557 lines
18 KiB
C++
557 lines
18 KiB
C++
//
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// detail/handler_type_requirements.hpp
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// ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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//
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// Copyright (c) 2003-2021 Christopher M. Kohlhoff (chris at kohlhoff dot com)
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//
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// Distributed under the Boost Software License, Version 1.0. (See accompanying
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// file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
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//
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#ifndef ASIO_DETAIL_HANDLER_TYPE_REQUIREMENTS_HPP
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#define ASIO_DETAIL_HANDLER_TYPE_REQUIREMENTS_HPP
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#if defined(_MSC_VER) && (_MSC_VER >= 1200)
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# pragma once
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#endif // defined(_MSC_VER) && (_MSC_VER >= 1200)
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#include "asio/detail/config.hpp"
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// Older versions of gcc have difficulty compiling the sizeof expressions where
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// we test the handler type requirements. We'll disable checking of handler type
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// requirements for those compilers, but otherwise enable it by default.
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#if !defined(ASIO_DISABLE_HANDLER_TYPE_REQUIREMENTS)
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# if !defined(__GNUC__) || (__GNUC__ >= 4)
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# define ASIO_ENABLE_HANDLER_TYPE_REQUIREMENTS 1
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# endif // !defined(__GNUC__) || (__GNUC__ >= 4)
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#endif // !defined(ASIO_DISABLE_HANDLER_TYPE_REQUIREMENTS)
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// With C++0x we can use a combination of enhanced SFINAE and static_assert to
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// generate better template error messages. As this technique is not yet widely
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// portable, we'll only enable it for tested compilers.
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#if !defined(ASIO_DISABLE_HANDLER_TYPE_REQUIREMENTS_ASSERT)
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# if defined(__GNUC__)
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# if ((__GNUC__ == 4) && (__GNUC_MINOR__ >= 5)) || (__GNUC__ > 4)
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# if defined(__GXX_EXPERIMENTAL_CXX0X__)
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# define ASIO_ENABLE_HANDLER_TYPE_REQUIREMENTS_ASSERT 1
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# endif // defined(__GXX_EXPERIMENTAL_CXX0X__)
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# endif // ((__GNUC__ == 4) && (__GNUC_MINOR__ >= 5)) || (__GNUC__ > 4)
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# endif // defined(__GNUC__)
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# if defined(ASIO_MSVC)
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# if (_MSC_VER >= 1600)
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# define ASIO_ENABLE_HANDLER_TYPE_REQUIREMENTS_ASSERT 1
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# endif // (_MSC_VER >= 1600)
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# endif // defined(ASIO_MSVC)
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# if defined(__clang__)
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# if __has_feature(__cxx_static_assert__)
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# define ASIO_ENABLE_HANDLER_TYPE_REQUIREMENTS_ASSERT 1
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# endif // __has_feature(cxx_static_assert)
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# endif // defined(__clang__)
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#endif // !defined(ASIO_DISABLE_HANDLER_TYPE_REQUIREMENTS)
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#if defined(ASIO_ENABLE_HANDLER_TYPE_REQUIREMENTS)
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# include "asio/async_result.hpp"
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#endif // defined(ASIO_ENABLE_HANDLER_TYPE_REQUIREMENTS)
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namespace asio {
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namespace detail {
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#if defined(ASIO_ENABLE_HANDLER_TYPE_REQUIREMENTS)
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# if defined(ASIO_ENABLE_HANDLER_TYPE_REQUIREMENTS_ASSERT)
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template <typename Handler>
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auto zero_arg_copyable_handler_test(Handler h, void*)
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-> decltype(
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sizeof(Handler(static_cast<const Handler&>(h))),
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((h)()),
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char(0));
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template <typename Handler>
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char (&zero_arg_copyable_handler_test(Handler, ...))[2];
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template <typename Handler, typename Arg1>
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auto one_arg_handler_test(Handler h, Arg1* a1)
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-> decltype(
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sizeof(Handler(ASIO_MOVE_CAST(Handler)(h))),
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((h)(*a1)),
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char(0));
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template <typename Handler>
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char (&one_arg_handler_test(Handler h, ...))[2];
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template <typename Handler, typename Arg1, typename Arg2>
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auto two_arg_handler_test(Handler h, Arg1* a1, Arg2* a2)
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-> decltype(
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sizeof(Handler(ASIO_MOVE_CAST(Handler)(h))),
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((h)(*a1, *a2)),
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char(0));
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template <typename Handler>
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char (&two_arg_handler_test(Handler, ...))[2];
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template <typename Handler, typename Arg1, typename Arg2>
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auto two_arg_move_handler_test(Handler h, Arg1* a1, Arg2* a2)
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-> decltype(
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sizeof(Handler(ASIO_MOVE_CAST(Handler)(h))),
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((h)(*a1, ASIO_MOVE_CAST(Arg2)(*a2))),
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char(0));
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template <typename Handler>
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char (&two_arg_move_handler_test(Handler, ...))[2];
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# define ASIO_HANDLER_TYPE_REQUIREMENTS_ASSERT(expr, msg) \
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static_assert(expr, msg);
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# else // defined(ASIO_ENABLE_HANDLER_TYPE_REQUIREMENTS_ASSERT)
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# define ASIO_HANDLER_TYPE_REQUIREMENTS_ASSERT(expr, msg)
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# endif // defined(ASIO_ENABLE_HANDLER_TYPE_REQUIREMENTS_ASSERT)
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template <typename T> T& lvref();
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template <typename T> T& lvref(T);
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template <typename T> const T& clvref();
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template <typename T> const T& clvref(T);
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#if defined(ASIO_HAS_MOVE)
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template <typename T> T rvref();
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template <typename T> T rvref(T);
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#else // defined(ASIO_HAS_MOVE)
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template <typename T> const T& rvref();
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template <typename T> const T& rvref(T);
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#endif // defined(ASIO_HAS_MOVE)
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template <typename T> char argbyv(T);
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template <int>
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struct handler_type_requirements
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{
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};
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#define ASIO_LEGACY_COMPLETION_HANDLER_CHECK( \
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handler_type, handler) \
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\
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typedef ASIO_HANDLER_TYPE(handler_type, \
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void()) asio_true_handler_type; \
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\
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ASIO_HANDLER_TYPE_REQUIREMENTS_ASSERT( \
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sizeof(asio::detail::zero_arg_copyable_handler_test( \
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asio::detail::clvref< \
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asio_true_handler_type>(), 0)) == 1, \
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"CompletionHandler type requirements not met") \
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\
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typedef asio::detail::handler_type_requirements< \
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sizeof( \
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asio::detail::argbyv( \
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asio::detail::clvref< \
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asio_true_handler_type>())) + \
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sizeof( \
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asio::detail::lvref< \
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asio_true_handler_type>()(), \
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char(0))> ASIO_UNUSED_TYPEDEF
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#define ASIO_READ_HANDLER_CHECK( \
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handler_type, handler) \
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\
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typedef ASIO_HANDLER_TYPE(handler_type, \
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void(asio::error_code, std::size_t)) \
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asio_true_handler_type; \
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\
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ASIO_HANDLER_TYPE_REQUIREMENTS_ASSERT( \
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sizeof(asio::detail::two_arg_handler_test( \
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asio::detail::rvref< \
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asio_true_handler_type>(), \
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static_cast<const asio::error_code*>(0), \
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static_cast<const std::size_t*>(0))) == 1, \
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"ReadHandler type requirements not met") \
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\
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typedef asio::detail::handler_type_requirements< \
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sizeof( \
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asio::detail::argbyv( \
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asio::detail::rvref< \
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asio_true_handler_type>())) + \
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sizeof( \
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asio::detail::lvref< \
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asio_true_handler_type>()( \
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asio::detail::lvref<const asio::error_code>(), \
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asio::detail::lvref<const std::size_t>()), \
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char(0))> ASIO_UNUSED_TYPEDEF
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#define ASIO_WRITE_HANDLER_CHECK( \
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handler_type, handler) \
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\
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typedef ASIO_HANDLER_TYPE(handler_type, \
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void(asio::error_code, std::size_t)) \
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asio_true_handler_type; \
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\
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ASIO_HANDLER_TYPE_REQUIREMENTS_ASSERT( \
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sizeof(asio::detail::two_arg_handler_test( \
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asio::detail::rvref< \
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asio_true_handler_type>(), \
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static_cast<const asio::error_code*>(0), \
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static_cast<const std::size_t*>(0))) == 1, \
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"WriteHandler type requirements not met") \
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\
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typedef asio::detail::handler_type_requirements< \
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sizeof( \
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asio::detail::argbyv( \
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asio::detail::rvref< \
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asio_true_handler_type>())) + \
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sizeof( \
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asio::detail::lvref< \
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asio_true_handler_type>()( \
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asio::detail::lvref<const asio::error_code>(), \
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asio::detail::lvref<const std::size_t>()), \
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char(0))> ASIO_UNUSED_TYPEDEF
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#define ASIO_ACCEPT_HANDLER_CHECK( \
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handler_type, handler) \
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\
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typedef ASIO_HANDLER_TYPE(handler_type, \
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void(asio::error_code)) \
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asio_true_handler_type; \
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\
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ASIO_HANDLER_TYPE_REQUIREMENTS_ASSERT( \
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sizeof(asio::detail::one_arg_handler_test( \
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asio::detail::rvref< \
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asio_true_handler_type>(), \
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static_cast<const asio::error_code*>(0))) == 1, \
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"AcceptHandler type requirements not met") \
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\
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typedef asio::detail::handler_type_requirements< \
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sizeof( \
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asio::detail::argbyv( \
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asio::detail::rvref< \
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asio_true_handler_type>())) + \
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sizeof( \
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asio::detail::lvref< \
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asio_true_handler_type>()( \
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asio::detail::lvref<const asio::error_code>()), \
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char(0))> ASIO_UNUSED_TYPEDEF
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#define ASIO_MOVE_ACCEPT_HANDLER_CHECK( \
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handler_type, handler, socket_type) \
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\
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typedef ASIO_HANDLER_TYPE(handler_type, \
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void(asio::error_code, socket_type)) \
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asio_true_handler_type; \
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\
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ASIO_HANDLER_TYPE_REQUIREMENTS_ASSERT( \
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sizeof(asio::detail::two_arg_move_handler_test( \
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asio::detail::rvref< \
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asio_true_handler_type>(), \
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static_cast<const asio::error_code*>(0), \
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static_cast<socket_type*>(0))) == 1, \
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"MoveAcceptHandler type requirements not met") \
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\
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typedef asio::detail::handler_type_requirements< \
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sizeof( \
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asio::detail::argbyv( \
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asio::detail::rvref< \
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asio_true_handler_type>())) + \
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sizeof( \
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asio::detail::lvref< \
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asio_true_handler_type>()( \
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asio::detail::lvref<const asio::error_code>(), \
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asio::detail::rvref<socket_type>()), \
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char(0))> ASIO_UNUSED_TYPEDEF
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#define ASIO_CONNECT_HANDLER_CHECK( \
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handler_type, handler) \
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\
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typedef ASIO_HANDLER_TYPE(handler_type, \
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void(asio::error_code)) \
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asio_true_handler_type; \
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\
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ASIO_HANDLER_TYPE_REQUIREMENTS_ASSERT( \
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sizeof(asio::detail::one_arg_handler_test( \
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asio::detail::rvref< \
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asio_true_handler_type>(), \
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static_cast<const asio::error_code*>(0))) == 1, \
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"ConnectHandler type requirements not met") \
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\
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typedef asio::detail::handler_type_requirements< \
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sizeof( \
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asio::detail::argbyv( \
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asio::detail::rvref< \
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asio_true_handler_type>())) + \
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sizeof( \
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asio::detail::lvref< \
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asio_true_handler_type>()( \
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asio::detail::lvref<const asio::error_code>()), \
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char(0))> ASIO_UNUSED_TYPEDEF
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#define ASIO_RANGE_CONNECT_HANDLER_CHECK( \
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handler_type, handler, endpoint_type) \
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\
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typedef ASIO_HANDLER_TYPE(handler_type, \
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void(asio::error_code, endpoint_type)) \
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asio_true_handler_type; \
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\
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ASIO_HANDLER_TYPE_REQUIREMENTS_ASSERT( \
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sizeof(asio::detail::two_arg_handler_test( \
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asio::detail::rvref< \
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asio_true_handler_type>(), \
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static_cast<const asio::error_code*>(0), \
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static_cast<const endpoint_type*>(0))) == 1, \
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"RangeConnectHandler type requirements not met") \
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\
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typedef asio::detail::handler_type_requirements< \
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sizeof( \
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asio::detail::argbyv( \
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asio::detail::rvref< \
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asio_true_handler_type>())) + \
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sizeof( \
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asio::detail::lvref< \
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asio_true_handler_type>()( \
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asio::detail::lvref<const asio::error_code>(), \
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asio::detail::lvref<const endpoint_type>()), \
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char(0))> ASIO_UNUSED_TYPEDEF
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#define ASIO_ITERATOR_CONNECT_HANDLER_CHECK( \
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handler_type, handler, iter_type) \
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\
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typedef ASIO_HANDLER_TYPE(handler_type, \
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void(asio::error_code, iter_type)) \
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asio_true_handler_type; \
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\
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ASIO_HANDLER_TYPE_REQUIREMENTS_ASSERT( \
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sizeof(asio::detail::two_arg_handler_test( \
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asio::detail::rvref< \
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asio_true_handler_type>(), \
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static_cast<const asio::error_code*>(0), \
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static_cast<const iter_type*>(0))) == 1, \
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"IteratorConnectHandler type requirements not met") \
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\
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typedef asio::detail::handler_type_requirements< \
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sizeof( \
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asio::detail::argbyv( \
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asio::detail::rvref< \
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asio_true_handler_type>())) + \
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sizeof( \
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asio::detail::lvref< \
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asio_true_handler_type>()( \
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asio::detail::lvref<const asio::error_code>(), \
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asio::detail::lvref<const iter_type>()), \
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char(0))> ASIO_UNUSED_TYPEDEF
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#define ASIO_RESOLVE_HANDLER_CHECK( \
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handler_type, handler, range_type) \
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\
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typedef ASIO_HANDLER_TYPE(handler_type, \
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void(asio::error_code, range_type)) \
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asio_true_handler_type; \
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\
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ASIO_HANDLER_TYPE_REQUIREMENTS_ASSERT( \
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sizeof(asio::detail::two_arg_handler_test( \
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asio::detail::rvref< \
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asio_true_handler_type>(), \
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static_cast<const asio::error_code*>(0), \
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static_cast<const range_type*>(0))) == 1, \
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"ResolveHandler type requirements not met") \
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\
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typedef asio::detail::handler_type_requirements< \
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sizeof( \
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asio::detail::argbyv( \
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asio::detail::rvref< \
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asio_true_handler_type>())) + \
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sizeof( \
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asio::detail::lvref< \
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asio_true_handler_type>()( \
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asio::detail::lvref<const asio::error_code>(), \
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asio::detail::lvref<const range_type>()), \
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char(0))> ASIO_UNUSED_TYPEDEF
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#define ASIO_WAIT_HANDLER_CHECK( \
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handler_type, handler) \
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\
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typedef ASIO_HANDLER_TYPE(handler_type, \
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void(asio::error_code)) \
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asio_true_handler_type; \
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\
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ASIO_HANDLER_TYPE_REQUIREMENTS_ASSERT( \
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sizeof(asio::detail::one_arg_handler_test( \
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asio::detail::rvref< \
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asio_true_handler_type>(), \
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static_cast<const asio::error_code*>(0))) == 1, \
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"WaitHandler type requirements not met") \
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\
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typedef asio::detail::handler_type_requirements< \
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sizeof( \
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asio::detail::argbyv( \
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asio::detail::rvref< \
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asio_true_handler_type>())) + \
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sizeof( \
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asio::detail::lvref< \
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asio_true_handler_type>()( \
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asio::detail::lvref<const asio::error_code>()), \
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char(0))> ASIO_UNUSED_TYPEDEF
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#define ASIO_SIGNAL_HANDLER_CHECK( \
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handler_type, handler) \
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\
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typedef ASIO_HANDLER_TYPE(handler_type, \
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void(asio::error_code, int)) \
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asio_true_handler_type; \
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\
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ASIO_HANDLER_TYPE_REQUIREMENTS_ASSERT( \
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sizeof(asio::detail::two_arg_handler_test( \
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asio::detail::rvref< \
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asio_true_handler_type>(), \
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static_cast<const asio::error_code*>(0), \
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static_cast<const int*>(0))) == 1, \
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"SignalHandler type requirements not met") \
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\
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typedef asio::detail::handler_type_requirements< \
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sizeof( \
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asio::detail::argbyv( \
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asio::detail::rvref< \
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asio_true_handler_type>())) + \
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sizeof( \
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asio::detail::lvref< \
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asio_true_handler_type>()( \
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asio::detail::lvref<const asio::error_code>(), \
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asio::detail::lvref<const int>()), \
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char(0))> ASIO_UNUSED_TYPEDEF
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#define ASIO_HANDSHAKE_HANDLER_CHECK( \
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handler_type, handler) \
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\
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typedef ASIO_HANDLER_TYPE(handler_type, \
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void(asio::error_code)) \
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asio_true_handler_type; \
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\
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ASIO_HANDLER_TYPE_REQUIREMENTS_ASSERT( \
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sizeof(asio::detail::one_arg_handler_test( \
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asio::detail::rvref< \
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asio_true_handler_type>(), \
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static_cast<const asio::error_code*>(0))) == 1, \
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"HandshakeHandler type requirements not met") \
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\
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typedef asio::detail::handler_type_requirements< \
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sizeof( \
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asio::detail::argbyv( \
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asio::detail::rvref< \
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asio_true_handler_type>())) + \
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sizeof( \
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asio::detail::lvref< \
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asio_true_handler_type>()( \
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asio::detail::lvref<const asio::error_code>()), \
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char(0))> ASIO_UNUSED_TYPEDEF
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#define ASIO_BUFFERED_HANDSHAKE_HANDLER_CHECK( \
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handler_type, handler) \
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\
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typedef ASIO_HANDLER_TYPE(handler_type, \
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void(asio::error_code, std::size_t)) \
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asio_true_handler_type; \
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\
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ASIO_HANDLER_TYPE_REQUIREMENTS_ASSERT( \
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sizeof(asio::detail::two_arg_handler_test( \
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asio::detail::rvref< \
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asio_true_handler_type>(), \
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static_cast<const asio::error_code*>(0), \
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static_cast<const std::size_t*>(0))) == 1, \
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"BufferedHandshakeHandler type requirements not met") \
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|
\
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|
typedef asio::detail::handler_type_requirements< \
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|
sizeof( \
|
|
asio::detail::argbyv( \
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|
asio::detail::rvref< \
|
|
asio_true_handler_type>())) + \
|
|
sizeof( \
|
|
asio::detail::lvref< \
|
|
asio_true_handler_type>()( \
|
|
asio::detail::lvref<const asio::error_code>(), \
|
|
asio::detail::lvref<const std::size_t>()), \
|
|
char(0))> ASIO_UNUSED_TYPEDEF
|
|
|
|
#define ASIO_SHUTDOWN_HANDLER_CHECK( \
|
|
handler_type, handler) \
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|
\
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|
typedef ASIO_HANDLER_TYPE(handler_type, \
|
|
void(asio::error_code)) \
|
|
asio_true_handler_type; \
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|
\
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|
ASIO_HANDLER_TYPE_REQUIREMENTS_ASSERT( \
|
|
sizeof(asio::detail::one_arg_handler_test( \
|
|
asio::detail::rvref< \
|
|
asio_true_handler_type>(), \
|
|
static_cast<const asio::error_code*>(0))) == 1, \
|
|
"ShutdownHandler type requirements not met") \
|
|
\
|
|
typedef asio::detail::handler_type_requirements< \
|
|
sizeof( \
|
|
asio::detail::argbyv( \
|
|
asio::detail::rvref< \
|
|
asio_true_handler_type>())) + \
|
|
sizeof( \
|
|
asio::detail::lvref< \
|
|
asio_true_handler_type>()( \
|
|
asio::detail::lvref<const asio::error_code>()), \
|
|
char(0))> ASIO_UNUSED_TYPEDEF
|
|
|
|
#else // !defined(ASIO_ENABLE_HANDLER_TYPE_REQUIREMENTS)
|
|
|
|
#define ASIO_LEGACY_COMPLETION_HANDLER_CHECK( \
|
|
handler_type, handler) \
|
|
typedef int ASIO_UNUSED_TYPEDEF
|
|
|
|
#define ASIO_READ_HANDLER_CHECK( \
|
|
handler_type, handler) \
|
|
typedef int ASIO_UNUSED_TYPEDEF
|
|
|
|
#define ASIO_WRITE_HANDLER_CHECK( \
|
|
handler_type, handler) \
|
|
typedef int ASIO_UNUSED_TYPEDEF
|
|
|
|
#define ASIO_ACCEPT_HANDLER_CHECK( \
|
|
handler_type, handler) \
|
|
typedef int ASIO_UNUSED_TYPEDEF
|
|
|
|
#define ASIO_MOVE_ACCEPT_HANDLER_CHECK( \
|
|
handler_type, handler, socket_type) \
|
|
typedef int ASIO_UNUSED_TYPEDEF
|
|
|
|
#define ASIO_CONNECT_HANDLER_CHECK( \
|
|
handler_type, handler) \
|
|
typedef int ASIO_UNUSED_TYPEDEF
|
|
|
|
#define ASIO_RANGE_CONNECT_HANDLER_CHECK( \
|
|
handler_type, handler, iter_type) \
|
|
typedef int ASIO_UNUSED_TYPEDEF
|
|
|
|
#define ASIO_ITERATOR_CONNECT_HANDLER_CHECK( \
|
|
handler_type, handler, iter_type) \
|
|
typedef int ASIO_UNUSED_TYPEDEF
|
|
|
|
#define ASIO_RESOLVE_HANDLER_CHECK( \
|
|
handler_type, handler, iter_type) \
|
|
typedef int ASIO_UNUSED_TYPEDEF
|
|
|
|
#define ASIO_WAIT_HANDLER_CHECK( \
|
|
handler_type, handler) \
|
|
typedef int ASIO_UNUSED_TYPEDEF
|
|
|
|
#define ASIO_SIGNAL_HANDLER_CHECK( \
|
|
handler_type, handler) \
|
|
typedef int ASIO_UNUSED_TYPEDEF
|
|
|
|
#define ASIO_HANDSHAKE_HANDLER_CHECK( \
|
|
handler_type, handler) \
|
|
typedef int ASIO_UNUSED_TYPEDEF
|
|
|
|
#define ASIO_BUFFERED_HANDSHAKE_HANDLER_CHECK( \
|
|
handler_type, handler) \
|
|
typedef int ASIO_UNUSED_TYPEDEF
|
|
|
|
#define ASIO_SHUTDOWN_HANDLER_CHECK( \
|
|
handler_type, handler) \
|
|
typedef int ASIO_UNUSED_TYPEDEF
|
|
|
|
#endif // !defined(ASIO_ENABLE_HANDLER_TYPE_REQUIREMENTS)
|
|
|
|
} // namespace detail
|
|
} // namespace asio
|
|
|
|
#endif // ASIO_DETAIL_HANDLER_TYPE_REQUIREMENTS_HPP
|