// <future> -*- C++ -*-
-// Copyright (C) 2009-2017 Free Software Foundation, Inc.
+// Copyright (C) 2009-2020 Free Software Foundation, Inc.
//
// This file is part of the GNU ISO C++ Library. This library is free
// software; you can redistribute it and/or modify it under the
// _GLIBCXX_RESOLVE_LIB_DEFECTS
// 2021. Further incorrect usages of result_of
template<typename _Fn, typename... _Args>
- using __async_result_of = typename result_of<
- typename decay<_Fn>::type(typename decay<_Args>::type...)>::type;
+ using __async_result_of = typename __invoke_result<
+ typename decay<_Fn>::type, typename decay<_Args>::type...>::type;
template<typename _Fn, typename... _Args>
future<__async_result_of<_Fn, _Args...>>
future<__async_result_of<_Fn, _Args...>>
async(_Fn&& __fn, _Args&&... __args);
-#if defined(_GLIBCXX_HAS_GTHREADS) && defined(_GLIBCXX_USE_C99_STDINT_TR1)
+#if defined(_GLIBCXX_HAS_GTHREADS)
/// Base class and enclosing scope.
struct __future_base
virtual void
_M_run(_Args&&... __args)
{
- auto __boundfn = [&] () -> typename result_of<_Fn&(_Args&&...)>::type {
- return std::__invoke(_M_impl._M_fn, std::forward<_Args>(__args)...);
+ auto __boundfn = [&] () -> _Res {
+ return std::__invoke_r<_Res>(_M_impl._M_fn,
+ std::forward<_Args>(__args)...);
};
this->_M_set_result(_S_task_setter(this->_M_result, __boundfn));
}
virtual void
_M_run_delayed(_Args&&... __args, weak_ptr<_State_base> __self)
{
- auto __boundfn = [&] () -> typename result_of<_Fn&(_Args&&...)>::type {
- return std::__invoke(_M_impl._M_fn, std::forward<_Args>(__args)...);
+ auto __boundfn = [&] () -> _Res {
+ return std::__invoke_r<_Res>(_M_impl._M_fn,
+ std::forward<_Args>(__args)...);
};
this->_M_set_delayed_result(_S_task_setter(this->_M_result, __boundfn),
std::move(__self));
} _M_impl;
};
- template<typename _Signature, typename _Fn, typename _Alloc>
+ template<typename _Signature, typename _Fn,
+ typename _Alloc = std::allocator<int>>
static shared_ptr<__future_base::_Task_state_base<_Signature>>
- __create_task_state(_Fn&& __fn, const _Alloc& __a)
+ __create_task_state(_Fn&& __fn, const _Alloc& __a = _Alloc())
{
typedef typename decay<_Fn>::type _Fn2;
typedef __future_base::_Task_state<_Fn2, _Alloc, _Signature> _State;
static_cast<_Alloc&>(_M_impl));
}
- template<typename _Task, typename _Fn, bool
- = is_same<_Task, typename decay<_Fn>::type>::value>
- struct __constrain_pkgdtask
- { typedef void __type; };
-
- template<typename _Task, typename _Fn>
- struct __constrain_pkgdtask<_Task, _Fn, true>
- { };
-
/// packaged_task
template<typename _Res, typename... _ArgTypes>
class packaged_task<_Res(_ArgTypes...)>
typedef __future_base::_Task_state_base<_Res(_ArgTypes...)> _State_type;
shared_ptr<_State_type> _M_state;
+ // _GLIBCXX_RESOLVE_LIB_DEFECTS
+ // 3039. Unnecessary decay in thread and packaged_task
+ template<typename _Fn, typename _Fn2 = __remove_cvref_t<_Fn>>
+ using __not_same
+ = typename enable_if<!is_same<packaged_task, _Fn2>::value>::type;
+
public:
// Construction and destruction
packaged_task() noexcept { }
- // _GLIBCXX_RESOLVE_LIB_DEFECTS
- // 2095. missing constructors needed for uses-allocator construction
- template<typename _Allocator>
- packaged_task(allocator_arg_t, const _Allocator& __a) noexcept
- { }
-
- template<typename _Fn, typename = typename
- __constrain_pkgdtask<packaged_task, _Fn>::__type>
+ template<typename _Fn, typename = __not_same<_Fn>>
explicit
packaged_task(_Fn&& __fn)
- : packaged_task(allocator_arg, std::allocator<int>(),
- std::forward<_Fn>(__fn))
+ : _M_state(
+ __create_task_state<_Res(_ArgTypes...)>(std::forward<_Fn>(__fn)))
{ }
+#if __cplusplus < 201703L
// _GLIBCXX_RESOLVE_LIB_DEFECTS
- // 2097. packaged_task constructors should be constrained
+ // 2097. packaged_task constructors should be constrained
// 2407. [this constructor should not be] explicit
- template<typename _Fn, typename _Alloc, typename = typename
- __constrain_pkgdtask<packaged_task, _Fn>::__type>
+ // 2921. packaged_task and type-erased allocators
+ template<typename _Fn, typename _Alloc, typename = __not_same<_Fn>>
packaged_task(allocator_arg_t, const _Alloc& __a, _Fn&& __fn)
: _M_state(__create_task_state<_Res(_ArgTypes...)>(
- std::forward<_Fn>(__fn), __a))
+ std::forward<_Fn>(__fn), __a))
{ }
+ // _GLIBCXX_RESOLVE_LIB_DEFECTS
+ // 2095. missing constructors needed for uses-allocator construction
+ template<typename _Allocator>
+ packaged_task(allocator_arg_t, const _Allocator& __a) noexcept
+ { }
+
+ template<typename _Allocator>
+ packaged_task(allocator_arg_t, const _Allocator&,
+ const packaged_task&) = delete;
+
+ template<typename _Allocator>
+ packaged_task(allocator_arg_t, const _Allocator&,
+ packaged_task&& __other) noexcept
+ { this->swap(__other); }
+#endif
+
~packaged_task()
{
if (static_cast<bool>(_M_state) && !_M_state.unique())
packaged_task(const packaged_task&) = delete;
packaged_task& operator=(const packaged_task&) = delete;
- template<typename _Allocator>
- packaged_task(allocator_arg_t, const _Allocator&,
- const packaged_task&) = delete;
-
// Move support
packaged_task(packaged_task&& __other) noexcept
{ this->swap(__other); }
- template<typename _Allocator>
- packaged_task(allocator_arg_t, const _Allocator&,
- packaged_task&& __other) noexcept
- { this->swap(__other); }
-
packaged_task& operator=(packaged_task&& __other) noexcept
{
packaged_task(std::move(__other)).swap(*this);
packaged_task<_Res(_ArgTypes...)>& __y) noexcept
{ __x.swap(__y); }
+#if __cplusplus < 201703L
+ // _GLIBCXX_RESOLVE_LIB_DEFECTS
+ // 2976. Dangling uses_allocator specialization for packaged_task
template<typename _Res, typename _Alloc>
struct uses_allocator<packaged_task<_Res>, _Alloc>
: public true_type { };
-
+#endif
// Shared state created by std::async().
// Holds a deferred function and storage for its result.
//
// [futures.async]:
//
- // — a call to a waiting function on an asynchronous return object that
+ // - a call to a waiting function on an asynchronous return object that
// shares the shared state created by this async call shall block until
// the associated thread has completed, as if joined, or else time out.
//
- // — the associated thread completion synchronizes with the return from
+ // - the associated thread completion synchronizes with the return from
// the first function that successfully detects the ready status of the
// shared state or with the return from the last function that releases
// the shared state, whichever happens first.
/// async
template<typename _Fn, typename... _Args>
- future<__async_result_of<_Fn, _Args...>>
+ _GLIBCXX_NODISCARD future<__async_result_of<_Fn, _Args...>>
async(launch __policy, _Fn&& __fn, _Args&&... __args)
{
std::shared_ptr<__future_base::_State_base> __state;
/// async, potential overload
template<typename _Fn, typename... _Args>
- inline future<__async_result_of<_Fn, _Args...>>
+ _GLIBCXX_NODISCARD inline future<__async_result_of<_Fn, _Args...>>
async(_Fn&& __fn, _Args&&... __args)
{
return std::async(launch::async|launch::deferred,
}
#endif // _GLIBCXX_ASYNC_ABI_COMPAT
-#endif // _GLIBCXX_HAS_GTHREADS && _GLIBCXX_USE_C99_STDINT_TR1
+#endif // _GLIBCXX_HAS_GTHREADS
// @} group futures
_GLIBCXX_END_NAMESPACE_VERSION
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