Add tests for std::remove_cvref

	* testsuite/20_util/remove_cvref/requirements/alias_decl.cc: New.
	* testsuite/20_util/remove_cvref/requirements/explicit_instantiation.cc:
	New.
	* testsuite/20_util/remove_cvref/value.cc: New.
	* testsuite/20_util/remove_cvref/value_ext.cc: New.

From-SVN: r259896

libstdc++-v3/ChangeLog

 2018-05-03  Jonathan Wakely  <jwakely@redhat.com>
 
+	* testsuite/20_util/remove_cvref/requirements/alias_decl.cc: New.
+	* testsuite/20_util/remove_cvref/requirements/explicit_instantiation.cc:
+	New.
+	* testsuite/20_util/remove_cvref/value.cc: New.
+	* testsuite/20_util/remove_cvref/value_ext.cc: New.
+
 	PR libstdc++/84087 LWG DR 2268 basic_string default arguments
 	* include/bits/basic_string.h [_GLIBCXX_USE_CXX11_ABI=1]
 	(append(const basic_string&, size_type, size_type)

libstdc++-v3/testsuite/20_util/remove_cvref/requirements/alias_decl.cc

+// { dg-options "-std=gnu++2a" }
+// { dg-do compile { target c++2a } }
+
+// Copyright (C) 2018 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/>.
+
+// NB: This file is for testing type_traits with NO OTHER INCLUDES.
+
+#include <type_traits>
+
+using namespace std;
+
+static_assert (is_same<typename remove_cvref<int>::type,
+	               remove_cvref_t<int>>(),
+               "remove_cvref_t" );
+
+static_assert (is_same<typename remove_cvref<const volatile long&>::type,
+                       remove_cvref_t<const volatile long&>>(),
+	       "remove_cvref_t" );
+
+static_assert (is_same<typename remove_cvref<const short&&>::type,
+                       remove_cvref_t<const short&&>>(),
+	       "remove_cvref_t" );

libstdc++-v3/testsuite/20_util/remove_cvref/requirements/explicit_instantiation.cc

+// { dg-options "-std=gnu++2a" }
+// { dg-do compile { target c++2a } }
+
+// Copyright (C) 2018 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/>.
+
+// NB: This file is for testing type_traits with NO OTHER INCLUDES.
+
+#include <type_traits>
+
+namespace std
+{
+  typedef short test_type;
+  template struct remove_cvref<test_type>;
+}

libstdc++-v3/testsuite/20_util/remove_cvref/value.cc

+// { dg-options "-std=gnu++2a" }
+// { dg-do compile { target c++2a } }
+
+// Copyright (C) 2018 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/>.
+
+#include <type_traits>
+#include <testsuite_tr1.h>
+
+void test01()
+{
+  using std::remove_cvref;
+  using std::is_same;
+  using namespace __gnu_test;
+
+  static_assert(is_same<remove_cvref<const volatile int>::type,
+			int>::value, "");
+  static_assert(is_same<remove_cvref<const volatile int*>::type,
+			const volatile int*>::value, "");
+  static_assert(is_same<typename remove_cvref<const volatile int&>::type,
+			int>::value, "");
+  static_assert(is_same<typename remove_cvref<const volatile int&&>::type,
+			int>::value, "");
+  static_assert(is_same<remove_cvref<const volatile ClassType>::type,
+			ClassType>::value, "");
+  static_assert(is_same<remove_cvref<const volatile ClassType*>::type,
+			const volatile ClassType*>::value, "");
+  static_assert(is_same<typename remove_cvref<const volatile ClassType&>::type,
+			ClassType>::value, "");
+  static_assert(is_same<typename remove_cvref<const volatile ClassType&&>::type,
+			ClassType>::value, "");
+  static_assert(is_same<typename remove_cvref<const int(&)[3]>::type,
+			int[3]>::value, "");
+  static_assert(is_same<typename remove_cvref<const int(&)()>::type,
+			const int()>::value, "");
+}

libstdc++-v3/testsuite/20_util/remove_cvref/value_ext.cc

+// { dg-do compile { target c++11 } }
+
+// Copyright (C) 2018 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/>.
+
+#include <type_traits>
+#include <testsuite_tr1.h>
+
+void test01()
+{
+  using std::__remove_cvref_t;
+  using std::is_same;
+  using namespace __gnu_test;
+
+  static_assert(is_same<__remove_cvref_t<const volatile int>,
+			int>::value, "");
+  static_assert(is_same<__remove_cvref_t<const volatile int*>,
+			const volatile int*>::value, "");
+  static_assert(is_same<__remove_cvref_t<const volatile int&>,
+			int>::value, "");
+  static_assert(is_same<__remove_cvref_t<const volatile int&&>,
+			int>::value, "");
+  static_assert(is_same<__remove_cvref_t<const volatile ClassType>,
+			ClassType>::value, "");
+  static_assert(is_same<__remove_cvref_t<const volatile ClassType*>,
+			const volatile ClassType*>::value, "");
+  static_assert(is_same<__remove_cvref_t<const volatile ClassType&>,
+			ClassType>::value, "");
+  static_assert(is_same<__remove_cvref_t<const volatile ClassType&&>,
+			ClassType>::value, "");
+  static_assert(is_same<__remove_cvref_t<const int(&)[3]>,
+			int[3]>::value, "");
+  static_assert(is_same<__remove_cvref_t<const int(&)()>,
+			const int()>::value, "");
+}