libstdc++-v3/testsuite/20_util/integral_constant/requirements/constexpr_data.cc

   1 // { dg-do compile { target c++11 } }
   2
   3 // Copyright (C) 2013-2017 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 <type_traits>
  21 #include <testsuite_common_types.h>
  22
  23 namespace __gnu_test
  24 {
  25   struct constexpr_member_data
  26   {
  27     template<typename _Ttesttype>
  28       void
  29       operator()()
  30       {
  31         struct _Concept
  32         {
  33           void __constraint()
  34           {
  35             constexpr auto v __attribute__((unused)) (_Ttesttype::value);
  36           }
  37         };
  38
  39         _Concept c;
  40         c.__constraint();
  41       }
  42   };
  43 }
  44
  45 int main()
  46 {
  47   __gnu_test::constexpr_member_data test;
  48   test.operator()<std::integral_constant<unsigned short, 69>>();
  49   test.operator()<std::integral_constant<bool, true>>();
  50   return 0;
  51 }