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Section: 220.127.116.11 [refwrap.const] Status: C++20 Submitter: Agustín K-ballo Bergé Opened: 2017-12-04 Last modified: 2021-02-25
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Another occurrence of unnecessary decay (P0777) was introduced by the resolution of LWG 2993. A decayed function/array type will never be the same type as reference_wrapper.
[ 2018-01-09 Moved to Tentatively Ready after 9 positive votes on c++std-lib. ]
[2018-3-17 Adopted in Jacksonville]
This wording is relative to N4713.
Change 18.104.22.168 [refwrap.const] as indicated:
template<class U> reference_wrapper(U&& u) noexcept(see below);
-1- Remarks: Let FUN denote the exposition-only functionsvoid FUN(T&) noexcept; void FUN(T&&) = delete;
This constructor shall not participate in overload resolution unless the expression FUN(declval<U>()) is well-formed and is_same_v<
decay_t<U>, reference_wrapper> is false. The expression inside noexcept is equivalent to noexcept(FUN(declval<U>())).