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

// <unordered_map>

// template <class Key, class T, class Hash, class Pred, class Alloc>
// bool
// operator==(const unordered_multimap<Key, T, Hash, Pred, Alloc>& x,
//            const unordered_multimap<Key, T, Hash, Pred, Alloc>& y);
//
// template <class Key, class T, class Hash, class Pred, class Alloc>
// bool
// operator!=(const unordered_multimap<Key, T, Hash, Pred, Alloc>& x,
//            const unordered_multimap<Key, T, Hash, Pred, Alloc>& y);

#include <unordered_map>
#include <string>
#include <cassert>
#include <iterator>

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

#include "test_comparisons.h"

int main(int, char**) {
  {
    typedef std::unordered_multimap<int, std::string> C;
    typedef std::pair<int, std::string> P;
    P a[] = {
        P(10, "ten"),
        P(20, "twenty"),
        P(20, "twenty 2"),
        P(30, "thirty"),
        P(40, "forty"),
        P(50, "fifty"),
        P(50, "fifty 2"),
        P(50, "fifty 3"),
        P(60, "sixty"),
        P(70, "seventy"),
        P(80, "eighty"),
    };
    const C c1(std::begin(a), std::end(a));
    const C c2;
    assert(testEquality(c1, c2, false));
  }
  {
    typedef std::unordered_multimap<int, std::string> C;
    typedef std::pair<int, std::string> P;
    P a[] = {
        P(10, "ten"),
        P(20, "twenty"),
        P(20, "twenty 2"),
        P(30, "thirty"),
        P(40, "forty"),
        P(50, "fifty"),
        P(50, "fifty 2"),
        P(50, "fifty 3"),
        P(60, "sixty"),
        P(70, "seventy"),
        P(80, "eighty"),
    };
    const C c1(std::begin(a), std::end(a));
    const C c2 = c1;
    assert(testEquality(c1, c2, true));
  }
  {
    typedef std::unordered_multimap<int, std::string> C;
    typedef std::pair<int, std::string> P;
    P a[] = {
        P(10, "ten"),
        P(20, "twenty"),
        P(20, "twenty 2"),
        P(30, "thirty"),
        P(40, "forty"),
        P(50, "fifty"),
        P(50, "fifty 2"),
        P(50, "fifty 3"),
        P(60, "sixty"),
        P(70, "seventy"),
        P(80, "eighty"),
    };
    C c1(std::begin(a), std::end(a));
    C c2 = c1;
    c2.rehash(30);
    assert(testEquality(c1, c2, true));
    c2.insert(P(90, "ninety"));
    assert(testEquality(c1, c2, false));
    c1.insert(P(90, "ninety"));
    assert(testEquality(c1, c2, true));
  }
  {
    typedef std::unordered_multimap<int, std::string> C;
    typedef std::pair<int, std::string> P;
    P a[] = {
        P(10, "ten"),
        P(20, "twenty"),
        P(20, "twenty 2"),
        P(30, "thirty"),
        P(40, "forty"),
        P(50, "fifty"),
        P(50, "fifty 2"),
        P(50, "fifty 3"),
        P(60, "sixty"),
        P(70, "seventy"),
        P(80, "eighty"),
    };
    C c1(std::begin(a), std::end(a));
    C c2 = c1;
    assert(testEquality(c1, c2, true));
    c1.insert(P(70, "seventy 2"));
    c2.insert(P(80, "eighty 2"));
    assert(testEquality(c1, c2, false));
  }
#if TEST_STD_VER >= 11
  {
    typedef std::unordered_multimap<int,
                                    std::string,
                                    std::hash<int>,
                                    std::equal_to<int>,
                                    min_allocator<std::pair<const int, std::string>>>
        C;
    typedef std::pair<int, std::string> P;
    P a[] = {
        P(10, "ten"),
        P(20, "twenty"),
        P(20, "twenty 2"),
        P(30, "thirty"),
        P(40, "forty"),
        P(50, "fifty"),
        P(50, "fifty 2"),
        P(50, "fifty 3"),
        P(60, "sixty"),
        P(70, "seventy"),
        P(80, "eighty"),
    };
    const C c1(std::begin(a), std::end(a));
    const C c2;
    assert(testEquality(c1, c2, false));
  }
  {
    typedef std::unordered_multimap<int,
                                    std::string,
                                    std::hash<int>,
                                    std::equal_to<int>,
                                    min_allocator<std::pair<const int, std::string>>>
        C;
    typedef std::pair<int, std::string> P;
    P a[] = {
        P(10, "ten"),
        P(20, "twenty"),
        P(20, "twenty 2"),
        P(30, "thirty"),
        P(40, "forty"),
        P(50, "fifty"),
        P(50, "fifty 2"),
        P(50, "fifty 3"),
        P(60, "sixty"),
        P(70, "seventy"),
        P(80, "eighty"),
    };
    const C c1(std::begin(a), std::end(a));
    const C c2 = c1;
    assert(testEquality(c1, c2, true));
  }
  {
    typedef std::unordered_multimap<int,
                                    std::string,
                                    std::hash<int>,
                                    std::equal_to<int>,
                                    min_allocator<std::pair<const int, std::string>>>
        C;
    typedef std::pair<int, std::string> P;
    P a[] = {
        P(10, "ten"),
        P(20, "twenty"),
        P(20, "twenty 2"),
        P(30, "thirty"),
        P(40, "forty"),
        P(50, "fifty"),
        P(50, "fifty 2"),
        P(50, "fifty 3"),
        P(60, "sixty"),
        P(70, "seventy"),
        P(80, "eighty"),
    };
    C c1(std::begin(a), std::end(a));
    C c2 = c1;
    c2.rehash(30);
    assert(testEquality(c1, c2, true));
    c2.insert(P(90, "ninety"));
    assert(testEquality(c1, c2, false));
    c1.insert(P(90, "ninety"));
    assert(testEquality(c1, c2, true));
  }
  {
    typedef std::unordered_multimap<int,
                                    std::string,
                                    std::hash<int>,
                                    std::equal_to<int>,
                                    min_allocator<std::pair<const int, std::string>>>
        C;
    typedef std::pair<int, std::string> P;
    P a[] = {
        P(10, "ten"),
        P(20, "twenty"),
        P(20, "twenty 2"),
        P(30, "thirty"),
        P(40, "forty"),
        P(50, "fifty"),
        P(50, "fifty 2"),
        P(50, "fifty 3"),
        P(60, "sixty"),
        P(70, "seventy"),
        P(80, "eighty"),
    };
    C c1(std::begin(a), std::end(a));
    C c2 = c1;
    assert(testEquality(c1, c2, true));
    c1.insert(P(70, "seventy 2"));
    c2.insert(P(80, "eighty 2"));
    assert(testEquality(c1, c2, false));
  }
#endif

  // Make sure we take into account the number of times that a key repeats into equality.
  {
    typedef std::pair<int, char> P;
    P a[] = {P(1, 'a'), P(1, 'b'), P(1, 'd'), P(2, 'b')};
    P b[] = {P(1, 'a'), P(1, 'b'), P(1, 'b'), P(1, 'd'), P(2, 'b')};

    std::unordered_multimap<int, char> c1(std::begin(a), std::end(a));
    std::unordered_multimap<int, char> c2(std::begin(b), std::end(b));
    assert(testEquality(c1, c2, false));
  }

  // Make sure we incorporate the values into the equality of the maps.
  // If we were to compare only the keys (including how many time each key repeats),
  // the following test would fail cause only the values differ.
  {
    typedef std::pair<int, char> P;
    P a[] = {P(1, 'a'), P(1, 'b'), P(1, 'd'), P(2, 'b')};
    P b[] = {P(1, 'a'), P(1, 'b'), P(1, 'E'), P(2, 'b')};
    //                                   ^ different here

    std::unordered_multimap<int, char> c1(std::begin(a), std::end(a));
    std::unordered_multimap<int, char> c2(std::begin(b), std::end(b));
    assert(testEquality(c1, c2, false));
  }

  return 0;
}
