113 lines
3.3 KiB
C++
113 lines
3.3 KiB
C++
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//
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// detached.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_DETACHED_HPP
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#define ASIO_DETACHED_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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#include <memory>
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#include "asio/detail/type_traits.hpp"
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#include "asio/detail/push_options.hpp"
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namespace asio {
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/// Class used to specify that an asynchronous operation is detached.
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/**
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* The detached_t class is used to indicate that an asynchronous operation is
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* detached. That is, there is no completion handler waiting for the
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* operation's result. A detached_t object may be passed as a handler to an
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* asynchronous operation, typically using the special value
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* @c asio::detached. For example:
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* @code my_socket.async_send(my_buffer, asio::detached);
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* @endcode
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*/
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class detached_t
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{
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public:
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/// Constructor.
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ASIO_CONSTEXPR detached_t()
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{
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}
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/// Adapts an executor to add the @c detached_t completion token as the
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/// default.
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template <typename InnerExecutor>
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struct executor_with_default : InnerExecutor
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{
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/// Specify @c detached_t as the default completion token type.
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typedef detached_t default_completion_token_type;
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/// Construct the adapted executor from the inner executor type.
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executor_with_default(const InnerExecutor& ex) ASIO_NOEXCEPT
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: InnerExecutor(ex)
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{
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}
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/// Convert the specified executor to the inner executor type, then use
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/// that to construct the adapted executor.
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template <typename OtherExecutor>
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executor_with_default(const OtherExecutor& ex,
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typename constraint<
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is_convertible<OtherExecutor, InnerExecutor>::value
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>::type = 0) ASIO_NOEXCEPT
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: InnerExecutor(ex)
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{
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}
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};
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/// Type alias to adapt an I/O object to use @c detached_t as its
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/// default completion token type.
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#if defined(ASIO_HAS_ALIAS_TEMPLATES) \
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|| defined(GENERATING_DOCUMENTATION)
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template <typename T>
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using as_default_on_t = typename T::template rebind_executor<
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executor_with_default<typename T::executor_type> >::other;
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#endif // defined(ASIO_HAS_ALIAS_TEMPLATES)
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// || defined(GENERATING_DOCUMENTATION)
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/// Function helper to adapt an I/O object to use @c detached_t as its
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/// default completion token type.
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template <typename T>
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static typename decay<T>::type::template rebind_executor<
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executor_with_default<typename decay<T>::type::executor_type>
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>::other
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as_default_on(ASIO_MOVE_ARG(T) object)
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{
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return typename decay<T>::type::template rebind_executor<
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executor_with_default<typename decay<T>::type::executor_type>
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>::other(ASIO_MOVE_CAST(T)(object));
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}
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};
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/// A special value, similar to std::nothrow.
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/**
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* See the documentation for asio::detached_t for a usage example.
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*/
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#if defined(ASIO_HAS_CONSTEXPR) || defined(GENERATING_DOCUMENTATION)
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constexpr detached_t detached;
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#elif defined(ASIO_MSVC)
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__declspec(selectany) detached_t detached;
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#endif
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} // namespace asio
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#include "asio/detail/pop_options.hpp"
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#include "asio/impl/detached.hpp"
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#endif // ASIO_DETACHED_HPP
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