Ping for the use of __is_volatile built-in.
Sincerely,
Ken Matsui
On Fri, Jul 7, 2023 at 10:19 PM Ken Matsui <kmat...@gcc.gnu.org> wrote:
>
> This patch lets libstdc++ use new built-in trait __is_volatile.
>
> libstdc++-v3/ChangeLog:
>
> * include/std/type_traits (is_volatile): Use __is_volatile built-in
> trait.
> (is_volatile_v): Likewise.
>
> Signed-off-by: Ken Matsui <kmat...@gcc.gnu.org>
> ---
> libstdc++-v3/include/std/type_traits | 13 +++++++++++++
> 1 file changed, 13 insertions(+)
>
> diff --git a/libstdc++-v3/include/std/type_traits
> b/libstdc++-v3/include/std/type_traits
> index 0e7a9c9c7f3..db74b884b35 100644
> --- a/libstdc++-v3/include/std/type_traits
> +++ b/libstdc++-v3/include/std/type_traits
> @@ -773,6 +773,12 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
> : public true_type { };
>
> /// is_volatile
> +#if __has_builtin(__is_volatile)
> + template<typename _Tp>
> + struct is_volatile
> + : public __bool_constant<__is_volatile(_Tp)>
> + { };
> +#else
> template<typename>
> struct is_volatile
> : public false_type { };
> @@ -780,6 +786,7 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
> template<typename _Tp>
> struct is_volatile<_Tp volatile>
> : public true_type { };
> +#endif
>
> /// is_trivial
> template<typename _Tp>
> @@ -3214,10 +3221,16 @@ template <typename _Tp>
> inline constexpr bool is_const_v = false;
> template <typename _Tp>
> inline constexpr bool is_const_v<const _Tp> = true;
> +
> +#if __has_builtin(__is_volatile)
> +template <typename _Tp>
> + inline constexpr bool is_volatile_v = __is_volatile(_Tp);
> +#else
> template <typename _Tp>
> inline constexpr bool is_volatile_v = false;
> template <typename _Tp>
> inline constexpr bool is_volatile_v<volatile _Tp> = true;
> +#endif
>
> template <typename _Tp>
> inline constexpr bool is_trivial_v = __is_trivial(_Tp);
> --
> 2.41.0
>
