libstdc++-v3/testsuite/24_iterators/reverse_iterator/71771.cc

   1 // Copyright (C) 2016-2023 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++11 } }
  19
  20 #include <iterator>
  21 #include <testsuite_iterators.h>
  22
  23 // PR libstdc++/71771
  24
  25 template<typename Iter>
  26 auto
  27 diff2(std::reverse_iterator<Iter> it1, std::reverse_iterator<Iter> it2)
  28 -> decltype(it1 - it2)
  29 { return it1 - it2; }
  30
  31 template<typename Iter>
  32 void
  33 diff2(Iter, Iter)
  34 { }
  35
  36 void
  37 test01()
  38 {
  39   int i[2];
  40   __gnu_test::test_container<int, __gnu_test::bidirectional_iterator_wrapper>
  41     c(i);
  42   using reverse_iterator
  43     = std::reverse_iterator<__gnu_test::bidirectional_iterator_wrapper<int>>;
  44   diff2(reverse_iterator(c.end()), reverse_iterator(c.begin()));
  45 }