// // placeholders.hpp // ~~~~~~~~~~~~~~~~ // // Copyright (c) 2003-2008 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 BOOST_ASIO_PLACEHOLDERS_HPP #define BOOST_ASIO_PLACEHOLDERS_HPP #if defined(_MSC_VER) && (_MSC_VER >= 1200) # pragma once #endif // defined(_MSC_VER) && (_MSC_VER >= 1200) #include <boost/asio/detail/push_options.hpp> #include <boost/asio/detail/push_options.hpp> #include <boost/bind/arg.hpp> #include <boost/detail/workaround.hpp> #include <boost/asio/detail/pop_options.hpp> namespace boost { 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 boost::asio::basic_stream_socket::async_write_some or /// boost::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 /// boost::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 = boost::asio::placeholders::detail::placeholder<1>::get(); static boost::arg<2>& bytes_transferred = boost::asio::placeholders::detail::placeholder<2>::get(); static boost::arg<2>& iterator = boost::asio::placeholders::detail::placeholder<2>::get(); #else namespace { boost::arg<1>& error = boost::asio::placeholders::detail::placeholder<1>::get(); boost::arg<2>& bytes_transferred = boost::asio::placeholders::detail::placeholder<2>::get(); boost::arg<2>& iterator = boost::asio::placeholders::detail::placeholder<2>::get(); } // namespace #endif #endif } // namespace placeholders } // namespace asio } // namespace boost #include <boost/asio/detail/pop_options.hpp> #endif // BOOST_ASIO_PLACEHOLDERS_HPP