https://gcc.gnu.org/bugzilla/show_bug.cgi?id=110593
--- Comment #1 from CVS Commits <cvs-commit at gcc dot gnu.org> --- The master branch has been updated by Jonathan Wakely <r...@gcc.gnu.org>: https://gcc.gnu.org/g:2d614822e9ea2a3d8800045d66e3220743753d09 commit r14-2660-g2d614822e9ea2a3d8800045d66e3220743753d09 Author: Jonathan Wakely <jwak...@redhat.com> Date: Wed Jul 19 18:18:46 2023 +0100 libstdc++: Check for std::ratio in arithmetic and comparisons [PR110593] The standard says that it should be ill-formed to use std::ratio_equal etc. with types which are not specializations of std::ratio. This implements that requirement. We don't need to add assertions to every one of the class templates, because many of them are implemented in terms of other ones. For example, ratio_divide and ratio_subtract can rely on the assertions in ratio_multiply and ratio_add respectively. libstdc++-v3/ChangeLog: PR libstdc++/110593 * include/bits/chrono.h (duration): Improve static assert messages. (__is_ratio): Move to ... * include/std/ratio (__is_ratio): ... here. (__is_ratio_v): New variable template and partial specialization. (__are_both_ratios): New function template. (__ratio_multiply, ratio_equal, ratio_less, __ratio_add): Add static assertion. * testsuite/20_util/ratio/requirements/type_constraints.cc: New test. * testsuite/20_util/duration/requirements/typedefs_neg1.cc: Adjust expected error. * testsuite/20_util/duration/requirements/typedefs_neg2.cc: Likewise.
