https://gcc.gnu.org/bugzilla/show_bug.cgi?id=100940
--- Comment #10 from CVS Commits <cvs-commit at gcc dot gnu.org> --- The master branch has been updated by Patrick Palka <ppa...@gcc.gnu.org>: https://gcc.gnu.org/g:2b87f3318cf6334a3a42dcf27f2fdec0fce04665 commit r12-1567-g2b87f3318cf6334a3a42dcf27f2fdec0fce04665 Author: Patrick Palka <ppa...@redhat.com> Date: Thu Jun 17 09:46:07 2021 -0400 libstdc++: Non-triv-copyable extra args aren't simple [PR100940] This force-enables perfect forwarding call wrapper semantics whenever the extra arguments of a partially applied range adaptor aren't all trivially copyable, so as to avoid incurring unnecessary copies of potentially expensive-to-copy objects (such as std::function objects) when invoking the adaptor. PR libstdc++/100940 libstdc++-v3/ChangeLog: * include/std/ranges (__adaptor::_Partial): For the "simple" forwarding partial specializations, also require that the extra arguments are trivially copyable. * testsuite/std/ranges/adaptors/100577.cc (test04): New test.
