libstdc++-v3/testsuite/20_util/pair/astuple/astuple_cpp14.cc

   1 // { dg-do compile { target c++14 } }
   2
   3 // Copyright (C) 2015-2024 Free Software Foundation, Inc.
   4 //
   5 // This file is part of the GNU ISO C++ Library.  This library is free
   6 // software; you can redistribute it and/or modify it under the
   7 // terms of the GNU General Public License as published by the
   8 // Free Software Foundation; either version 3, or (at your option)
   9 // any later version.
  10 //
  11 // This library is distributed in the hope that it will be useful,
  12 // but WITHOUT ANY WARRANTY; without even the implied warranty of
  13 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14 // GNU General Public License for more details.
  15 //
  16 // You should have received a copy of the GNU General Public License along
  17 // with this library; see the file COPYING3.  If not see
  18 // <http://www.gnu.org/licenses/>.
  19
  20 #include <utility>
  21 #include <type_traits>
  22
  23 typedef std::pair<int, long> test_type;
  24
  25 template<std::size_t N, typename T>
  26   using Tuple_elt = std::tuple_element_t<N, T>;
  27
  28 using std::is_same;
  29
  30 static_assert( is_same<Tuple_elt<0, test_type>, test_type::first_type>::value,
  31                "first type is int" );
  32
  33 static_assert( is_same<Tuple_elt<1, test_type>, test_type::second_type>::value,
  34                "second type is long" );
  35
  36 static_assert( is_same<Tuple_elt<0, const test_type>,
  37                const test_type::first_type>::value,
  38                "first type is const int" );
  39
  40 static_assert( is_same<Tuple_elt<1, const test_type>,
  41                const test_type::second_type>::value,
  42                "second type is const long" );
  43
  44 static_assert( is_same<Tuple_elt<0, volatile test_type>,
  45                volatile test_type::first_type>::value,
  46                "first type is volatile int" );
  47
  48 static_assert( is_same<Tuple_elt<1, volatile test_type>,
  49                volatile test_type::second_type>::value,
  50                "second type is volatile long" );
  51
  52 static_assert( is_same<Tuple_elt<0, const volatile test_type>,
  53                const volatile test_type::first_type>::value,
  54                "first type is const volatile int" );
  55
  56 static_assert( is_same<Tuple_elt<1, const volatile test_type>,
  57                const volatile test_type::second_type>::value,
  58                "second type is const volatile long" );