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// Copyright Oliver Kowalke 2013.
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// Distributed under the Boost Software License, Version 1.0.
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// (See accompanying file LICENSE_1_0.txt or copy at
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// http://www.boost.org/LICENSE_1_0.txt)
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#ifndef BOOST_FIBERS_ASYNC_HPP
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#define BOOST_FIBERS_ASYNC_HPP
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#include <algorithm>
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#include <memory>
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#include <type_traits>
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#include <utility>
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#include <boost/config.hpp>
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#include <boost/fiber/future/future.hpp>
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#include <boost/fiber/future/packaged_task.hpp>
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#include <boost/fiber/policy.hpp>
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namespace boost {
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namespace fibers {
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#if defined(BOOST_MSVC) && (_MSC_VER >= 1911 && _MSVC_LANG >= 201703)
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template <typename>
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struct result_of;
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template <typename F, typename... Args>
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struct result_of<F(Args...)> : std::invoke_result<F, Args...> {};
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#else
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using std::result_of;
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#endif
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template< typename Fn, typename ... Args >
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future<
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typename result_of<
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typename std::enable_if<
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! detail::is_launch_policy< typename std::decay< Fn >::type >::value,
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typename std::decay< Fn >::type
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>::type( typename std::decay< Args >::type ... )
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>::type
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>
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async( Fn && fn, Args ... args) {
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typedef typename result_of<
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typename std::decay< Fn >::type( typename std::decay< Args >::type ... )
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>::type result_type;
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packaged_task< result_type( typename std::decay< Args >::type ... ) > pt{
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std::forward< Fn >( fn) };
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future< result_type > f{ pt.get_future() };
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fiber{ std::move( pt), std::forward< Args >( args) ... }.detach();
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return f;
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}
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template< typename Policy, typename Fn, typename ... Args >
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future<
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typename result_of<
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typename std::enable_if<
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detail::is_launch_policy< Policy >::value,
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typename std::decay< Fn >::type
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>::type( typename std::decay< Args >::type ...)
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>::type
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>
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async( Policy policy, Fn && fn, Args ... args) {
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typedef typename result_of<
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typename std::decay< Fn >::type( typename std::decay< Args >::type ... )
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>::type result_type;
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packaged_task< result_type( typename std::decay< Args >::type ... ) > pt{
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std::forward< Fn >( fn) };
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future< result_type > f{ pt.get_future() };
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fiber{ policy, std::move( pt), std::forward< Args >( args) ... }.detach();
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return f;
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}
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template< typename Policy, typename StackAllocator, typename Fn, typename ... Args >
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future<
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typename result_of<
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typename std::enable_if<
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detail::is_launch_policy< Policy >::value,
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typename std::decay< Fn >::type
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>::type( typename std::decay< Args >::type ... )
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>::type
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>
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async( Policy policy, std::allocator_arg_t, StackAllocator salloc, Fn && fn, Args ... args) {
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typedef typename result_of<
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typename std::decay< Fn >::type( typename std::decay< Args >::type ... )
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>::type result_type;
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packaged_task< result_type( typename std::decay< Args >::type ... ) > pt{
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std::forward< Fn >( fn) };
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future< result_type > f{ pt.get_future() };
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fiber{ policy, std::allocator_arg, salloc,
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std::move( pt), std::forward< Args >( args) ... }.detach();
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return f;
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}
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template< typename Policy, typename StackAllocator, typename Allocator, typename Fn, typename ... Args >
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future<
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typename result_of<
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typename std::enable_if<
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detail::is_launch_policy< Policy >::value,
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typename std::decay< Fn >::type
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>::type( typename std::decay< Args >::type ... )
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>::type
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>
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async( Policy policy, std::allocator_arg_t, StackAllocator salloc, Allocator alloc, Fn && fn, Args ... args) {
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typedef typename result_of<
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typename std::decay< Fn >::type( typename std::decay< Args >::type ... )
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>::type result_type;
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packaged_task< result_type( typename std::decay< Args >::type ... ) > pt{
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std::allocator_arg, alloc, std::forward< Fn >( fn) };
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future< result_type > f{ pt.get_future() };
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fiber{ policy, std::allocator_arg, salloc,
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std::move( pt), std::forward< Args >( args) ... }.detach();
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return f;
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}
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}}
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#endif // BOOST_FIBERS_ASYNC_HPP
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