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From: Ken Matsui <kmatsui@gcc.gnu.org>
To: gcc-patches@gcc.gnu.org
Cc: libstdc++@gcc.gnu.org, Ken Matsui <kmatsui@gcc.gnu.org>
Subject: [PATCH v4 2/2] libstdc++: use new built-in trait __is_unsigned
Date: Sat,  8 Jul 2023 04:13:08 -0700	[thread overview]
Message-ID: <20230708111308.92402-2-kmatsui@gcc.gnu.org> (raw)
In-Reply-To: <20230708111308.92402-1-kmatsui@gcc.gnu.org>

This patch lets libstdc++ use new built-in trait __is_unsigned.

libstdc++-v3/ChangeLog:

	* include/std/type_traits (is_unsigned): Use __is_unsigned built-in
	trait.
	(is_unsigned_v): Likewise.

Signed-off-by: Ken Matsui <kmatsui@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..7eeb0da7a27 100644
--- a/libstdc++-v3/include/std/type_traits
+++ b/libstdc++-v3/include/std/type_traits
@@ -884,10 +884,17 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
     { };
 
   /// is_unsigned
+#if __has_builtin(__is_unsigned)
+  template<typename _Tp>
+    struct is_unsigned
+    : public __bool_constant<__is_unsigned(_Tp)>
+    { };
+#else
   template<typename _Tp>
     struct is_unsigned
     : public __and_<is_arithmetic<_Tp>, __not_<is_signed<_Tp>>>::type
     { };
+#endif
 
   /// @cond undocumented
   template<typename _Tp, typename _Up = _Tp&&>
@@ -3242,8 +3249,14 @@ template <typename _Tp>
 
 template <typename _Tp>
   inline constexpr bool is_signed_v = is_signed<_Tp>::value;
+
+#if __has_builtin(__is_unsigned)
+template <typename _Tp>
+  inline constexpr bool is_unsigned_v = __is_unsigned(_Tp);
+#else
 template <typename _Tp>
   inline constexpr bool is_unsigned_v = is_unsigned<_Tp>::value;
+#endif
 
 template <typename _Tp, typename... _Args>
   inline constexpr bool is_constructible_v = __is_constructible(_Tp, _Args...);
-- 
2.41.0


  reply	other threads:[~2023-07-08 11:14 UTC|newest]

Thread overview: 16+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2023-03-21 16:39 [PATCH 1/2] c++: implement __is_unsigned built-in trait Ken Matsui
2023-03-21 16:39 ` [PATCH 2/2] libstdc++: use new built-in trait __is_unsigned Ken Matsui
2023-03-21 16:44   ` Jonathan Wakely
2023-03-21 17:02     ` Ken Matsui
2023-03-23  0:42     ` [PATCH v2 " Ken Matsui
2023-03-21 17:08   ` Ken Matsui
2023-03-21 16:42 ` [PATCH 1/2] c++: implement __is_unsigned built-in trait Jonathan Wakely
2023-03-23  0:41   ` [PATCH v2 " Ken Matsui
2023-07-08  5:54     ` [PATCH v3 " Ken Matsui
2023-07-08 11:13       ` [PATCH v4 " Ken Matsui
2023-07-08 11:13         ` Ken Matsui [this message]
2023-07-12 10:04           ` [PATCH v4 2/2] libstdc++: use new built-in trait __is_unsigned Jonathan Wakely
2023-07-08 11:25         ` [PATCH v4 1/2] c++: implement __is_unsigned built-in trait Ken Matsui
2023-09-04 15:00           ` [PING][PATCH " Ken Matsui
2023-03-21 17:06 ` [PATCH v2 " Ken Matsui
2023-03-22 21:23   ` Ken Matsui

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