libstdc++-v3/testsuite/24_iterators/istreambuf_iterator/sentinel.cc

   1 // { dg-options "-std=gnu++2a" }
   2 // { dg-do run { target c++2a } }
   3
   4 // Copyright (C) 2020-2022 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 <iterator>
  22 #include <sstream>
  23 #include <testsuite_hooks.h>
  24
  25 void
  26 test01()
  27 {
  28   static_assert( std::sentinel_for<std::default_sentinel_t,
  29                                    std::istreambuf_iterator<char>> );
  30
  31   std::istreambuf_iterator<char> i = std::default_sentinel;
  32   VERIFY( i == std::default_sentinel );
  33   VERIFY( std::default_sentinel == i );
  34 }
  35
  36 void
  37 test02()
  38 {
  39   std::istringstream in("abc");
  40   std::istreambuf_iterator<char> iter(in);
  41   VERIFY( iter != std::default_sentinel );
  42   VERIFY( std::default_sentinel != iter );
  43
  44   (void) std::next(iter, 3);
  45   VERIFY( iter == std::default_sentinel );
  46   VERIFY( std::default_sentinel == iter );
  47 }
  48
  49 int main()
  50 {
  51   test01();
  52   test02();
  53 }