On Mon, Oct 23, 2023 at 10:39 AM Patrick Palka <ppa...@redhat.com> wrote: > > On Mon, 23 Oct 2023, Ken Matsui wrote: > > > On Mon, Oct 23, 2023 at 10:05 AM Patrick Palka <ppa...@redhat.com> wrote: > > On Fri, Oct 20, 2023 at 12:22 PM Ken Matsui <kmat...@gcc.gnu.org> > > wrote: > > > > > > This patch optimizes the compilation performance of > > std::is_invocable > > > by dispatching to the new __is_invocable built-in trait. > > > > > > libstdc++-v3/ChangeLog: > > > > > > * include/std/type_traits (is_invocable): Use __is_invocable > > > built-in trait. > > > > Nice! We should use the trait directly in is_invocable_v too. > > > > > > Thank you! But we want to take account of static_assert’s in is_invocable, > > so I think we cannot use the built-in directly? > > Good point, I guess that's a great reason to improvement the diagnostic > that check_trait_type emits: it'd speed up the class template version > because we could get rid of the static_asserts (without regressing > diagnostic quality), and it'd speed up the variable template version > because we could use the built-in directly there. > > Your patch LGTM as is though, that could be a follow-up if anything. >
Thank you! I will also work on this after other built-in traits end! > > > > > > > * testsuite/20_util/is_invocable/incomplete_args_neg.cc: > > Handle > > > the new error from __is_invocable. > > > * testsuite/20_util/is_invocable/incomplete_neg.cc: > > Likewise. > > > > > > Signed-off-by: Ken Matsui <kmat...@gcc.gnu.org> > > > --- > > > libstdc++-v3/include/std/type_traits | 6 > > ++++++ > > > .../testsuite/20_util/is_invocable/incomplete_args_neg.cc | 1 + > > > .../testsuite/20_util/is_invocable/incomplete_neg.cc | 1 + > > > 3 files changed, 8 insertions(+) > > > > > > diff --git a/libstdc++-v3/include/std/type_traits > > b/libstdc++-v3/include/std/type_traits > > > index 75a94cb8d7e..91851b78c7e 100644 > > > --- a/libstdc++-v3/include/std/type_traits > > > +++ b/libstdc++-v3/include/std/type_traits > > > @@ -3167,9 +3167,15 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION > > > using invoke_result_t = typename invoke_result<_Fn, > > _Args...>::type; > > > > > > /// std::is_invocable > > > +#if _GLIBCXX_USE_BUILTIN_TRAIT(__is_invocable) > > > + template<typename _Fn, typename... _ArgTypes> > > > + struct is_invocable > > > + : public __bool_constant<__is_invocable(_Fn, _ArgTypes...)> > > > +#else > > > template<typename _Fn, typename... _ArgTypes> > > > struct is_invocable > > > : __is_invocable_impl<__invoke_result<_Fn, _ArgTypes...>, > > void>::type > > > +#endif > > > { > > > > > static_assert(std::__is_complete_or_unbounded(__type_identity<_Fn>{}), > > > "_Fn must be a complete class or an unbounded array"); > > > diff --git > > a/libstdc++-v3/testsuite/20_util/is_invocable/incomplete_args_neg.cc > > b/libstdc++-v3/testsuite/20_util/is_invocable/incomplete_args_neg.cc > > > index 34d1d9431d1..3f9e5274f3c 100644 > > > --- > > a/libstdc++-v3/testsuite/20_util/is_invocable/incomplete_args_neg.cc > > > +++ > > b/libstdc++-v3/testsuite/20_util/is_invocable/incomplete_args_neg.cc > > > @@ -18,6 +18,7 @@ > > > // <http://www.gnu.org/licenses/>. > > > > > > // { dg-error "must be a complete class" "" { target *-*-* } 0 } > > > +// { dg-prune-output "invalid use of incomplete type" } > > > > > > #include <type_traits> > > > > > > diff --git > > a/libstdc++-v3/testsuite/20_util/is_invocable/incomplete_neg.cc > > b/libstdc++-v3/testsuite/20_util/is_invocable/incomplete_neg.cc > > > index e1e54d25ee5..92af48c48b6 100644 > > > --- a/libstdc++-v3/testsuite/20_util/is_invocable/incomplete_neg.cc > > > +++ b/libstdc++-v3/testsuite/20_util/is_invocable/incomplete_neg.cc > > > @@ -18,6 +18,7 @@ > > > // <http://www.gnu.org/licenses/>. > > > > > > // { dg-error "must be a complete class" "" { target *-*-* } 0 } > > > +// { dg-prune-output "invalid use of incomplete type" } > > > > > > #include <type_traits> > > > > > > -- > > > 2.42.0 > > > > > > > > >