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LWG-3466: specify the requirements for promise/future/shared_future consistently #1572

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Merged
Stephan T. Lavavej (StephanTLavavej) merged 1 commit into from
Jan 22, 2021
Merged

LWG-3466: specify the requirements for promise/future/shared_future consistently #1572

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9 changes: 9 additions & 0 deletions stl/inc/future
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Original file line number Diff line number Diff line change
Expand Up @@ -874,6 +874,9 @@ class future : public _State_manager<_Ty> {
using _Mybase = _State_manager<_Ty>;

public:
static_assert(!is_array_v<_Ty> && is_object_v<_Ty> && is_destructible_v<_Ty>,
"T in future<T> must meet the Cpp17Destructible requirements (N4878 [futures.unique.future]/4).");

future() noexcept {}

future(future&& _Other) noexcept : _Mybase(_STD move(_Other), true) {}
Expand Down Expand Up @@ -972,6 +975,9 @@ class shared_future : public _State_manager<_Ty> {
using _Mybase = _State_manager<_Ty>;

public:
static_assert(!is_array_v<_Ty> && is_object_v<_Ty> && is_destructible_v<_Ty>,
"T in shared_future<T> must meet the Cpp17Destructible requirements (N4878 [futures.shared.future]/4).");

shared_future() noexcept {}

shared_future(const shared_future& _Other) noexcept : _Mybase(_Other) {}
Expand Down Expand Up @@ -1139,6 +1145,9 @@ private:
template <class _Ty>
class promise { // class that defines an asynchronous provider that holds a value
public:
static_assert(!is_array_v<_Ty> && is_object_v<_Ty> && is_destructible_v<_Ty>,
"T in promise<T> must meet the Cpp17Destructible requirements (N4878 [futures.promise]/1).");

promise() : _MyPromise(new _Associated_state<_Ty>) {}

template <class _Alloc>
Expand Down