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The following patch attempts to implement the library side of the C++23 P2674R1 paper. As mentioned in the paper, since CWG2605 the trait isn't really implementable purely on the library side. The compiler side has been committed earlier, so this just uses the new builtin trait on the library side. 2025-10-30 Jakub Jelinek <jakub@redhat.com> * include/bits/version.def (is_implicit_lifetime): New. * include/bits/version.h: Regenerate. * include/std/type_traits (std::is_implicit_lifetime, std::is_implicit_lifetime_v): New trait. * src/c++23/std.cc.in (std::is_implicit_lifetime, std::is_implicit_lifetime_v): Export. * testsuite/20_util/is_implicit_lifetime/version.cc: New test. * testsuite/20_util/is_implicit_lifetime/value.cc: New test.
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.