//===----------------------------------------------------------------------===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//

// <map>

// class multimap

//       iterator begin();
// const_iterator begin() const;
//       iterator end();
// const_iterator end()   const;
//
//       reverse_iterator rbegin();
// const_reverse_iterator rbegin() const;
//       reverse_iterator rend();
// const_reverse_iterator rend()   const;
//
// const_iterator         cbegin()  const;
// const_iterator         cend()    const;
// const_reverse_iterator crbegin() const;
// const_reverse_iterator crend()   const;

#include <map>
#include <cassert>
#include <cstddef>

#include "test_macros.h"
#include "min_allocator.h"

int main(int, char**) {
  {
    typedef std::pair<const int, double> V;
    V ar[] = {V(1, 1),   V(1, 1.5), V(1, 2),   V(2, 1),   V(2, 1.5), V(2, 2),   V(3, 1),   V(3, 1.5),
              V(3, 2),   V(4, 1),   V(4, 1.5), V(4, 2),   V(5, 1),   V(5, 1.5), V(5, 2),   V(6, 1),
              V(6, 1.5), V(6, 2),   V(7, 1),   V(7, 1.5), V(7, 2),   V(8, 1),   V(8, 1.5), V(8, 2)};
    std::multimap<int, double> m(ar, ar + sizeof(ar) / sizeof(ar[0]));
    assert(static_cast<std::size_t>(std::distance(m.begin(), m.end())) == m.size());
    assert(static_cast<std::size_t>(std::distance(m.rbegin(), m.rend())) == m.size());
    std::multimap<int, double>::iterator i;
    i                                            = m.begin();
    std::multimap<int, double>::const_iterator k = i;
    assert(i == k);
    for (int j = 1; j <= 8; ++j)
      for (double d = 1; d <= 2; d += .5, ++i) {
        assert(i->first == j);
        assert(i->second == d);
        i->second = 2.5;
        assert(i->second == 2.5);
      }
    assert(i == m.end());
    for (int j = 8; j >= 1; --j)
      for (double d = 1; d <= 2; d += .5) {
        --i;
        assert(i->first == j);
        assert(i->second == 2.5);
        i->second = d;
        assert(i->second == d);
      }
    assert(i == m.begin());
  }
  {
    typedef std::pair<const int, double> V;
    V ar[] = {V(1, 1),   V(1, 1.5), V(1, 2),   V(2, 1),   V(2, 1.5), V(2, 2),   V(3, 1),   V(3, 1.5),
              V(3, 2),   V(4, 1),   V(4, 1.5), V(4, 2),   V(5, 1),   V(5, 1.5), V(5, 2),   V(6, 1),
              V(6, 1.5), V(6, 2),   V(7, 1),   V(7, 1.5), V(7, 2),   V(8, 1),   V(8, 1.5), V(8, 2)};
    const std::multimap<int, double> m(ar, ar + sizeof(ar) / sizeof(ar[0]));
    assert(static_cast<std::size_t>(std::distance(m.begin(), m.end())) == m.size());
    assert(static_cast<std::size_t>(std::distance(m.cbegin(), m.cend())) == m.size());
    assert(static_cast<std::size_t>(std::distance(m.rbegin(), m.rend())) == m.size());
    assert(static_cast<std::size_t>(std::distance(m.crbegin(), m.crend())) == m.size());
    std::multimap<int, double>::const_iterator i;
    i = m.begin();
    for (int j = 1; j <= 8; ++j)
      for (double d = 1; d <= 2; d += .5, ++i) {
        assert(i->first == j);
        assert(i->second == d);
      }
    assert(i == m.end());
    for (int j = 8; j >= 1; --j)
      for (double d = 2; d >= 1; d -= .5) {
        --i;
        assert(i->first == j);
        assert(i->second == d);
      }
    assert(i == m.begin());
  }
#if TEST_STD_VER >= 11
  {
    typedef std::pair<const int, double> V;
    V ar[] = {V(1, 1),   V(1, 1.5), V(1, 2),   V(2, 1),   V(2, 1.5), V(2, 2),   V(3, 1),   V(3, 1.5),
              V(3, 2),   V(4, 1),   V(4, 1.5), V(4, 2),   V(5, 1),   V(5, 1.5), V(5, 2),   V(6, 1),
              V(6, 1.5), V(6, 2),   V(7, 1),   V(7, 1.5), V(7, 2),   V(8, 1),   V(8, 1.5), V(8, 2)};
    std::multimap<int, double, std::less<int>, min_allocator<V>> m(ar, ar + sizeof(ar) / sizeof(ar[0]));
    assert(static_cast<std::size_t>(std::distance(m.begin(), m.end())) == m.size());
    assert(static_cast<std::size_t>(std::distance(m.rbegin(), m.rend())) == m.size());
    std::multimap<int, double, std::less<int>, min_allocator<V>>::iterator i;
    i                                                                              = m.begin();
    std::multimap<int, double, std::less<int>, min_allocator<V>>::const_iterator k = i;
    assert(i == k);
    for (int j = 1; j <= 8; ++j)
      for (double d = 1; d <= 2; d += .5, ++i) {
        assert(i->first == j);
        assert(i->second == d);
        i->second = 2.5;
        assert(i->second == 2.5);
      }
    assert(i == m.end());
    for (int j = 8; j >= 1; --j)
      for (double d = 1; d <= 2; d += .5) {
        --i;
        assert(i->first == j);
        assert(i->second == 2.5);
        i->second = d;
        assert(i->second == d);
      }
    assert(i == m.begin());
  }
  {
    typedef std::pair<const int, double> V;
    V ar[] = {V(1, 1),   V(1, 1.5), V(1, 2),   V(2, 1),   V(2, 1.5), V(2, 2),   V(3, 1),   V(3, 1.5),
              V(3, 2),   V(4, 1),   V(4, 1.5), V(4, 2),   V(5, 1),   V(5, 1.5), V(5, 2),   V(6, 1),
              V(6, 1.5), V(6, 2),   V(7, 1),   V(7, 1.5), V(7, 2),   V(8, 1),   V(8, 1.5), V(8, 2)};
    const std::multimap<int, double, std::less<int>, min_allocator<V>> m(ar, ar + sizeof(ar) / sizeof(ar[0]));
    assert(static_cast<std::size_t>(std::distance(m.begin(), m.end())) == m.size());
    assert(static_cast<std::size_t>(std::distance(m.cbegin(), m.cend())) == m.size());
    assert(static_cast<std::size_t>(std::distance(m.rbegin(), m.rend())) == m.size());
    assert(static_cast<std::size_t>(std::distance(m.crbegin(), m.crend())) == m.size());
    std::multimap<int, double, std::less<int>, min_allocator<V>>::const_iterator i;
    i = m.begin();
    for (int j = 1; j <= 8; ++j)
      for (double d = 1; d <= 2; d += .5, ++i) {
        assert(i->first == j);
        assert(i->second == d);
      }
    assert(i == m.end());
    for (int j = 8; j >= 1; --j)
      for (double d = 2; d >= 1; d -= .5) {
        --i;
        assert(i->first == j);
        assert(i->second == d);
      }
    assert(i == m.begin());
  }
#endif
#if TEST_STD_VER > 11
  { // N3644 testing
    typedef std::multimap<int, double> C;
    C::iterator ii1{}, ii2{};
    C::iterator ii4 = ii1;
    C::const_iterator cii{};
    assert(ii1 == ii2);
    assert(ii1 == ii4);

    assert(!(ii1 != ii2));

    assert((ii1 == cii));
    assert((cii == ii1));
    assert(!(ii1 != cii));
    assert(!(cii != ii1));
  }
#endif

  return 0;
}
