<flat_set>: flat_set::emplace and emplace_hint should be constrained. - #5999
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Stephan T. Lavavej (StephanTLavavej) merged 1 commit intoJan 8, 2026
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Stephan T. Lavavej (StephanTLavavej)
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Jan 8, 2026
Stephan T. Lavavej (StephanTLavavej)
merged commit Jan 8, 2026
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According to [flat.multiset.modifiers],
emplaceshould be constrained withis_constructible_v<value_type, _Args...>. Similarly foremplace_hint(suggested by https://eel.is/c++draft/associative.reqmts#general-48, I suppose).