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implement LWG-3527 #2194

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merged 4 commits into from Sep 11, 2021
Merged

implement LWG-3527 #2194

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56a9632
implement LWG3527
fsb4000 Sep 9, 2021
b545849
move test code to P0475R1_P0591R4_uses_allocator_construction
fsb4000 Sep 9, 2021
68818c7
p is actually used :)
fsb4000 Sep 9, 2021
0f8b0c1
Code review feedback.
StephanTLavavej Sep 9, 2021
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6 changes: 3 additions & 3 deletions stl/inc/xmemory
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Expand Up @@ -2140,10 +2140,10 @@ template <class _Ty, class _Alloc, class _Uty1, class _Uty2, enable_if_t<_Is_spe
_NODISCARD constexpr auto uses_allocator_construction_args(const _Alloc& _Al, pair<_Uty1, _Uty2>&& _Pair) noexcept {
// equivalent to
// return _STD uses_allocator_construction_args<_Ty>(_Al, piecewise_construct,
// _STD forward_as_tuple(_STD move(_Pair).first), _STD forward_as_tuple(_STD move(_Pair).second));
// _STD forward_as_tuple(get<0>(_STD move(_Pair)), _STD forward_as_tuple(get<1>(_STD move(_Pair)));
return _STD make_tuple(piecewise_construct,
_STD uses_allocator_construction_args<typename _Ty::first_type>(_Al, _STD move(_Pair).first),
_STD uses_allocator_construction_args<typename _Ty::second_type>(_Al, _STD move(_Pair).second));
_STD uses_allocator_construction_args<typename _Ty::first_type>(_Al, get<0>(_STD move(_Pair))),
_STD uses_allocator_construction_args<typename _Ty::second_type>(_Al, get<1>(_STD move(_Pair))));
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}

template <class _Ty, class _Alloc, class... _Types>
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11 changes: 11 additions & 0 deletions tests/std/tests/P0475R1_P0591R4_uses_allocator_construction/test.cpp
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Expand Up @@ -179,6 +179,17 @@ void test_GH_2021() { // COMPILE-ONLY
tags[0];
}

struct MoveOnlyType {
MoveOnlyType() = default;
MoveOnlyType(MoveOnlyType&&) = default;
};

void test_LWG3527() { // COMPILE-ONLY
std::allocator<MoveOnlyType> alloc;
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auto p = pair<MoveOnlyType&&, MoveOnlyType&&>{MoveOnlyType{}, MoveOnlyType{}};
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[[maybe_unused]] auto t = uses_allocator_construction_args<pair<MoveOnlyType&&, MoveOnlyType&&>>(alloc, move(p));
}

int main() {
test_P0475R1();

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