[2/2] libstdc++: use new built-in trait __is_function
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Commit Message
This patch lets libstdc++ use new built-in trait __is_function.
libstdc++-v3/ChangeLog:
* include/std/type_traits (is_function): Use __is_function built-in trait.
---
libstdc++-v3/include/std/type_traits | 7 +++++++
1 file changed, 7 insertions(+)
@@ -594,6 +594,12 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
{ };
/// is_function
+#if __has_builtin(__is_function)
+ template<typename _Tp>
+ struct is_function
+ : public __bool_constant<__is_function(_Tp)>
+ { };
+#else
template<typename _Tp>
struct is_function
: public __bool_constant<!is_const<const _Tp>::value> { };
@@ -605,6 +611,7 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
template<typename _Tp>
struct is_function<_Tp&&>
: public false_type { };
+#endif
#define __cpp_lib_is_null_pointer 201309L