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Inspired by https://github.com/llvm/llvm-project/issues/101614 this inverts the relationship between forward_like and __like_t so that forward_like is defined in terms of __like_t and with a concrete return type. __like_t in turn is defined via partial specializations that pattern match on the const- and reference-ness of T. This turns out to be more SFINAE friendly and significantly cheaper to compile than the previous implementation. libstdc++-v3/ChangeLog: * include/bits/move.h (__like_impl): New metafunction. (__like_t): Redefine in terms of __like_impl. (forward_like): Redefine in terms of __like_t. * testsuite/20_util/forward_like/2_neg.cc: Don't expect error outside the immediate context anymore. Reviewed-by: Jonathan Wakely <jwakely@redhat.com>
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.