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When I added the new mixin to _Hashtable, I forgot to explicitly construct it in each non-default constructor. That means you can't use any constructors unless all three of the hash function, equality function, and allocator are all default constructible. libstdc++-v3/ChangeLog: PR libstdc++/101583 * include/bits/hashtable.h (_Hashtable): Replace mixin with _Enable_default_ctor. Construct it explicitly in all non-forwarding, non-defaulted constructors. * testsuite/23_containers/unordered_map/cons/default.cc: Check non-default constructors can be used. * testsuite/23_containers/unordered_set/cons/default.cc: Likewise. |
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