| // |
| // detail/handler_type_requirements.hpp |
| // ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ |
| // |
| // Copyright (c) 2003-2011 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_DETAIL_HANDLER_TYPE_REQUIREMENTS_HPP |
| #define ASIO_DETAIL_HANDLER_TYPE_REQUIREMENTS_HPP |
| |
| #if defined(_MSC_VER) && (_MSC_VER >= 1200) |
| # pragma once |
| #endif // defined(_MSC_VER) && (_MSC_VER >= 1200) |
| |
| #include "asio/detail/config.hpp" |
| |
| namespace asio { |
| namespace detail { |
| |
| // 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(ASIO_DISABLE_HANDLER_TYPE_REQUIREMENTS) |
| # if !defined(__GNUC__) || (__GNUC__ >= 4) |
| # define ASIO_ENABLE_HANDLER_TYPE_REQUIREMENTS 1 |
| # endif // !defined(__GNUC__) || (__GNUC__ >= 4) |
| #endif // !defined(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(ASIO_DISABLE_HANDLER_TYPE_REQUIREMENTS_ASSERT) |
| # if defined(__GNUC__) |
| # if ((__GNUC__ == 4) && (__GNUC_MINOR__ >= 5)) || (__GNUC__ > 4) |
| # if defined(__GXX_EXPERIMENTAL_CXX0X__) |
| # define 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_MSVC) |
| # if (_MSC_VER >= 1600) |
| # define ASIO_ENABLE_HANDLER_TYPE_REQUIREMENTS_ASSERT 1 |
| # endif // (_MSC_VER >= 1600) |
| # endif // defined(BOOST_MSVC) |
| #endif // !defined(ASIO_DISABLE_HANDLER_TYPE_REQUIREMENTS) |
| |
| #if defined(ASIO_ENABLE_HANDLER_TYPE_REQUIREMENTS) |
| |
| # if defined(ASIO_ENABLE_HANDLER_TYPE_REQUIREMENTS_ASSERT) |
| |
| template <typename Handler> |
| auto zero_arg_handler_test(Handler* h) |
| -> decltype( |
| sizeof(Handler(*static_cast<const Handler*>(h))), |
| ((*h)()), |
| char(0)); |
| |
| char (&zero_arg_handler_test(...))[2]; |
| |
| template <typename Handler, typename Arg1> |
| auto one_arg_handler_test(Handler* h, Arg1* a1) |
| -> decltype( |
| sizeof(Handler(*static_cast<const Handler*>(h))), |
| ((*h)(*a1)), |
| char(0)); |
| |
| char (&one_arg_handler_test(...))[2]; |
| |
| template <typename Handler, typename Arg1, typename Arg2> |
| auto two_arg_handler_test(Handler* h, Arg1* a1, Arg2* a2) |
| -> decltype( |
| sizeof(Handler(*static_cast<const Handler*>(h))), |
| ((*h)(*a1, *a2)), |
| char(0)); |
| |
| char (&two_arg_handler_test(...))[2]; |
| |
| # define ASIO_HANDLER_TYPE_REQUIREMENTS_ASSERT(expr, msg) \ |
| static_assert(expr, msg); |
| |
| # else // defined(ASIO_ENABLE_HANDLER_TYPE_REQUIREMENTS_ASSERT) |
| |
| # define ASIO_HANDLER_TYPE_REQUIREMENTS_ASSERT(expr, msg) |
| |
| # endif // defined(ASIO_ENABLE_HANDLER_TYPE_REQUIREMENTS_ASSERT) |
| |
| template <typename T> T& lvref(); |
| |
| template <int> |
| struct handler_type_requirements |
| { |
| }; |
| |
| #define ASIO_COMPLETION_HANDLER_CHECK( \ |
| handler_type, handler) \ |
| \ |
| ASIO_HANDLER_TYPE_REQUIREMENTS_ASSERT( \ |
| sizeof(asio::detail::zero_arg_handler_test( \ |
| static_cast<handler_type*>(0))) == 1, \ |
| "CompletionHandler type requirements not met") \ |
| \ |
| typedef asio::detail::handler_type_requirements< \ |
| sizeof( \ |
| handler_type( \ |
| static_cast<const handler_type&>(handler))) + \ |
| sizeof( \ |
| handler(), \ |
| char(0))> |
| |
| #define ASIO_READ_HANDLER_CHECK( \ |
| handler_type, handler) \ |
| \ |
| ASIO_HANDLER_TYPE_REQUIREMENTS_ASSERT( \ |
| sizeof(asio::detail::two_arg_handler_test( \ |
| static_cast<handler_type*>(0), \ |
| static_cast<const asio::error_code*>(0), \ |
| static_cast<const std::size_t*>(0))) == 1, \ |
| "ReadHandler type requirements not met") \ |
| \ |
| typedef asio::detail::handler_type_requirements< \ |
| sizeof( \ |
| handler_type( \ |
| static_cast<const handler_type&>(handler))) + \ |
| sizeof( \ |
| handler( \ |
| asio::detail::lvref<const asio::error_code>(), \ |
| asio::detail::lvref<const std::size_t>()), \ |
| char(0))> |
| |
| #define ASIO_WRITE_HANDLER_CHECK( \ |
| handler_type, handler) \ |
| \ |
| ASIO_HANDLER_TYPE_REQUIREMENTS_ASSERT( \ |
| sizeof(asio::detail::two_arg_handler_test( \ |
| static_cast<handler_type*>(0), \ |
| static_cast<const asio::error_code*>(0), \ |
| static_cast<const std::size_t*>(0))) == 1, \ |
| "WriteHandler type requirements not met") \ |
| \ |
| typedef asio::detail::handler_type_requirements< \ |
| sizeof( \ |
| handler_type( \ |
| static_cast<const handler_type&>(handler))) + \ |
| sizeof( \ |
| handler( \ |
| asio::detail::lvref<const asio::error_code>(), \ |
| asio::detail::lvref<const std::size_t>()), \ |
| char(0))> |
| |
| #define ASIO_ACCEPT_HANDLER_CHECK( \ |
| handler_type, handler) \ |
| \ |
| ASIO_HANDLER_TYPE_REQUIREMENTS_ASSERT( \ |
| sizeof(asio::detail::one_arg_handler_test( \ |
| static_cast<handler_type*>(0), \ |
| static_cast<const asio::error_code*>(0))) == 1, \ |
| "AcceptHandler type requirements not met") \ |
| \ |
| typedef asio::detail::handler_type_requirements< \ |
| sizeof( \ |
| handler_type( \ |
| static_cast<const handler_type&>(handler))) + \ |
| sizeof( \ |
| handler( \ |
| asio::detail::lvref<const asio::error_code>()), \ |
| char(0))> |
| |
| #define ASIO_CONNECT_HANDLER_CHECK( \ |
| handler_type, handler) \ |
| \ |
| ASIO_HANDLER_TYPE_REQUIREMENTS_ASSERT( \ |
| sizeof(asio::detail::one_arg_handler_test( \ |
| static_cast<handler_type*>(0), \ |
| static_cast<const asio::error_code*>(0))) == 1, \ |
| "ConnectHandler type requirements not met") \ |
| \ |
| typedef asio::detail::handler_type_requirements< \ |
| sizeof( \ |
| handler_type( \ |
| static_cast<const handler_type&>(handler))) + \ |
| sizeof( \ |
| handler( \ |
| asio::detail::lvref<const asio::error_code>()), \ |
| char(0))> |
| |
| #define ASIO_COMPOSED_CONNECT_HANDLER_CHECK( \ |
| handler_type, handler, iter_type) \ |
| \ |
| ASIO_HANDLER_TYPE_REQUIREMENTS_ASSERT( \ |
| sizeof(asio::detail::two_arg_handler_test( \ |
| static_cast<handler_type*>(0), \ |
| static_cast<const asio::error_code*>(0), \ |
| static_cast<const iter_type*>(0))) == 1, \ |
| "ComposedConnectHandler type requirements not met") \ |
| \ |
| typedef asio::detail::handler_type_requirements< \ |
| sizeof( \ |
| handler_type( \ |
| static_cast<const handler_type&>(handler))) + \ |
| sizeof( \ |
| handler( \ |
| asio::detail::lvref<const asio::error_code>(), \ |
| asio::detail::lvref<const iter_type>()), \ |
| char(0))> |
| |
| #define ASIO_RESOLVE_HANDLER_CHECK( \ |
| handler_type, handler, iter_type) \ |
| \ |
| ASIO_HANDLER_TYPE_REQUIREMENTS_ASSERT( \ |
| sizeof(asio::detail::two_arg_handler_test( \ |
| static_cast<handler_type*>(0), \ |
| static_cast<const asio::error_code*>(0), \ |
| static_cast<const iter_type*>(0))) == 1, \ |
| "ResolveHandler type requirements not met") \ |
| \ |
| typedef asio::detail::handler_type_requirements< \ |
| sizeof( \ |
| handler_type( \ |
| static_cast<const handler_type&>(handler))) + \ |
| sizeof( \ |
| handler( \ |
| asio::detail::lvref<const asio::error_code>(), \ |
| asio::detail::lvref<const iter_type>()), \ |
| char(0))> |
| |
| #define ASIO_WAIT_HANDLER_CHECK( \ |
| handler_type, handler) \ |
| \ |
| ASIO_HANDLER_TYPE_REQUIREMENTS_ASSERT( \ |
| sizeof(asio::detail::one_arg_handler_test( \ |
| static_cast<handler_type*>(0), \ |
| static_cast<const asio::error_code*>(0))) == 1, \ |
| "WaitHandler type requirements not met") \ |
| \ |
| typedef asio::detail::handler_type_requirements< \ |
| sizeof( \ |
| handler_type( \ |
| static_cast<const handler_type&>(handler))) + \ |
| sizeof( \ |
| handler( \ |
| asio::detail::lvref<const asio::error_code>()), \ |
| char(0))> |
| |
| #define ASIO_SIGNAL_HANDLER_CHECK( \ |
| handler_type, handler) \ |
| \ |
| ASIO_HANDLER_TYPE_REQUIREMENTS_ASSERT( \ |
| sizeof(asio::detail::two_arg_handler_test( \ |
| static_cast<handler_type*>(0), \ |
| static_cast<const asio::error_code*>(0), \ |
| static_cast<const int*>(0))) == 1, \ |
| "SignalHandler type requirements not met") \ |
| \ |
| typedef asio::detail::handler_type_requirements< \ |
| sizeof( \ |
| handler_type( \ |
| static_cast<const handler_type&>(handler))) + \ |
| sizeof( \ |
| handler( \ |
| asio::detail::lvref<const asio::error_code>(), \ |
| asio::detail::lvref<const int>()), \ |
| char(0))> |
| |
| #define ASIO_HANDSHAKE_HANDLER_CHECK( \ |
| handler_type, handler) \ |
| \ |
| ASIO_HANDLER_TYPE_REQUIREMENTS_ASSERT( \ |
| sizeof(asio::detail::one_arg_handler_test( \ |
| static_cast<handler_type*>(0), \ |
| static_cast<const asio::error_code*>(0))) == 1, \ |
| "HandshakeHandler type requirements not met") \ |
| \ |
| typedef asio::detail::handler_type_requirements< \ |
| sizeof( \ |
| handler_type( \ |
| static_cast<const handler_type&>(handler))) + \ |
| sizeof( \ |
| handler( \ |
| asio::detail::lvref<const asio::error_code>()), \ |
| char(0))> |
| |
| #define ASIO_SHUTDOWN_HANDLER_CHECK( \ |
| handler_type, handler) \ |
| \ |
| ASIO_HANDLER_TYPE_REQUIREMENTS_ASSERT( \ |
| sizeof(asio::detail::one_arg_handler_test( \ |
| static_cast<handler_type*>(0), \ |
| static_cast<const asio::error_code*>(0))) == 1, \ |
| "ShutdownHandler type requirements not met") \ |
| \ |
| typedef asio::detail::handler_type_requirements< \ |
| sizeof( \ |
| handler_type( \ |
| static_cast<const handler_type&>(handler))) + \ |
| sizeof( \ |
| handler( \ |
| asio::detail::lvref<const asio::error_code>()), \ |
| char(0))> |
| |
| #else // !defined(ASIO_ENABLE_HANDLER_TYPE_REQUIREMENTS) |
| |
| #define ASIO_COMPLETION_HANDLER_CHECK( \ |
| handler_type, handler) \ |
| typedef int |
| |
| #define ASIO_READ_HANDLER_CHECK( \ |
| handler_type, handler) \ |
| typedef int |
| |
| #define ASIO_WRITE_HANDLER_CHECK( \ |
| handler_type, handler) \ |
| typedef int |
| |
| #define ASIO_ACCEPT_HANDLER_CHECK( \ |
| handler_type, handler) \ |
| typedef int |
| |
| #define ASIO_CONNECT_HANDLER_CHECK( \ |
| handler_type, handler) \ |
| typedef int |
| |
| #define ASIO_COMPOSED_CONNECT_HANDLER_CHECK( \ |
| handler_type, handler, iter_type) \ |
| typedef int |
| |
| #define ASIO_RESOLVE_HANDLER_CHECK( \ |
| handler_type, handler, iter_type) \ |
| typedef int |
| |
| #define ASIO_WAIT_HANDLER_CHECK( \ |
| handler_type, handler) \ |
| typedef int |
| |
| #define ASIO_SIGNAL_HANDLER_CHECK( \ |
| handler_type, handler) \ |
| typedef int |
| |
| #define ASIO_HANDSHAKE_HANDLER_CHECK( \ |
| handler_type, handler) \ |
| typedef int |
| |
| #define ASIO_SHUTDOWN_HANDLER_CHECK( \ |
| handler_type, handler) \ |
| typedef int |
| |
| #endif // !defined(ASIO_ENABLE_HANDLER_TYPE_REQUIREMENTS) |
| |
| } // namespace detail |
| } // namespace asio |
| |
| #endif // ASIO_DETAIL_HANDLER_TYPE_REQUIREMENTS_HPP |