libstdc++-v3/testsuite/24_iterators/counted_iterator/lwg3389.cc

   1 // Copyright (C) 2020 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-options "-std=gnu++2a" }
  19 // { dg-do compile { target c++2a } }
  20
  21 #include <iterator>
  22
  23 #include <testsuite_iterators.h>
  24
  25 using __gnu_test::test_range;
  26 using __gnu_test::input_iterator_wrapper;
  27
  28 template<typename T>
  29 struct move_only_wrapper : input_iterator_wrapper<T>
  30 {
  31   using input_iterator_wrapper<T>::input_iterator_wrapper;
  32
  33   move_only_wrapper()
  34     : input_iterator_wrapper<T>(nullptr, nullptr)
  35   { }
  36
  37   move_only_wrapper(const move_only_wrapper&) = delete;
  38   move_only_wrapper&
  39   operator=(const move_only_wrapper&) = delete;
  40
  41   move_only_wrapper(move_only_wrapper&&) = default;
  42   move_only_wrapper&
  43   operator=(move_only_wrapper&&) = default;
  44
  45   using input_iterator_wrapper<T>::operator++;
  46
  47   move_only_wrapper&
  48   operator++()
  49   {
  50     input_iterator_wrapper<T>::operator++();
  51     return *this;
  52   }
  53 };
  54
  55 static_assert(std::input_iterator<move_only_wrapper<int>>);
  56 static_assert(!std::forward_iterator<move_only_wrapper<int>>);
  57 static_assert(!std::copyable<move_only_wrapper<int>>);
  58
  59 // LWG 3389
  60 void
  61 test01()
  62 {
  63   int x[] = {1,2,3,4};
  64   test_range<int, move_only_wrapper> rx(x);
  65   auto it = std::counted_iterator(rx.begin(), 2);
  66 }