1 files changed, 54 insertions, 0 deletions
diff --git a/ext/boost/last_value.hpp b/ext/boost/last_value.hpp
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+++ b/ext/boost/last_value.hpp
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+// last_value function object (documented as part of Boost.Signals)
+
+// Copyright Douglas Gregor 2001-2003. 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)
+
+// For more information, see http://www.boost.org/libs/signals
+
+#ifndef BOOST_LAST_VALUE_HPP
+#define BOOST_LAST_VALUE_HPP
+
+#include <cassert>
+#include <boost/config.hpp>
+
+namespace boost {
+  template<typename T>
+  struct last_value {
+    typedef T result_type;
+
+    template<typename InputIterator>
+    T operator()(InputIterator first, InputIterator last) const
+    {
+      assert(first != last);
+      T value = *first++;
+      while (first != last)
+        value = *first++;
+      return value;
+    }
+  };
+
+  template<>
+  struct last_value<void> {
+#ifdef BOOST_NO_VOID_RETURNS
+    struct unusable {};
+
+  public:
+    typedef unusable result_type;
+#else
+  public:
+    typedef void result_type;
+#endif // BOOST_NO_VOID_RETURNS
+
+    template<typename InputIterator>
+    result_type
+    operator()(InputIterator first, InputIterator last) const
+    {
+      while (first != last)
+        *first++;
+      return result_type();
+    }
+  };
+}
+#endif // BOOST_SIGNALS_LAST_VALUE_HPP