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fix usage of result_of in async()

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This commit is contained in:
Oliver Kowalke
2015-12-15 18:52:31 +01:00
parent 7753843287
commit 073e59cf22
1 changed files with 20 additions and 9 deletions
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29
include/boost/fiber/future/async.hpp
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@@ -19,26 +19,37 @@
namespace boost {
namespace fibers {
namespace detail {
// based on libstdc++-v3
template< typename Fn, typename ... Args >
using result_of =
typename std::result_of<
typename std::decay< Fn >::type( typename std::decay< Args >::type ... )
>::type;
}
template< typename Fn, typename ... Args >
future< typename std::result_of< Fn( Args && ... ) >::type >
future< detail::result_of< Fn, Args ... > >
async( Fn && fn, Args && ... args) {
typedef typename std::result_of< Fn( Args && ... ) >::type result_type;
using result_t = detail::result_of< Fn, Args ... >;
packaged_task< result_type( Args && ... ) > pt{ std::forward< Fn >( fn) };
future< result_type > f{ pt.get_future() };
packaged_task< result_t( Args ... ) > pt{ std::forward< Fn >( fn) };
future< result_t > f{ pt.get_future() };
fiber{ std::move( pt), std::forward< Args >( args) ... }.detach();
return f;
}
template< typename StackAllocator, typename Fn, typename ... Args >
future< typename std::result_of< Fn( Args && ... ) >::type >
future< detail::result_of< Fn, Args ... > >
async( std::allocator_arg_t, StackAllocator salloc, Fn && fn, Args && ... args) {
typedef typename std::result_of< Fn( Args && ... ) >::type result_type;
using result_t = detail::result_of< Fn, Args ... >;
packaged_task< result_type( Args && ... ) > pt{ std::forward< Fn >( fn) };
future< result_type > f{ pt.get_future() };
fiber{ salloc, std::move( pt), std::forward< Args >( args) ... }.detach();
packaged_task< result_t( Args ... ) > pt{
std::allocator_arg, salloc, std::forward< Fn >( fn) };
future< result_t > f{ pt.get_future() };
fiber{ std::move( pt), std::forward< Args >( args) ... }.detach();
return f;
}