-// { dg-do compile }
-// { dg-options "-std=gnu++11" }
+// { dg-do compile { target c++11 } }
-// Copyright (C) 2013-2015 Free Software Foundation, Inc.
+// Copyright (C) 2013-2020 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
// with this library; see the file COPYING3. If not see
// <http://www.gnu.org/licenses/>.
+// NB: Don't include any other headers in this file.
+// LWG 2212 requires <utility> to define tuple_size<cv T> and
+// tuple_element<cv T> specializations.
#include <utility>
-#include <type_traits>
typedef std::pair<int, long> test_type;
static_assert( std::tuple_size<test_type>::value == 2, "size is 2" );
+static_assert( std::tuple_size<const test_type>::value == 2, "size is 2" );
+static_assert( std::tuple_size<volatile test_type>::value == 2, "size is 2" );
+static_assert( std::tuple_size<const volatile test_type>::value == 2,
+ "size is 2" );
template<std::size_t N, typename T>
using Tuple_elt = typename std::tuple_element<N, T>::type;
+// This relies on the fact that <utility> includes <type_traits>:
using std::is_same;
static_assert( is_same<Tuple_elt<0, test_type>, test_type::first_type>::value,
static_assert( is_same<Tuple_elt<1, test_type>, test_type::second_type>::value,
"second type is long" );
+
+static_assert( is_same<Tuple_elt<0, const test_type>,
+ const test_type::first_type>::value,
+ "first type is const int" );
+
+static_assert( is_same<Tuple_elt<1, const test_type>,
+ const test_type::second_type>::value,
+ "second type is const long" );
+
+static_assert( is_same<Tuple_elt<0, volatile test_type>,
+ volatile test_type::first_type>::value,
+ "first type is volatile int" );
+
+static_assert( is_same<Tuple_elt<1, volatile test_type>,
+ volatile test_type::second_type>::value,
+ "second type is volatile long" );
+
+static_assert( is_same<Tuple_elt<0, const volatile test_type>,
+ const volatile test_type::first_type>::value,
+ "first type is const volatile int" );
+
+static_assert( is_same<Tuple_elt<1, const volatile test_type>,
+ const volatile test_type::second_type>::value,
+ "second type is const volatile long" );