//===----------------------------------------------------------------------===//
//
// 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
//
//===----------------------------------------------------------------------===//

// <set>

// class multiset

// iterator erase(const_iterator first, const_iterator last);

#include <set>
#include <cassert>

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

int main(int, char**) {
  {
    typedef std::multiset<int> M;
    typedef int V;
    typedef M::iterator I;
    V ar[] = {1, 2, 3, 4, 5, 6, 7, 8};
    M m(ar, ar + sizeof(ar) / sizeof(ar[0]));
    assert(m.size() == 8);
    I i = m.erase(std::next(m.cbegin(), 5), std::next(m.cbegin(), 5));
    assert(m.size() == 8);
    assert(i == std::next(m.begin(), 5));
    assert(*std::next(m.begin(), 0) == 1);
    assert(*std::next(m.begin(), 1) == 2);
    assert(*std::next(m.begin(), 2) == 3);
    assert(*std::next(m.begin(), 3) == 4);
    assert(*std::next(m.begin(), 4) == 5);
    assert(*std::next(m.begin(), 5) == 6);
    assert(*std::next(m.begin(), 6) == 7);
    assert(*std::next(m.begin(), 7) == 8);

    i = m.erase(std::next(m.cbegin(), 3), std::next(m.cbegin(), 4));
    assert(m.size() == 7);
    assert(i == std::next(m.begin(), 3));
    assert(*std::next(m.begin(), 0) == 1);
    assert(*std::next(m.begin(), 1) == 2);
    assert(*std::next(m.begin(), 2) == 3);
    assert(*std::next(m.begin(), 3) == 5);
    assert(*std::next(m.begin(), 4) == 6);
    assert(*std::next(m.begin(), 5) == 7);
    assert(*std::next(m.begin(), 6) == 8);

    i = m.erase(std::next(m.cbegin(), 2), std::next(m.cbegin(), 5));
    assert(m.size() == 4);
    assert(i == std::next(m.begin(), 2));
    assert(*std::next(m.begin(), 0) == 1);
    assert(*std::next(m.begin(), 1) == 2);
    assert(*std::next(m.begin(), 2) == 7);
    assert(*std::next(m.begin(), 3) == 8);

    i = m.erase(std::next(m.cbegin(), 0), std::next(m.cbegin(), 2));
    assert(m.size() == 2);
    assert(i == std::next(m.begin(), 0));
    assert(*std::next(m.begin(), 0) == 7);
    assert(*std::next(m.begin(), 1) == 8);

    i = m.erase(m.cbegin(), m.cend());
    assert(m.size() == 0);
    assert(i == m.end());
  }
#if TEST_STD_VER >= 11
  {
    typedef std::multiset<int, std::less<int>, min_allocator<int>> M;
    typedef int V;
    typedef M::iterator I;
    V ar[] = {1, 2, 3, 4, 5, 6, 7, 8};
    M m(ar, ar + sizeof(ar) / sizeof(ar[0]));
    assert(m.size() == 8);
    I i = m.erase(std::next(m.cbegin(), 5), std::next(m.cbegin(), 5));
    assert(m.size() == 8);
    assert(i == std::next(m.begin(), 5));
    assert(*std::next(m.begin(), 0) == 1);
    assert(*std::next(m.begin(), 1) == 2);
    assert(*std::next(m.begin(), 2) == 3);
    assert(*std::next(m.begin(), 3) == 4);
    assert(*std::next(m.begin(), 4) == 5);
    assert(*std::next(m.begin(), 5) == 6);
    assert(*std::next(m.begin(), 6) == 7);
    assert(*std::next(m.begin(), 7) == 8);

    i = m.erase(std::next(m.cbegin(), 3), std::next(m.cbegin(), 4));
    assert(m.size() == 7);
    assert(i == std::next(m.begin(), 3));
    assert(*std::next(m.begin(), 0) == 1);
    assert(*std::next(m.begin(), 1) == 2);
    assert(*std::next(m.begin(), 2) == 3);
    assert(*std::next(m.begin(), 3) == 5);
    assert(*std::next(m.begin(), 4) == 6);
    assert(*std::next(m.begin(), 5) == 7);
    assert(*std::next(m.begin(), 6) == 8);

    i = m.erase(std::next(m.cbegin(), 2), std::next(m.cbegin(), 5));
    assert(m.size() == 4);
    assert(i == std::next(m.begin(), 2));
    assert(*std::next(m.begin(), 0) == 1);
    assert(*std::next(m.begin(), 1) == 2);
    assert(*std::next(m.begin(), 2) == 7);
    assert(*std::next(m.begin(), 3) == 8);

    i = m.erase(std::next(m.cbegin(), 0), std::next(m.cbegin(), 2));
    assert(m.size() == 2);
    assert(i == std::next(m.begin(), 0));
    assert(*std::next(m.begin(), 0) == 7);
    assert(*std::next(m.begin(), 1) == 8);

    i = m.erase(m.cbegin(), m.cend());
    assert(m.size() == 0);
    assert(i == m.end());
  }
#endif

  return 0;
}
