public inbox for gcc-cvs@sourceware.org
help / color / mirror / Atom feed
* [gcc r13-3067] libstdc++: Use new built-ins __remove_cv, __remove_reference etc.
@ 2022-10-04 16:46 Jonathan Wakely
  0 siblings, 0 replies; only message in thread
From: Jonathan Wakely @ 2022-10-04 16:46 UTC (permalink / raw)
  To: gcc-cvs, libstdc++-cvs

https://gcc.gnu.org/g:6ddbbbffbb5759a6c1d56c191364a6bd021f733e

commit r13-3067-g6ddbbbffbb5759a6c1d56c191364a6bd021f733e
Author: Jonathan Wakely <jwakely@redhat.com>
Date:   Tue Oct 4 13:00:52 2022 +0100

    libstdc++: Use new built-ins __remove_cv, __remove_reference etc.
    
    libstdc++-v3/ChangeLog:
    
            * include/std/type_traits (remove_cv): Use __remove_cv built-in.
            (remove_reference): Use __remove_reference built-in.
            (remove_cvref): Use __remove_cvref built-in. Remove inheritance
            for fallback implementation.

Diff:
---
 libstdc++-v3/include/std/type_traits | 33 ++++++++++++++++++++++++---------
 1 file changed, 24 insertions(+), 9 deletions(-)

diff --git a/libstdc++-v3/include/std/type_traits b/libstdc++-v3/include/std/type_traits
index a015fd95a71..b74565eb521 100644
--- a/libstdc++-v3/include/std/type_traits
+++ b/libstdc++-v3/include/std/type_traits
@@ -1507,6 +1507,11 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
     { typedef _Tp     type; };
 
   /// remove_cv
+#if __has_builtin(__remove_cv)
+  template<typename _Tp>
+    struct remove_cv
+    { using type = __remove_cv(_Tp); };
+#else
   template<typename _Tp>
     struct remove_cv
     { using type = _Tp; };
@@ -1522,6 +1527,7 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
   template<typename _Tp>
     struct remove_cv<const volatile _Tp>
     { using type = _Tp; };
+#endif
 
   /// add_const
   template<typename _Tp>
@@ -1570,17 +1576,23 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
   // Reference transformations.
 
   /// remove_reference
+#if __has_builtin(__remove_reference)
   template<typename _Tp>
     struct remove_reference
-    { typedef _Tp   type; };
+    { using type = __remove_reference(_Tp); };
+#else
+  template<typename _Tp>
+    struct remove_reference
+    { using type = _Tp; };
 
   template<typename _Tp>
     struct remove_reference<_Tp&>
-    { typedef _Tp   type; };
+    { using type = _Tp; };
 
   template<typename _Tp>
     struct remove_reference<_Tp&&>
-    { typedef _Tp   type; };
+    { using type = _Tp; };
+#endif
 
   /// add_lvalue_reference
   template<typename _Tp>
@@ -3358,20 +3370,23 @@ template<typename _Ret, typename _Fn, typename... _Args>
    */
 #define __cpp_lib_remove_cvref 201711L
 
+#if __has_builtin(__remove_cvref)
   template<typename _Tp>
     struct remove_cvref
-    : remove_cv<_Tp>
-    { };
+    { using type = __remove_cvref(_Tp); };
+#else
+  template<typename _Tp>
+    struct remove_cvref
+    { using type = typename remove_cv<_Tp>::type; };
 
   template<typename _Tp>
     struct remove_cvref<_Tp&>
-    : remove_cv<_Tp>
-    { };
+    { using type = typename remove_cv<_Tp>::type; };
 
   template<typename _Tp>
     struct remove_cvref<_Tp&&>
-    : remove_cv<_Tp>
-    { };
+    { using type = typename remove_cv<_Tp>::type; };
+#endif
 
   template<typename _Tp>
     using remove_cvref_t = typename remove_cvref<_Tp>::type;

^ permalink raw reply	[flat|nested] only message in thread

only message in thread, other threads:[~2022-10-04 16:46 UTC | newest]

Thread overview: (only message) (download: mbox.gz / follow: Atom feed)
-- links below jump to the message on this page --
2022-10-04 16:46 [gcc r13-3067] libstdc++: Use new built-ins __remove_cv, __remove_reference etc Jonathan Wakely

This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for read-only IMAP folder(s) and NNTP newsgroup(s).