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The recent change to _Hashtable_ebo_helper for this PR broke the is_default_constructible trait for a hash container with a non-default constructible allocator. That happens because the constructor needs to be user-provided in order to initialize the member, and so is not defined as deleted when the type is not default constructible. By making _Hashtable derive from _Enable_special_members we can ensure that the default constructor for the std::unordered_xxx containers is deleted when it would be ill-formed. This makes the trait give the correct answer. Signed-off-by: Jonathan Wakely <jwakely@redhat.com> libstdc++-v3/ChangeLog: PR libstdc++/100863 * include/bits/hashtable.h (_Hashtable): Conditionally delete default constructor by deriving from _Enable_special_members. * testsuite/23_containers/unordered_map/cons/default.cc: New test. * testsuite/23_containers/unordered_set/cons/default.cc: New test. |
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