libstdc++-v3/testsuite/21_strings/basic_string_view/requirements/typedefs.cc

   1
   2 // { dg-do compile { target c++17 } }
   3
   4 // Copyright (C) 2013-2022 Free Software Foundation, Inc.
   5 //
   6 // This file is part of the GNU ISO C++ Library.  This library is free
   7 // software; you can redistribute it and/or modify it under the
   8 // terms of the GNU General Public License as published by the
   9 // Free Software Foundation; either version 3, or (at your option)
  10 // any later version.
  11
  12 // This library is distributed in the hope that it will be useful,
  13 // but WITHOUT ANY WARRANTY; without even the implied warranty of
  14 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15 // GNU General Public License for more details.
  16
  17 // You should have received a copy of the GNU General Public License along
  18 // with this library; see the file COPYING3.  If not see
  19 // <http://www.gnu.org/licenses/>.
  20
  21 #include <string_view>
  22 #include <testsuite_containers.h>
  23
  24 namespace __gnu_test
  25 {
  26   template<typename _Tp1, typename _Tp2>
  27     struct traits<std::basic_string_view<_Tp1, _Tp2>> : public traits_base
  28     {
  29       typedef std::true_type    is_container;
  30       typedef std::true_type    is_reversible;
  31     };
  32 }
  33
  34 #include <testsuite_containers.h>
  35
  36 // Check container for required typedefs.
  37
  38 __gnu_test::basic_types<std::string_view> t1b;
  39 __gnu_test::reversible_types<std::string_view> t1r;
  40 typedef typename std::string_view::traits_type traits_type1;
  41
  42 __gnu_test::basic_types<std::wstring_view> t2b;
  43 __gnu_test::reversible_types<std::wstring_view> t2r;
  44 typedef typename std::wstring_view::traits_type traits_type2;
  45
  46 static_assert(std::is_same<std::string_view::pointer, char*>(),
  47     "pointer should be value_type*");
  48 static_assert(std::is_same<std::string_view::const_pointer, const char*>(),
  49     "const_pointer should be const value_type*");
  50 static_assert(std::is_same<std::string_view::reference, char&>(),
  51     "reference should be value_type&");
  52 static_assert(std::is_same<std::string_view::const_reference, const char&>(),
  53     "const_reference should be const value_type&");