* [PATCH] Constexpr in std::pointer_traits (P1006R1)
@ 2019-03-06 12:13 Jonathan Wakely
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From: Jonathan Wakely @ 2019-03-06 12:13 UTC (permalink / raw)
To: libstdc++, gcc-patches
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* include/bits/ptr_traits.h [C++20] (pointer_traits<T*>::pointer_to):
Add constexpr.
* testsuite/20_util/pointer_traits/pointer_to_constexpr.cc: New test.
Tested powerpc64le-linux, committed to trunk.
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commit 8125740feaa7aa66589d0922992b9bf1065e1699
Author: Jonathan Wakely <jwakely@redhat.com>
Date: Wed Mar 6 10:45:02 2019 +0000
Constexpr in std::pointer_traits (P1006R1)
* include/bits/ptr_traits.h [C++20] (pointer_traits<T*>::pointer_to):
Add constexpr.
* testsuite/20_util/pointer_traits/pointer_to_constexpr.cc: New test.
diff --git a/libstdc++-v3/include/bits/ptr_traits.h b/libstdc++-v3/include/bits/ptr_traits.h
index 76355863852..c90a35080f1 100644
--- a/libstdc++-v3/include/bits/ptr_traits.h
+++ b/libstdc++-v3/include/bits/ptr_traits.h
@@ -137,7 +137,7 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
* @param __r A reference to an object of type @c element_type
* @return @c addressof(__r)
*/
- static pointer
+ static _GLIBCXX20_CONSTEXPR pointer
pointer_to(__make_not_void<element_type>& __r) noexcept
{ return std::addressof(__r); }
};
diff --git a/libstdc++-v3/testsuite/20_util/pointer_traits/pointer_to_constexpr.cc b/libstdc++-v3/testsuite/20_util/pointer_traits/pointer_to_constexpr.cc
new file mode 100644
index 00000000000..ed4f2157adc
--- /dev/null
+++ b/libstdc++-v3/testsuite/20_util/pointer_traits/pointer_to_constexpr.cc
@@ -0,0 +1,27 @@
+// Copyright (C) 2019 Free Software Foundation, Inc.
+//
+// This file is part of the GNU ISO C++ Library. This library is free
+// software; you can redistribute it and/or modify it under the
+// terms of the GNU General Public License as published by the
+// Free Software Foundation; either version 3, or (at your option)
+// any later version.
+
+// This library is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+// GNU General Public License for more details.
+
+// You should have received a copy of the GNU General Public License along
+// with this library; see the file COPYING3. If not see
+// <http://www.gnu.org/licenses/>.
+
+// { dg-options "-std=gnu++2a" }
+// { dg-do compile { target c++2a } }
+
+#include <memory>
+
+int i = 0;
+static_assert( std::pointer_traits<int*>::pointer_to(i) == &i );
+
+struct X { } x;
+static_assert( std::pointer_traits<X*>::pointer_to(x) == &x );
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