301 lines
9.3 KiB
C++
301 lines
9.3 KiB
C++
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//
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// any_io_executor.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_ANY_IO_EXECUTOR_HPP
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#define ASIO_ANY_IO_EXECUTOR_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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#if defined(ASIO_USE_TS_EXECUTOR_AS_DEFAULT)
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# include "asio/executor.hpp"
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#else // defined(ASIO_USE_TS_EXECUTOR_AS_DEFAULT)
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# include "asio/execution.hpp"
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# include "asio/execution_context.hpp"
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#endif // defined(ASIO_USE_TS_EXECUTOR_AS_DEFAULT)
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#include "asio/detail/push_options.hpp"
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namespace asio {
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#if defined(ASIO_USE_TS_EXECUTOR_AS_DEFAULT)
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typedef executor any_io_executor;
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#else // defined(ASIO_USE_TS_EXECUTOR_AS_DEFAULT)
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/// Polymorphic executor type for use with I/O objects.
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/**
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* The @c any_io_executor type is a polymorphic executor that supports the set
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* of properties required by I/O objects. It is defined as the
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* execution::any_executor class template parameterised as follows:
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* @code execution::any_executor<
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* execution::context_as_t<execution_context&>,
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* execution::blocking_t::never_t,
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* execution::prefer_only<execution::blocking_t::possibly_t>,
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* execution::prefer_only<execution::outstanding_work_t::tracked_t>,
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* execution::prefer_only<execution::outstanding_work_t::untracked_t>,
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* execution::prefer_only<execution::relationship_t::fork_t>,
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* execution::prefer_only<execution::relationship_t::continuation_t>
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* > @endcode
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*/
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class any_io_executor :
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#if defined(GENERATING_DOCUMENTATION)
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public execution::any_executor<...>
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#else // defined(GENERATING_DOCUMENTATION)
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public execution::any_executor<
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execution::context_as_t<execution_context&>,
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execution::blocking_t::never_t,
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execution::prefer_only<execution::blocking_t::possibly_t>,
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execution::prefer_only<execution::outstanding_work_t::tracked_t>,
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execution::prefer_only<execution::outstanding_work_t::untracked_t>,
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execution::prefer_only<execution::relationship_t::fork_t>,
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execution::prefer_only<execution::relationship_t::continuation_t>
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>
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#endif // defined(GENERATING_DOCUMENTATION)
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{
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public:
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#if !defined(GENERATING_DOCUMENTATION)
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typedef execution::any_executor<
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execution::context_as_t<execution_context&>,
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execution::blocking_t::never_t,
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execution::prefer_only<execution::blocking_t::possibly_t>,
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execution::prefer_only<execution::outstanding_work_t::tracked_t>,
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execution::prefer_only<execution::outstanding_work_t::untracked_t>,
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execution::prefer_only<execution::relationship_t::fork_t>,
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execution::prefer_only<execution::relationship_t::continuation_t>
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> base_type;
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typedef void supportable_properties_type(
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execution::context_as_t<execution_context&>,
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execution::blocking_t::never_t,
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execution::prefer_only<execution::blocking_t::possibly_t>,
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execution::prefer_only<execution::outstanding_work_t::tracked_t>,
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execution::prefer_only<execution::outstanding_work_t::untracked_t>,
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execution::prefer_only<execution::relationship_t::fork_t>,
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execution::prefer_only<execution::relationship_t::continuation_t>
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);
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#endif // !defined(GENERATING_DOCUMENTATION)
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/// Default constructor.
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any_io_executor() ASIO_NOEXCEPT
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: base_type()
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{
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}
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/// Construct in an empty state. Equivalent effects to default constructor.
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any_io_executor(nullptr_t) ASIO_NOEXCEPT
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: base_type(nullptr_t())
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{
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}
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/// Copy constructor.
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any_io_executor(const any_io_executor& e) ASIO_NOEXCEPT
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: base_type(static_cast<const base_type&>(e))
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{
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}
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#if defined(ASIO_HAS_MOVE) || defined(GENERATING_DOCUMENTATION)
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/// Move constructor.
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any_io_executor(any_io_executor&& e) ASIO_NOEXCEPT
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: base_type(static_cast<base_type&&>(e))
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{
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}
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#endif // defined(ASIO_HAS_MOVE) || defined(GENERATING_DOCUMENTATION)
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/// Construct to point to the same target as another any_executor.
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#if defined(GENERATING_DOCUMENTATION)
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template <class... OtherSupportableProperties>
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any_io_executor(execution::any_executor<OtherSupportableProperties...> e);
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#else // defined(GENERATING_DOCUMENTATION)
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template <typename OtherAnyExecutor>
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any_io_executor(OtherAnyExecutor e,
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typename constraint<
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conditional<
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!is_same<OtherAnyExecutor, any_io_executor>::value
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&& is_base_of<execution::detail::any_executor_base,
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OtherAnyExecutor>::value,
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typename execution::detail::supportable_properties<
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0, supportable_properties_type>::template
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is_valid_target<OtherAnyExecutor>,
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false_type
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>::type::value
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>::type = 0)
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: base_type(ASIO_MOVE_CAST(OtherAnyExecutor)(e))
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{
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}
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#endif // defined(GENERATING_DOCUMENTATION)
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/// Construct a polymorphic wrapper for the specified executor.
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#if defined(GENERATING_DOCUMENTATION)
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template <ASIO_EXECUTION_EXECUTOR Executor>
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any_io_executor(Executor e);
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#else // defined(GENERATING_DOCUMENTATION)
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template <ASIO_EXECUTION_EXECUTOR Executor>
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any_io_executor(Executor e,
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typename constraint<
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conditional<
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!is_same<Executor, any_io_executor>::value
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&& !is_base_of<execution::detail::any_executor_base,
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Executor>::value,
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execution::detail::is_valid_target_executor<
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Executor, supportable_properties_type>,
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false_type
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>::type::value
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>::type = 0)
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: base_type(ASIO_MOVE_CAST(Executor)(e))
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{
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}
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#endif // defined(GENERATING_DOCUMENTATION)
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/// Assignment operator.
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any_io_executor& operator=(const any_io_executor& e) ASIO_NOEXCEPT
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{
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base_type::operator=(static_cast<const base_type&>(e));
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return *this;
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}
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#if defined(ASIO_HAS_MOVE) || defined(GENERATING_DOCUMENTATION)
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/// Move assignment operator.
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any_io_executor& operator=(any_io_executor&& e) ASIO_NOEXCEPT
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{
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base_type::operator=(static_cast<base_type&&>(e));
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return *this;
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}
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#endif // defined(ASIO_HAS_MOVE) || defined(GENERATING_DOCUMENTATION)
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/// Assignment operator that sets the polymorphic wrapper to the empty state.
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any_io_executor& operator=(nullptr_t)
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{
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base_type::operator=(nullptr_t());
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return *this;
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}
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/// Destructor.
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~any_io_executor()
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{
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}
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/// Swap targets with another polymorphic wrapper.
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void swap(any_io_executor& other) ASIO_NOEXCEPT
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{
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static_cast<base_type&>(*this).swap(static_cast<base_type&>(other));
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}
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/// Obtain a polymorphic wrapper with the specified property.
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/**
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* Do not call this function directly. It is intended for use with the
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* asio::require and asio::prefer customisation points.
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*
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* For example:
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* @code any_io_executor ex = ...;
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* auto ex2 = asio::require(ex, execution::blocking.possibly); @endcode
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*/
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template <typename Property>
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any_io_executor require(const Property& p,
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typename constraint<
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traits::require_member<const base_type&, const Property&>::is_valid
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>::type = 0) const
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{
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return static_cast<const base_type&>(*this).require(p);
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}
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/// Obtain a polymorphic wrapper with the specified property.
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/**
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* Do not call this function directly. It is intended for use with the
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* asio::prefer customisation point.
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*
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* For example:
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* @code any_io_executor ex = ...;
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* auto ex2 = asio::prefer(ex, execution::blocking.possibly); @endcode
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*/
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template <typename Property>
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any_io_executor prefer(const Property& p,
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typename constraint<
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traits::prefer_member<const base_type&, const Property&>::is_valid
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>::type = 0) const
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{
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return static_cast<const base_type&>(*this).prefer(p);
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}
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};
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#if !defined(GENERATING_DOCUMENTATION)
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namespace traits {
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#if !defined(ASIO_HAS_DEDUCED_EQUALITY_COMPARABLE_TRAIT)
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template <>
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struct equality_comparable<any_io_executor>
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{
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static const bool is_valid = true;
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static const bool is_noexcept = true;
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};
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#endif // !defined(ASIO_HAS_DEDUCED_EQUALITY_COMPARABLE_TRAIT)
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#if !defined(ASIO_HAS_DEDUCED_EXECUTE_MEMBER_TRAIT)
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template <typename F>
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struct execute_member<any_io_executor, F>
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{
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static const bool is_valid = true;
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static const bool is_noexcept = false;
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typedef void result_type;
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};
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#endif // !defined(ASIO_HAS_DEDUCED_EXECUTE_MEMBER_TRAIT)
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#if !defined(ASIO_HAS_DEDUCED_QUERY_MEMBER_TRAIT)
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template <typename Prop>
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struct query_member<any_io_executor, Prop> :
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query_member<any_io_executor::base_type, Prop>
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{
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};
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#endif // !defined(ASIO_HAS_DEDUCED_QUERY_MEMBER_TRAIT)
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#if !defined(ASIO_HAS_DEDUCED_REQUIRE_MEMBER_TRAIT)
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template <typename Prop>
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struct require_member<any_io_executor, Prop> :
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require_member<any_io_executor::base_type, Prop>
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{
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typedef any_io_executor result_type;
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};
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#endif // !defined(ASIO_HAS_DEDUCED_REQUIRE_MEMBER_TRAIT)
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#if !defined(ASIO_HAS_DEDUCED_PREFER_MEMBER_TRAIT)
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template <typename Prop>
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struct prefer_member<any_io_executor, Prop> :
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prefer_member<any_io_executor::base_type, Prop>
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{
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typedef any_io_executor result_type;
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};
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#endif // !defined(ASIO_HAS_DEDUCED_PREFER_MEMBER_TRAIT)
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} // namespace traits
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#endif // !defined(GENERATING_DOCUMENTATION)
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#endif // defined(ASIO_USE_TS_EXECUTOR_AS_DEFAULT)
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} // namespace asio
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#include "asio/detail/pop_options.hpp"
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#endif // ASIO_ANY_IO_EXECUTOR_HPP
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