , remove_reference<Reference>
+                >
+            >::type
+# else
+          , typename boost::detail::ia_dflt_help<
+                Value, iterator_value<Base>
+            >::type
+# endif
+            
+          , typename boost::detail::ia_dflt_help<
+                Traversal
+              , iterator_traversal<Base>
+            >::type
+
+          , typename boost::detail::ia_dflt_help<
+                Reference
+              , mpl::eval_if<
+                    is_same<Value,use_default>
+                  , iterator_reference<Base>
+                  , add_reference<Value>
+                >
+            >::type
+
+          , typename boost::detail::ia_dflt_help<
+                Difference, iterator_difference<Base>
+            >::type
+        >
+        type;
+    };
+  
+    // workaround for aC++ CR JAGaf33512
+    template <class Tr1, class Tr2>
+    inline void iterator_adaptor_assert_traversal ()
+    {
+      BOOST_STATIC_ASSERT((is_convertible<Tr1, Tr2>::value));
+    }
+  }
+  
+  //
+  // Iterator Adaptor
+  //
+  // The parameter ordering changed slightly with respect to former
+  // versions of iterator_adaptor The idea is that when the user needs
+  // to fiddle with the reference type it is highly likely that the
+  // iterator category has to be adjusted as well.  Any of the
+  // following four template arguments may be ommitted or explicitly
+  // replaced by use_default.
+  //
+  //   Value - if supplied, the value_type of the resulting iterator, unless
+  //      const. If const, a conforming compiler strips constness for the
+  //      value_type. If not supplied, iterator_traits<Base>::value_type is used
+  //
+  //   Category - the traversal category of the resulting iterator. If not
+  //      supplied, iterator_traversal<Base>::type is used.
+  //
+  //   Reference - the reference type of the resulting iterator, and in
+  //      particular, the result type of operator*(). If not supplied but
+  //      Value is supplied, Value& is used. Otherwise
+  //      iterator_traits<Base>::reference is used.
+  //
+  //   Difference - the difference_type of the resulting iterator. If not
+  //      supplied, iterator_traits<Base>::difference_type is used.
+  //
+  template <
+      class Derived
+    , class Base
+    , class Value        = use_default
+    , class Traversal    = use_default
+    , class Reference    = use_default
+    , class Difference   = use_default
+  >
+  class iterator_adaptor
+    : public boost::detail::iterator_adaptor_base<
+        Derived, Base, Value, Traversal, Reference, Difference
+      >::type
+  {
+      friend class iterator_core_access;
+
+   protected:
+      typedef typename boost::detail::iterator_adaptor_base<
+          Derived, Base, Value, Traversal, Reference, Difference
+      >::type super_t;
+   public:
+      iterator_adaptor() {}
+
+      explicit iterator_adaptor(Base const &iter)
+          : m_iterator(iter)
+      {
+      }
+
+      typedef Base base_type;
+
+      Base const& base() const
+        { return m_iterator; }
+
+   protected:
+      // for convenience in derived classes
+      typedef iterator_adaptor<Derived,Base,Value,Traversal,Reference,Difference> iterator_adaptor_;
+      
+      //
+      // lvalue access to the Base object for Derived
+      //
+      Base const& base_reference() const
+        { return m_iterator; }
+
+      Base& base_reference()
+        { return m_iterator; }
+
+   private:
+      //
+      // Core iterator interface for iterator_facade.  This is private
+      // to prevent temptation for Derived classes to use it, which
+      // will often result in an error.  Derived classes should use
+      // base_reference(), above, to get direct access to m_iterator.
+      // 
+      typename super_t::reference dereference() const
+        { return *m_iterator; }
+
+      template <
+      class OtherDerived, class OtherIterator, class V, class C, class R, class D
+      >   
+      bool equal(iterator_adaptor<OtherDerived, OtherIterator, V, C, R, D> const& x) const
+      {
+        // Maybe readd with same_distance
+        //           BOOST_STATIC_ASSERT(
+        //               (detail::same_category_and_difference<Derived,OtherDerived>::value)
+        //               );
+          return m_iterator == x.base();
+      }
+
+      typedef typename iterator_category_to_traversal<
+          typename super_t::iterator_category
+      >::type my_traversal;
+
+# define BOOST_ITERATOR_ADAPTOR_ASSERT_TRAVERSAL(cat) \
+      boost::detail::iterator_adaptor_assert_traversal<my_traversal, cat>();
+
+      void advance(typename super_t::difference_type n)
+      {
+          BOOST_ITERATOR_ADAPTOR_ASSERT_TRAVERSAL(random_access_traversal_tag)
+          m_iterator += n;
+      }
+  
+      void increment() { ++m_iterator; }
+
+      void decrement() 
+      {
+          BOOST_ITERATOR_ADAPTOR_ASSERT_TRAVERSAL(bidirectional_traversal_tag)
+           --m_iterator;
+      }
+
+      template <
+          class OtherDerived, class OtherIterator, class V, class C, class R, class D
+      >   
+      typename super_t::difference_type distance_to(
+          iterator_adaptor<OtherDerived, OtherIterator, V, C, R, D> const& y) const
+      {
+          BOOST_ITERATOR_ADAPTOR_ASSERT_TRAVERSAL(random_access_traversal_tag)
+          // Maybe readd with same_distance
+          //           BOOST_STATIC_ASSERT(
+          //               (detail::same_category_and_difference<Derived,OtherDerived>::value)
+          //               );
+          return y.base() - m_iterator;
+      }
+
+# undef BOOST_ITERATOR_ADAPTOR_ASSERT_TRAVERSAL
+      
+   private: // data members
+      Base m_iterator;
+  };
+
+} // namespace boost
+
+#include <boost/iterator/detail/config_undef.hpp>
+
+#endif // BOOST_ITERATOR_ADAPTOR_23022003THW_HPP
diff --git a/ext/boost/iterator/iterator_archetypes.hpp b/ext/boost/iterator/iterator_archetypes.hpp
new file mode 100644
index 0000000000..039de1cf74
--- /dev/null
+++ b/ext/boost/iterator/iterator_archetypes.hpp
@@ -0,0 +1,515 @@
+// (C) Copyright Jeremy Siek 2002.
+// Distributed under the Boost Software License, Version 1.0. (See
+// accompanying file LICENSE_1_0.txt or copy at
+// http://www.boost.org/LICENSE_1_0.txt)
+
+#ifndef BOOST_ITERATOR_ARCHETYPES_HPP
+#define BOOST_ITERATOR_ARCHETYPES_HPP
+
+#include <boost/iterator/iterator_categories.hpp>
+#include <boost/operators.hpp>
+#include <boost/static_assert.hpp>
+#include <boost/iterator.hpp>
+
+#include <boost/iterator/detail/facade_iterator_category.hpp>
+
+#include <boost/type_traits/is_const.hpp>
+#include <boost/type_traits/add_const.hpp>
+#include <boost/type_traits/remove_const.hpp>
+#include <boost/type_traits/remove_cv.hpp>
+
+#include <boost/concept_archetype.hpp>
+
+#include <boost/mpl/aux_/msvc_eti_base.hpp>
+#include <boost/mpl/bitand.hpp>
+#include <boost/mpl/int.hpp>
+#include <boost/mpl/equal_to.hpp>
+#include <boost/mpl/if.hpp>
+#include <boost/mpl/eval_if.hpp>
+#include <boost/mpl/and.hpp>
+#include <boost/mpl/identity.hpp>
+
+#include <cstddef>
+
+namespace boost {
+
+template <class Value, class AccessCategory>
+struct access_archetype;
+
+template <class Derived, class Value, class AccessCategory, class TraversalCategory>
+struct traversal_archetype;
+
+namespace iterator_archetypes
+{
+  enum {
+      readable_iterator_bit = 1
+    , writable_iterator_bit = 2
+    , swappable_iterator_bit = 4
+    , lvalue_iterator_bit = 8
+  };
+
+  // Not quite tags, since dispatching wouldn't work.
+  typedef mpl::int_<readable_iterator_bit>::type readable_iterator_t;
+  typedef mpl::int_<writable_iterator_bit>::type writable_iterator_t;
+  
+  typedef mpl::int_<
+      (readable_iterator_bit|writable_iterator_bit)
+          >::type readable_writable_iterator_t;
+  
+  typedef mpl::int_<
+      (readable_iterator_bit|lvalue_iterator_bit)
+          >::type readable_lvalue_iterator_t;
+  
+  typedef mpl::int_<
+      (lvalue_iterator_bit|writable_iterator_bit)
+          >::type writable_lvalue_iterator_t;
+  
+  typedef mpl::int_<swappable_iterator_bit>::type swappable_iterator_t;
+  typedef mpl::int_<lvalue_iterator_bit>::type lvalue_iterator_t;
+
+  template <class Derived, class Base>
+  struct has_access
+    : mpl::equal_to<
+          mpl::bitand_<Derived,Base>
+        , Base
+      >
+  {};
+}
+
+namespace detail
+{
+  template <class T>
+  struct assign_proxy
+  {
+      assign_proxy& operator=(T) { return *this; }
+  };
+
+  template <class T>
+  struct read_proxy
+  {
+      operator T() { return static_object<T>::get(); }
+  };
+
+  template <class T>
+  struct read_write_proxy
+    : read_proxy<T> // Use to inherit from assign_proxy, but that doesn't work. -JGS
+  {
+      read_write_proxy& operator=(T) { return *this; }
+  };
+
+  template <class T>
+  struct arrow_proxy
+  {
+      T const* operator->() const { return 0; }
+  };
+
+  struct no_operator_brackets {};
+
+  template <class ValueType>
+  struct readable_operator_brackets
+  {
+      read_proxy<ValueType> operator[](std::ptrdiff_t n) const { return read_proxy<ValueType>(); }
+  };
+
+  template <class ValueType>
+  struct writable_operator_brackets
+  {
+      read_write_proxy<ValueType> operator[](std::ptrdiff_t n) const { return read_write_proxy<ValueType>(); }
+  };
+
+  template <class Value, class AccessCategory, class TraversalCategory>
+  struct operator_brackets
+    : mpl::aux::msvc_eti_base<
+          typename mpl::eval_if<
+              is_convertible<TraversalCategory, random_access_traversal_tag>
+            , mpl::eval_if<
+                  iterator_archetypes::has_access<
+                      AccessCategory
+                    , iterator_archetypes::writable_iterator_t
+                  >
+                , mpl::identity<writable_operator_brackets<Value> >
+                , mpl::if_<
+                      iterator_archetypes::has_access<
+                          AccessCategory
+                        , iterator_archetypes::readable_iterator_t
+                      >
+                    , readable_operator_brackets<Value>
+                    , no_operator_brackets
+                  >
+              >
+            , mpl::identity<no_operator_brackets>
+          >::type
+      >::type
+  {};
+  
+  template <class TraversalCategory>
+  struct traversal_archetype_impl
+  {
+      template <class Derived,class Value> struct archetype;
+  };
+
+  // Constructor argument for those iterators that
+  // are not default constructible
+  struct ctor_arg {};
+
+  template <class Derived, class Value, class TraversalCategory>
+  struct traversal_archetype_
+    : mpl::aux::msvc_eti_base<
+          typename traversal_archetype_impl<TraversalCategory>::template archetype<Derived,Value>
+      >::type
+  {
+      typedef typename
+        traversal_archetype_impl<TraversalCategory>::template archetype<Derived,Value>
+      base;
+      
+      traversal_archetype_() {}
+
+      traversal_archetype_(ctor_arg arg)
+        : base(arg) 
+      {}
+  };
+
+  template <>
+  struct traversal_archetype_impl<incrementable_traversal_tag>
+  {
+      template<class Derived, class Value>
+      struct archetype
+      {
+          explicit archetype(ctor_arg) {}
+
+          struct bogus { }; // This use to be void, but that causes trouble for iterator_facade. Need more research. -JGS
+          typedef bogus difference_type;
+
+          Derived& operator++() { return (Derived&)static_object<Derived>::get(); }
+          Derived  operator++(int) const { return (Derived&)static_object<Derived>::get(); }
+      };
+  };
+
+  template <>
+  struct traversal_archetype_impl<single_pass_traversal_tag>
+  {
+      template<class Derived, class Value>
+      struct archetype
+        : public equality_comparable< traversal_archetype_<Derived, Value, single_pass_traversal_tag> >,
+          public traversal_archetype_<Derived, Value, incrementable_traversal_tag>
+      {
+          explicit archetype(ctor_arg arg)
+            : traversal_archetype_<Derived, Value, incrementable_traversal_tag>(arg)
+          {}
+          
+          typedef std::ptrdiff_t difference_type;
+      };
+  };
+
+  template <class Derived, class Value>
+  bool operator==(traversal_archetype_<Derived, Value, single_pass_traversal_tag> const&,
+                  traversal_archetype_<Derived, Value, single_pass_traversal_tag> const&) { return true; }
+  
+#if BOOST_WORKAROUND(BOOST_MSVC, <= 1300)
+  // doesn't seem to pick up != from equality_comparable
+  template <class Derived, class Value>
+  bool operator!=(traversal_archetype_<Derived, Value, single_pass_traversal_tag> const&,
+                  traversal_archetype_<Derived, Value, single_pass_traversal_tag> const&) { return true; }
+#endif 
+  template <>
+  struct traversal_archetype_impl<forward_traversal_tag>
+  {
+      template<class Derived, class Value>
+      struct archetype
+        : public traversal_archetype_<Derived, Value, single_pass_traversal_tag>
+      {
+          archetype() 
+            : traversal_archetype_<Derived, Value, single_pass_traversal_tag>(ctor_arg())
+          {}
+      };
+  };
+
+  template <>
+  struct traversal_archetype_impl<bidirectional_traversal_tag>
+  {
+      template<class Derived, class Value>
+      struct archetype
+        : public traversal_archetype_<Derived, Value, forward_traversal_tag>
+      {
+          Derived& operator--() { return static_object<Derived>::get(); }
+          Derived  operator--(int) const { return static_object<Derived>::get(); }
+      };
+  };
+
+  template <>
+  struct traversal_archetype_impl<random_access_traversal_tag>
+  {
+      template<class Derived, class Value>
+      struct archetype
+        : public traversal_archetype_<Derived, Value, bidirectional_traversal_tag> 
+      {
+          Derived& operator+=(std::ptrdiff_t) { return static_object<Derived>::get(); }
+          Derived& operator-=(std::ptrdiff_t) { return static_object<Derived>::get(); }
+      };
+  };
+
+  template <class Derived, class Value>
+  Derived& operator+(traversal_archetype_<Derived, Value, random_access_traversal_tag> const&,
+                     std::ptrdiff_t) { return static_object<Derived>::get(); }
+
+  template <class Derived, class Value>
+  Derived& operator+(std::ptrdiff_t,
+                     traversal_archetype_<Derived, Value, random_access_traversal_tag> const&)
+      { return static_object<Derived>::get(); }
+
+  template <class Derived, class Value>
+  Derived& operator-(traversal_archetype_<Derived, Value, random_access_traversal_tag> const&,
+                     std::ptrdiff_t)
+      { return static_object<Derived>::get(); }
+
+  template <class Derived, class Value>
+  std::ptrdiff_t operator-(traversal_archetype_<Derived, Value, random_access_traversal_tag> const&,
+                           traversal_archetype_<Derived, Value, random_access_traversal_tag> const&)
+      { return 0; }
+
+  template <class Derived, class Value>
+  bool operator<(traversal_archetype_<Derived, Value, random_access_traversal_tag> const&,
+                 traversal_archetype_<Derived, Value, random_access_traversal_tag> const&)
+      { return true; }
+
+  template <class Derived, class Value>
+  bool operator>(traversal_archetype_<Derived, Value, random_access_traversal_tag> const&,
+                 traversal_archetype_<Derived, Value, random_access_traversal_tag> const&)
+      { return true; }
+
+  template <class Derived, class Value>
+  bool operator<=(traversal_archetype_<Derived, Value, random_access_traversal_tag> const&,
+                 traversal_archetype_<Derived, Value, random_access_traversal_tag> const&)
+      { return true; }
+
+  template <class Derived, class Value>
+  bool operator>=(traversal_archetype_<Derived, Value, random_access_traversal_tag> const&,
+                 traversal_archetype_<Derived, Value, random_access_traversal_tag> const&)
+      { return true; }
+
+  struct bogus_type;
+
+  template <class Value>
+  struct convertible_type
+    : mpl::if_< is_const<Value>,
+                typename remove_const<Value>::type,
+                bogus_type >
+  {};
+
+} // namespace detail
+
+
+template <class> struct undefined;
+  
+template <class AccessCategory>
+struct iterator_access_archetype_impl
+{
+    template <class Value> struct archetype;
+};
+
+template <class Value, class AccessCategory>
+struct iterator_access_archetype
+  : mpl::aux::msvc_eti_base<
+        typename iterator_access_archetype_impl<
+            AccessCategory
+        >::template archetype<Value>
+    >::type
+{
+};
+
+template <>
+struct iterator_access_archetype_impl<
+    iterator_archetypes::readable_iterator_t
+>
+{
+    template <class Value>
+    struct archetype
+    {
+        typedef typename remove_cv<Value>::type value_type;
+        typedef Value                           reference;
+        typedef Value*                          pointer;
+
+        value_type operator*() const { return static_object<value_type>::get(); }
+
+        detail::arrow_proxy<Value> operator->() const { return detail::arrow_proxy<Value>(); }
+    };
+};
+
+template <>
+struct iterator_access_archetype_impl<
+    iterator_archetypes::writable_iterator_t
+>
+{
+    template <class Value>
+    struct archetype
+    {
+# if !BOOST_WORKAROUND(BOOST_MSVC, <= 1300)
+        BOOST_STATIC_ASSERT(!is_const<Value>::value);
+# endif 
+        typedef void value_type;
+        typedef void reference;
+        typedef void pointer;
+
+        detail::assign_proxy<Value> operator*() const { return detail::assign_proxy<Value>(); }
+    };
+};
+
+template <>
+struct iterator_access_archetype_impl<
+    iterator_archetypes::readable_writable_iterator_t
+>
+{
+    template <class Value>
+    struct archetype
+      : public virtual iterator_access_archetype<
+            Value, iterator_archetypes::readable_iterator_t
+        >
+    {
+        typedef detail::read_write_proxy<Value>    reference;
+
+        detail::read_write_proxy<Value> operator*() const { return detail::read_write_proxy<Value>(); }
+    };
+};
+
+template <>
+struct iterator_access_archetype_impl<iterator_archetypes::readable_lvalue_iterator_t>
+{
+    template <class Value>
+    struct archetype
+      : public virtual iterator_access_archetype<
+            Value, iterator_archetypes::readable_iterator_t
+        >
+    {
+        typedef Value&    reference;
+
+        Value& operator*() const { return static_object<Value>::get(); }
+        Value* operator->() const { return 0; }
+    };
+};
+  
+template <>
+struct iterator_access_archetype_impl<iterator_archetypes::writable_lvalue_iterator_t>
+{
+    template <class Value>
+    struct archetype
+      : public virtual iterator_access_archetype<
+            Value, iterator_archetypes::readable_lvalue_iterator_t
+        >
+    {
+# if !BOOST_WORKAROUND(BOOST_MSVC, <= 1300)
+        BOOST_STATIC_ASSERT((!is_const<Value>::value));
+# endif 
+    };
+};
+  
+
+template <class Value, class AccessCategory, class TraversalCategory>
+struct iterator_archetype;
+  
+template <class Value, class AccessCategory, class TraversalCategory>
+struct traversal_archetype_base 
+  : detail::operator_brackets<
+        typename remove_cv<Value>::type
+      , AccessCategory
+      , TraversalCategory
+    >
+  , detail::traversal_archetype_<
+        iterator_archetype<Value, AccessCategory, TraversalCategory>
+      , Value
+      , TraversalCategory
+    >
+{
+};
+
+namespace detail
+{
+  template <class Value, class AccessCategory, class TraversalCategory>
+  struct iterator_archetype_base
+    : iterator_access_archetype<Value, AccessCategory>
+    , traversal_archetype_base<Value, AccessCategory, TraversalCategory>
+  {
+      typedef iterator_access_archetype<Value, AccessCategory> access;
+      
+      typedef typename detail::facade_iterator_category<
+          TraversalCategory
+        , typename mpl::eval_if<
+              iterator_archetypes::has_access<
+                  AccessCategory, iterator_archetypes::writable_iterator_t
+              >
+            , remove_const<Value>
+            , add_const<Value>
+          >::type
+        , typename access::reference
+      >::type iterator_category;
+
+      // Needed for some broken libraries (see below)
+      typedef boost::iterator<
+          iterator_category
+        , Value
+        , typename traversal_archetype_base<
+              Value, AccessCategory, TraversalCategory
+          >::difference_type
+        , typename access::pointer
+        , typename access::reference
+      > workaround_iterator_base;
+  };
+}
+
+template <class Value, class AccessCategory, class TraversalCategory>
+struct iterator_archetype
+  : public detail::iterator_archetype_base<Value, AccessCategory, TraversalCategory>
+
+    // These broken libraries require derivation from std::iterator
+    // (or related magic) in order to handle iter_swap and other
+    // iterator operations
+# if BOOST_WORKAROUND(BOOST_DINKUMWARE_STDLIB, < 310)           \
+    || BOOST_WORKAROUND(_RWSTD_VER, BOOST_TESTED_AT(0x20101))
+  , public detail::iterator_archetype_base<
+        Value, AccessCategory, TraversalCategory
+    >::workaround_iterator_base
+# endif 
+{
+    // Derivation from std::iterator above caused references to nested
+    // types to be ambiguous, so now we have to redeclare them all
+    // here.
+# if BOOST_WORKAROUND(BOOST_DINKUMWARE_STDLIB, < 310)           \
+    || BOOST_WORKAROUND(_RWSTD_VER, BOOST_TESTED_AT(0x20101))
+    
+    typedef detail::iterator_archetype_base<
+        Value,AccessCategory,TraversalCategory
+    > base;
+    
+    typedef typename base::value_type value_type;
+    typedef typename base::reference reference;
+    typedef typename base::pointer pointer;
+    typedef typename base::difference_type difference_type;
+    typedef typename base::iterator_category iterator_category;
+# endif
+
+    iterator_archetype() { }
+    iterator_archetype(iterator_archetype const& x)
+      : detail::iterator_archetype_base<
+            Value
+          , AccessCategory
+          , TraversalCategory
+        >(x)
+    {}
+
+    iterator_archetype& operator=(iterator_archetype const&)
+        { return *this; }
+
+# if 0
+    // Optional conversion from mutable
+    iterator_archetype(
+        iterator_archetype<
+        typename detail::convertible_type<Value>::type
+      , AccessCategory
+      , TraversalCategory> const&
+    );
+# endif
+};
+
+} // namespace boost
+
+
+#endif // BOOST_ITERATOR_ARCHETYPES_HPP
diff --git a/ext/boost/iterator/iterator_categories.hpp b/ext/boost/iterator/iterator_categories.hpp
new file mode 100644
index 0000000000..1740d9818a
--- /dev/null
+++ b/ext/boost/iterator/iterator_categories.hpp
@@ -0,0 +1,188 @@
+// (C) Copyright Jeremy Siek 2002.
+// Distributed under the Boost Software License, Version 1.0. (See
+// accompanying file LICENSE_1_0.txt or copy at
+// http://www.boost.org/LICENSE_1_0.txt)
+
+#ifndef BOOST_ITERATOR_CATEGORIES_HPP
+# define BOOST_ITERATOR_CATEGORIES_HPP
+
+# include <boost/config.hpp>
+# include <boost/detail/iterator.hpp>
+# include <boost/iterator/detail/config_def.hpp>
+
+# include <boost/detail/workaround.hpp>
+
+# include <boost/mpl/eval_if.hpp>
+# include <boost/mpl/identity.hpp>
+# include <boost/mpl/placeholders.hpp>
+# include <boost/mpl/aux_/lambda_support.hpp>
+
+# include <boost/type_traits/is_convertible.hpp>
+
+# include <boost/static_assert.hpp>
+
+namespace boost {
+
+//
+// Traversal Categories
+//
+
+struct no_traversal_tag {};
+
+struct incrementable_traversal_tag 
+  : no_traversal_tag
+{
+//     incrementable_traversal_tag() {}
+//     incrementable_traversal_tag(std::output_iterator_tag const&) {};
+};
+  
+struct single_pass_traversal_tag
+  : incrementable_traversal_tag
+{
+//     single_pass_traversal_tag() {}
+//     single_pass_traversal_tag(std::input_iterator_tag const&) {};
+};
+  
+struct forward_traversal_tag
+  : single_pass_traversal_tag
+{
+//     forward_traversal_tag() {}
+//     forward_traversal_tag(std::forward_iterator_tag const&) {};
+};
+  
+struct bidirectional_traversal_tag
+  : forward_traversal_tag
+{
+//     bidirectional_traversal_tag() {};
+//     bidirectional_traversal_tag(std::bidirectional_iterator_tag const&) {};
+};
+  
+struct random_access_traversal_tag
+  : bidirectional_traversal_tag
+{
+//     random_access_traversal_tag() {};
+//     random_access_traversal_tag(std::random_access_iterator_tag const&) {};
+};
+
+namespace detail
+{  
+  //
+  // Convert a "strictly old-style" iterator category to a traversal
+  // tag.  This is broken out into a separate metafunction to reduce
+  // the cost of instantiating iterator_category_to_traversal, below,
+  // for new-style types.
+  //
+  template <class Cat>
+  struct old_category_to_traversal
+    : mpl::eval_if<
+          is_convertible<Cat,std::random_access_iterator_tag>
+        , mpl::identity<random_access_traversal_tag>
+        , mpl::eval_if<
+              is_convertible<Cat,std::bidirectional_iterator_tag>
+            , mpl::identity<bidirectional_traversal_tag>
+            , mpl::eval_if<
+                  is_convertible<Cat,std::forward_iterator_tag>
+                , mpl::identity<forward_traversal_tag>
+                , mpl::eval_if<
+                      is_convertible<Cat,std::input_iterator_tag>
+                    , mpl::identity<single_pass_traversal_tag>
+                    , mpl::eval_if<
+                          is_convertible<Cat,std::output_iterator_tag>
+                        , mpl::identity<incrementable_traversal_tag>
+                        , void
+                      >
+                  >
+              >
+          >
+      >
+  {};
+
+# if BOOST_WORKAROUND(BOOST_MSVC, < 1300)
+  template <>
+  struct old_category_to_traversal<int>
+  {
+      typedef int type;
+  };
+# endif
+
+  template <class Traversal>
+  struct pure_traversal_tag
+    : mpl::eval_if<
+          is_convertible<Traversal,random_access_traversal_tag>
+        , mpl::identity<random_access_traversal_tag>
+        , mpl::eval_if<
+              is_convertible<Traversal,bidirectional_traversal_tag>
+            , mpl::identity<bidirectional_traversal_tag>
+            , mpl::eval_if<
+                  is_convertible<Traversal,forward_traversal_tag>
+                , mpl::identity<forward_traversal_tag>
+                , mpl::eval_if<
+                      is_convertible<Traversal,single_pass_traversal_tag>
+                    , mpl::identity<single_pass_traversal_tag>
+                    , mpl::eval_if<
+                          is_convertible<Traversal,incrementable_traversal_tag>
+                        , mpl::identity<incrementable_traversal_tag>
+                        , void
+                      >
+                  >
+              >
+          >
+      >
+  {
+  };
+  
+# if BOOST_WORKAROUND(BOOST_MSVC, < 1300)
+  template <>
+  struct pure_traversal_tag<int>
+  {
+      typedef int type;
+  };
+# endif
+
+} // namespace detail
+
+
+//
+// Convert an iterator category into a traversal tag
+//
+template <class Cat>
+struct iterator_category_to_traversal
+  : mpl::eval_if< // if already convertible to a traversal tag, we're done.
+        is_convertible<Cat,incrementable_traversal_tag>
+      , mpl::identity<Cat>
+      , boost::detail::old_category_to_traversal<Cat>
+    >
+{};
+
+// Trait to get an iterator's traversal category
+template <class Iterator = mpl::_1>
+struct iterator_traversal
+  : iterator_category_to_traversal<
+        typename boost::detail::iterator_traits<Iterator>::iterator_category
+    >
+{};
+
+# ifdef BOOST_MPL_CFG_NO_FULL_LAMBDA_SUPPORT
+// Hack because BOOST_MPL_AUX_LAMBDA_SUPPORT doesn't seem to work
+// out well.  Instantiating the nested apply template also
+// requires instantiating iterator_traits on the
+// placeholder. Instead we just specialize it as a metafunction
+// class.
+template <>
+struct iterator_traversal<mpl::_1>
+{
+    template <class T>
+    struct apply : iterator_traversal<T>
+    {};
+};
+template <>
+struct iterator_traversal<mpl::_>
+  : iterator_traversal<mpl::_1>
+{};
+# endif
+
+} // namespace boost
+
+#include <boost/iterator/detail/config_undef.hpp>
+
+#endif // BOOST_ITERATOR_CATEGORIES_HPP
diff --git a/ext/boost/iterator/iterator_concepts.hpp b/ext/boost/iterator/iterator_concepts.hpp
new file mode 100644
index 0000000000..ced1112a61
--- /dev/null
+++ b/ext/boost/iterator/iterator_concepts.hpp
@@ -0,0 +1,284 @@
+// (C) Copyright Jeremy Siek 2002.
+// Distributed under the Boost Software License, Version 1.0. (See
+// accompanying file LICENSE_1_0.txt or copy at
+// http://www.boost.org/LICENSE_1_0.txt)
+
+#ifndef BOOST_ITERATOR_CONCEPTS_HPP
+#define BOOST_ITERATOR_CONCEPTS_HPP
+
+#include <boost/concept_check.hpp>
+#include <boost/iterator/iterator_categories.hpp>
+
+// Use boost::detail::iterator_traits to work around some MSVC/Dinkumware problems.
+#include <boost/detail/iterator.hpp>
+
+#include <boost/type_traits/is_same.hpp>
+#include <boost/type_traits/is_integral.hpp>
+
+#include <boost/mpl/bool.hpp>
+#include <boost/mpl/if.hpp>
+#include <boost/mpl/and.hpp>
+#include <boost/mpl/or.hpp>
+
+#include <boost/static_assert.hpp>
+
+// Use boost/limits to work around missing limits headers on some compilers
+#include <boost/limits.hpp>
+#include <boost/config.hpp>
+
+#include <algorithm>
+
+#include <boost/concept/detail/concept_def.hpp>
+
+namespace boost_concepts
+{
+  // Used a different namespace here (instead of "boost") so that the
+  // concept descriptions do not take for granted the names in
+  // namespace boost.
+
+  //===========================================================================
+  // Iterator Access Concepts
+
+  BOOST_concept(ReadableIterator,(Iterator))
+    : boost::Assignable<Iterator>
+    , boost::CopyConstructible<Iterator>
+
+  {
+      typedef BOOST_DEDUCED_TYPENAME boost::detail::iterator_traits<Iterator>::value_type value_type;
+      typedef BOOST_DEDUCED_TYPENAME boost::detail::iterator_traits<Iterator>::reference reference;
+
+      BOOST_CONCEPT_USAGE(ReadableIterator)
+      {
+
+          value_type v = *i;
+          boost::ignore_unused_variable_warning(v);
+      }
+  private:
+      Iterator i;
+  };
+  
+  template <
+      typename Iterator
+    , typename ValueType = BOOST_DEDUCED_TYPENAME boost::detail::iterator_traits<Iterator>::value_type
+  >
+  struct WritableIterator
+    : boost::CopyConstructible<Iterator>
+  {
+      BOOST_CONCEPT_USAGE(WritableIterator)
+      {
+          *i = v;
+      }
+  private:
+      ValueType v;
+      Iterator i;
+  };
+
+  template <
+      typename Iterator
+    , typename ValueType = BOOST_DEDUCED_TYPENAME boost::detail::iterator_traits<Iterator>::value_type
+  >
+  struct WritableIteratorConcept : WritableIterator<Iterator,ValueType> {};
+  
+  BOOST_concept(SwappableIterator,(Iterator))
+  {
+      BOOST_CONCEPT_USAGE(SwappableIterator)
+      {
+          std::iter_swap(i1, i2);
+      }
+  private:
+      Iterator i1;
+      Iterator i2;
+  };
+
+  BOOST_concept(LvalueIterator,(Iterator))
+  {
+      typedef typename boost::detail::iterator_traits<Iterator>::value_type value_type;
+      
+      BOOST_CONCEPT_USAGE(LvalueIterator)
+      {
+        value_type& r = const_cast<value_type&>(*i);
+        boost::ignore_unused_variable_warning(r);
+      }
+  private:
+      Iterator i;
+  };
+
+  
+  //===========================================================================
+  // Iterator Traversal Concepts
+
+  BOOST_concept(IncrementableIterator,(Iterator))
+    : boost::Assignable<Iterator>
+    , boost::CopyConstructible<Iterator>
+  {
+      typedef typename boost::iterator_traversal<Iterator>::type traversal_category;
+
+      BOOST_CONCEPT_ASSERT((
+        boost::Convertible<
+            traversal_category
+          , boost::incrementable_traversal_tag
+        >));
+
+      BOOST_CONCEPT_USAGE(IncrementableIterator)
+      {
+          ++i;
+          (void)i++;
+      }
+  private:
+      Iterator i;
+  };
+
+  BOOST_concept(SinglePassIterator,(Iterator))
+    : IncrementableIterator<Iterator>
+    , boost::EqualityComparable<Iterator>
+
+  {
+      BOOST_CONCEPT_ASSERT((
+          boost::Convertible<
+             BOOST_DEDUCED_TYPENAME SinglePassIterator::traversal_category
+           , boost::single_pass_traversal_tag
+          > ));
+  };
+
+  BOOST_concept(ForwardTraversal,(Iterator))
+    : SinglePassIterator<Iterator>
+    , boost::DefaultConstructible<Iterator>
+  {
+      typedef typename boost::detail::iterator_traits<Iterator>::difference_type difference_type;
+      
+      BOOST_MPL_ASSERT((boost::is_integral<difference_type>));
+      BOOST_MPL_ASSERT_RELATION(std::numeric_limits<difference_type>::is_signed, ==, true);
+
+      BOOST_CONCEPT_ASSERT((
+          boost::Convertible<
+             BOOST_DEDUCED_TYPENAME ForwardTraversal::traversal_category
+           , boost::forward_traversal_tag
+          > ));
+  };
+  
+  BOOST_concept(BidirectionalTraversal,(Iterator))
+    : ForwardTraversal<Iterator>
+  {
+      BOOST_CONCEPT_ASSERT((
+          boost::Convertible<
+             BOOST_DEDUCED_TYPENAME BidirectionalTraversal::traversal_category
+           , boost::bidirectional_traversal_tag
+          > ));
+
+      BOOST_CONCEPT_USAGE(BidirectionalTraversal)
+      {
+          --i;
+          (void)i--;
+      }
+   private:
+      Iterator i;
+  };
+
+  BOOST_concept(RandomAccessTraversal,(Iterator))
+    : BidirectionalTraversal<Iterator>
+  {
+      BOOST_CONCEPT_ASSERT((
+          boost::Convertible<
+             BOOST_DEDUCED_TYPENAME RandomAccessTraversal::traversal_category
+           , boost::random_access_traversal_tag
+          > ));
+
+      BOOST_CONCEPT_USAGE(RandomAccessTraversal)
+      {
+          i += n;
+          i = i + n;
+          i = n + i;
+          i -= n;
+          i = i - n;
+          n = i - j;
+      }
+      
+   private:
+      typename BidirectionalTraversal<Iterator>::difference_type n;
+      Iterator i, j;
+  };
+
+  //===========================================================================
+  // Iterator Interoperability 
+
+  namespace detail
+  {
+    template <typename Iterator1, typename Iterator2>
+    void interop_single_pass_constraints(Iterator1 const& i1, Iterator2 const& i2)
+    {
+        bool b;
+        b = i1 == i2;
+        b = i1 != i2;
+
+        b = i2 == i1;
+        b = i2 != i1;
+        boost::ignore_unused_variable_warning(b);
+    }
+
+    template <typename Iterator1, typename Iterator2>
+    void interop_rand_access_constraints(
+        Iterator1 const& i1, Iterator2 const& i2,
+        boost::random_access_traversal_tag, boost::random_access_traversal_tag)
+    {
+        bool b;
+        typename boost::detail::iterator_traits<Iterator2>::difference_type n;
+        b = i1 <  i2;
+        b = i1 <= i2;
+        b = i1 >  i2;
+        b = i1 >= i2;
+        n = i1 -  i2;
+
+        b = i2 <  i1;
+        b = i2 <= i1;
+        b = i2 >  i1;
+        b = i2 >= i1;
+        n = i2 -  i1;
+        boost::ignore_unused_variable_warning(b);
+        boost::ignore_unused_variable_warning(n);
+    }
+
+    template <typename Iterator1, typename Iterator2>
+    void interop_rand_access_constraints(
+        Iterator1 const&, Iterator2 const&,
+        boost::single_pass_traversal_tag, boost::single_pass_traversal_tag)
+    { }
+
+  } // namespace detail
+
+  BOOST_concept(InteroperableIterator,(Iterator)(ConstIterator))
+  {
+   private:
+      typedef typename boost::detail::pure_traversal_tag<
+          typename boost::iterator_traversal<
+              Iterator
+          >::type
+      >::type traversal_category;
+
+      typedef typename boost::detail::pure_traversal_tag<
+          typename boost::iterator_traversal<
+              ConstIterator
+          >::type
+      >::type const_traversal_category;
+      
+  public:
+      BOOST_CONCEPT_ASSERT((SinglePassIterator<Iterator>));
+      BOOST_CONCEPT_ASSERT((SinglePassIterator<ConstIterator>));
+
+      BOOST_CONCEPT_USAGE(InteroperableIterator)
+      {
+          detail::interop_single_pass_constraints(i, ci);
+          detail::interop_rand_access_constraints(i, ci, traversal_category(), const_traversal_category());
+
+          ci = i;
+      }
+      
+   private:
+      Iterator      i;
+      ConstIterator ci;
+  };
+
+} // namespace boost_concepts
+
+#include <boost/concept/detail/concept_undef.hpp>
+
+#endif // BOOST_ITERATOR_CONCEPTS_HPP
diff --git a/ext/boost/iterator/iterator_facade.hpp b/ext/boost/iterator/iterator_facade.hpp
new file mode 100644
index 0000000000..967d60f2ba
--- /dev/null
+++ b/ext/boost/iterator/iterator_facade.hpp
@@ -0,0 +1,878 @@
+// (C) Copyright David Abrahams 2002.
+// (C) Copyright Jeremy Siek    2002.
+// (C) Copyright Thomas Witt    2002.
+// Distributed under the Boost Software License, Version 1.0. (See
+// accompanying file LICENSE_1_0.txt or copy at
+// http://www.boost.org/LICENSE_1_0.txt)
+#ifndef BOOST_ITERATOR_FACADE_23022003THW_HPP
+#define BOOST_ITERATOR_FACADE_23022003THW_HPP
+
+#include <boost/iterator.hpp>
+#include <boost/iterator/interoperable.hpp>
+#include <boost/iterator/iterator_traits.hpp>
+
+#include <boost/iterator/detail/facade_iterator_category.hpp>
+#include <boost/iterator/detail/enable_if.hpp>
+
+#include <boost/implicit_cast.hpp>
+#include <boost/static_assert.hpp>
+
+#include <boost/type_traits/is_same.hpp>
+#include <boost/type_traits/add_const.hpp>
+#include <boost/type_traits/add_pointer.hpp>
+#include <boost/type_traits/remove_const.hpp>
+#include <boost/type_traits/remove_reference.hpp>
+#include <boost/type_traits/is_convertible.hpp>
+#include <boost/type_traits/is_pod.hpp>
+
+#include <boost/mpl/eval_if.hpp>
+#include <boost/mpl/if.hpp>
+#include <boost/mpl/or.hpp>
+#include <boost/mpl/and.hpp>
+#include <boost/mpl/not.hpp>
+#include <boost/mpl/always.hpp>
+#include <boost/mpl/apply.hpp>
+#include <boost/mpl/identity.hpp>
+
+#include <boost/iterator/detail/config_def.hpp> // this goes last
+
+namespace boost
+{
+  // This forward declaration is required for the friend declaration
+  // in iterator_core_access
+  template <class I, class V, class TC, class R, class D> class iterator_facade;
+
+  namespace detail
+  {
+    // A binary metafunction class that always returns bool.  VC6
+    // ICEs on mpl::always<bool>, probably because of the default
+    // parameters.
+    struct always_bool2
+    {
+        template <class T, class U>
+        struct apply
+        {
+            typedef bool type;
+        };
+    };
+
+    //
+    // enable if for use in operator implementation.
+    //
+    template <
+        class Facade1
+      , class Facade2
+      , class Return
+    >
+    struct enable_if_interoperable
+#if BOOST_WORKAROUND(BOOST_MSVC, <= 1300)
+    {
+        typedef typename mpl::if_<
+            mpl::or_<
+                is_convertible<Facade1, Facade2>
+              , is_convertible<Facade2, Facade1>
+            >
+          , Return
+          , int[3]
+        >::type type;
+    };        
+#else
+      : ::boost::iterators::enable_if<
+           mpl::or_<
+               is_convertible<Facade1, Facade2>
+             , is_convertible<Facade2, Facade1>
+           >
+         , Return
+        >
+    {};
+#endif 
+
+    //
+    // Generates associated types for an iterator_facade with the
+    // given parameters.
+    //
+    template <
+        class ValueParam
+      , class CategoryOrTraversal
+      , class Reference 
+      , class Difference
+    >
+    struct iterator_facade_types
+    {
+        typedef typename facade_iterator_category<
+            CategoryOrTraversal, ValueParam, Reference
+        >::type iterator_category;
+        
+        typedef typename remove_const<ValueParam>::type value_type;
+        
+        typedef typename mpl::eval_if<
+            boost::detail::iterator_writability_disabled<ValueParam,Reference>
+          , add_pointer<const value_type>
+          , add_pointer<value_type>
+        >::type pointer;
+      
+# if defined(BOOST_NO_TEMPLATE_PARTIAL_SPECIALIZATION)                          \
+    && (BOOST_WORKAROUND(_STLPORT_VERSION, BOOST_TESTED_AT(0x452))              \
+        || BOOST_WORKAROUND(BOOST_DINKUMWARE_STDLIB, BOOST_TESTED_AT(310)))     \
+    || BOOST_WORKAROUND(BOOST_RWSTD_VER, BOOST_TESTED_AT(0x20101))              \
+    || BOOST_WORKAROUND(BOOST_DINKUMWARE_STDLIB, <= 310)
+
+        // To interoperate with some broken library/compiler
+        // combinations, user-defined iterators must be derived from
+        // std::iterator.  It is possible to implement a standard
+        // library for broken compilers without this limitation.
+#  define BOOST_ITERATOR_FACADE_NEEDS_ITERATOR_BASE 1
+
+        typedef
+           iterator<iterator_category, value_type, Difference, pointer, Reference>
+        base;
+# endif
+    };
+
+    // iterators whose dereference operators reference the same value
+    // for all iterators into the same sequence (like many input
+    // iterators) need help with their postfix ++: the referenced
+    // value must be read and stored away before the increment occurs
+    // so that *a++ yields the originally referenced element and not
+    // the next one.
+    template <class Iterator>
+    class postfix_increment_proxy
+    {
+        typedef typename iterator_value<Iterator>::type value_type;
+     public:
+        explicit postfix_increment_proxy(Iterator const& x)
+          : stored_value(*x)
+        {}
+
+        // Returning a mutable reference allows nonsense like
+        // (*r++).mutate(), but it imposes fewer assumptions about the
+        // behavior of the value_type.  In particular, recall taht
+        // (*r).mutate() is legal if operator* returns by value.
+        value_type&
+        operator*() const
+        {
+            return this->stored_value;
+        }
+     private:
+        mutable value_type stored_value;
+    };
+    
+    //
+    // In general, we can't determine that such an iterator isn't
+    // writable -- we also need to store a copy of the old iterator so
+    // that it can be written into.
+    template <class Iterator>
+    class writable_postfix_increment_proxy
+    {
+        typedef typename iterator_value<Iterator>::type value_type;
+     public:
+        explicit writable_postfix_increment_proxy(Iterator const& x)
+          : stored_value(*x)
+          , stored_iterator(x)
+        {}
+
+        // Dereferencing must return a proxy so that both *r++ = o and
+        // value_type(*r++) can work.  In this case, *r is the same as
+        // *r++, and the conversion operator below is used to ensure
+        // readability.
+        writable_postfix_increment_proxy const&
+        operator*() const
+        {
+            return *this;
+        }
+
+        // Provides readability of *r++
+        operator value_type&() const
+        {
+            return stored_value;
+        }
+
+        // Provides writability of *r++
+        template <class T>
+        T const& operator=(T const& x) const
+        {
+            *this->stored_iterator = x;
+            return x;
+        }
+
+        // This overload just in case only non-const objects are writable
+        template <class T>
+        T& operator=(T& x) const
+        {
+            *this->stored_iterator = x;
+            return x;
+        }
+
+        // Provides X(r++)
+        operator Iterator const&() const
+        {
+            return stored_iterator;
+        }
+        
+     private:
+        mutable value_type stored_value;
+        Iterator stored_iterator;
+    };
+
+# ifdef BOOST_NO_TEMPLATE_PARTIAL_SPECIALIZATION
+
+    template <class Reference, class Value>
+    struct is_non_proxy_reference_impl
+    {
+        static Reference r;
+        
+        template <class R>
+        static typename mpl::if_<
+            is_convertible<
+                R const volatile*
+              , Value const volatile*
+            >
+          , char[1]
+          , char[2]
+        >::type& helper(R const&);
+        
+        BOOST_STATIC_CONSTANT(bool, value = sizeof(helper(r)) == 1);
+    };
+        
+    template <class Reference, class Value>
+    struct is_non_proxy_reference
+      : mpl::bool_<
+            is_non_proxy_reference_impl<Reference, Value>::value
+        >
+    {};
+# else 
+    template <class Reference, class Value>
+    struct is_non_proxy_reference
+      : is_convertible<
+            typename remove_reference<Reference>::type
+            const volatile*
+          , Value const volatile*
+        >
+    {};
+# endif 
+        
+    // A metafunction to choose the result type of postfix ++
+    //
+    // Because the C++98 input iterator requirements say that *r++ has
+    // type T (value_type), implementations of some standard
+    // algorithms like lexicographical_compare may use constructions
+    // like:
+    //
+    //          *r++ < *s++
+    //
+    // If *r++ returns a proxy (as required if r is writable but not
+    // multipass), this sort of expression will fail unless the proxy
+    // supports the operator<.  Since there are any number of such
+    // operations, we're not going to try to support them.  Therefore,
+    // even if r++ returns a proxy, *r++ will only return a proxy if
+    // *r also returns a proxy.
+    template <class Iterator, class Value, class Reference, class CategoryOrTraversal>
+    struct postfix_increment_result
+      : mpl::eval_if<
+            mpl::and_<
+                // A proxy is only needed for readable iterators
+                is_convertible<Reference,Value const&>
+                
+                // No multipass iterator can have values that disappear
+                // before positions can be re-visited
+              , mpl::not_<
+                    is_convertible<
+                        typename iterator_category_to_traversal<CategoryOrTraversal>::type
+                      , forward_traversal_tag
+                    >
+                >
+            >
+          , mpl::if_<
+                is_non_proxy_reference<Reference,Value>
+              , postfix_increment_proxy<Iterator>
+              , writable_postfix_increment_proxy<Iterator>
+            >
+          , mpl::identity<Iterator>
+        >
+    {};
+
+    // operator->() needs special support for input iterators to strictly meet the
+    // standard's requirements. If *i is not a reference type, we must still
+    // produce a lvalue to which a pointer can be formed. We do that by
+    // returning an instantiation of this special proxy class template.
+    template <class T>
+    struct operator_arrow_proxy
+    {
+        operator_arrow_proxy(T const* px) : m_value(*px) {}
+        T* operator->() const { return &m_value; }
+        // This function is needed for MWCW and BCC, which won't call operator->
+        // again automatically per 13.3.1.2 para 8
+        operator T*() const { return &m_value; }
+        mutable T m_value;
+    };
+
+    // A metafunction that gets the result type for operator->.  Also
+    // has a static function make() which builds the result from a
+    // Reference
+    template <class ValueType, class Reference, class Pointer>
+    struct operator_arrow_result
+    {
+        // CWPro8.3 won't accept "operator_arrow_result::type", and we
+        // need that type below, so metafunction forwarding would be a
+        // losing proposition here.
+        typedef typename mpl::if_<
+            is_reference<Reference>
+          , Pointer
+          , operator_arrow_proxy<ValueType>
+        >::type type;
+
+        static type make(Reference x)
+        {
+            return implicit_cast<type>(&x);
+        }
+    };
+
+# if BOOST_WORKAROUND(BOOST_MSVC, < 1300)
+    // Deal with ETI
+    template<>
+    struct operator_arrow_result<int, int, int>
+    {
+        typedef int type;
+    };
+# endif
+
+    // A proxy return type for operator[], needed to deal with
+    // iterators that may invalidate referents upon destruction.
+    // Consider the temporary iterator in *(a + n)
+    template <class Iterator>
+    class operator_brackets_proxy
+    {
+        // Iterator is actually an iterator_facade, so we do not have to
+        // go through iterator_traits to access the traits.
+        typedef typename Iterator::reference  reference;
+        typedef typename Iterator::value_type value_type;
+
+     public:
+        operator_brackets_proxy(Iterator const& iter)
+          : m_iter(iter)
+        {}
+
+        operator reference() const
+        {
+            return *m_iter;
+        }
+
+        operator_brackets_proxy& operator=(value_type const& val)
+        {
+            *m_iter = val;
+            return *this;
+        }
+
+     private:
+        Iterator m_iter;
+    };
+
+    // A metafunction that determines whether operator[] must return a
+    // proxy, or whether it can simply return a copy of the value_type.
+    template <class ValueType, class Reference>
+    struct use_operator_brackets_proxy
+      : mpl::not_<
+            mpl::and_<
+                // Really we want an is_copy_constructible trait here,
+                // but is_POD will have to suffice in the meantime.
+                boost::is_POD<ValueType>
+              , iterator_writability_disabled<ValueType,Reference>
+            >
+        >
+    {};
+        
+    template <class Iterator, class Value, class Reference>
+    struct operator_brackets_result
+    {
+        typedef typename mpl::if_<
+            use_operator_brackets_proxy<Value,Reference>
+          , operator_brackets_proxy<Iterator>
+          , Value
+        >::type type;
+    };
+
+    template <class Iterator>
+    operator_brackets_proxy<Iterator> make_operator_brackets_result(Iterator const& iter, mpl::true_)
+    {
+        return operator_brackets_proxy<Iterator>(iter);
+    }
+
+    template <class Iterator>
+    typename Iterator::value_type make_operator_brackets_result(Iterator const& iter, mpl::false_)
+    {
+      return *iter;
+    }
+
+    struct choose_difference_type
+    {
+        template <class I1, class I2>
+        struct apply
+          :
+# ifdef BOOST_NO_ONE_WAY_ITERATOR_INTEROP
+          iterator_difference<I1>
+# elif BOOST_WORKAROUND(BOOST_MSVC, < 1300)
+          mpl::if_<
+              is_convertible<I2,I1>
+            , typename I1::difference_type
+            , typename I2::difference_type
+          >
+# else 
+          mpl::eval_if<
+              is_convertible<I2,I1>
+            , iterator_difference<I1>
+            , iterator_difference<I2>
+          >
+# endif 
+        {};
+
+    };
+  } // namespace detail
+
+
+  // Macros which describe the declarations of binary operators
+# ifdef BOOST_NO_STRICT_ITERATOR_INTEROPERABILITY
+#  define BOOST_ITERATOR_FACADE_INTEROP_HEAD(prefix, op, result_type)       \
+    template <                                                              \
+        class Derived1, class V1, class TC1, class Reference1, class Difference1 \
+      , class Derived2, class V2, class TC2, class Reference2, class Difference2 \
+    >                                                                       \
+    prefix typename mpl::apply2<result_type,Derived1,Derived2>::type \
+    operator op(                                                            \
+        iterator_facade<Derived1, V1, TC1, Reference1, Difference1> const& lhs   \
+      , iterator_facade<Derived2, V2, TC2, Reference2, Difference2> const& rhs)
+# else 
+#  define BOOST_ITERATOR_FACADE_INTEROP_HEAD(prefix, op, result_type)   \
+    template <                                                          \
+        class Derived1, class V1, class TC1, class Reference1, class Difference1 \
+      , class Derived2, class V2, class TC2, class Reference2, class Difference2 \
+    >                                                                   \
+    prefix typename boost::detail::enable_if_interoperable<             \
+        Derived1, Derived2                                              \
+      , typename mpl::apply2<result_type,Derived1,Derived2>::type       \
+    >::type                                                             \
+    operator op(                                                        \
+        iterator_facade<Derived1, V1, TC1, Reference1, Difference1> const& lhs   \
+      , iterator_facade<Derived2, V2, TC2, Reference2, Difference2> const& rhs)
+# endif 
+
+#  define BOOST_ITERATOR_FACADE_PLUS_HEAD(prefix,args)              \
+    template <class Derived, class V, class TC, class R, class D>   \
+    prefix Derived operator+ args
+
+  //
+  // Helper class for granting access to the iterator core interface.
+  //
+  // The simple core interface is used by iterator_facade. The core
+  // interface of a user/library defined iterator type should not be made public
+  // so that it does not clutter the public interface. Instead iterator_core_access
+  // should be made friend so that iterator_facade can access the core
+  // interface through iterator_core_access.
+  //
+  class iterator_core_access
+  {
+# if defined(BOOST_NO_MEMBER_TEMPLATE_FRIENDS)                  
+      // Tasteless as this may seem, making all members public allows member templates
+      // to work in the absence of member template friends.
+   public:
+# else
+      
+      template <class I, class V, class TC, class R, class D> friend class iterator_facade;
+
+#  define BOOST_ITERATOR_FACADE_RELATION(op)                                \
+      BOOST_ITERATOR_FACADE_INTEROP_HEAD(friend,op, boost::detail::always_bool2);
+
+      BOOST_ITERATOR_FACADE_RELATION(==)
+      BOOST_ITERATOR_FACADE_RELATION(!=)
+
+      BOOST_ITERATOR_FACADE_RELATION(<)
+      BOOST_ITERATOR_FACADE_RELATION(>)
+      BOOST_ITERATOR_FACADE_RELATION(<=)
+      BOOST_ITERATOR_FACADE_RELATION(>=)
+#  undef BOOST_ITERATOR_FACADE_RELATION
+
+      BOOST_ITERATOR_FACADE_INTEROP_HEAD(
+          friend, -, boost::detail::choose_difference_type)
+      ;
+
+      BOOST_ITERATOR_FACADE_PLUS_HEAD(
+          friend inline
+          , (iterator_facade<Derived, V, TC, R, D> const&
+           , typename Derived::difference_type)
+      )
+      ;
+
+      BOOST_ITERATOR_FACADE_PLUS_HEAD(
+          friend inline
+        , (typename Derived::difference_type
+           , iterator_facade<Derived, V, TC, R, D> const&)
+      )
+      ;
+
+# endif
+
+      template <class Facade>
+      static typename Facade::reference dereference(Facade const& f)
+      {
+          return f.dereference();
+      }
+
+      template <class Facade>
+      static void increment(Facade& f)
+      {
+          f.increment();
+      }
+
+      template <class Facade>
+      static void decrement(Facade& f)
+      {
+          f.decrement();
+      }
+
+      template <class Facade1, class Facade2>
+      static bool equal(Facade1 const& f1, Facade2 const& f2, mpl::true_)
+      {
+          return f1.equal(f2);
+      }
+
+      template <class Facade1, class Facade2>
+      static bool equal(Facade1 const& f1, Facade2 const& f2, mpl::false_)
+      {
+          return f2.equal(f1);
+      }
+
+      template <class Facade>
+      static void advance(Facade& f, typename Facade::difference_type n)
+      {
+          f.advance(n);
+      }
+
+      template <class Facade1, class Facade2>
+      static typename Facade1::difference_type distance_from(
+          Facade1 const& f1, Facade2 const& f2, mpl::true_)
+      {
+          return -f1.distance_to(f2);
+      }
+
+      template <class Facade1, class Facade2>
+      static typename Facade2::difference_type distance_from(
+          Facade1 const& f1, Facade2 const& f2, mpl::false_)
+      {
+          return f2.distance_to(f1);
+      }
+
+      //
+      // Curiously Recurring Template interface.
+      //
+      template <class I, class V, class TC, class R, class D>
+      static I& derived(iterator_facade<I,V,TC,R,D>& facade)
+      {
+          return *static_cast<I*>(&facade);
+      }
+
+      template <class I, class V, class TC, class R, class D>
+      static I const& derived(iterator_facade<I,V,TC,R,D> const& facade)
+      {
+          return *static_cast<I const*>(&facade);
+      }
+
+   private:
+      // objects of this class are useless
+      iterator_core_access(); //undefined
+  };
+
+  //
+  // iterator_facade - use as a public base class for defining new
+  // standard-conforming iterators.
+  //
+  template <
+      class Derived             // The derived iterator type being constructed
+    , class Value
+    , class CategoryOrTraversal
+    , class Reference   = Value&
+    , class Difference  = std::ptrdiff_t
+  >
+  class iterator_facade
+# ifdef BOOST_ITERATOR_FACADE_NEEDS_ITERATOR_BASE
+    : public boost::detail::iterator_facade_types<
+         Value, CategoryOrTraversal, Reference, Difference
+      >::base
+#  undef BOOST_ITERATOR_FACADE_NEEDS_ITERATOR_BASE
+# endif
+  {
+   private:
+      //
+      // Curiously Recurring Template interface.
+      //
+      Derived& derived()
+      {
+          return *static_cast<Derived*>(this);
+      }
+
+      Derived const& derived() const
+      {
+          return *static_cast<Derived const*>(this);
+      }
+
+      typedef boost::detail::iterator_facade_types<
+         Value, CategoryOrTraversal, Reference, Difference
+      > associated_types;
+
+   protected:
+      // For use by derived classes
+      typedef iterator_facade<Derived,Value,CategoryOrTraversal,Reference,Difference> iterator_facade_;
+      
+   public:
+
+      typedef typename associated_types::value_type value_type;
+      typedef Reference reference;
+      typedef Difference difference_type;
+      typedef typename associated_types::pointer pointer;
+      typedef typename associated_types::iterator_category iterator_category;
+
+      reference operator*() const
+      {
+          return iterator_core_access::dereference(this->derived());
+      }
+
+      typename boost::detail::operator_arrow_result<
+          value_type
+        , reference
+        , pointer
+      >::type
+      operator->() const
+      {
+          return boost::detail::operator_arrow_result<
+              value_type
+            , reference
+            , pointer
+          >::make(*this->derived());
+      }
+        
+      typename boost::detail::operator_brackets_result<Derived,Value,reference>::type
+      operator[](difference_type n) const
+      {
+          typedef boost::detail::use_operator_brackets_proxy<Value,Reference> use_proxy;
+          
+          return boost::detail::make_operator_brackets_result<Derived>(
+              this->derived() + n
+            , use_proxy()
+          );
+      }
+
+      Derived& operator++()
+      {
+          iterator_core_access::increment(this->derived());
+          return this->derived();
+      }
+
+# if BOOST_WORKAROUND(BOOST_MSVC, < 1300)
+      typename boost::detail::postfix_increment_result<Derived,Value,Reference,CategoryOrTraversal>::type
+      operator++(int)
+      {
+          typename boost::detail::postfix_increment_result<Derived,Value,Reference,CategoryOrTraversal>::type
+          tmp(this->derived());
+          ++*this;
+          return tmp;
+      }
+# endif
+      
+      Derived& operator--()
+      {
+          iterator_core_access::decrement(this->derived());
+          return this->derived();
+      }
+
+      Derived operator--(int)
+      {
+          Derived tmp(this->derived());
+          --*this;
+          return tmp;
+      }
+
+      Derived& operator+=(difference_type n)
+      {
+          iterator_core_access::advance(this->derived(), n);
+          return this->derived();
+      }
+
+      Derived& operator-=(difference_type n)
+      {
+          iterator_core_access::advance(this->derived(), -n);
+          return this->derived();
+      }
+
+      Derived operator-(difference_type x) const
+      {
+          Derived result(this->derived());
+          return result -= x;
+      }
+
+# if BOOST_WORKAROUND(BOOST_MSVC, < 1300)
+      // There appears to be a bug which trashes the data of classes
+      // derived from iterator_facade when they are assigned unless we
+      // define this assignment operator.  This bug is only revealed
+      // (so far) in STLPort debug mode, but it's clearly a codegen
+      // problem so we apply the workaround for all MSVC6.
+      iterator_facade& operator=(iterator_facade const&)
+      {
+          return *this;
+      }
+# endif
+  };
+
+# if !BOOST_WORKAROUND(BOOST_MSVC, < 1300)
+  template <class I, class V, class TC, class R, class D>
+  inline typename boost::detail::postfix_increment_result<I,V,R,TC>::type
+  operator++(
+      iterator_facade<I,V,TC,R,D>& i
+    , int
+  )
+  {
+      typename boost::detail::postfix_increment_result<I,V,R,TC>::type
+          tmp(*static_cast<I*>(&i));
+      
+      ++i;
+      
+      return tmp;
+  }
+# endif 
+
+  
+  //
+  // Comparison operator implementation. The library supplied operators
+  // enables the user to provide fully interoperable constant/mutable
+  // iterator types. I.e. the library provides all operators
+  // for all mutable/constant iterator combinations.
+  //
+  // Note though that this kind of interoperability for constant/mutable
+  // iterators is not required by the standard for container iterators.
+  // All the standard asks for is a conversion mutable -> constant.
+  // Most standard library implementations nowadays provide fully interoperable
+  // iterator implementations, but there are still heavily used implementations
+  // that do not provide them. (Actually it's even worse, they do not provide
+  // them for only a few iterators.)
+  //
+  // ?? Maybe a BOOST_ITERATOR_NO_FULL_INTEROPERABILITY macro should
+  //    enable the user to turn off mixed type operators
+  //
+  // The library takes care to provide only the right operator overloads.
+  // I.e.
+  //
+  // bool operator==(Iterator,      Iterator);
+  // bool operator==(ConstIterator, Iterator);
+  // bool operator==(Iterator,      ConstIterator);
+  // bool operator==(ConstIterator, ConstIterator);
+  //
+  //   ...
+  //
+  // In order to do so it uses c++ idioms that are not yet widely supported
+  // by current compiler releases. The library is designed to degrade gracefully
+  // in the face of compiler deficiencies. In general compiler
+  // deficiencies result in less strict error checking and more obscure
+  // error messages, functionality is not affected.
+  //
+  // For full operation compiler support for "Substitution Failure Is Not An Error"
+  // (aka. enable_if) and boost::is_convertible is required.
+  //
+  // The following problems occur if support is lacking.
+  //
+  // Pseudo code
+  //
+  // ---------------
+  // AdaptorA<Iterator1> a1;
+  // AdaptorA<Iterator2> a2;
+  //
+  // // This will result in a no such overload error in full operation
+  // // If enable_if or is_convertible is not supported
+  // // The instantiation will fail with an error hopefully indicating that
+  // // there is no operator== for Iterator1, Iterator2
+  // // The same will happen if no enable_if is used to remove
+  // // false overloads from the templated conversion constructor
+  // // of AdaptorA.
+  //
+  // a1 == a2;
+  // ----------------
+  //
+  // AdaptorA<Iterator> a;
+  // AdaptorB<Iterator> b;
+  //
+  // // This will result in a no such overload error in full operation
+  // // If enable_if is not supported the static assert used
+  // // in the operator implementation will fail.
+  // // This will accidently work if is_convertible is not supported.
+  //
+  // a == b;
+  // ----------------
+  //
+
+# ifdef BOOST_NO_ONE_WAY_ITERATOR_INTEROP
+#  define BOOST_ITERATOR_CONVERTIBLE(a,b) mpl::true_()
+# else
+#  define BOOST_ITERATOR_CONVERTIBLE(a,b) is_convertible<a,b>()
+# endif
+
+# define BOOST_ITERATOR_FACADE_INTEROP(op, result_type, return_prefix, base_op) \
+  BOOST_ITERATOR_FACADE_INTEROP_HEAD(inline, op, result_type)                   \
+  {                                                                             \
+      /* For those compilers that do not support enable_if */                   \
+      BOOST_STATIC_ASSERT((                                                     \
+          is_interoperable< Derived1, Derived2 >::value                         \
+      ));                                                                       \
+      return_prefix iterator_core_access::base_op(                              \
+          *static_cast<Derived1 const*>(&lhs)                                   \
+        , *static_cast<Derived2 const*>(&rhs)                                   \
+        , BOOST_ITERATOR_CONVERTIBLE(Derived2,Derived1)                         \
+      );                                                                        \
+  }
+
+# define BOOST_ITERATOR_FACADE_RELATION(op, return_prefix, base_op) \
+  BOOST_ITERATOR_FACADE_INTEROP(                                    \
+      op                                                            \
+    , boost::detail::always_bool2                                   \
+    , return_prefix                                                 \
+    , base_op                                                       \
+  )
+
+  BOOST_ITERATOR_FACADE_RELATION(==, return, equal)
+  BOOST_ITERATOR_FACADE_RELATION(!=, return !, equal)
+
+  BOOST_ITERATOR_FACADE_RELATION(<, return 0 >, distance_from)
+  BOOST_ITERATOR_FACADE_RELATION(>, return 0 <, distance_from)
+  BOOST_ITERATOR_FACADE_RELATION(<=, return 0 >=, distance_from)
+  BOOST_ITERATOR_FACADE_RELATION(>=, return 0 <=, distance_from)
+# undef BOOST_ITERATOR_FACADE_RELATION
+
+  // operator- requires an additional part in the static assertion
+  BOOST_ITERATOR_FACADE_INTEROP(
+      -
+    , boost::detail::choose_difference_type
+    , return
+    , distance_from
+  )
+# undef BOOST_ITERATOR_FACADE_INTEROP
+# undef BOOST_ITERATOR_FACADE_INTEROP_HEAD
+
+# define BOOST_ITERATOR_FACADE_PLUS(args)           \
+  BOOST_ITERATOR_FACADE_PLUS_HEAD(inline, args)     \
+  {                                                 \
+      Derived tmp(static_cast<Derived const&>(i));  \
+      return tmp += n;                              \
+  }
+
+BOOST_ITERATOR_FACADE_PLUS((
+  iterator_facade<Derived, V, TC, R, D> const& i
+  , typename Derived::difference_type n
+))
+
+BOOST_ITERATOR_FACADE_PLUS((
+    typename Derived::difference_type n
+    , iterator_facade<Derived, V, TC, R, D> const& i
+))
+# undef BOOST_ITERATOR_FACADE_PLUS
+# undef BOOST_ITERATOR_FACADE_PLUS_HEAD
+
+} // namespace boost
+
+#include <boost/iterator/detail/config_undef.hpp>
+
+#endif // BOOST_ITERATOR_FACADE_23022003THW_HPP
diff --git a/ext/boost/iterator/iterator_traits.hpp b/ext/boost/iterator/iterator_traits.hpp
new file mode 100644
index 0000000000..960970e8db
--- /dev/null
+++ b/ext/boost/iterator/iterator_traits.hpp
@@ -0,0 +1,92 @@
+// Copyright David Abrahams 2003.
+// Distributed under the Boost Software License, Version 1.0. (See
+// accompanying file LICENSE_1_0.txt or copy at
+// http://www.boost.org/LICENSE_1_0.txt)
+#ifndef ITERATOR_TRAITS_DWA200347_HPP
+# define ITERATOR_TRAITS_DWA200347_HPP
+
+# include <boost/detail/iterator.hpp>
+# include <boost/detail/workaround.hpp>
+
+namespace boost { 
+
+// Unfortunately, g++ 2.95.x chokes when we define a class template
+// iterator_category which has the same name as its
+// std::iterator_category() function, probably due in part to the
+// "std:: is visible globally" hack it uses.  Use
+// BOOST_ITERATOR_CATEGORY to write code that's portable to older
+// GCCs.
+
+# if BOOST_WORKAROUND(__GNUC__, <= 2)
+#  define BOOST_ITERATOR_CATEGORY iterator_category_
+# else
+#  define BOOST_ITERATOR_CATEGORY iterator_category
+# endif
+
+
+template <class Iterator>
+struct iterator_value
+{
+    typedef typename boost::detail::iterator_traits<Iterator>::value_type type;
+};
+  
+template <class Iterator>
+struct iterator_reference
+{
+    typedef typename boost::detail::iterator_traits<Iterator>::reference type;
+};
+  
+  
+template <class Iterator>
+struct iterator_pointer
+{
+    typedef typename boost::detail::iterator_traits<Iterator>::pointer type;
+};
+  
+template <class Iterator>
+struct iterator_difference
+{
+    typedef typename boost::detail::iterator_traits<Iterator>::difference_type type;
+};
+
+template <class Iterator>
+struct BOOST_ITERATOR_CATEGORY
+{
+    typedef typename boost::detail::iterator_traits<Iterator>::iterator_category type;
+};
+
+# if BOOST_WORKAROUND(BOOST_MSVC, < 1300)
+template <>
+struct iterator_value<int>
+{
+    typedef void type;
+};
+  
+template <>
+struct iterator_reference<int>
+{
+    typedef void type;
+};
+
+template <>
+struct iterator_pointer<int>
+{
+    typedef void type;
+};
+  
+template <>
+struct iterator_difference<int>
+{
+    typedef void type;
+};
+  
+template <>
+struct BOOST_ITERATOR_CATEGORY<int>
+{
+    typedef void type;
+};
+# endif
+
+} // namespace boost::iterator
+
+#endif // ITERATOR_TRAITS_DWA200347_HPP
diff --git a/ext/boost/iterator/new_iterator_tests.hpp b/ext/boost/iterator/new_iterator_tests.hpp
new file mode 100644
index 0000000000..caad700aef
--- /dev/null
+++ b/ext/boost/iterator/new_iterator_tests.hpp
@@ -0,0 +1,264 @@
+#ifndef BOOST_NEW_ITERATOR_TESTS_HPP
+# define BOOST_NEW_ITERATOR_TESTS_HPP
+
+//
+// Copyright (c) David Abrahams 2001.
+// Copyright (c) Jeremy Siek 2001-2003.
+// Copyright (c) Thomas Witt 2002.
+//
+// Use, modification and distribution is subject to the
+// Boost Software License, Version 1.0.
+// (See accompanying file LICENSE_1_0.txt or copy at
+// http://www.boost.org/LICENSE_1_0.txt)
+//
+
+// This is meant to be the beginnings of a comprehensive, generic
+// test suite for STL concepts such as iterators and containers.
+//
+// Revision History:
+// 28 Oct 2002  Started update for new iterator categories
+//              (Jeremy Siek)
+// 28 Apr 2002  Fixed input iterator requirements.
+//              For a == b a++ == b++ is no longer required.
+//              See 24.1.1/3 for details.
+//              (Thomas Witt)
+// 08 Feb 2001  Fixed bidirectional iterator test so that
+//              --i is no longer a precondition.
+//              (Jeremy Siek)
+// 04 Feb 2001  Added lvalue test, corrected preconditions
+//              (David Abrahams)
+
+# include <iterator>
+# include <boost/type_traits.hpp>
+# include <boost/static_assert.hpp>
+# include <boost/concept_archetype.hpp> // for detail::dummy_constructor
+# include <boost/detail/iterator.hpp>
+# include <boost/pending/iterator_tests.hpp>
+# include <boost/iterator/is_readable_iterator.hpp>
+# include <boost/iterator/is_lvalue_iterator.hpp>
+
+# include <boost/iterator/detail/config_def.hpp>
+# include <boost/detail/is_incrementable.hpp>
+# include <boost/detail/lightweight_test.hpp>
+
+namespace boost {
+
+
+// Do separate tests for *i++ so we can treat, e.g., smart pointers,
+// as readable and/or writable iterators.
+template <class Iterator, class T>
+void readable_iterator_traversal_test(Iterator i1, T v, mpl::true_)
+{
+    T v2(*i1++);
+    BOOST_TEST(v == v2);
+}
+
+template <class Iterator, class T>
+void readable_iterator_traversal_test(const Iterator i1, T v, mpl::false_)
+{}
+
+template <class Iterator, class T>
+void writable_iterator_traversal_test(Iterator i1, T v, mpl::true_)
+{
+    ++i1;  // we just wrote into that position
+    *i1++ = v;
+    Iterator x(i1++);
+    (void)x;
+}
+
+template <class Iterator, class T>
+void writable_iterator_traversal_test(const Iterator i1, T v, mpl::false_)
+{}
+
+
+// Preconditions: *i == v
+template <class Iterator, class T>
+void readable_iterator_test(const Iterator i1, T v)
+{
+  Iterator i2(i1); // Copy Constructible
+  typedef typename detail::iterator_traits<Iterator>::reference ref_t;
+  ref_t r1 = *i1;
+  ref_t r2 = *i2;
+  T v1 = r1;
+  T v2 = r2;
+  BOOST_TEST(v1 == v);
+  BOOST_TEST(v2 == v);
+
+# if !BOOST_WORKAROUND(__MWERKS__, <= 0x2407)
+  readable_iterator_traversal_test(i1, v, detail::is_postfix_incrementable<Iterator>());
+      
+  // I think we don't really need this as it checks the same things as
+  // the above code.
+  BOOST_STATIC_ASSERT(is_readable_iterator<Iterator>::value);
+# endif 
+}
+
+template <class Iterator, class T>
+void writable_iterator_test(Iterator i, T v, T v2)
+{
+  Iterator i2(i); // Copy Constructible
+  *i2 = v;
+
+# if !BOOST_WORKAROUND(__MWERKS__, <= 0x2407)
+  writable_iterator_traversal_test(
+      i, v2, mpl::and_<
+          detail::is_incrementable<Iterator>
+        , detail::is_postfix_incrementable<Iterator>
+      >());
+# endif 
+}
+
+template <class Iterator>
+void swappable_iterator_test(Iterator i, Iterator j)
+{
+  Iterator i2(i), j2(j);
+  typename detail::iterator_traits<Iterator>::value_type bi = *i, bj = *j;
+  iter_swap(i2, j2);
+  typename detail::iterator_traits<Iterator>::value_type ai = *i, aj = *j;
+  BOOST_TEST(bi == aj && bj == ai);
+}
+
+template <class Iterator, class T>
+void constant_lvalue_iterator_test(Iterator i, T v1)
+{
+  Iterator i2(i);
+  typedef typename detail::iterator_traits<Iterator>::value_type value_type;
+  typedef typename detail::iterator_traits<Iterator>::reference reference;
+  BOOST_STATIC_ASSERT((is_same<const value_type&, reference>::value));
+  const T& v2 = *i2;
+  BOOST_TEST(v1 == v2);
+# ifndef BOOST_NO_LVALUE_RETURN_DETECTION
+  BOOST_STATIC_ASSERT(is_lvalue_iterator<Iterator>::value);
+  BOOST_STATIC_ASSERT(!is_non_const_lvalue_iterator<Iterator>::value);
+# endif 
+}
+
+template <class Iterator, class T>
+void non_const_lvalue_iterator_test(Iterator i, T v1, T v2)
+{
+  Iterator i2(i);
+  typedef typename detail::iterator_traits<Iterator>::value_type value_type;
+  typedef typename detail::iterator_traits<Iterator>::reference reference;
+  BOOST_STATIC_ASSERT((is_same<value_type&, reference>::value));
+  T& v3 = *i2;
+  BOOST_TEST(v1 == v3);
+  
+  // A non-const lvalue iterator is not neccessarily writable, but we
+  // are assuming the value_type is assignable here
+  *i = v2;
+  
+  T& v4 = *i2;
+  BOOST_TEST(v2 == v4);
+# ifndef BOOST_NO_LVALUE_RETURN_DETECTION
+  BOOST_STATIC_ASSERT(is_lvalue_iterator<Iterator>::value);
+  BOOST_STATIC_ASSERT(is_non_const_lvalue_iterator<Iterator>::value);
+# endif 
+}
+
+template <class Iterator, class T>
+void forward_readable_iterator_test(Iterator i, Iterator j, T val1, T val2)
+{
+  Iterator i2;
+  Iterator i3(i);
+  i2 = i;
+  BOOST_TEST(i2 == i3);
+  BOOST_TEST(i != j);
+  BOOST_TEST(i2 != j);
+  readable_iterator_test(i, val1);
+  readable_iterator_test(i2, val1);
+  readable_iterator_test(i3, val1);
+
+  BOOST_TEST(i == i2++);
+  BOOST_TEST(i != ++i3);
+
+  readable_iterator_test(i2, val2);
+  readable_iterator_test(i3, val2);
+
+  readable_iterator_test(i, val1);
+}
+
+template <class Iterator, class T>
+void forward_swappable_iterator_test(Iterator i, Iterator j, T val1, T val2)
+{
+  forward_readable_iterator_test(i, j, val1, val2);
+  Iterator i2 = i;
+  ++i2;
+  swappable_iterator_test(i, i2);
+}
+
+// bidirectional
+// Preconditions: *i == v1, *++i == v2
+template <class Iterator, class T>
+void bidirectional_readable_iterator_test(Iterator i, T v1, T v2)
+{
+  Iterator j(i);
+  ++j;
+  forward_readable_iterator_test(i, j, v1, v2);
+  ++i;
+
+  Iterator i1 = i, i2 = i;
+
+  BOOST_TEST(i == i1--);
+  BOOST_TEST(i != --i2);
+
+  readable_iterator_test(i, v2);
+  readable_iterator_test(i1, v1);
+  readable_iterator_test(i2, v1);
+
+  --i;
+  BOOST_TEST(i == i1);
+  BOOST_TEST(i == i2);
+  ++i1;
+  ++i2;
+
+  readable_iterator_test(i, v1);
+  readable_iterator_test(i1, v2);
+  readable_iterator_test(i2, v2);
+}
+
+// random access
+// Preconditions: [i,i+N) is a valid range
+template <class Iterator, class TrueVals>
+void random_access_readable_iterator_test(Iterator i, int N, TrueVals vals)
+{
+  bidirectional_readable_iterator_test(i, vals[0], vals[1]);
+  const Iterator j = i;
+  int c;
+
+  for (c = 0; c < N-1; ++c)
+  {
+    BOOST_TEST(i == j + c);
+    BOOST_TEST(*i == vals[c]);
+    typename detail::iterator_traits<Iterator>::value_type x = j[c];
+    BOOST_TEST(*i == x);
+    BOOST_TEST(*i == *(j + c));
+    BOOST_TEST(*i == *(c + j));
+    ++i;
+    BOOST_TEST(i > j);
+    BOOST_TEST(i >= j);
+    BOOST_TEST(j <= i);
+    BOOST_TEST(j < i);
+  }
+
+  Iterator k = j + N - 1;
+  for (c = 0; c < N-1; ++c)
+  {
+    BOOST_TEST(i == k - c);
+    BOOST_TEST(*i == vals[N - 1 - c]);
+    typename detail::iterator_traits<Iterator>::value_type x = j[N - 1 - c];
+    BOOST_TEST(*i == x);
+    Iterator q = k - c; 
+    BOOST_TEST(*i == *q);
+    BOOST_TEST(i > j);
+    BOOST_TEST(i >= j);
+    BOOST_TEST(j <= i);
+    BOOST_TEST(j < i);
+    --i;
+  }
+}
+
+} // namespace boost
+
+# include <boost/iterator/detail/config_undef.hpp>
+
+#endif // BOOST_NEW_ITERATOR_TESTS_HPP
diff --git a/ext/boost/iterator/permutation_iterator.hpp b/ext/boost/iterator/permutation_iterator.hpp
new file mode 100644
index 0000000000..23d11986da
--- /dev/null
+++ b/ext/boost/iterator/permutation_iterator.hpp
@@ -0,0 +1,72 @@
+// (C) Copyright Toon Knapen    2001.
+// (C) Copyright David Abrahams 2003.
+// (C) Copyright Roland Richter 2003.
+// Distributed under the Boost Software License, Version 1.0. (See
+// accompanying file LICENSE_1_0.txt or copy at
+// http://www.boost.org/LICENSE_1_0.txt)
+
+#ifndef BOOST_PERMUTATION_ITERATOR_HPP
+#define BOOST_PERMUTATION_ITERATOR_HPP
+
+#include <iterator>
+
+#include <boost/iterator/iterator_adaptor.hpp>
+
+
+namespace boost
+{
+
+template< class ElementIterator
+        , class IndexIterator>
+class permutation_iterator
+  : public iterator_adaptor< 
+             permutation_iterator<ElementIterator, IndexIterator>
+           , IndexIterator, typename detail::iterator_traits<ElementIterator>::value_type
+           , use_default, typename detail::iterator_traits<ElementIterator>::reference>
+{
+  typedef iterator_adaptor< 
+            permutation_iterator<ElementIterator, IndexIterator>
+          , IndexIterator, typename detail::iterator_traits<ElementIterator>::value_type
+          , use_default, typename detail::iterator_traits<ElementIterator>::reference> super_t;
+
+  friend class iterator_core_access;
+
+public:
+  permutation_iterator() : m_elt_iter() {}
+
+  explicit permutation_iterator(ElementIterator x, IndexIterator y) 
+      : super_t(y), m_elt_iter(x) {}
+
+  template<class OtherElementIterator, class OtherIndexIterator>
+  permutation_iterator(
+      permutation_iterator<OtherElementIterator, OtherIndexIterator> const& r
+      , typename enable_if_convertible<OtherElementIterator, ElementIterator>::type* = 0
+      , typename enable_if_convertible<OtherIndexIterator, IndexIterator>::type* = 0
+      )
+    : super_t(r.base()), m_elt_iter(r.m_elt_iter)
+  {}
+
+private:
+    typename super_t::reference dereference() const
+        { return *(m_elt_iter + *this->base()); }
+
+#ifndef BOOST_NO_MEMBER_TEMPLATE_FRIENDS
+    template <class,class> friend class permutation_iterator;
+#else
+ public:
+#endif 
+    ElementIterator m_elt_iter;
+};
+
+
+template <class ElementIterator, class IndexIterator>
+permutation_iterator<ElementIterator, IndexIterator> 
+make_permutation_iterator( ElementIterator e, IndexIterator i )
+{
+    return permutation_iterator<ElementIterator, IndexIterator>( e, i );
+}
+
+
+} // namespace boost
+
+#endif
diff --git a/ext/boost/iterator/reverse_iterator.hpp b/ext/boost/iterator/reverse_iterator.hpp
new file mode 100644
index 0000000000..97b6b4861d
--- /dev/null
+++ b/ext/boost/iterator/reverse_iterator.hpp
@@ -0,0 +1,69 @@
+// (C) Copyright David Abrahams 2002.
+// (C) Copyright Jeremy Siek    2002.
+// (C) Copyright Thomas Witt    2002.
+// Distributed under the Boost Software License, Version 1.0. (See
+// accompanying file LICENSE_1_0.txt or copy at
+// http://www.boost.org/LICENSE_1_0.txt)
+#ifndef BOOST_REVERSE_ITERATOR_23022003THW_HPP
+#define BOOST_REVERSE_ITERATOR_23022003THW_HPP
+
+#include <boost/iterator.hpp>
+#include <boost/utility.hpp>
+#include <boost/iterator/iterator_adaptor.hpp>
+
+namespace boost
+{
+
+  //
+  //
+  //
+  template <class Iterator>
+  class reverse_iterator
+      : public iterator_adaptor< reverse_iterator<Iterator>, Iterator >
+  {
+      typedef iterator_adaptor< reverse_iterator<Iterator>, Iterator > super_t;
+
+      friend class iterator_core_access;
+
+   public:
+      reverse_iterator() {}
+
+      explicit reverse_iterator(Iterator x) 
+          : super_t(x) {}
+
+      template<class OtherIterator>
+      reverse_iterator(
+          reverse_iterator<OtherIterator> const& r
+          , typename enable_if_convertible<OtherIterator, Iterator>::type* = 0
+          )
+          : super_t(r.base())
+      {}
+
+   private:
+      typename super_t::reference dereference() const { return *boost::prior(this->base()); }
+    
+      void increment() { --this->base_reference(); }
+      void decrement() { ++this->base_reference(); }
+
+      void advance(typename super_t::difference_type n)
+      {
+          this->base_reference() += -n;
+      }
+
+      template <class OtherIterator>
+      typename super_t::difference_type
+      distance_to(reverse_iterator<OtherIterator> const& y) const
+      {
+          return this->base_reference() - y.base();
+      }
+  };
+
+  template <class BidirectionalIterator>
+  reverse_iterator<BidirectionalIterator> make_reverse_iterator(BidirectionalIterator x)
+  {
+      return reverse_iterator<BidirectionalIterator>(x);
+  }
+
+} // namespace boost
+
+#endif // BOOST_REVERSE_ITERATOR_23022003THW_HPP
diff --git a/ext/boost/iterator/transform_iterator.hpp b/ext/boost/iterator/transform_iterator.hpp
new file mode 100644
index 0000000000..e449a8b0d3
--- /dev/null
+++ b/ext/boost/iterator/transform_iterator.hpp
@@ -0,0 +1,188 @@
+// (C) Copyright David Abrahams 2002.
+// (C) Copyright Jeremy Siek    2002.
+// (C) Copyright Thomas Witt    2002.
+// Distributed under the Boost Software License, Version 1.0. (See
+// accompanying file LICENSE_1_0.txt or copy at
+// http://www.boost.org/LICENSE_1_0.txt)
+#ifndef BOOST_TRANSFORM_ITERATOR_23022003THW_HPP
+#define BOOST_TRANSFORM_ITERATOR_23022003THW_HPP
+
+#include <boost/function.hpp>
+#include <boost/iterator.hpp>
+#include <boost/iterator/detail/enable_if.hpp>
+#include <boost/iterator/iterator_adaptor.hpp>
+#include <boost/iterator/iterator_categories.hpp>
+#include <boost/mpl/not.hpp>
+#include <boost/mpl/bool.hpp>
+#include <boost/type_traits/function_traits.hpp>
+#include <boost/type_traits/is_const.hpp>
+#include <boost/type_traits/is_class.hpp>
+#include <boost/type_traits/is_function.hpp>
+#include <boost/type_traits/is_reference.hpp>
+#include <boost/type_traits/remove_const.hpp>
+#include <boost/type_traits/remove_reference.hpp>
+
+#if BOOST_WORKAROUND(BOOST_MSVC, BOOST_TESTED_AT(1310))
+# include <boost/type_traits/is_base_and_derived.hpp>
+
+#endif 
+#include <boost/iterator/detail/config_def.hpp>
+
+
+namespace boost
+{
+  template <class UnaryFunction, class Iterator, class Reference = use_default, class Value = use_default>
+  class transform_iterator;
+
+  namespace detail 
+  {
+
+    template <class UnaryFunc>
+    struct function_object_result
+    {
+      typedef typename UnaryFunc::result_type type;
+    };
+
+#ifndef BOOST_NO_TEMPLATE_PARTIAL_SPECIALIZATION
+    template <class Return, class Argument>
+    struct function_object_result<Return(*)(Argument)>
+    {
+      typedef Return type;
+    };
+#endif
+
+    // Compute the iterator_adaptor instantiation to be used for transform_iterator
+    template <class UnaryFunc, class Iterator, class Reference, class Value>
+    struct transform_iterator_base
+    {
+     private:
+        // By default, dereferencing the iterator yields the same as
+        // the function.  Do we need to adjust the way
+        // function_object_result is computed for the standard
+        // proposal (e.g. using Doug's result_of)?
+        typedef typename ia_dflt_help<
+            Reference
+          , function_object_result<UnaryFunc>
+        >::type reference;
+
+        // To get the default for Value: remove any reference on the
+        // result type, but retain any constness to signal
+        // non-writability.  Note that if we adopt Thomas' suggestion
+        // to key non-writability *only* on the Reference argument,
+        // we'd need to strip constness here as well.
+        typedef typename ia_dflt_help<
+            Value
+          , remove_reference<reference>
+        >::type cv_value_type;
+
+     public:
+        typedef iterator_adaptor<
+            transform_iterator<UnaryFunc, Iterator, Reference, Value>
+          , Iterator
+          , cv_value_type
+          , use_default    // Leave the traversal category alone
+          , reference
+        > type;
+    };
+  }
+
+  template <class UnaryFunc, class Iterator, class Reference, class Value>
+  class transform_iterator
+    : public boost::detail::transform_iterator_base<UnaryFunc, Iterator, Reference, Value>::type
+  {
+    typedef typename
+    boost::detail::transform_iterator_base<UnaryFunc, Iterator, Reference, Value>::type
+    super_t;
+
+    friend class iterator_core_access;
+
+  public:
+    transform_iterator() { }
+
+    transform_iterator(Iterator const& x, UnaryFunc f)
+      : super_t(x), m_f(f) { }
+
+    explicit transform_iterator(Iterator const& x)
+      : super_t(x)
+    {
+        // Pro8 is a little too aggressive about instantiating the
+        // body of this function.
+#if !BOOST_WORKAROUND(__MWERKS__, BOOST_TESTED_AT(0x3003))
+        // don't provide this constructor if UnaryFunc is a
+        // function pointer type, since it will be 0.  Too dangerous.
+        BOOST_STATIC_ASSERT(is_class<UnaryFunc>::value);
+#endif 
+    }
+
+    template<
+        class OtherUnaryFunction
+      , class OtherIterator
+      , class OtherReference
+      , class OtherValue>
+    transform_iterator(
+         transform_iterator<OtherUnaryFunction, OtherIterator, OtherReference, OtherValue> const& t
+       , typename enable_if_convertible<OtherIterator, Iterator>::type* = 0
+#if !BOOST_WORKAROUND(BOOST_MSVC, == 1310)
+       , typename enable_if_convertible<OtherUnaryFunction, UnaryFunc>::type* = 0
+#endif 
+    )
+      : super_t(t.base()), m_f(t.functor())
+   {}
+
+    UnaryFunc functor() const
+      { return m_f; }
+
+  private:
+    typename super_t::reference dereference() const
+    { return m_f(*this->base()); }
+
+    // Probably should be the initial base class so it can be
+    // optimized away via EBO if it is an empty class.
+    UnaryFunc m_f;
+  };
+
+  template <class UnaryFunc, class Iterator>
+  transform_iterator<UnaryFunc, Iterator>
+  make_transform_iterator(Iterator it, UnaryFunc fun)
+  {
+      return transform_iterator<UnaryFunc, Iterator>(it, fun);
+  }
+
+  // Version which allows explicit specification of the UnaryFunc
+  // type.
+  //
+  // This generator is not provided if UnaryFunc is a function
+  // pointer type, because it's too dangerous: the default-constructed
+  // function pointer in the iterator be 0, leading to a runtime
+  // crash.
+  template <class UnaryFunc, class Iterator>
+#if BOOST_WORKAROUND(BOOST_MSVC, <= 1300)
+  typename mpl::if_<
+#else 
+  typename iterators::enable_if<
+#endif 
+      is_class<UnaryFunc>   // We should probably find a cheaper test than is_class<>
+    , transform_iterator<UnaryFunc, Iterator>
+#if BOOST_WORKAROUND(BOOST_MSVC, <= 1300)
+    , int[3]
+#endif 
+  >::type
+  make_transform_iterator(Iterator it)
+  {
+      return transform_iterator<UnaryFunc, Iterator>(it, UnaryFunc());
+  }
+
+#if defined(BOOST_NO_TEMPLATE_PARTIAL_SPECIALIZATION ) && !defined(BOOST_NO_FUNCTION_TEMPLATE_ORDERING)
+  template <class Return, class Argument, class Iterator>
+  transform_iterator< Return (*)(Argument), Iterator, Return>
+  make_transform_iterator(Iterator it, Return (*fun)(Argument))
+  {
+    return transform_iterator<Return (*)(Argument), Iterator, Return>(it, fun);
+  }
+#endif
+
+} // namespace boost
+
+#include <boost/iterator/detail/config_undef.hpp>
+
+#endif // BOOST_TRANSFORM_ITERATOR_23022003THW_HPP
diff --git a/ext/boost/iterator/zip_iterator.hpp b/ext/boost/iterator/zip_iterator.hpp
new file mode 100644
index 0000000000..f3896ad955
--- /dev/null
+++ b/ext/boost/iterator/zip_iterator.hpp
@@ -0,0 +1,585 @@
+// Copyright David Abrahams and Thomas Becker 2000-2006. Distributed
+// under the Boost Software License, Version 1.0. (See accompanying
+// file LICENSE_1_0.txt or copy at
+// http://www.boost.org/LICENSE_1_0.txt)
+
+#ifndef BOOST_ZIP_ITERATOR_TMB_07_13_2003_HPP_
+# define BOOST_ZIP_ITERATOR_TMB_07_13_2003_HPP_
+
+#include <stddef.h>
+#include <boost/iterator.hpp>
+#include <boost/iterator/iterator_traits.hpp>
+#include <boost/iterator/iterator_facade.hpp>
+#include <boost/iterator/iterator_adaptor.hpp> // for enable_if_convertible
+#include <boost/iterator/iterator_categories.hpp>
+#include <boost/detail/iterator.hpp>
+
+#include <boost/iterator/detail/minimum_category.hpp>
+
+#include <boost/tuple/tuple.hpp>
+
+#include <boost/type_traits/is_same.hpp>
+#include <boost/mpl/and.hpp>
+#include <boost/mpl/apply.hpp>
+#include <boost/mpl/eval_if.hpp>
+#include <boost/mpl/lambda.hpp>
+#include <boost/mpl/placeholders.hpp>
+#include <boost/mpl/aux_/lambda_support.hpp>
+
+namespace boost {
+
+  // Zip iterator forward declaration for zip_iterator_base
+  template<typename IteratorTuple>
+  class zip_iterator;
+
+  // One important design goal of the zip_iterator is to isolate all
+  // functionality whose implementation relies on the current tuple
+  // implementation. This goal has been achieved as follows: Inside
+  // the namespace detail there is a namespace tuple_impl_specific.
+  // This namespace encapsulates all functionality that is specific
+  // to the current Boost tuple implementation. More precisely, the
+  // namespace tuple_impl_specific provides the following tuple
+  // algorithms and meta-algorithms for the current Boost tuple
+  // implementation:
+  //
+  // tuple_meta_transform
+  // tuple_meta_accumulate
+  // tuple_transform
+  // tuple_for_each
+  //
+  // If the tuple implementation changes, all that needs to be
+  // replaced is the implementation of these four (meta-)algorithms.
+
+  namespace detail
+  {
+
+    // Functors to be used with tuple algorithms
+    //
+    template<typename DiffType>
+    class advance_iterator
+    {
+    public:
+      advance_iterator(DiffType step) : m_step(step) {}
+      
+      template<typename Iterator>
+      void operator()(Iterator& it) const
+      { it += m_step; }
+
+    private:
+      DiffType m_step;
+    };
+    //
+    struct increment_iterator
+    {
+      template<typename Iterator>
+      void operator()(Iterator& it)
+      { ++it; }
+    };
+    //
+    struct decrement_iterator
+    {
+      template<typename Iterator>
+      void operator()(Iterator& it)
+      { --it; }
+    };
+    //
+    struct dereference_iterator
+    {
+      template<typename Iterator>
+      struct apply
+      { 
+        typedef typename
+          iterator_traits<Iterator>::reference
+        type;
+      };
+
+      template<typename Iterator>
+        typename apply<Iterator>::type operator()(Iterator const& it)
+      { return *it; }
+    };
+           
+
+    // The namespace tuple_impl_specific provides two meta-
+    // algorithms and two algorithms for tuples.
+    //
+    namespace tuple_impl_specific
+    {
+      // Meta-transform algorithm for tuples
+      //
+      template<typename Tuple, class UnaryMetaFun>
+      struct tuple_meta_transform;
+      
+      template<typename Tuple, class UnaryMetaFun>
+      struct tuple_meta_transform_impl
+      {
+          typedef tuples::cons<
+              typename mpl::apply1<
+                  typename mpl::lambda<UnaryMetaFun>::type
+                , typename Tuple::head_type
+              >::type
+            , typename tuple_meta_transform<
+                  typename Tuple::tail_type
+                , UnaryMetaFun 
+              >::type
+          > type;
+      };
+
+      template<typename Tuple, class UnaryMetaFun>
+      struct tuple_meta_transform
+        : mpl::eval_if<
+              boost::is_same<Tuple, tuples::null_type>
+            , mpl::identity<tuples::null_type>
+            , tuple_meta_transform_impl<Tuple, UnaryMetaFun>
+        >
+      {
+      };
+      
+      // Meta-accumulate algorithm for tuples. Note: The template 
+      // parameter StartType corresponds to the initial value in 
+      // ordinary accumulation.
+      //
+      template<class Tuple, class BinaryMetaFun, class StartType>
+      struct tuple_meta_accumulate;
+      
+      template<
+          typename Tuple
+        , class BinaryMetaFun
+        , typename StartType
+      >
+      struct tuple_meta_accumulate_impl
+      {
+         typedef typename mpl::apply2<
+             typename mpl::lambda<BinaryMetaFun>::type
+           , typename Tuple::head_type
+           , typename tuple_meta_accumulate<
+                 typename Tuple::tail_type
+               , BinaryMetaFun
+               , StartType 
+             >::type
+         >::type type;
+      };
+
+      template<
+          typename Tuple
+        , class BinaryMetaFun
+        , typename StartType
+      >
+      struct tuple_meta_accumulate
+        : mpl::eval_if<
+#if BOOST_WORKAROUND(BOOST_MSVC, < 1300)
+              mpl::or_<
+#endif 
+                  boost::is_same<Tuple, tuples::null_type>
+#if BOOST_WORKAROUND(BOOST_MSVC, < 1300)
+                , boost::is_same<Tuple,int>
+              >
+#endif 
+            , mpl::identity<StartType>
+            , tuple_meta_accumulate_impl<
+                  Tuple
+                , BinaryMetaFun
+                , StartType
+              >
+          >
+      {
+      };  
+
+#if defined(BOOST_NO_FUNCTION_TEMPLATE_ORDERING)                            \
+    || (                                                                    \
+      BOOST_WORKAROUND(BOOST_INTEL_CXX_VERSION, != 0) && defined(_MSC_VER)  \
+    )
+// Not sure why intel's partial ordering fails in this case, but I'm
+// assuming int's an MSVC bug-compatibility feature.
+      
+# define BOOST_TUPLE_ALGO_DISPATCH
+# define BOOST_TUPLE_ALGO(algo) algo##_impl
+# define BOOST_TUPLE_ALGO_TERMINATOR , int
+# define BOOST_TUPLE_ALGO_RECURSE , ...
+#else 
+# define BOOST_TUPLE_ALGO(algo) algo
+# define BOOST_TUPLE_ALGO_TERMINATOR
+# define BOOST_TUPLE_ALGO_RECURSE
+#endif
+      
+      // transform algorithm for tuples. The template parameter Fun
+      // must be a unary functor which is also a unary metafunction
+      // class that computes its return type based on its argument
+      // type. For example:
+      //
+      // struct to_ptr
+      // {
+      //     template <class Arg>
+      //     struct apply
+      //     {
+      //          typedef Arg* type;
+      //     }
+      //
+      //     template <class Arg>
+      //     Arg* operator()(Arg x);
+      // };
+      template<typename Fun>
+      tuples::null_type BOOST_TUPLE_ALGO(tuple_transform)
+          (tuples::null_type const&, Fun BOOST_TUPLE_ALGO_TERMINATOR)
+      { return tuples::null_type(); }
+
+      template<typename Tuple, typename Fun>
+      typename tuple_meta_transform<
+          Tuple
+        , Fun
+      >::type
+      
+      BOOST_TUPLE_ALGO(tuple_transform)(
+        const Tuple& t, 
+        Fun f
+        BOOST_TUPLE_ALGO_RECURSE
+      )
+      { 
+          typedef typename tuple_meta_transform<
+              BOOST_DEDUCED_TYPENAME Tuple::tail_type
+            , Fun
+          >::type transformed_tail_type;
+
+        return tuples::cons<
+            BOOST_DEDUCED_TYPENAME mpl::apply1<
+                Fun, BOOST_DEDUCED_TYPENAME Tuple::head_type
+             >::type
+           , transformed_tail_type
+        >( 
+            f(boost::tuples::get<0>(t)), tuple_transform(t.get_tail(), f)
+        );
+      }
+
+#ifdef BOOST_TUPLE_ALGO_DISPATCH
+      template<typename Tuple, typename Fun>
+      typename tuple_meta_transform<
+          Tuple
+        , Fun
+      >::type
+      
+      tuple_transform(
+        const Tuple& t, 
+        Fun f
+      )
+      {
+          return tuple_transform_impl(t, f, 1);
+      }
+#endif
+      
+      // for_each algorithm for tuples.
+      //
+      template<typename Fun>
+      Fun BOOST_TUPLE_ALGO(tuple_for_each)(
+          tuples::null_type
+        , Fun f BOOST_TUPLE_ALGO_TERMINATOR
+      )
+      { return f; }
+
+      
+      template<typename Tuple, typename Fun>
+      Fun BOOST_TUPLE_ALGO(tuple_for_each)(
+          Tuple& t
+        , Fun f BOOST_TUPLE_ALGO_RECURSE)
+      { 
+          f( t.get_head() );
+          return tuple_for_each(t.get_tail(), f);
+      }
+      
+#ifdef BOOST_TUPLE_ALGO_DISPATCH
+      template<typename Tuple, typename Fun>
+      Fun
+      tuple_for_each(
+        Tuple& t, 
+        Fun f
+      )
+      {
+          return tuple_for_each_impl(t, f, 1);
+      }
+#endif
+      
+      // Equality of tuples. NOTE: "==" for tuples currently (7/2003)
+      // has problems under some compilers, so I just do my own.
+      // No point in bringing in a bunch of #ifdefs here. This is
+      // going to go away with the next tuple implementation anyway.
+      //
+      inline bool tuple_equal(tuples::null_type, tuples::null_type)
+      { return true; }
+
+      template<typename Tuple1, typename Tuple2>
+        bool tuple_equal(
+            Tuple1 const& t1, 
+            Tuple2 const& t2
+        )
+      { 
+          return t1.get_head() == t2.get_head() && 
+          tuple_equal(t1.get_tail(), t2.get_tail());
+      }
+    }
+    //
+    // end namespace tuple_impl_specific
+
+    template<typename Iterator>
+    struct iterator_reference
+    {
+        typedef typename iterator_traits<Iterator>::reference type;
+    };
+
+#ifdef BOOST_MPL_CFG_NO_FULL_LAMBDA_SUPPORT
+    // Hack because BOOST_MPL_AUX_LAMBDA_SUPPORT doesn't seem to work
+    // out well.  Instantiating the nested apply template also
+    // requires instantiating iterator_traits on the
+    // placeholder. Instead we just specialize it as a metafunction
+    // class.
+    template<>
+    struct iterator_reference<mpl::_1>
+    {
+        template <class T>
+        struct apply : iterator_reference<T> {};
+    };
+#endif
+    
+    // Metafunction to obtain the type of the tuple whose element types
+    // are the reference types of an iterator tuple.
+    //
+    template<typename IteratorTuple>
+    struct tuple_of_references
+      : tuple_impl_specific::tuple_meta_transform<
+            IteratorTuple, 
+            iterator_reference<mpl::_1>
+          >
+    {
+    };
+
+    // Metafunction to obtain the minimal traversal tag in a tuple
+    // of iterators.
+    //
+    template<typename IteratorTuple>
+    struct minimum_traversal_category_in_iterator_tuple
+    {
+      typedef typename tuple_impl_specific::tuple_meta_transform<
+          IteratorTuple
+        , iterator_traversal<>
+      >::type tuple_of_traversal_tags;
+          
+      typedef typename tuple_impl_specific::tuple_meta_accumulate<
+          tuple_of_traversal_tags
+        , minimum_category<>
+        , random_access_traversal_tag
+      >::type type;
+    };
+
+#if BOOST_WORKAROUND(BOOST_MSVC, < 1300) // ETI workaround
+      template <>
+      struct minimum_traversal_category_in_iterator_tuple<int>
+      {
+          typedef int type;
+      };
+#endif
+      
+      // We need to call tuple_meta_accumulate with mpl::and_ as the
+      // accumulating functor. To this end, we need to wrap it into
+      // a struct that has exactly two arguments (that is, template
+      // parameters) and not five, like mpl::and_ does.
+      //
+      template<typename Arg1, typename Arg2>
+      struct and_with_two_args
+        : mpl::and_<Arg1, Arg2>
+      {
+      };
+    
+# ifdef BOOST_MPL_CFG_NO_FULL_LAMBDA_SUPPORT
+  // Hack because BOOST_MPL_AUX_LAMBDA_SUPPORT doesn't seem to work
+  // out well.  In this case I think it's an MPL bug
+      template<>
+      struct and_with_two_args<mpl::_1,mpl::_2>
+      {
+          template <class A1, class A2>
+          struct apply : mpl::and_<A1,A2>
+          {};
+      };
+# endif 
+
+    ///////////////////////////////////////////////////////////////////
+    //
+    // Class zip_iterator_base
+    //
+    // Builds and exposes the iterator facade type from which the zip 
+    // iterator will be derived.
+    //
+    template<typename IteratorTuple>
+    struct zip_iterator_base
+    {
+     private:
+        // Reference type is the type of the tuple obtained from the
+        // iterators' reference types.
+        typedef typename 
+        detail::tuple_of_references<IteratorTuple>::type reference;
+      
+        // Value type is the same as reference type.
+        typedef reference value_type;
+      
+        // Difference type is the first iterator's difference type
+        typedef typename iterator_traits<
+            typename tuples::element<0, IteratorTuple>::type
+            >::difference_type difference_type;
+      
+        // Traversal catetgory is the minimum traversal category in the 
+        // iterator tuple.
+        typedef typename 
+        detail::minimum_traversal_category_in_iterator_tuple<
+            IteratorTuple
+        >::type traversal_category;
+     public:
+      
+        // The iterator facade type from which the zip iterator will
+        // be derived.
+        typedef iterator_facade<
+            zip_iterator<IteratorTuple>,
+            value_type,  
+            traversal_category,
+            reference,
+            difference_type
+        > type;
+    };
+
+    template <>
+    struct zip_iterator_base<int>
+    {
+        typedef int type;
+    };
+  }
+  
+  /////////////////////////////////////////////////////////////////////
+  //
+  // zip_iterator class definition
+  //
+  template<typename IteratorTuple>
+  class zip_iterator : 
+    public detail::zip_iterator_base<IteratorTuple>::type
+  {  
+
+   // Typedef super_t as our base class. 
+   typedef typename 
+     detail::zip_iterator_base<IteratorTuple>::type super_t;
+
+   // iterator_core_access is the iterator's best friend.
+   friend class iterator_core_access;
+
+  public:
+    
+    // Construction
+    // ============
+    
+    // Default constructor
+    zip_iterator() { }
+
+    // Constructor from iterator tuple
+    zip_iterator(IteratorTuple iterator_tuple) 
+      : m_iterator_tuple(iterator_tuple) 
+    { }
+
+    // Copy constructor
+    template<typename OtherIteratorTuple>
+    zip_iterator(
+       const zip_iterator<OtherIteratorTuple>& other,
+       typename enable_if_convertible<
+         OtherIteratorTuple,
+         IteratorTuple
+         >::type* = 0
+    ) : m_iterator_tuple(other.get_iterator_tuple())
+    {}
+
+    // Get method for the iterator tuple.
+    const IteratorTuple& get_iterator_tuple() const
+    { return m_iterator_tuple; }
+
+  private:
+    
+    // Implementation of Iterator Operations
+    // =====================================
+    
+    // Dereferencing returns a tuple built from the dereferenced
+    // iterators in the iterator tuple.
+    typename super_t::reference dereference() const
+    { 
+      return detail::tuple_impl_specific::tuple_transform( 
+        get_iterator_tuple(),
+        detail::dereference_iterator()
+       );
+    }
+
+    // Two zip iterators are equal if all iterators in the iterator
+    // tuple are equal. NOTE: It should be possible to implement this
+    // as
+    //
+    // return get_iterator_tuple() == other.get_iterator_tuple();
+    //
+    // but equality of tuples currently (7/2003) does not compile
+    // under several compilers. No point in bringing in a bunch
+    // of #ifdefs here.
+    //
+    template<typename OtherIteratorTuple>   
+    bool equal(const zip_iterator<OtherIteratorTuple>& other) const
+    {
+      return detail::tuple_impl_specific::tuple_equal(
+        get_iterator_tuple(),
+        other.get_iterator_tuple()
+        );
+    }
+
+    // Advancing a zip iterator means to advance all iterators in the
+    // iterator tuple.
+    void advance(typename super_t::difference_type n)
+    { 
+      detail::tuple_impl_specific::tuple_for_each(
+          m_iterator_tuple,
+          detail::advance_iterator<BOOST_DEDUCED_TYPENAME super_t::difference_type>(n)
+          );
+    }
+    // Incrementing a zip iterator means to increment all iterators in
+    // the iterator tuple.
+    void increment()
+    { 
+      detail::tuple_impl_specific::tuple_for_each(
+        m_iterator_tuple,
+        detail::increment_iterator()
+        );
+    }
+    
+    // Decrementing a zip iterator means to decrement all iterators in
+    // the iterator tuple.
+    void decrement()
+    { 
+      detail::tuple_impl_specific::tuple_for_each(
+        m_iterator_tuple,
+        detail::decrement_iterator()
+        );
+    }
+    
+    // Distance is calculated using the first iterator in the tuple.
+    template<typename OtherIteratorTuple>
+      typename super_t::difference_type distance_to(
+        const zip_iterator<OtherIteratorTuple>& other
+        ) const
+    { 
+        return boost::tuples::get<0>(other.get_iterator_tuple()) - 
+            boost::tuples::get<0>(this->get_iterator_tuple());
+    }
+  
+    // Data Members
+    // ============
+    
+    // The iterator tuple.
+    IteratorTuple m_iterator_tuple;
+ 
+  };
+
+  // Make function for zip iterator
+  //
+  template<typename IteratorTuple> 
+  zip_iterator<IteratorTuple> 
+  make_zip_iterator(IteratorTuple t)
+  { return zip_iterator<IteratorTuple>(t); }
+
+}
+
+#endif