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Currently the _ReuseOrAllocNode::operator(Args&&...) function always destroys the value stored in recycled nodes and constructs a new value. The _ReuseOrAllocNode type is only ever used for implementing assignment, either from another unordered container of the same type, or from std::initializer_list<value_type>. Consequently, the parameter pack Args only ever consists of a single parameter or type const value_type& or value_type. We can replace the variadic parameter pack with a single forwarding reference parameter, and when the value_type is assignable from that type we can use assignment instead of destroying the existing value and then constructing a new one. Using assignment is typically only possible for sets, because for maps the value_type is std::pair<const key_type, mapped_type> and in most cases std::is_assignable_v<const key_type&, const key_type&> is false. libstdc++-v3/ChangeLog: * include/bits/hashtable_policy.h (_ReuseOrAllocNode::operator()): Replace parameter pack with a single parameter. Assign to existing value when possible. * testsuite/23_containers/unordered_multiset/allocator/move_assign.cc: Adjust expected count of operations. * testsuite/23_containers/unordered_set/allocator/move_assign.cc: Likewise. Reviewed-by: François Dumont <fdumont@gcc.gnu.org> |
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| ChangeLog | ||
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| config.h.in | ||
| configure | ||
| configure.ac | ||
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file: libstdc++-v3/README New users may wish to point their web browsers to the file index.html in the 'doc/html' subdirectory. It contains brief building instructions and notes on how to configure the library in interesting ways.