Use requires
-clauses for pair
and tuple
since C++20
#4819
Merged
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Towards #602. Also unconditionally uses
is_swappable<T>::value
workaround forexpected
as suggested in #4658 (comment).Notes:
conjunction_v
are preserved fortuple
because fold expressions are not yet decomposed for associated constraints until C++26 (and thus doesn't short-circuit, see WG21-P2963R2);tuple
constructors were attempted but are currently given up due to LLVM-59827.