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From: Ken Matsui <kmatsui@cs.washington.edu>
To: gcc-patches@gcc.gnu.org
Cc: Patrick Palka <ppalka@redhat.com>
Subject: [PATCH] libstdc++: use new built-in trait __is_reference
Date: Sat, 18 Mar 2023 21:21:46 -0700	[thread overview]
Message-ID: <CAML+3pVYKw0zzseC1H+yKwO5L77S001qcvwgwh80AizD80djOw@mail.gmail.com> (raw)

libstdc++-v3/ChangeLog:

* include/std/type_traits (is_reference): Use __is_reference built-in trait.
---
diff --git a/libstdc++-v3/include/std/type_traits
b/libstdc++-v3/include/std/type_traits
index 2bd607a8b8f..18408d8ceb6 100644
--- a/libstdc++-v3/include/std/type_traits
+++ b/libstdc++-v3/include/std/type_traits
@@ -639,6 +639,12 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
   // Composite type categories.

   /// is_reference
+#if __has_builtin(__is_reference)
+  template<typename _Tp>
+    struct is_reference
+    : public integral_constant<bool, __is_reference(_Tp)>
+    { };
+#else
   template<typename _Tp>
     struct is_reference
     : public false_type
@@ -653,6 +659,7 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
     struct is_reference<_Tp&&>
     : public true_type
     { };
+#endif

   /// is_arithmetic
   template<typename _Tp>

             reply	other threads:[~2023-03-19  4:21 UTC|newest]

Thread overview: 12+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2023-03-19  4:21 Ken Matsui [this message]
2023-03-20  7:25 ` Xi Ruoyao
2023-03-20  7:30   ` Ken Matsui
2023-03-20  7:51     ` Xi Ruoyao
2023-03-20  8:03       ` Ken Matsui
2023-03-20  8:07         ` Xi Ruoyao
2023-03-20  8:32           ` Ken Matsui
2023-03-20  9:14           ` Jonathan Wakely
2023-03-20  9:56             ` Ken Matsui
2023-03-20 13:22               ` Ken Matsui
2023-03-20 15:23               ` Patrick Palka
2023-03-20 20:24                 ` Ken Matsui

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