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Clarify optional::swap conditions #5065

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merged 2 commits into from
Nov 8, 2024
Merged

Clarify optional::swap conditions #5065

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fe706e2
Clarify optional::swap conditions
KSARK Nov 4, 2024
258de90
Update working draft citations to N4993
CaseyCarter Nov 4, 2024
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10 changes: 6 additions & 4 deletions stl/inc/optional
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Original file line number Diff line number Diff line change
Expand Up @@ -349,10 +349,12 @@ public:

_CONSTEXPR20 void swap(optional& _Right)
noexcept(is_nothrow_move_constructible_v<_Ty> && is_nothrow_swappable_v<_Ty>) {
static_assert(is_move_constructible_v<_Ty>,
"optional<T>::swap requires T to be move constructible (N4950 [optional.swap]/1).");
static_assert(!is_move_constructible_v<_Ty> || is_swappable_v<_Ty>,
"optional<T>::swap requires T to be swappable (N4950 [optional.swap]/2).");
if constexpr (is_move_constructible_v<_Ty>) {
static_assert(
is_swappable_v<_Ty>, "optional<T>::swap requires T to be swappable (N4993 [optional.swap]/2).");
} else {
static_assert(false, "optional<T>::swap requires T to be move constructible (N4993 [optional.swap]/1).");
}
using _STD swap;
if constexpr (_Is_trivially_swappable_v<_Ty>) {
using _TrivialBaseTy = _Optional_destruct_base<_Ty>;
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