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// impl/redirect_error.hpp
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// ~~~~~~~~~~~~~~~~~~~~~~~
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//
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// Copyright (c) 2003-2020 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 BOOST_ASIO_IMPL_REDIRECT_ERROR_HPP
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#define BOOST_ASIO_IMPL_REDIRECT_ERROR_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 <boost/asio/detail/config.hpp>
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#include <boost/asio/associated_executor.hpp>
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#include <boost/asio/associated_allocator.hpp>
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#include <boost/asio/async_result.hpp>
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#include <boost/asio/detail/handler_alloc_helpers.hpp>
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#include <boost/asio/detail/handler_cont_helpers.hpp>
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#include <boost/asio/detail/handler_invoke_helpers.hpp>
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#include <boost/asio/detail/type_traits.hpp>
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#include <boost/asio/detail/variadic_templates.hpp>
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#include <boost/system/system_error.hpp>
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#include <boost/asio/detail/push_options.hpp>
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namespace boost {
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namespace asio {
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namespace detail {
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// Class to adapt a redirect_error_t as a completion handler.
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template <typename Handler>
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class redirect_error_handler
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{
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public:
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typedef void result_type;
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template <typename CompletionToken>
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redirect_error_handler(redirect_error_t<CompletionToken> e)
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: ec_(e.ec_),
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handler_(BOOST_ASIO_MOVE_CAST(CompletionToken)(e.token_))
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{
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}
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template <typename RedirectedHandler>
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redirect_error_handler(boost::system::error_code& ec,
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BOOST_ASIO_MOVE_ARG(RedirectedHandler) h)
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: ec_(ec),
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handler_(BOOST_ASIO_MOVE_CAST(RedirectedHandler)(h))
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{
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}
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void operator()()
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{
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handler_();
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}
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#if defined(BOOST_ASIO_HAS_VARIADIC_TEMPLATES)
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template <typename Arg, typename... Args>
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typename enable_if<
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!is_same<typename decay<Arg>::type, boost::system::error_code>::value
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>::type
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operator()(BOOST_ASIO_MOVE_ARG(Arg) arg, BOOST_ASIO_MOVE_ARG(Args)... args)
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{
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handler_(BOOST_ASIO_MOVE_CAST(Arg)(arg),
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BOOST_ASIO_MOVE_CAST(Args)(args)...);
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}
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template <typename... Args>
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void operator()(const boost::system::error_code& ec,
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BOOST_ASIO_MOVE_ARG(Args)... args)
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{
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ec_ = ec;
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handler_(BOOST_ASIO_MOVE_CAST(Args)(args)...);
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}
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#else // defined(BOOST_ASIO_HAS_VARIADIC_TEMPLATES)
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template <typename Arg>
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typename enable_if<
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!is_same<typename decay<Arg>::type, boost::system::error_code>::value
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>::type
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operator()(BOOST_ASIO_MOVE_ARG(Arg) arg)
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{
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handler_(BOOST_ASIO_MOVE_CAST(Arg)(arg));
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}
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void operator()(const boost::system::error_code& ec)
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{
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ec_ = ec;
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handler_();
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}
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#define BOOST_ASIO_PRIVATE_REDIRECT_ERROR_DEF(n) \
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template <typename Arg, BOOST_ASIO_VARIADIC_TPARAMS(n)> \
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typename enable_if< \
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!is_same<typename decay<Arg>::type, boost::system::error_code>::value \
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>::type \
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operator()(BOOST_ASIO_MOVE_ARG(Arg) arg, BOOST_ASIO_VARIADIC_MOVE_PARAMS(n)) \
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{ \
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handler_(BOOST_ASIO_MOVE_CAST(Arg)(arg), \
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BOOST_ASIO_VARIADIC_MOVE_ARGS(n)); \
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} \
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\
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template <BOOST_ASIO_VARIADIC_TPARAMS(n)> \
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void operator()(const boost::system::error_code& ec, \
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BOOST_ASIO_VARIADIC_MOVE_PARAMS(n)) \
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{ \
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ec_ = ec; \
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handler_(BOOST_ASIO_VARIADIC_MOVE_ARGS(n)); \
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} \
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/**/
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BOOST_ASIO_VARIADIC_GENERATE(BOOST_ASIO_PRIVATE_REDIRECT_ERROR_DEF)
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#undef BOOST_ASIO_PRIVATE_REDIRECT_ERROR_DEF
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#endif // defined(BOOST_ASIO_HAS_VARIADIC_TEMPLATES)
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//private:
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boost::system::error_code& ec_;
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Handler handler_;
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};
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template <typename Handler>
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inline asio_handler_allocate_is_deprecated
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asio_handler_allocate(std::size_t size,
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redirect_error_handler<Handler>* this_handler)
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{
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#if defined(BOOST_ASIO_NO_DEPRECATED)
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boost_asio_handler_alloc_helpers::allocate(size, this_handler->handler_);
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return asio_handler_allocate_is_no_longer_used();
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#else // defined(BOOST_ASIO_NO_DEPRECATED)
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return boost_asio_handler_alloc_helpers::allocate(
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size, this_handler->handler_);
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#endif // defined(BOOST_ASIO_NO_DEPRECATED)
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}
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template <typename Handler>
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inline asio_handler_deallocate_is_deprecated
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asio_handler_deallocate(void* pointer, std::size_t size,
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redirect_error_handler<Handler>* this_handler)
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{
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boost_asio_handler_alloc_helpers::deallocate(
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pointer, size, this_handler->handler_);
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#if defined(BOOST_ASIO_NO_DEPRECATED)
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return asio_handler_deallocate_is_no_longer_used();
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#endif // defined(BOOST_ASIO_NO_DEPRECATED)
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}
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template <typename Handler>
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inline bool asio_handler_is_continuation(
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redirect_error_handler<Handler>* this_handler)
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{
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return boost_asio_handler_cont_helpers::is_continuation(
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this_handler->handler_);
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}
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template <typename Function, typename Handler>
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inline asio_handler_invoke_is_deprecated
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asio_handler_invoke(Function& function,
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redirect_error_handler<Handler>* this_handler)
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{
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boost_asio_handler_invoke_helpers::invoke(
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function, this_handler->handler_);
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#if defined(BOOST_ASIO_NO_DEPRECATED)
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return asio_handler_invoke_is_no_longer_used();
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#endif // defined(BOOST_ASIO_NO_DEPRECATED)
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}
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template <typename Function, typename Handler>
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inline asio_handler_invoke_is_deprecated
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asio_handler_invoke(const Function& function,
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redirect_error_handler<Handler>* this_handler)
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{
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boost_asio_handler_invoke_helpers::invoke(
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function, this_handler->handler_);
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#if defined(BOOST_ASIO_NO_DEPRECATED)
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return asio_handler_invoke_is_no_longer_used();
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#endif // defined(BOOST_ASIO_NO_DEPRECATED)
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}
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template <typename Signature>
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struct redirect_error_signature
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{
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typedef Signature type;
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};
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#if defined(BOOST_ASIO_HAS_VARIADIC_TEMPLATES)
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template <typename R, typename... Args>
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struct redirect_error_signature<R(boost::system::error_code, Args...)>
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{
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typedef R type(Args...);
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};
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template <typename R, typename... Args>
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struct redirect_error_signature<R(const boost::system::error_code&, Args...)>
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{
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typedef R type(Args...);
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};
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#else // defined(BOOST_ASIO_HAS_VARIADIC_TEMPLATES)
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template <typename R>
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struct redirect_error_signature<R(boost::system::error_code)>
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{
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typedef R type();
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};
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template <typename R>
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struct redirect_error_signature<R(const boost::system::error_code&)>
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{
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typedef R type();
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};
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#define BOOST_ASIO_PRIVATE_REDIRECT_ERROR_DEF(n) \
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template <typename R, BOOST_ASIO_VARIADIC_TPARAMS(n)> \
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struct redirect_error_signature< \
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R(boost::system::error_code, BOOST_ASIO_VARIADIC_TARGS(n))> \
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{ \
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typedef R type(BOOST_ASIO_VARIADIC_TARGS(n)); \
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}; \
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\
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template <typename R, BOOST_ASIO_VARIADIC_TPARAMS(n)> \
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struct redirect_error_signature< \
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R(const boost::system::error_code&, BOOST_ASIO_VARIADIC_TARGS(n))> \
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{ \
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typedef R type(BOOST_ASIO_VARIADIC_TARGS(n)); \
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}; \
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/**/
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BOOST_ASIO_VARIADIC_GENERATE(BOOST_ASIO_PRIVATE_REDIRECT_ERROR_DEF)
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#undef BOOST_ASIO_PRIVATE_REDIRECT_ERROR_DEF
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#endif // defined(BOOST_ASIO_HAS_VARIADIC_TEMPLATES)
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} // namespace detail
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#if !defined(GENERATING_DOCUMENTATION)
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template <typename CompletionToken, typename Signature>
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struct async_result<redirect_error_t<CompletionToken>, Signature>
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{
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typedef typename async_result<CompletionToken,
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typename detail::redirect_error_signature<Signature>::type>
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::return_type return_type;
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template <typename Initiation>
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struct init_wrapper
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{
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template <typename Init>
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init_wrapper(boost::system::error_code& ec, BOOST_ASIO_MOVE_ARG(Init) init)
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: ec_(ec),
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initiation_(BOOST_ASIO_MOVE_CAST(Init)(init))
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{
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}
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#if defined(BOOST_ASIO_HAS_VARIADIC_TEMPLATES)
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template <typename Handler, typename... Args>
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void operator()(
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BOOST_ASIO_MOVE_ARG(Handler) handler,
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BOOST_ASIO_MOVE_ARG(Args)... args)
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{
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BOOST_ASIO_MOVE_CAST(Initiation)(initiation_)(
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detail::redirect_error_handler<
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typename decay<Handler>::type>(
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ec_, BOOST_ASIO_MOVE_CAST(Handler)(handler)),
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BOOST_ASIO_MOVE_CAST(Args)(args)...);
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}
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#else // defined(BOOST_ASIO_HAS_VARIADIC_TEMPLATES)
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template <typename Handler>
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void operator()(
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BOOST_ASIO_MOVE_ARG(Handler) handler)
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{
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BOOST_ASIO_MOVE_CAST(Initiation)(initiation_)(
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detail::redirect_error_handler<
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typename decay<Handler>::type>(
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ec_, BOOST_ASIO_MOVE_CAST(Handler)(handler)));
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}
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#define BOOST_ASIO_PRIVATE_INIT_WRAPPER_DEF(n) \
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template <typename Handler, BOOST_ASIO_VARIADIC_TPARAMS(n)> \
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void operator()( \
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BOOST_ASIO_MOVE_ARG(Handler) handler, \
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BOOST_ASIO_VARIADIC_MOVE_PARAMS(n)) \
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{ \
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BOOST_ASIO_MOVE_CAST(Initiation)(initiation_)( \
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detail::redirect_error_handler< \
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typename decay<Handler>::type>( \
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ec_, BOOST_ASIO_MOVE_CAST(Handler)(handler)), \
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BOOST_ASIO_VARIADIC_MOVE_ARGS(n)); \
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} \
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/**/
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BOOST_ASIO_VARIADIC_GENERATE(BOOST_ASIO_PRIVATE_INIT_WRAPPER_DEF)
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#undef BOOST_ASIO_PRIVATE_INIT_WRAPPER_DEF
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#endif // defined(BOOST_ASIO_HAS_VARIADIC_TEMPLATES)
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boost::system::error_code& ec_;
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Initiation initiation_;
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};
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#if defined(BOOST_ASIO_HAS_VARIADIC_TEMPLATES)
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template <typename Initiation, typename RawCompletionToken, typename... Args>
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static return_type initiate(
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BOOST_ASIO_MOVE_ARG(Initiation) initiation,
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BOOST_ASIO_MOVE_ARG(RawCompletionToken) token,
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BOOST_ASIO_MOVE_ARG(Args)... args)
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{
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return async_initiate<CompletionToken,
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typename detail::redirect_error_signature<Signature>::type>(
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init_wrapper<typename decay<Initiation>::type>(
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token.ec_, BOOST_ASIO_MOVE_CAST(Initiation)(initiation)),
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token.token_, BOOST_ASIO_MOVE_CAST(Args)(args)...);
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}
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#else // defined(BOOST_ASIO_HAS_VARIADIC_TEMPLATES)
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template <typename Initiation, typename RawCompletionToken>
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static return_type initiate(
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BOOST_ASIO_MOVE_ARG(Initiation) initiation,
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BOOST_ASIO_MOVE_ARG(RawCompletionToken) token)
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{
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return async_initiate<CompletionToken,
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typename detail::redirect_error_signature<Signature>::type>(
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init_wrapper<typename decay<Initiation>::type>(
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token.ec_, BOOST_ASIO_MOVE_CAST(Initiation)(initiation)),
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token.token_);
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}
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#define BOOST_ASIO_PRIVATE_INITIATE_DEF(n) \
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template <typename Initiation, typename RawCompletionToken, \
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BOOST_ASIO_VARIADIC_TPARAMS(n)> \
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static return_type initiate( \
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BOOST_ASIO_MOVE_ARG(Initiation) initiation, \
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BOOST_ASIO_MOVE_ARG(RawCompletionToken) token, \
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BOOST_ASIO_VARIADIC_MOVE_PARAMS(n)) \
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{ \
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return async_initiate<CompletionToken, \
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typename detail::redirect_error_signature<Signature>::type>( \
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init_wrapper<typename decay<Initiation>::type>( \
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token.ec_, BOOST_ASIO_MOVE_CAST(Initiation)(initiation)), \
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token.token_, BOOST_ASIO_VARIADIC_MOVE_ARGS(n)); \
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} \
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/**/
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BOOST_ASIO_VARIADIC_GENERATE(BOOST_ASIO_PRIVATE_INITIATE_DEF)
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#undef BOOST_ASIO_PRIVATE_INITIATE_DEF
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#endif // defined(BOOST_ASIO_HAS_VARIADIC_TEMPLATES)
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};
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template <typename Handler, typename Executor>
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struct associated_executor<detail::redirect_error_handler<Handler>, Executor>
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: detail::associated_executor_forwarding_base<Handler, Executor>
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{
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typedef typename associated_executor<Handler, Executor>::type type;
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static type get(
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const detail::redirect_error_handler<Handler>& h,
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const Executor& ex = Executor()) BOOST_ASIO_NOEXCEPT
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{
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return associated_executor<Handler, Executor>::get(h.handler_, ex);
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}
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};
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template <typename Handler, typename Allocator>
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struct associated_allocator<detail::redirect_error_handler<Handler>, Allocator>
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{
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typedef typename associated_allocator<Handler, Allocator>::type type;
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static type get(
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const detail::redirect_error_handler<Handler>& h,
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const Allocator& a = Allocator()) BOOST_ASIO_NOEXCEPT
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{
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return associated_allocator<Handler, Allocator>::get(h.handler_, a);
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}
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};
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#endif // !defined(GENERATING_DOCUMENTATION)
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} // namespace asio
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} // namespace boost
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#include <boost/asio/detail/pop_options.hpp>
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#endif // BOOST_ASIO_IMPL_REDIRECT_ERROR_HPP
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