https://gcc.gnu.org/bugzilla/show_bug.cgi?id=115420
--- Comment #7 from GCC Commits <cvs-commit at gcc dot gnu.org> --- The master branch has been updated by Jonathan Wakely <r...@gcc.gnu.org>: https://gcc.gnu.org/g:cc38bdf093c44918edff819ae6c73d03c726b341 commit r15-1256-gcc38bdf093c44918edff819ae6c73d03c726b341 Author: Jonathan Wakely <jwak...@redhat.com> Date: Tue Jun 11 11:08:12 2024 +0100 libstdc++: Improve diagnostics for invalid std::hash specializations [PR115420] When using a key type without a valid std::hash specialization the unordered containers give confusing diagnostics about the default constructor being deleted. Add a static_assert that will fail for disabled std::hash specializations (and for a subset of custom hash functions). libstdc++-v3/ChangeLog: PR libstdc++/115420 * include/bits/hashtable.h (_Hashtable): Add static_assert to check that hash function is copy constructible. * testsuite/23_containers/unordered_map/115420.cc: New test.
