[v3,2/2] libstdc++: use new built-in trait __is_const
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Commit Message
This patch lets libstdc++ use new built-in trait __is_const.
libstdc++-v3/ChangeLog:
* include/std/type_traits (is_const): Use __is_const built-in trait.
(is_const_v): Likewise.
Signed-off-by: Ken Matsui <kmatsui@gcc.gnu.org>
---
libstdc++-v3/include/std/type_traits | 14 ++++++++++++++
1 file changed, 14 insertions(+)
Comments
Ping for the use of __is_const built-in.
Sincerely,
Ken Matsui
On Fri, Jul 7, 2023 at 10:27 PM Ken Matsui <kmatsui@gcc.gnu.org> wrote:
>
> This patch lets libstdc++ use new built-in trait __is_const.
>
> libstdc++-v3/ChangeLog:
>
> * include/std/type_traits (is_const): Use __is_const built-in trait.
> (is_const_v): Likewise.
>
> Signed-off-by: Ken Matsui <kmatsui@gcc.gnu.org>
> ---
> libstdc++-v3/include/std/type_traits | 14 ++++++++++++++
> 1 file changed, 14 insertions(+)
>
> diff --git a/libstdc++-v3/include/std/type_traits b/libstdc++-v3/include/std/type_traits
> index 0e7a9c9c7f3..3a46eca5377 100644
> --- a/libstdc++-v3/include/std/type_traits
> +++ b/libstdc++-v3/include/std/type_traits
> @@ -764,6 +764,12 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
> // Type properties.
>
> /// is_const
> +#if __has_builtin(__is_const)
> + template<typename _Tp>
> + struct is_const
> + : public __bool_constant<__is_const(_Tp)>
> + { };
> +#else
> template<typename>
> struct is_const
> : public false_type { };
> @@ -771,6 +777,7 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
> template<typename _Tp>
> struct is_const<_Tp const>
> : public true_type { };
> +#endif
>
> /// is_volatile
> template<typename>
> @@ -3210,10 +3217,17 @@ template <typename _Tp>
> inline constexpr bool is_compound_v = is_compound<_Tp>::value;
> template <typename _Tp>
> inline constexpr bool is_member_pointer_v = is_member_pointer<_Tp>::value;
> +
> +#if __has_builtin(__is_const)
> +template <typename _Tp>
> + inline constexpr bool is_const_v = __is_const(_Tp);
> +#else
> template <typename _Tp>
> inline constexpr bool is_const_v = false;
> template <typename _Tp>
> inline constexpr bool is_const_v<const _Tp> = true;
> +#endif
> +
> template <typename _Tp>
> inline constexpr bool is_volatile_v = false;
> template <typename _Tp>
> --
> 2.41.0
>
@@ -764,6 +764,12 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
// Type properties.
/// is_const
+#if __has_builtin(__is_const)
+ template<typename _Tp>
+ struct is_const
+ : public __bool_constant<__is_const(_Tp)>
+ { };
+#else
template<typename>
struct is_const
: public false_type { };
@@ -771,6 +777,7 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
template<typename _Tp>
struct is_const<_Tp const>
: public true_type { };
+#endif
/// is_volatile
template<typename>
@@ -3210,10 +3217,17 @@ template <typename _Tp>
inline constexpr bool is_compound_v = is_compound<_Tp>::value;
template <typename _Tp>
inline constexpr bool is_member_pointer_v = is_member_pointer<_Tp>::value;
+
+#if __has_builtin(__is_const)
+template <typename _Tp>
+ inline constexpr bool is_const_v = __is_const(_Tp);
+#else
template <typename _Tp>
inline constexpr bool is_const_v = false;
template <typename _Tp>
inline constexpr bool is_const_v<const _Tp> = true;
+#endif
+
template <typename _Tp>
inline constexpr bool is_volatile_v = false;
template <typename _Tp>