[v7,6/6] libstdc++: make std::is_object dispatch to new built-in traits
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Commit Message
This patch gets std::is_object to dispatch to new built-in traits,
__is_function, __is_reference, and __is_void.
libstdc++-v3/ChangeLog:
* include/std/type_traits (is_object): Use new built-in traits,
__is_function, __is_reference, and __is_void.
(is_object_v): Likewise.
Signed-off-by: Ken Matsui <kmatsui@cs.washington.edu>
---
libstdc++-v3/include/std/type_traits | 18 ++++++++++++++++++
1 file changed, 18 insertions(+)
@@ -682,11 +682,20 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
{ };
/// is_object
+#if __has_builtin(__is_function) && __has_builtin(__is_reference) \
+ && __has_builtin(__is_void)
+ template<typename _Tp>
+ struct is_object
+ : public __bool_constant<!(__is_function(_Tp) || __is_reference(_Tp) ||
+ __is_void(_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;
@@ -3235,8 +3244,17 @@ 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 __has_builtin(__is_function) && __has_builtin(__is_reference) \
+ && __has_builtin(__is_void)
+template <typename _Tp>
+ inline constexpr bool is_object_v
+ = !(__is_function(_Tp) || __is_reference(_Tp) || __is_void(_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>