https://gcc.gnu.org/bugzilla/show_bug.cgi?id=90220
--- Comment #6 from Jonathan Wakely <redi at gcc dot gnu.org> --- Author: redi Date: Thu May 23 13:39:06 2019 New Revision: 271556 URL: https://gcc.gnu.org/viewcvs?rev=271556&root=gcc&view=rev Log: PR libstdc++/90220 fix experimental::any_cast for non-object types This corresponds to the fixes done for std::any_cast, but has to be done without if-constexpr. The dummy specialization of _Manager_internal<_Op> is used to avoid instantiating the real _Manager_internal<T>::_S_manage function just to compare its address. PR libstdc++/90220 * include/experimental/any (__any_caster): Constrain to only be callable for object types. Use remove_cv_t instead of decay_t. If the type decays or isn't copy constructible, compare the manager function to a dummy specialization. (__any_caster): Add overload constrained for non-object types. (any::_Manager_internal<_Op>): Add dummy specialization. * testsuite/experimental/any/misc/any_cast.cc: Test function types and array types. Modified: trunk/libstdc++-v3/ChangeLog trunk/libstdc++-v3/include/experimental/any trunk/libstdc++-v3/testsuite/experimental/any/misc/any_cast.cc
