libstdc++-v3/testsuite/21_strings/basic_string_view/element_access/char/front_back_constexpr.cc

   1 // Copyright (C) 2020-2024 Free Software Foundation, Inc.
   2 //
   3 // This file is part of the GNU ISO C++ Library.  This library is free
   4 // software; you can redistribute it and/or modify it under the
   5 // terms of the GNU General Public License as published by the
   6 // Free Software Foundation; either version 3, or (at your option)
   7 // any later version.
   8
   9 // This library is distributed in the hope that it will be useful,
  10 // but WITHOUT ANY WARRANTY; without even the implied warranty of
  11 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12 // GNU General Public License for more details.
  13
  14 // You should have received a copy of the GNU General Public License along
  15 // with this library; see the file COPYING3.  If not see
  16 // <http://www.gnu.org/licenses/>.
  17
  18 // { dg-do compile { target c++17 } }
  19
  20 #include <string_view>
  21
  22 typedef std::string_view string_view_type;
  23
  24 constexpr char
  25 front()
  26 {
  27   string_view_type s("abcd");
  28   return s.front();
  29 }
  30
  31 static_assert(front() == 'a');
  32
  33 constexpr char
  34 back()
  35 {
  36   string_view_type s("abcd");
  37   return s.back();
  38 }
  39
  40 static_assert(back() == 'd');