[gcc(refs/vendors/ARM/heads/arm-struct-reorg-wip)] libstdc++: Add __cpp_lib_unwrap_ref feature test macro
Tamar Christina
tnfchris@gcc.gnu.org
Fri Jul 17 13:01:19 GMT 2020
https://gcc.gnu.org/g:bb54e0b8794dfeea1f59ed9ca6433df1eccb85e9
commit bb54e0b8794dfeea1f59ed9ca6433df1eccb85e9
Author: Jonathan Wakely <jwakely@redhat.com>
Date: Wed Feb 19 15:06:24 2020 +0000
libstdc++: Add __cpp_lib_unwrap_ref feature test macro
We already defined the traits in <type_traits> as now required by LWG
3348, but the macro was missing. This adds it.
* include/std/type_traits (__cpp_lib_unwrap_ref): Define (LWG 3348).
* include/std/version (__cpp_lib_unwrap_ref): Likewise.
* testsuite/20_util/unwrap_reference/1.cc: Check macro.
* testsuite/20_util/unwrap_reference/3.cc: New test.
Diff:
---
libstdc++-v3/ChangeLog | 5 ++++
libstdc++-v3/include/std/type_traits | 2 ++
libstdc++-v3/include/std/version | 1 +
.../testsuite/20_util/unwrap_reference/1.cc | 6 +++++
.../testsuite/20_util/unwrap_reference/3.cc | 27 ++++++++++++++++++++++
5 files changed, 41 insertions(+)
diff --git a/libstdc++-v3/ChangeLog b/libstdc++-v3/ChangeLog
index 84e5ea98022..bc4ce773f1e 100644
--- a/libstdc++-v3/ChangeLog
+++ b/libstdc++-v3/ChangeLog
@@ -1,5 +1,10 @@
2020-02-19 Jonathan Wakely <jwakely@redhat.com>
+ * include/std/type_traits (__cpp_lib_unwrap_ref): Define (LWG 3348).
+ * include/std/version (__cpp_lib_unwrap_ref): Likewise.
+ * testsuite/20_util/unwrap_reference/1.cc: Check macro.
+ * testsuite/20_util/unwrap_reference/3.cc: New test.
+
* include/std/numeric (midpoint(T8, T*)): Do not check for complete
type during overload resolution, use static assert instead (LWG 3200).
* testsuite/26_numerics/midpoint/pointer.cc: Do not test with
diff --git a/libstdc++-v3/include/std/type_traits b/libstdc++-v3/include/std/type_traits
index 684a792d02c..14aa2b37a4f 100644
--- a/libstdc++-v3/include/std/type_traits
+++ b/libstdc++-v3/include/std/type_traits
@@ -3242,6 +3242,8 @@ template <typename _From, typename _To>
template<typename _Tp>
using type_identity_t = typename type_identity<_Tp>::type;
+#define __cpp_lib_unwrap_ref 201811L
+
/// Unwrap a reference_wrapper
template<typename _Tp>
struct unwrap_reference { using type = _Tp; };
diff --git a/libstdc++-v3/include/std/version b/libstdc++-v3/include/std/version
index b36b999cb31..e2ccf619d4a 100644
--- a/libstdc++-v3/include/std/version
+++ b/libstdc++-v3/include/std/version
@@ -178,6 +178,7 @@
#ifdef _GLIBCXX_HAVE_BUILTIN_IS_CONSTANT_EVALUATED
# define __cpp_lib_is_constant_evaluated 201811L
#endif
+#define __cpp_lib_unwrap_ref 201811L
#if _GLIBCXX_HOSTED
#define __cpp_lib_bind_front 201907L
diff --git a/libstdc++-v3/testsuite/20_util/unwrap_reference/1.cc b/libstdc++-v3/testsuite/20_util/unwrap_reference/1.cc
index 3a663433911..3496204e4d2 100644
--- a/libstdc++-v3/testsuite/20_util/unwrap_reference/1.cc
+++ b/libstdc++-v3/testsuite/20_util/unwrap_reference/1.cc
@@ -20,6 +20,12 @@
#include <type_traits>
+#ifndef __cpp_lib_unwrap_ref
+# error "Feature-test macro for unwrap_reference missing in <type_traits>"
+#elif __cpp_lib_unwrap_ref != 201811L
+# error "Feature-test macro for unwrap_reference has wrong value in <type_traits>"
+#endif
+
template<typename T, typename U> struct expect_same;
template<typename T> struct expect_same<T, T> : std::true_type { };
diff --git a/libstdc++-v3/testsuite/20_util/unwrap_reference/3.cc b/libstdc++-v3/testsuite/20_util/unwrap_reference/3.cc
new file mode 100644
index 00000000000..3ea9cd18a05
--- /dev/null
+++ b/libstdc++-v3/testsuite/20_util/unwrap_reference/3.cc
@@ -0,0 +1,27 @@
+// Copyright (C) 2020 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 <version>
+
+#ifndef __cpp_lib_unwrap_ref
+# error "Feature-test macro for unwrap_reference missing in <version>"
+#elif __cpp_lib_unwrap_ref != 201811L
+# error "Feature-test macro for unwrap_reference has wrong value in <version>"
+#endif
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