e1543e694d
This re-implements the constraints on the std::pair constructors and assignment operators in C++20 mode, to use concepts. The non-standard constructors deprecated for PR 99957 are no longer supported in C++20 mode, which requires some minor testsuite changes. Otherwise all tests pass in C++20 mode. libstdc++-v3/ChangeLog: * include/bits/stl_pair.h (pair) [__cplusplus > 202002]: Add new definitions for constructors and assignment operators using concepts for constraints. * testsuite/20_util/pair/cons/99957.cc: Disable for C++20 and later. * testsuite/20_util/pair/cons/explicit_construct.cc: Adjust expected error messages to also match C++20 errors. |
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