[v5,4/4] libstdc++: Optimize is_compound trait performance
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Commit Message
This patch optimizes the performance of the is_compound trait by
dispatching to the new __is_arithmetic built-in trait.
libstdc++-v3/ChangeLog:
* include/std/type_traits (is_compound): Do not use __not_.
(is_compound_v): Use is_fundamental_v instead.
Signed-off-by: Ken Matsui <kmatsui@gcc.gnu.org>
---
libstdc++-v3/include/std/type_traits | 4 ++--
1 file changed, 2 insertions(+), 2 deletions(-)
@@ -704,7 +704,7 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
/// is_compound
template<typename _Tp>
struct is_compound
- : public __not_<is_fundamental<_Tp>>::type { };
+ : public __bool_constant<!is_fundamental<_Tp>::value> { };
/// @cond undocumented
template<typename _Tp>
@@ -3234,7 +3234,7 @@ template <typename _Tp>
template <typename _Tp>
inline constexpr bool is_scalar_v = is_scalar<_Tp>::value;
template <typename _Tp>
- inline constexpr bool is_compound_v = is_compound<_Tp>::value;
+ inline constexpr bool is_compound_v = !is_fundamental_v<_Tp>;
template <typename _Tp>
inline constexpr bool is_member_pointer_v = is_member_pointer<_Tp>::value;
template <typename _Tp>