[v2,2/2] libstdc++: use new built-in trait __is_pointer
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Commit Message
This patch lets libstdc++ use new built-in trait __is_pointer.
libstdc++-v3/ChangeLog:
* include/std/type_traits (is_pointer): Use __is_pointer
built-in trait.
(is_pointer_v): Likewise.
Signed-off-by: Ken Matsui <kmatsui@gcc.gnu.org>
---
libstdc++-v3/include/std/type_traits | 15 ++++++++++++++-
1 file changed, 14 insertions(+), 1 deletion(-)
@@ -515,6 +515,13 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
struct is_array<_Tp[]>
: public true_type { };
+ /// is_pointer
+#if __has_builtin(__is_pointer)
+ template<typename _Tp>
+ struct is_pointer
+ : public __bool_constant<__is_pointer(_Tp)>
+ { };
+#else
template<typename>
struct __is_pointer_helper
: public false_type { };
@@ -523,11 +530,11 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
struct __is_pointer_helper<_Tp*>
: public true_type { };
- /// is_pointer
template<typename _Tp>
struct is_pointer
: public __is_pointer_helper<__remove_cv_t<_Tp>>::type
{ };
+#endif
/// is_lvalue_reference
template<typename>
@@ -3168,8 +3175,14 @@ template <typename _Tp>
template <typename _Tp, size_t _Num>
inline constexpr bool is_array_v<_Tp[_Num]> = true;
+#if __has_builtin(__is_pointer)
+template <typename _Tp>
+ inline constexpr bool is_pointer_v = __is_pointer(_Tp);
+#else
template <typename _Tp>
inline constexpr bool is_pointer_v = is_pointer<_Tp>::value;
+#endif
+
template <typename _Tp>
inline constexpr bool is_lvalue_reference_v = false;
template <typename _Tp>