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// { dg-options "-std=gnu++0x" }

//

// Copyright (C) 2012 Free Software Foundation, Inc.

//

// This file is part of the GNU ISO C++ Library.  This library is free

// software; you can redistribute it and/or modify it under the

// terms of the GNU General Public License as published by the

// Free Software Foundation; either version 3, or (at your option)

// any later version.

//

// This library is distributed in the hope that it will be useful,

// but WITHOUT ANY WARRANTY; without even the implied warranty of

// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the

// GNU General Public License for more details.

//

// You should have received a copy of the GNU General Public License along

// with this library; see the file COPYING3.  If not see

// <http://www.gnu.org/licenses/>.

#include <unordered_map>

#include <testsuite_hooks.h>

struct num

{

  int value;

  num(int n)                 : value(n) {}

  num(num const&)            = default;

  num& operator=(num const&) = default;

  num(num&& o)               : value(o.value)

  { o.value = -1; }

  num& operator=(num&& o)

  {

    if (this != &o)

      {

        value = o.value;

        o.value = -1;

      }

    return *this;

  }

};

struct num_hash

{

  size_t operator()(num const& a) const

  { return a.value; }

};

struct num_equal

{

  static bool _S_called_on_moved_instance;

  bool operator()(num const& a, num const& b) const

  {

    if (a.value == -1 || b.value == -1)

      _S_called_on_moved_instance = true;

    return a.value == b.value;

  }

};

bool num_equal::_S_called_on_moved_instance = false;

// libstdc++/51866

void test01()

{

  bool test __attribute__((unused)) = true;

  std::unordered_multimap<num, int, num_hash, num_equal> mmap;

  mmap.insert(std::make_pair(num(1), 1));

  mmap.insert(std::make_pair(num(2), 2));

  mmap.insert(std::make_pair(num(1), 3));

  mmap.insert(std::make_pair(num(2), 4));

  VERIFY( mmap.size() == 4 );

  auto iter = mmap.cbegin();

  auto x0 = (iter++)->first.value;

  auto x1 = (iter++)->first.value;

  auto x2 = (iter++)->first.value;

  auto x3 = (iter++)->first.value;

  VERIFY( iter == mmap.cend() );

  VERIFY( (x0 == 1 && x1 == 1 && x2 == 2 && x3 == 2)

          || (x0 == 2 && x1 == 2 && x2 == 1 && x3 == 1) );

  VERIFY( !num_equal::_S_called_on_moved_instance );

}

int main()

{

  test01();

  return 0;

}