This is an unofficial snapshot of the ISO/IEC JTC1 SC22 WG21 Core Issues List revision 117b. See http://www.open-std.org/jtc1/sc22/wg21/ for the official list.
2025-08-11
1980. Equivalent but not functionally-equivalent redeclarationsSection: 13.7.8 [temp.alias] Status: drafting Submitter: Richard Smith Date: 2014-08-04In an example like
template<typename T, typename U> using X = T; template<typename T> X<void, typename T::type> f(); template<typename T> X<void, typename T::other> f();
it appears that the second declaration of f is a redeclaration of the first but distinguishable by SFINAE, i.e., equivalent but not functionally equivalent.
Notes from the November, 2014 meeting:
CWG felt that these two declarations should not be equivalent.
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