@@ -725,11 +725,18 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
{ };
/// is_object
+#if _GLIBCXX_USE_BUILTIN_TRAIT(__is_object)
+ template<typename _Tp>
+ struct is_object
+ : public __bool_constant<__is_object(_Tp)>
+ { };
+#else
template<typename _Tp>
struct is_object
: public __not_<__or_<is_function<_Tp>, is_reference<_Tp>,
is_void<_Tp>>>::type
{ };
+#endif
template<typename>
struct is_member_pointer;
@@ -3280,8 +3287,15 @@ template <typename _Tp>
inline constexpr bool is_arithmetic_v = is_arithmetic<_Tp>::value;
template <typename _Tp>
inline constexpr bool is_fundamental_v = is_fundamental<_Tp>::value;
+
+#if _GLIBCXX_USE_BUILTIN_TRAIT(__is_object)
+template <typename _Tp>
+ inline constexpr bool is_object_v = __is_object(_Tp);
+#else
template <typename _Tp>
inline constexpr bool is_object_v = is_object<_Tp>::value;
+#endif
+
template <typename _Tp>
inline constexpr bool is_scalar_v = is_scalar<_Tp>::value;
template <typename _Tp>
This patch optimizes the compilation performance of std::is_object by dispatching to the new __is_object built-in trait. libstdc++-v3/ChangeLog: * include/std/type_traits (is_object): Use __is_object built-in trait. (is_object_v): Likewise. Signed-off-by: Ken Matsui <kmatsui@gcc.gnu.org> --- libstdc++-v3/include/std/type_traits | 14 ++++++++++++++ 1 file changed, 14 insertions(+)