63e88f80
 Hu Chunming
提交三方库
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// Copyright Oliver Kowalke 2013.
// Distributed under the Boost Software License, Version 1.0.
// (See accompanying file LICENSE_1_0.txt or copy at
// http://www.boost.org/LICENSE_1_0.txt)
#ifndef BOOST_FIBERS_ASYNC_HPP
#define BOOST_FIBERS_ASYNC_HPP
#include <algorithm>
#include <memory>
#include <type_traits>
#include <utility>
#include <boost/config.hpp>
#include <boost/fiber/future/future.hpp>
#include <boost/fiber/future/packaged_task.hpp>
#include <boost/fiber/policy.hpp>
namespace boost {
namespace fibers {
#if (defined(BOOST_MSVC) && (_MSC_VER >= 1911 && _MSVC_LANG >= 201703)) || __cplusplus >= 202002L
template <typename>
struct result_of;
template <typename F, typename... Args>
struct result_of<F(Args...)> : std::invoke_result<F, Args...> {};
#else
using std::result_of;
#endif
template< typename Fn, typename ... Args >
future<
typename result_of<
typename std::enable_if<
! detail::is_launch_policy< typename std::decay< Fn >::type >::value,
typename std::decay< Fn >::type
>::type( typename std::decay< Args >::type ... )
>::type
>
async( Fn && fn, Args ... args) {
typedef typename result_of<
typename std::decay< Fn >::type( typename std::decay< Args >::type ... )
>::type result_type;
packaged_task< result_type( typename std::decay< Args >::type ... ) > pt{
std::forward< Fn >( fn) };
future< result_type > f{ pt.get_future() };
fiber{ std::move( pt), std::forward< Args >( args) ... }.detach();
return f;
}
template< typename Policy, typename Fn, typename ... Args >
future<
typename result_of<
typename std::enable_if<
detail::is_launch_policy< Policy >::value,
typename std::decay< Fn >::type
>::type( typename std::decay< Args >::type ...)
>::type
>
async( Policy policy, Fn && fn, Args ... args) {
typedef typename result_of<
typename std::decay< Fn >::type( typename std::decay< Args >::type ... )
>::type result_type;
packaged_task< result_type( typename std::decay< Args >::type ... ) > pt{
std::forward< Fn >( fn) };
future< result_type > f{ pt.get_future() };
fiber{ policy, std::move( pt), std::forward< Args >( args) ... }.detach();
return f;
}
template< typename Policy, typename StackAllocator, typename Fn, typename ... Args >
future<
typename result_of<
typename std::enable_if<
detail::is_launch_policy< Policy >::value,
typename std::decay< Fn >::type
>::type( typename std::decay< Args >::type ... )
>::type
>
async( Policy policy, std::allocator_arg_t, StackAllocator salloc, Fn && fn, Args ... args) {
typedef typename result_of<
typename std::decay< Fn >::type( typename std::decay< Args >::type ... )
>::type result_type;
packaged_task< result_type( typename std::decay< Args >::type ... ) > pt{
std::forward< Fn >( fn) };
future< result_type > f{ pt.get_future() };
fiber{ policy, std::allocator_arg, salloc,
std::move( pt), std::forward< Args >( args) ... }.detach();
return f;
}
template< typename Policy, typename StackAllocator, typename Allocator, typename Fn, typename ... Args >
future<
typename result_of<
typename std::enable_if<
detail::is_launch_policy< Policy >::value,
typename std::decay< Fn >::type
>::type( typename std::decay< Args >::type ... )
>::type
>
async( Policy policy, std::allocator_arg_t, StackAllocator salloc, Allocator alloc, Fn && fn, Args ... args) {
typedef typename result_of<
typename std::decay< Fn >::type( typename std::decay< Args >::type ... )
>::type result_type;
packaged_task< result_type( typename std::decay< Args >::type ... ) > pt{
std::allocator_arg, alloc, std::forward< Fn >( fn) };
future< result_type > f{ pt.get_future() };
fiber{ policy, std::allocator_arg, salloc,
std::move( pt), std::forward< Args >( args) ... }.detach();
return f;
}
}}
#endif // BOOST_FIBERS_ASYNC_HPP
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