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00001 // 00002 // placeholders.hpp 00003 // ~~~~~~~~~~~~~~~~ 00004 // 00005 // Copyright (c) 2003-2008 Christopher M. Kohlhoff (chris at kohlhoff dot com) 00006 // 00007 // Distributed under the Boost Software License, Version 1.0. (See accompanying 00008 // file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt) 00009 // 00010 00011 #ifndef ASIO_PLACEHOLDERS_HPP 00012 #define ASIO_PLACEHOLDERS_HPP 00013 00014 #if defined(_MSC_VER) && (_MSC_VER >= 1200) 00015 # pragma once 00016 #endif // defined(_MSC_VER) && (_MSC_VER >= 1200) 00017 00018 #include "asio/detail/push_options.hpp" 00019 00020 #include "asio/detail/push_options.hpp" 00021 #include <boost/bind/arg.hpp> 00022 #include <boost/detail/workaround.hpp> 00023 #include "asio/detail/pop_options.hpp" 00024 00025 namespace asio { 00026 namespace placeholders { 00027 00028 #if defined(GENERATING_DOCUMENTATION) 00029 00032 unspecified error; 00033 00038 unspecified bytes_transferred; 00039 00043 unspecified iterator; 00044 00045 #elif defined(__BORLANDC__) || defined(__GNUC__) 00046 00047 inline boost::arg<1> error() 00048 { 00049 return boost::arg<1>(); 00050 } 00051 00052 inline boost::arg<2> bytes_transferred() 00053 { 00054 return boost::arg<2>(); 00055 } 00056 00057 inline boost::arg<2> iterator() 00058 { 00059 return boost::arg<2>(); 00060 } 00061 00062 #else 00063 00064 namespace detail 00065 { 00066 template <int Number> 00067 struct placeholder 00068 { 00069 static boost::arg<Number>& get() 00070 { 00071 static boost::arg<Number> result; 00072 return result; 00073 } 00074 }; 00075 } 00076 00077 #if BOOST_WORKAROUND(BOOST_MSVC, < 1400) 00078 00079 static boost::arg<1>& error 00080 = asio::placeholders::detail::placeholder<1>::get(); 00081 static boost::arg<2>& bytes_transferred 00082 = asio::placeholders::detail::placeholder<2>::get(); 00083 static boost::arg<2>& iterator 00084 = asio::placeholders::detail::placeholder<2>::get(); 00085 00086 #else 00087 00088 namespace 00089 { 00090 boost::arg<1>& error 00091 = asio::placeholders::detail::placeholder<1>::get(); 00092 boost::arg<2>& bytes_transferred 00093 = asio::placeholders::detail::placeholder<2>::get(); 00094 boost::arg<2>& iterator 00095 = asio::placeholders::detail::placeholder<2>::get(); 00096 } // namespace 00097 00098 #endif 00099 00100 #endif 00101 00102 } // namespace placeholders 00103 } // namespace asio 00104 00105 #include "asio/detail/pop_options.hpp" 00106 00107 #endif // ASIO_PLACEHOLDERS_HPP