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libstdc++: Optimize std::is_nothrow_invocable compilation performance

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This patch optimizes the compilation performance of
std::is_nothrow_invocable by dispatching to the new
__is_nothrow_invocable built-in trait.

libstdc++-v3/ChangeLog:

	* include/std/type_traits (is_nothrow_invocable): Use
	__is_nothrow_invocable built-in trait.
	* testsuite/20_util/is_nothrow_invocable/incomplete_args_neg.cc:
	Handle the new error from __is_nothrow_invocable.
	* testsuite/20_util/is_nothrow_invocable/incomplete_neg.cc:
	Likewise.

Signed-off-by: Ken Matsui <kmatsui@gcc.gnu.org>
Reviewed-by: Patrick Palka <ppalka@redhat.com>
Reviewed-by: Jonathan Wakely <jwakely@redhat.com>
This commit is contained in:
Ken Matsui 2024-02-21 00:49:10 -08:00
parent dbb26feeb6
commit 3060e92302
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3 changed files with 6 additions and 0 deletions
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4
libstdc++-v3/include/std/type_traits
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@ -3231,8 +3231,12 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
/// std::is_nothrow_invocable
template<typename _Fn, typename... _ArgTypes>
struct is_nothrow_invocable
#if _GLIBCXX_USE_BUILTIN_TRAIT(__is_nothrow_invocable)
: public __bool_constant<__is_nothrow_invocable(_Fn, _ArgTypes...)>
#else
: __and_<__is_invocable_impl<__invoke_result<_Fn, _ArgTypes...>, void>,
__call_is_nothrow_<_Fn, _ArgTypes...>>::type
#endif
{
static_assert(std::__is_complete_or_unbounded(__type_identity<_Fn>{}),
"_Fn must be a complete class or an unbounded array");

1
libstdc++-v3/testsuite/20_util/is_nothrow_invocable/incomplete_args_neg.cc
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@ -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>

1
libstdc++-v3/testsuite/20_util/is_nothrow_invocable/incomplete_neg.cc
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@ -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>