https://gcc.gnu.org/bugzilla/show_bug.cgi?id=105841
--- Comment #16 from Patrick Palka <ppalka at gcc dot gnu.org> --- (In reply to Haojian Wu from comment #15) > Hi, I notice that the __is_deducible was hidden in the commit > https://github.com/gcc-mirror/gcc/commit/ > 30556bf81f4385c2a9c449948865dbcf35664764. > > Is there any reason behind the change? > > (Context: I'm implementing the is_deducible part for alias CTAD in clang, > and I'm considering to add a similar builtin in clang). IIRC we didn't want to commit to an API for the built-in, and we also didn't have any motivating use cases for the it within libstdc++.
