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libstdc++: Fix fallback definitions of std::is_member_*_pointer

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When the builtins aren't used we need a declaration of std::is_function
for the fallback definitions of std::is_member_function_pointer and
std::is_member_object_pointer.

libstdc++-v3/ChangeLog:

	* include/std/type_traits (is_function): Declare before first
	use.
This commit is contained in:
Jonathan Wakely
2026-02-12 19:36:16 +00:00
committed by Jonathan Wakely
parent e4c21d8485
commit db072f75e5
1 changed files with 6 additions and 0 deletions
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libstdc++-v3/include/std/type_traits
+6
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@@ -674,6 +674,9 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
: public __bool_constant<__is_member_object_pointer(_Tp)>
{ };
#else
template<typename _Tp>
struct is_function;
template<typename>
struct __is_member_object_pointer_helper
: public false_type { };
@@ -696,6 +699,9 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
: public __bool_constant<__is_member_function_pointer(_Tp)>
{ };
#else
template<typename _Tp>
struct is_function;
template<typename>
struct __is_member_function_pointer_helper
: public false_type { };