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- //
- // detail/handler_type_requirements.hpp
- // ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
- //
- // Copyright (c) 2003-2019 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_DETAIL_HANDLER_TYPE_REQUIREMENTS_HPP
- #define BOOST_ASIO_DETAIL_HANDLER_TYPE_REQUIREMENTS_HPP
- #if defined(_MSC_VER) && (_MSC_VER >= 1200)
- # pragma once
- #endif // defined(_MSC_VER) && (_MSC_VER >= 1200)
- #include <boost/asio/detail/config.hpp>
- // Older versions of gcc have difficulty compiling the sizeof expressions where
- // we test the handler type requirements. We'll disable checking of handler type
- // requirements for those compilers, but otherwise enable it by default.
- #if !defined(BOOST_ASIO_DISABLE_HANDLER_TYPE_REQUIREMENTS)
- # if !defined(__GNUC__) || (__GNUC__ >= 4)
- # define BOOST_ASIO_ENABLE_HANDLER_TYPE_REQUIREMENTS 1
- # endif // !defined(__GNUC__) || (__GNUC__ >= 4)
- #endif // !defined(BOOST_ASIO_DISABLE_HANDLER_TYPE_REQUIREMENTS)
- // With C++0x we can use a combination of enhanced SFINAE and static_assert to
- // generate better template error messages. As this technique is not yet widely
- // portable, we'll only enable it for tested compilers.
- #if !defined(BOOST_ASIO_DISABLE_HANDLER_TYPE_REQUIREMENTS_ASSERT)
- # if defined(__GNUC__)
- # if ((__GNUC__ == 4) && (__GNUC_MINOR__ >= 5)) || (__GNUC__ > 4)
- # if defined(__GXX_EXPERIMENTAL_CXX0X__)
- # define BOOST_ASIO_ENABLE_HANDLER_TYPE_REQUIREMENTS_ASSERT 1
- # endif // defined(__GXX_EXPERIMENTAL_CXX0X__)
- # endif // ((__GNUC__ == 4) && (__GNUC_MINOR__ >= 5)) || (__GNUC__ > 4)
- # endif // defined(__GNUC__)
- # if defined(BOOST_ASIO_MSVC)
- # if (_MSC_VER >= 1600)
- # define BOOST_ASIO_ENABLE_HANDLER_TYPE_REQUIREMENTS_ASSERT 1
- # endif // (_MSC_VER >= 1600)
- # endif // defined(BOOST_ASIO_MSVC)
- # if defined(__clang__)
- # if __has_feature(__cxx_static_assert__)
- # define BOOST_ASIO_ENABLE_HANDLER_TYPE_REQUIREMENTS_ASSERT 1
- # endif // __has_feature(cxx_static_assert)
- # endif // defined(__clang__)
- #endif // !defined(BOOST_ASIO_DISABLE_HANDLER_TYPE_REQUIREMENTS)
- #if defined(BOOST_ASIO_ENABLE_HANDLER_TYPE_REQUIREMENTS)
- # include <boost/asio/async_result.hpp>
- #endif // defined(BOOST_ASIO_ENABLE_HANDLER_TYPE_REQUIREMENTS)
- namespace boost {
- namespace asio {
- namespace detail {
- #if defined(BOOST_ASIO_ENABLE_HANDLER_TYPE_REQUIREMENTS)
- # if defined(BOOST_ASIO_ENABLE_HANDLER_TYPE_REQUIREMENTS_ASSERT)
- template <typename Handler>
- auto zero_arg_copyable_handler_test(Handler h, void*)
- -> decltype(
- sizeof(Handler(static_cast<const Handler&>(h))),
- ((h)()),
- char(0));
- template <typename Handler>
- char (&zero_arg_copyable_handler_test(Handler, ...))[2];
- template <typename Handler, typename Arg1>
- auto one_arg_handler_test(Handler h, Arg1* a1)
- -> decltype(
- sizeof(Handler(BOOST_ASIO_MOVE_CAST(Handler)(h))),
- ((h)(*a1)),
- char(0));
- template <typename Handler>
- char (&one_arg_handler_test(Handler h, ...))[2];
- template <typename Handler, typename Arg1, typename Arg2>
- auto two_arg_handler_test(Handler h, Arg1* a1, Arg2* a2)
- -> decltype(
- sizeof(Handler(BOOST_ASIO_MOVE_CAST(Handler)(h))),
- ((h)(*a1, *a2)),
- char(0));
- template <typename Handler>
- char (&two_arg_handler_test(Handler, ...))[2];
- template <typename Handler, typename Arg1, typename Arg2>
- auto two_arg_move_handler_test(Handler h, Arg1* a1, Arg2* a2)
- -> decltype(
- sizeof(Handler(BOOST_ASIO_MOVE_CAST(Handler)(h))),
- ((h)(*a1, BOOST_ASIO_MOVE_CAST(Arg2)(*a2))),
- char(0));
- template <typename Handler>
- char (&two_arg_move_handler_test(Handler, ...))[2];
- # define BOOST_ASIO_HANDLER_TYPE_REQUIREMENTS_ASSERT(expr, msg) \
- static_assert(expr, msg);
- # else // defined(BOOST_ASIO_ENABLE_HANDLER_TYPE_REQUIREMENTS_ASSERT)
- # define BOOST_ASIO_HANDLER_TYPE_REQUIREMENTS_ASSERT(expr, msg)
- # endif // defined(BOOST_ASIO_ENABLE_HANDLER_TYPE_REQUIREMENTS_ASSERT)
- template <typename T> T& lvref();
- template <typename T> T& lvref(T);
- template <typename T> const T& clvref();
- template <typename T> const T& clvref(T);
- #if defined(BOOST_ASIO_HAS_MOVE)
- template <typename T> T rvref();
- template <typename T> T rvref(T);
- #else // defined(BOOST_ASIO_HAS_MOVE)
- template <typename T> const T& rvref();
- template <typename T> const T& rvref(T);
- #endif // defined(BOOST_ASIO_HAS_MOVE)
- template <typename T> char argbyv(T);
- template <int>
- struct handler_type_requirements
- {
- };
- #define BOOST_ASIO_LEGACY_COMPLETION_HANDLER_CHECK( \
- handler_type, handler) \
- \
- typedef BOOST_ASIO_HANDLER_TYPE(handler_type, \
- void()) asio_true_handler_type; \
- \
- BOOST_ASIO_HANDLER_TYPE_REQUIREMENTS_ASSERT( \
- sizeof(boost::asio::detail::zero_arg_copyable_handler_test( \
- boost::asio::detail::clvref< \
- asio_true_handler_type>(), 0)) == 1, \
- "CompletionHandler type requirements not met") \
- \
- typedef boost::asio::detail::handler_type_requirements< \
- sizeof( \
- boost::asio::detail::argbyv( \
- boost::asio::detail::clvref< \
- asio_true_handler_type>())) + \
- sizeof( \
- boost::asio::detail::lvref< \
- asio_true_handler_type>()(), \
- char(0))> BOOST_ASIO_UNUSED_TYPEDEF
- #define BOOST_ASIO_READ_HANDLER_CHECK( \
- handler_type, handler) \
- \
- typedef BOOST_ASIO_HANDLER_TYPE(handler_type, \
- void(boost::system::error_code, std::size_t)) \
- asio_true_handler_type; \
- \
- BOOST_ASIO_HANDLER_TYPE_REQUIREMENTS_ASSERT( \
- sizeof(boost::asio::detail::two_arg_handler_test( \
- boost::asio::detail::rvref< \
- asio_true_handler_type>(), \
- static_cast<const boost::system::error_code*>(0), \
- static_cast<const std::size_t*>(0))) == 1, \
- "ReadHandler type requirements not met") \
- \
- typedef boost::asio::detail::handler_type_requirements< \
- sizeof( \
- boost::asio::detail::argbyv( \
- boost::asio::detail::rvref< \
- asio_true_handler_type>())) + \
- sizeof( \
- boost::asio::detail::lvref< \
- asio_true_handler_type>()( \
- boost::asio::detail::lvref<const boost::system::error_code>(), \
- boost::asio::detail::lvref<const std::size_t>()), \
- char(0))> BOOST_ASIO_UNUSED_TYPEDEF
- #define BOOST_ASIO_WRITE_HANDLER_CHECK( \
- handler_type, handler) \
- \
- typedef BOOST_ASIO_HANDLER_TYPE(handler_type, \
- void(boost::system::error_code, std::size_t)) \
- asio_true_handler_type; \
- \
- BOOST_ASIO_HANDLER_TYPE_REQUIREMENTS_ASSERT( \
- sizeof(boost::asio::detail::two_arg_handler_test( \
- boost::asio::detail::rvref< \
- asio_true_handler_type>(), \
- static_cast<const boost::system::error_code*>(0), \
- static_cast<const std::size_t*>(0))) == 1, \
- "WriteHandler type requirements not met") \
- \
- typedef boost::asio::detail::handler_type_requirements< \
- sizeof( \
- boost::asio::detail::argbyv( \
- boost::asio::detail::rvref< \
- asio_true_handler_type>())) + \
- sizeof( \
- boost::asio::detail::lvref< \
- asio_true_handler_type>()( \
- boost::asio::detail::lvref<const boost::system::error_code>(), \
- boost::asio::detail::lvref<const std::size_t>()), \
- char(0))> BOOST_ASIO_UNUSED_TYPEDEF
- #define BOOST_ASIO_ACCEPT_HANDLER_CHECK( \
- handler_type, handler) \
- \
- typedef BOOST_ASIO_HANDLER_TYPE(handler_type, \
- void(boost::system::error_code)) \
- asio_true_handler_type; \
- \
- BOOST_ASIO_HANDLER_TYPE_REQUIREMENTS_ASSERT( \
- sizeof(boost::asio::detail::one_arg_handler_test( \
- boost::asio::detail::rvref< \
- asio_true_handler_type>(), \
- static_cast<const boost::system::error_code*>(0))) == 1, \
- "AcceptHandler type requirements not met") \
- \
- typedef boost::asio::detail::handler_type_requirements< \
- sizeof( \
- boost::asio::detail::argbyv( \
- boost::asio::detail::rvref< \
- asio_true_handler_type>())) + \
- sizeof( \
- boost::asio::detail::lvref< \
- asio_true_handler_type>()( \
- boost::asio::detail::lvref<const boost::system::error_code>()), \
- char(0))> BOOST_ASIO_UNUSED_TYPEDEF
- #define BOOST_ASIO_MOVE_ACCEPT_HANDLER_CHECK( \
- handler_type, handler, socket_type) \
- \
- typedef BOOST_ASIO_HANDLER_TYPE(handler_type, \
- void(boost::system::error_code, socket_type)) \
- asio_true_handler_type; \
- \
- BOOST_ASIO_HANDLER_TYPE_REQUIREMENTS_ASSERT( \
- sizeof(boost::asio::detail::two_arg_move_handler_test( \
- boost::asio::detail::rvref< \
- asio_true_handler_type>(), \
- static_cast<const boost::system::error_code*>(0), \
- static_cast<socket_type*>(0))) == 1, \
- "MoveAcceptHandler type requirements not met") \
- \
- typedef boost::asio::detail::handler_type_requirements< \
- sizeof( \
- boost::asio::detail::argbyv( \
- boost::asio::detail::rvref< \
- asio_true_handler_type>())) + \
- sizeof( \
- boost::asio::detail::lvref< \
- asio_true_handler_type>()( \
- boost::asio::detail::lvref<const boost::system::error_code>(), \
- boost::asio::detail::rvref<socket_type>()), \
- char(0))> BOOST_ASIO_UNUSED_TYPEDEF
- #define BOOST_ASIO_CONNECT_HANDLER_CHECK( \
- handler_type, handler) \
- \
- typedef BOOST_ASIO_HANDLER_TYPE(handler_type, \
- void(boost::system::error_code)) \
- asio_true_handler_type; \
- \
- BOOST_ASIO_HANDLER_TYPE_REQUIREMENTS_ASSERT( \
- sizeof(boost::asio::detail::one_arg_handler_test( \
- boost::asio::detail::rvref< \
- asio_true_handler_type>(), \
- static_cast<const boost::system::error_code*>(0))) == 1, \
- "ConnectHandler type requirements not met") \
- \
- typedef boost::asio::detail::handler_type_requirements< \
- sizeof( \
- boost::asio::detail::argbyv( \
- boost::asio::detail::rvref< \
- asio_true_handler_type>())) + \
- sizeof( \
- boost::asio::detail::lvref< \
- asio_true_handler_type>()( \
- boost::asio::detail::lvref<const boost::system::error_code>()), \
- char(0))> BOOST_ASIO_UNUSED_TYPEDEF
- #define BOOST_ASIO_RANGE_CONNECT_HANDLER_CHECK( \
- handler_type, handler, endpoint_type) \
- \
- typedef BOOST_ASIO_HANDLER_TYPE(handler_type, \
- void(boost::system::error_code, endpoint_type)) \
- asio_true_handler_type; \
- \
- BOOST_ASIO_HANDLER_TYPE_REQUIREMENTS_ASSERT( \
- sizeof(boost::asio::detail::two_arg_handler_test( \
- boost::asio::detail::rvref< \
- asio_true_handler_type>(), \
- static_cast<const boost::system::error_code*>(0), \
- static_cast<const endpoint_type*>(0))) == 1, \
- "RangeConnectHandler type requirements not met") \
- \
- typedef boost::asio::detail::handler_type_requirements< \
- sizeof( \
- boost::asio::detail::argbyv( \
- boost::asio::detail::rvref< \
- asio_true_handler_type>())) + \
- sizeof( \
- boost::asio::detail::lvref< \
- asio_true_handler_type>()( \
- boost::asio::detail::lvref<const boost::system::error_code>(), \
- boost::asio::detail::lvref<const endpoint_type>()), \
- char(0))> BOOST_ASIO_UNUSED_TYPEDEF
- #define BOOST_ASIO_ITERATOR_CONNECT_HANDLER_CHECK( \
- handler_type, handler, iter_type) \
- \
- typedef BOOST_ASIO_HANDLER_TYPE(handler_type, \
- void(boost::system::error_code, iter_type)) \
- asio_true_handler_type; \
- \
- BOOST_ASIO_HANDLER_TYPE_REQUIREMENTS_ASSERT( \
- sizeof(boost::asio::detail::two_arg_handler_test( \
- boost::asio::detail::rvref< \
- asio_true_handler_type>(), \
- static_cast<const boost::system::error_code*>(0), \
- static_cast<const iter_type*>(0))) == 1, \
- "IteratorConnectHandler type requirements not met") \
- \
- typedef boost::asio::detail::handler_type_requirements< \
- sizeof( \
- boost::asio::detail::argbyv( \
- boost::asio::detail::rvref< \
- asio_true_handler_type>())) + \
- sizeof( \
- boost::asio::detail::lvref< \
- asio_true_handler_type>()( \
- boost::asio::detail::lvref<const boost::system::error_code>(), \
- boost::asio::detail::lvref<const iter_type>()), \
- char(0))> BOOST_ASIO_UNUSED_TYPEDEF
- #define BOOST_ASIO_RESOLVE_HANDLER_CHECK( \
- handler_type, handler, range_type) \
- \
- typedef BOOST_ASIO_HANDLER_TYPE(handler_type, \
- void(boost::system::error_code, range_type)) \
- asio_true_handler_type; \
- \
- BOOST_ASIO_HANDLER_TYPE_REQUIREMENTS_ASSERT( \
- sizeof(boost::asio::detail::two_arg_handler_test( \
- boost::asio::detail::rvref< \
- asio_true_handler_type>(), \
- static_cast<const boost::system::error_code*>(0), \
- static_cast<const range_type*>(0))) == 1, \
- "ResolveHandler type requirements not met") \
- \
- typedef boost::asio::detail::handler_type_requirements< \
- sizeof( \
- boost::asio::detail::argbyv( \
- boost::asio::detail::rvref< \
- asio_true_handler_type>())) + \
- sizeof( \
- boost::asio::detail::lvref< \
- asio_true_handler_type>()( \
- boost::asio::detail::lvref<const boost::system::error_code>(), \
- boost::asio::detail::lvref<const range_type>()), \
- char(0))> BOOST_ASIO_UNUSED_TYPEDEF
- #define BOOST_ASIO_WAIT_HANDLER_CHECK( \
- handler_type, handler) \
- \
- typedef BOOST_ASIO_HANDLER_TYPE(handler_type, \
- void(boost::system::error_code)) \
- asio_true_handler_type; \
- \
- BOOST_ASIO_HANDLER_TYPE_REQUIREMENTS_ASSERT( \
- sizeof(boost::asio::detail::one_arg_handler_test( \
- boost::asio::detail::rvref< \
- asio_true_handler_type>(), \
- static_cast<const boost::system::error_code*>(0))) == 1, \
- "WaitHandler type requirements not met") \
- \
- typedef boost::asio::detail::handler_type_requirements< \
- sizeof( \
- boost::asio::detail::argbyv( \
- boost::asio::detail::rvref< \
- asio_true_handler_type>())) + \
- sizeof( \
- boost::asio::detail::lvref< \
- asio_true_handler_type>()( \
- boost::asio::detail::lvref<const boost::system::error_code>()), \
- char(0))> BOOST_ASIO_UNUSED_TYPEDEF
- #define BOOST_ASIO_SIGNAL_HANDLER_CHECK( \
- handler_type, handler) \
- \
- typedef BOOST_ASIO_HANDLER_TYPE(handler_type, \
- void(boost::system::error_code, int)) \
- asio_true_handler_type; \
- \
- BOOST_ASIO_HANDLER_TYPE_REQUIREMENTS_ASSERT( \
- sizeof(boost::asio::detail::two_arg_handler_test( \
- boost::asio::detail::rvref< \
- asio_true_handler_type>(), \
- static_cast<const boost::system::error_code*>(0), \
- static_cast<const int*>(0))) == 1, \
- "SignalHandler type requirements not met") \
- \
- typedef boost::asio::detail::handler_type_requirements< \
- sizeof( \
- boost::asio::detail::argbyv( \
- boost::asio::detail::rvref< \
- asio_true_handler_type>())) + \
- sizeof( \
- boost::asio::detail::lvref< \
- asio_true_handler_type>()( \
- boost::asio::detail::lvref<const boost::system::error_code>(), \
- boost::asio::detail::lvref<const int>()), \
- char(0))> BOOST_ASIO_UNUSED_TYPEDEF
- #define BOOST_ASIO_HANDSHAKE_HANDLER_CHECK( \
- handler_type, handler) \
- \
- typedef BOOST_ASIO_HANDLER_TYPE(handler_type, \
- void(boost::system::error_code)) \
- asio_true_handler_type; \
- \
- BOOST_ASIO_HANDLER_TYPE_REQUIREMENTS_ASSERT( \
- sizeof(boost::asio::detail::one_arg_handler_test( \
- boost::asio::detail::rvref< \
- asio_true_handler_type>(), \
- static_cast<const boost::system::error_code*>(0))) == 1, \
- "HandshakeHandler type requirements not met") \
- \
- typedef boost::asio::detail::handler_type_requirements< \
- sizeof( \
- boost::asio::detail::argbyv( \
- boost::asio::detail::rvref< \
- asio_true_handler_type>())) + \
- sizeof( \
- boost::asio::detail::lvref< \
- asio_true_handler_type>()( \
- boost::asio::detail::lvref<const boost::system::error_code>()), \
- char(0))> BOOST_ASIO_UNUSED_TYPEDEF
- #define BOOST_ASIO_BUFFERED_HANDSHAKE_HANDLER_CHECK( \
- handler_type, handler) \
- \
- typedef BOOST_ASIO_HANDLER_TYPE(handler_type, \
- void(boost::system::error_code, std::size_t)) \
- asio_true_handler_type; \
- \
- BOOST_ASIO_HANDLER_TYPE_REQUIREMENTS_ASSERT( \
- sizeof(boost::asio::detail::two_arg_handler_test( \
- boost::asio::detail::rvref< \
- asio_true_handler_type>(), \
- static_cast<const boost::system::error_code*>(0), \
- static_cast<const std::size_t*>(0))) == 1, \
- "BufferedHandshakeHandler type requirements not met") \
- \
- typedef boost::asio::detail::handler_type_requirements< \
- sizeof( \
- boost::asio::detail::argbyv( \
- boost::asio::detail::rvref< \
- asio_true_handler_type>())) + \
- sizeof( \
- boost::asio::detail::lvref< \
- asio_true_handler_type>()( \
- boost::asio::detail::lvref<const boost::system::error_code>(), \
- boost::asio::detail::lvref<const std::size_t>()), \
- char(0))> BOOST_ASIO_UNUSED_TYPEDEF
- #define BOOST_ASIO_SHUTDOWN_HANDLER_CHECK( \
- handler_type, handler) \
- \
- typedef BOOST_ASIO_HANDLER_TYPE(handler_type, \
- void(boost::system::error_code)) \
- asio_true_handler_type; \
- \
- BOOST_ASIO_HANDLER_TYPE_REQUIREMENTS_ASSERT( \
- sizeof(boost::asio::detail::one_arg_handler_test( \
- boost::asio::detail::rvref< \
- asio_true_handler_type>(), \
- static_cast<const boost::system::error_code*>(0))) == 1, \
- "ShutdownHandler type requirements not met") \
- \
- typedef boost::asio::detail::handler_type_requirements< \
- sizeof( \
- boost::asio::detail::argbyv( \
- boost::asio::detail::rvref< \
- asio_true_handler_type>())) + \
- sizeof( \
- boost::asio::detail::lvref< \
- asio_true_handler_type>()( \
- boost::asio::detail::lvref<const boost::system::error_code>()), \
- char(0))> BOOST_ASIO_UNUSED_TYPEDEF
- #else // !defined(BOOST_ASIO_ENABLE_HANDLER_TYPE_REQUIREMENTS)
- #define BOOST_ASIO_LEGACY_COMPLETION_HANDLER_CHECK( \
- handler_type, handler) \
- typedef int BOOST_ASIO_UNUSED_TYPEDEF
- #define BOOST_ASIO_READ_HANDLER_CHECK( \
- handler_type, handler) \
- typedef int BOOST_ASIO_UNUSED_TYPEDEF
- #define BOOST_ASIO_WRITE_HANDLER_CHECK( \
- handler_type, handler) \
- typedef int BOOST_ASIO_UNUSED_TYPEDEF
- #define BOOST_ASIO_ACCEPT_HANDLER_CHECK( \
- handler_type, handler) \
- typedef int BOOST_ASIO_UNUSED_TYPEDEF
- #define BOOST_ASIO_MOVE_ACCEPT_HANDLER_CHECK( \
- handler_type, handler, socket_type) \
- typedef int BOOST_ASIO_UNUSED_TYPEDEF
- #define BOOST_ASIO_CONNECT_HANDLER_CHECK( \
- handler_type, handler) \
- typedef int BOOST_ASIO_UNUSED_TYPEDEF
- #define BOOST_ASIO_RANGE_CONNECT_HANDLER_CHECK( \
- handler_type, handler, iter_type) \
- typedef int BOOST_ASIO_UNUSED_TYPEDEF
- #define BOOST_ASIO_ITERATOR_CONNECT_HANDLER_CHECK( \
- handler_type, handler, iter_type) \
- typedef int BOOST_ASIO_UNUSED_TYPEDEF
- #define BOOST_ASIO_RESOLVE_HANDLER_CHECK( \
- handler_type, handler, iter_type) \
- typedef int BOOST_ASIO_UNUSED_TYPEDEF
- #define BOOST_ASIO_WAIT_HANDLER_CHECK( \
- handler_type, handler) \
- typedef int BOOST_ASIO_UNUSED_TYPEDEF
- #define BOOST_ASIO_SIGNAL_HANDLER_CHECK( \
- handler_type, handler) \
- typedef int BOOST_ASIO_UNUSED_TYPEDEF
- #define BOOST_ASIO_HANDSHAKE_HANDLER_CHECK( \
- handler_type, handler) \
- typedef int BOOST_ASIO_UNUSED_TYPEDEF
- #define BOOST_ASIO_BUFFERED_HANDSHAKE_HANDLER_CHECK( \
- handler_type, handler) \
- typedef int BOOST_ASIO_UNUSED_TYPEDEF
- #define BOOST_ASIO_SHUTDOWN_HANDLER_CHECK( \
- handler_type, handler) \
- typedef int BOOST_ASIO_UNUSED_TYPEDEF
- #endif // !defined(BOOST_ASIO_ENABLE_HANDLER_TYPE_REQUIREMENTS)
- } // namespace detail
- } // namespace asio
- } // namespace boost
- #endif // BOOST_ASIO_DETAIL_HANDLER_TYPE_REQUIREMENTS_HPP
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