diff mbox series

[2/2] libstdc++: use new built-in trait __is_function

Message ID 20230321142159.86694-2-kmatsui@cs.washington.edu
State New
Headers show
Series [1/2] c++: implement __is_function built-in trait | expand

Commit Message

Ken Matsui March 21, 2023, 2:21 p.m. UTC 
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(+)
diff mbox series

Patch

diff --git a/libstdc++-v3/include/std/type_traits b/libstdc++-v3/include/std/type_traits
index 2bd607a8b8f..d008d5eb67d 100644
--- a/libstdc++-v3/include/std/type_traits
+++ b/libstdc++-v3/include/std/type_traits
@@ -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