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//
// placeholders.hpp
// ~~~~~~~~~~~~~~~~
//
// Copyright (c) 2003-2010 Christopher M. Kohlhoff (chris at kohlhoff dot com)
//
// 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 ASIO_PLACEHOLDERS_HPP
#define ASIO_PLACEHOLDERS_HPP
#if defined(_MSC_VER) && (_MSC_VER >= 1200)
# pragma once
#endif // defined(_MSC_VER) && (_MSC_VER >= 1200)
#include "asio/detail/push_options.hpp"
#include "asio/detail/push_options.hpp"
#include <boost/bind/arg.hpp>
#include <boost/detail/workaround.hpp>
#include "asio/detail/pop_options.hpp"
namespace asio {
namespace placeholders {
#if defined(GENERATING_DOCUMENTATION)
/// An argument placeholder, for use with boost::bind(), that corresponds to
/// the error argument of a handler for any of the asynchronous functions.
unspecified error;
/// An argument placeholder, for use with boost::bind(), that corresponds to
/// the bytes_transferred argument of a handler for asynchronous functions such
/// as asio::basic_stream_socket::async_write_some or
/// asio::async_write.
unspecified bytes_transferred;
/// An argument placeholder, for use with boost::bind(), that corresponds to
/// the iterator argument of a handler for asynchronous functions such as
/// asio::basic_resolver::resolve.
unspecified iterator;
#elif defined(__BORLANDC__) || defined(__GNUC__)
inline boost::arg<1> error()
{
return boost::arg<1>();
}
inline boost::arg<2> bytes_transferred()
{
return boost::arg<2>();
}
inline boost::arg<2> iterator()
{
return boost::arg<2>();
}
#else
namespace detail
{
template <int Number>
struct placeholder
{
static boost::arg<Number>& get()
{
static boost::arg<Number> result;
return result;
}
};
}
#if BOOST_WORKAROUND(BOOST_MSVC, < 1400)
static boost::arg<1>& error
= asio::placeholders::detail::placeholder<1>::get();
static boost::arg<2>& bytes_transferred
= asio::placeholders::detail::placeholder<2>::get();
static boost::arg<2>& iterator
= asio::placeholders::detail::placeholder<2>::get();
#else
namespace
{
boost::arg<1>& error
= asio::placeholders::detail::placeholder<1>::get();
boost::arg<2>& bytes_transferred
= asio::placeholders::detail::placeholder<2>::get();
boost::arg<2>& iterator
= asio::placeholders::detail::placeholder<2>::get();
} // namespace
#endif
#endif
} // namespace placeholders
} // namespace asio
#include "asio/detail/pop_options.hpp"
#endif // ASIO_PLACEHOLDERS_HPP
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