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

// pair<iterator,iterator>             equal_range(const key_type& k);
// pair<const_iterator,const_iterator> equal_range(const key_type& k) const;

#include <set>
#include <cassert>

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

int main(int, char**)
{
    {
    typedef int V;
    typedef std::multiset<int> M;
    {
        typedef std::pair<M::iterator, M::iterator> R;
        V ar[] =
        {
            5,
            5,
            5,
            7,
            7,
            7,
            9,
            9,
            9
        };
        M m(ar, ar+sizeof(ar)/sizeof(ar[0]));
        R r = m.equal_range(4);
        assert(r.first  == next(m.begin(), 0));
        assert(r.second == next(m.begin(), 0));
        r = m.equal_range(5);
        assert(r.first  == next(m.begin(), 0));
        assert(r.second == next(m.begin(), 3));
        r = m.equal_range(6);
        assert(r.first  == next(m.begin(), 3));
        assert(r.second == next(m.begin(), 3));
        r = m.equal_range(7);
        assert(r.first  == next(m.begin(), 3));
        assert(r.second == next(m.begin(), 6));
        r = m.equal_range(8);
        assert(r.first  == next(m.begin(), 6));
        assert(r.second == next(m.begin(), 6));
        r = m.equal_range(9);
        assert(r.first  == next(m.begin(), 6));
        assert(r.second == next(m.begin(), 9));
        r = m.equal_range(10);
        assert(r.first  == next(m.begin(), 9));
        assert(r.second == next(m.begin(), 9));
    }
    {
        typedef std::pair<M::const_iterator, M::const_iterator> R;
        V ar[] =
        {
            5,
            5,
            5,
            7,
            7,
            7,
            9,
            9,
            9
        };
        const M m(ar, ar+sizeof(ar)/sizeof(ar[0]));
        R r = m.equal_range(4);
        assert(r.first  == next(m.begin(), 0));
        assert(r.second == next(m.begin(), 0));
        r = m.equal_range(5);
        assert(r.first  == next(m.begin(), 0));
        assert(r.second == next(m.begin(), 3));
        r = m.equal_range(6);
        assert(r.first  == next(m.begin(), 3));
        assert(r.second == next(m.begin(), 3));
        r = m.equal_range(7);
        assert(r.first  == next(m.begin(), 3));
        assert(r.second == next(m.begin(), 6));
        r = m.equal_range(8);
        assert(r.first  == next(m.begin(), 6));
        assert(r.second == next(m.begin(), 6));
        r = m.equal_range(9);
        assert(r.first  == next(m.begin(), 6));
        assert(r.second == next(m.begin(), 9));
        r = m.equal_range(10);
        assert(r.first  == next(m.begin(), 9));
        assert(r.second == next(m.begin(), 9));
    }
    }
#if TEST_STD_VER >= 11
    {
    typedef int V;
    typedef std::multiset<int, std::less<int>, min_allocator<int>> M;
    {
        typedef std::pair<M::iterator, M::iterator> R;
        V ar[] =
        {
            5,
            5,
            5,
            7,
            7,
            7,
            9,
            9,
            9
        };
        M m(ar, ar+sizeof(ar)/sizeof(ar[0]));
        R r = m.equal_range(4);
        assert(r.first  == next(m.begin(), 0));
        assert(r.second == next(m.begin(), 0));
        r = m.equal_range(5);
        assert(r.first  == next(m.begin(), 0));
        assert(r.second == next(m.begin(), 3));
        r = m.equal_range(6);
        assert(r.first  == next(m.begin(), 3));
        assert(r.second == next(m.begin(), 3));
        r = m.equal_range(7);
        assert(r.first  == next(m.begin(), 3));
        assert(r.second == next(m.begin(), 6));
        r = m.equal_range(8);
        assert(r.first  == next(m.begin(), 6));
        assert(r.second == next(m.begin(), 6));
        r = m.equal_range(9);
        assert(r.first  == next(m.begin(), 6));
        assert(r.second == next(m.begin(), 9));
        r = m.equal_range(10);
        assert(r.first  == next(m.begin(), 9));
        assert(r.second == next(m.begin(), 9));
    }
    {
        typedef std::pair<M::const_iterator, M::const_iterator> R;
        V ar[] =
        {
            5,
            5,
            5,
            7,
            7,
            7,
            9,
            9,
            9
        };
        const M m(ar, ar+sizeof(ar)/sizeof(ar[0]));
        R r = m.equal_range(4);
        assert(r.first  == next(m.begin(), 0));
        assert(r.second == next(m.begin(), 0));
        r = m.equal_range(5);
        assert(r.first  == next(m.begin(), 0));
        assert(r.second == next(m.begin(), 3));
        r = m.equal_range(6);
        assert(r.first  == next(m.begin(), 3));
        assert(r.second == next(m.begin(), 3));
        r = m.equal_range(7);
        assert(r.first  == next(m.begin(), 3));
        assert(r.second == next(m.begin(), 6));
        r = m.equal_range(8);
        assert(r.first  == next(m.begin(), 6));
        assert(r.second == next(m.begin(), 6));
        r = m.equal_range(9);
        assert(r.first  == next(m.begin(), 6));
        assert(r.second == next(m.begin(), 9));
        r = m.equal_range(10);
        assert(r.first  == next(m.begin(), 9));
        assert(r.second == next(m.begin(), 9));
    }
    }
#endif
#if TEST_STD_VER > 11
    {
    typedef int V;
    typedef std::multiset<V, std::less<>> M;
    typedef std::pair<M::iterator, M::iterator> R;
    V ar[] =
    {
        5,
        5,
        5,
        7,
        7,
        7,
        9,
        9,
        9
    };
    M m(ar, ar+sizeof(ar)/sizeof(ar[0]));
    R r = m.equal_range(4);
    assert(r.first  == next(m.begin(), 0));
    assert(r.second == next(m.begin(), 0));
    r = m.equal_range(5);
    assert(r.first  == next(m.begin(), 0));
    assert(r.second == next(m.begin(), 3));
    r = m.equal_range(6);
    assert(r.first  == next(m.begin(), 3));
    assert(r.second == next(m.begin(), 3));
    r = m.equal_range(7);
    assert(r.first  == next(m.begin(), 3));
    assert(r.second == next(m.begin(), 6));
    r = m.equal_range(8);
    assert(r.first  == next(m.begin(), 6));
    assert(r.second == next(m.begin(), 6));
    r = m.equal_range(9);
    assert(r.first  == next(m.begin(), 6));
    assert(r.second == next(m.begin(), 9));
    r = m.equal_range(10);
    assert(r.first  == next(m.begin(), 9));
    assert(r.second == next(m.begin(), 9));
    }

    {
    typedef PrivateConstructor V;
    typedef std::multiset<V, std::less<>> M;
    typedef std::pair<M::iterator, M::iterator> R;

    M m;
    m.insert ( V::make ( 5 ));
    m.insert ( V::make ( 5 ));
    m.insert ( V::make ( 5 ));
    m.insert ( V::make ( 7 ));
    m.insert ( V::make ( 7 ));
    m.insert ( V::make ( 7 ));
    m.insert ( V::make ( 9 ));
    m.insert ( V::make ( 9 ));
    m.insert ( V::make ( 9 ));

    R r = m.equal_range(4);
    assert(r.first  == next(m.begin(), 0));
    assert(r.second == next(m.begin(), 0));
    r = m.equal_range(5);
    assert(r.first  == next(m.begin(), 0));
    assert(r.second == next(m.begin(), 3));
    r = m.equal_range(6);
    assert(r.first  == next(m.begin(), 3));
    assert(r.second == next(m.begin(), 3));
    r = m.equal_range(7);
    assert(r.first  == next(m.begin(), 3));
    assert(r.second == next(m.begin(), 6));
    r = m.equal_range(8);
    assert(r.first  == next(m.begin(), 6));
    assert(r.second == next(m.begin(), 6));
    r = m.equal_range(9);
    assert(r.first  == next(m.begin(), 6));
    assert(r.second == next(m.begin(), 9));
    r = m.equal_range(10);
    assert(r.first  == next(m.begin(), 9));
    assert(r.second == next(m.begin(), 9));
    }
#endif

  return 0;
}
