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exclude packaged_task ctor form overload resolution

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This commit is contained in:
Oliver Kowalke
2015-12-13 17:11:23 +01:00
parent 5753122693
commit bd88147589
1 changed files with 18 additions and 2 deletions
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20
include/boost/fiber/future/packaged_task.hpp
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@@ -9,6 +9,7 @@
#include <algorithm>
#include <memory>
#include <type_traits>
#include <utility>
#include <boost/config.hpp>
@@ -28,6 +29,7 @@ class packaged_task;
template< typename R, typename ... Args >
class packaged_task< R( Args ... ) > {
private:
typedef packaged_task< R( Args ... ) > self_t;
typedef typename detail::task_base< R, Args ... >::ptr_t ptr_t;
bool obtained_{ false };
@@ -36,14 +38,28 @@ private:
public:
constexpr packaged_task() noexcept = default;
template< typename Fn >
template< typename Fn,
class = typename std::enable_if<
! std::is_same<
typename std::decay< Fn >::type,
self_t
>::value
>::type
>
explicit packaged_task( Fn && fn) :
packaged_task{ std::allocator_arg,
std::allocator< packaged_task >{},
std::forward< Fn >( fn) } {
}
template< typename Fn, typename Allocator >
template< typename Fn, typename Allocator,
class = typename std::enable_if<
! std::is_same<
typename std::decay< Fn >::type,
self_t
>::value
>::type
>
explicit packaged_task( std::allocator_arg_t, Allocator const& alloc, Fn && fn) {
typedef detail::task_object<
typename std::decay< Fn >::type, Allocator, R, Args ...