test/std/containers/unord/unord.multimap/unord.multimap.swap/swap_non_member.pass.cpp

//===----------------------------------------------------------------------===//
//
// 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 = hash<Key>, class Pred = equal_to<Key>,
//           class Alloc = allocator<pair<const Key, T>>>
// class unordered_multimap

// void swap(unordered_multimap& __u);

#include <unordered_map>
#include <string>
#include <set>
#include <cassert>
#include <cstddef>

#include "test_macros.h"
#include "../../../check_consecutive.h"
#include "../../../test_compare.h"
#include "../../../test_hash.h"
#include "test_allocator.h"
#include "min_allocator.h"

int main(int, char**)
{
    {
        typedef test_hash<std::hash<int> > Hash;
        typedef test_compare<std::equal_to<int> > Compare;
        typedef test_allocator<std::pair<const int, std::string> > Alloc;
        typedef std::unordered_multimap<int, std::string, Hash, Compare, Alloc> C;
        C c1(0, Hash(1), Compare(1), Alloc(1, 1));
        C c2(0, Hash(2), Compare(2), Alloc(1, 2));
        c2.max_load_factor(2);
        swap(c1, c2);

        LIBCPP_ASSERT(c1.bucket_count() == 0);
        assert(c1.size() == 0);
        assert(c1.hash_function() == Hash(2));
        assert(c1.key_eq() == Compare(2));
        assert(c1.get_allocator().get_id() == 1);
        assert(static_cast<std::size_t>(std::distance(c1.begin(), c1.end())) == c1.size());
        assert(static_cast<std::size_t>(std::distance(c1.cbegin(), c1.cend())) == c1.size());
        assert(c1.max_load_factor() == 2);

        LIBCPP_ASSERT(c2.bucket_count() == 0);
        assert(c2.size() == 0);
        assert(c2.hash_function() == Hash(1));
        assert(c2.key_eq() == Compare(1));
        assert(c2.get_allocator().get_id() == 2);
        assert(static_cast<std::size_t>(std::distance(c2.begin(), c2.end())) == c2.size());
        assert(static_cast<std::size_t>(std::distance(c2.cbegin(), c2.cend())) == c2.size());
        assert(c2.max_load_factor() == 1);
    }
    {
        typedef test_hash<std::hash<int> > Hash;
        typedef test_compare<std::equal_to<int> > Compare;
        typedef test_allocator<std::pair<const int, std::string> > Alloc;
        typedef std::unordered_multimap<int, std::string, Hash, Compare, Alloc> C;
        typedef std::pair<int, std::string> P;
        P a2[] =
        {
            P(10, "ten"),
            P(20, "twenty"),
            P(30, "thirty"),
            P(40, "forty"),
            P(50, "fifty"),
            P(60, "sixty"),
            P(70, "seventy"),
            P(80, "eighty"),
        };
        C c1(0, Hash(1), Compare(1), Alloc(1, 1));
        C c2(std::begin(a2), std::end(a2), 0, Hash(2), Compare(2), Alloc(1, 2));
        c2.max_load_factor(2);
        swap(c1, c2);

        assert(c1.bucket_count() >= 8);
        assert(c1.size() == 8);
        assert(c1.find(10)->second == "ten");
        assert(c1.find(20)->second == "twenty");
        assert(c1.find(30)->second == "thirty");
        assert(c1.find(40)->second == "forty");
        assert(c1.find(50)->second == "fifty");
        assert(c1.find(60)->second == "sixty");
        assert(c1.find(70)->second == "seventy");
        assert(c1.find(80)->second == "eighty");
        assert(c1.hash_function() == Hash(2));
        assert(c1.key_eq() == Compare(2));
        assert(c1.get_allocator().get_id() == 1);
        assert(static_cast<std::size_t>(std::distance(c1.begin(), c1.end())) == c1.size());
        assert(static_cast<std::size_t>(std::distance(c1.cbegin(), c1.cend())) == c1.size());
        assert(c1.max_load_factor() == 2);

        LIBCPP_ASSERT(c2.bucket_count() == 0);
        assert(c2.size() == 0);
        assert(c2.hash_function() == Hash(1));
        assert(c2.key_eq() == Compare(1));
        assert(c2.get_allocator().get_id() == 2);
        assert(static_cast<std::size_t>(std::distance(c2.begin(), c2.end())) == c2.size());
        assert(static_cast<std::size_t>(std::distance(c2.cbegin(), c2.cend())) == c2.size());
        assert(c2.max_load_factor() == 1);
    }
    {
        typedef test_hash<std::hash<int> > Hash;
        typedef test_compare<std::equal_to<int> > Compare;
        typedef test_allocator<std::pair<const int, std::string> > Alloc;
        typedef std::unordered_multimap<int, std::string, Hash, Compare, Alloc> C;
        typedef std::pair<int, std::string> P;
        P a1[] =
        {
            P(1, "one"),
            P(2, "two"),
            P(3, "three"),
            P(4, "four"),
            P(1, "four"),
            P(2, "four"),
        };
        C c1(std::begin(a1), std::end(a1), 0, Hash(1), Compare(1), Alloc(1, 1));
        C c2(0, Hash(2), Compare(2), Alloc(1, 2));
        c2.max_load_factor(2);
        swap(c1, c2);

        LIBCPP_ASSERT(c1.bucket_count() == 0);
        assert(c1.size() == 0);
        assert(c1.hash_function() == Hash(2));
        assert(c1.key_eq() == Compare(2));
        assert(c1.get_allocator().get_id() == 1);
        assert(static_cast<std::size_t>(std::distance(c1.begin(), c1.end())) == c1.size());
        assert(static_cast<std::size_t>(std::distance(c1.cbegin(), c1.cend())) == c1.size());
        assert(c1.max_load_factor() == 2);

        assert(c2.bucket_count() >= 6);
        assert(c2.size() == 6);
        std::multiset<std::string> s;
        s.insert("one");
        s.insert("four");
        CheckConsecutiveKeys<C::const_iterator>(c2.find(1), c2.end(), 1, s);
        s.insert("two");
        s.insert("four");
        CheckConsecutiveKeys<C::const_iterator>(c2.find(2), c2.end(), 2, s);
        assert(c2.find(3)->second == "three");
        assert(c2.find(4)->second == "four");
        assert(c2.hash_function() == Hash(1));
        assert(c2.key_eq() == Compare(1));
        assert(c2.get_allocator().get_id() == 2);
        assert(static_cast<std::size_t>(std::distance(c2.begin(), c2.end())) == c2.size());
        assert(static_cast<std::size_t>(std::distance(c2.cbegin(), c2.cend())) == c2.size());
        assert(c2.max_load_factor() == 1);
    }
    {
        typedef test_hash<std::hash<int> > Hash;
        typedef test_compare<std::equal_to<int> > Compare;
        typedef test_allocator<std::pair<const int, std::string> > Alloc;
        typedef std::unordered_multimap<int, std::string, Hash, Compare, Alloc> C;
        typedef std::pair<int, std::string> P;
        P a1[] =
        {
            P(1, "one"),
            P(2, "two"),
            P(3, "three"),
            P(4, "four"),
            P(1, "four"),
            P(2, "four"),
        };
        P a2[] =
        {
            P(10, "ten"),
            P(20, "twenty"),
            P(30, "thirty"),
            P(40, "forty"),
            P(50, "fifty"),
            P(60, "sixty"),
            P(70, "seventy"),
            P(80, "eighty"),
        };
        C c1(std::begin(a1), std::end(a1), 0, Hash(1), Compare(1), Alloc(1, 1));
        C c2(std::begin(a2), std::end(a2), 0, Hash(2), Compare(2), Alloc(1, 2));
        c2.max_load_factor(2);
        swap(c1, c2);

        assert(c1.bucket_count() >= 8);
        assert(c1.size() == 8);
        assert(c1.find(10)->second == "ten");
        assert(c1.find(20)->second == "twenty");
        assert(c1.find(30)->second == "thirty");
        assert(c1.find(40)->second == "forty");
        assert(c1.find(50)->second == "fifty");
        assert(c1.find(60)->second == "sixty");
        assert(c1.find(70)->second == "seventy");
        assert(c1.find(80)->second == "eighty");
        assert(c1.hash_function() == Hash(2));
        assert(c1.key_eq() == Compare(2));
        assert(c1.get_allocator().get_id() == 1);
        assert(static_cast<std::size_t>(std::distance(c1.begin(), c1.end())) == c1.size());
        assert(static_cast<std::size_t>(std::distance(c1.cbegin(), c1.cend())) == c1.size());
        assert(c1.max_load_factor() == 2);

        assert(c2.bucket_count() >= 6);
        assert(c2.size() == 6);
        std::multiset<std::string> s;
        s.insert("one");
        s.insert("four");
        CheckConsecutiveKeys<C::const_iterator>(c2.find(1), c2.end(), 1, s);
        s.insert("two");
        s.insert("four");
        CheckConsecutiveKeys<C::const_iterator>(c2.find(2), c2.end(), 2, s);
        assert(c2.find(3)->second == "three");
        assert(c2.find(4)->second == "four");
        assert(c2.hash_function() == Hash(1));
        assert(c2.key_eq() == Compare(1));
        assert(c2.get_allocator().get_id() == 2);
        assert(static_cast<std::size_t>(std::distance(c2.begin(), c2.end())) == c2.size());
        assert(static_cast<std::size_t>(std::distance(c2.cbegin(), c2.cend())) == c2.size());
        assert(c2.max_load_factor() == 1);
    }

    {
        typedef test_hash<std::hash<int> > Hash;
        typedef test_compare<std::equal_to<int> > Compare;
        typedef other_allocator<std::pair<const int, std::string> > Alloc;
        typedef std::unordered_multimap<int, std::string, Hash, Compare, Alloc> C;
        C c1(0, Hash(1), Compare(1), Alloc(1));
        C c2(0, Hash(2), Compare(2), Alloc(2));
        c2.max_load_factor(2);
        swap(c1, c2);

        LIBCPP_ASSERT(c1.bucket_count() == 0);
        assert(c1.size() == 0);
        assert(c1.hash_function() == Hash(2));
        assert(c1.key_eq() == Compare(2));
        assert(c1.get_allocator() == Alloc(2));
        assert(static_cast<std::size_t>(std::distance(c1.begin(), c1.end())) == c1.size());
        assert(static_cast<std::size_t>(std::distance(c1.cbegin(), c1.cend())) == c1.size());
        assert(c1.max_load_factor() == 2);

        LIBCPP_ASSERT(c2.bucket_count() == 0);
        assert(c2.size() == 0);
        assert(c2.hash_function() == Hash(1));
        assert(c2.key_eq() == Compare(1));
        assert(c2.get_allocator() == Alloc(1));
        assert(static_cast<std::size_t>(std::distance(c2.begin(), c2.end())) == c2.size());
        assert(static_cast<std::size_t>(std::distance(c2.cbegin(), c2.cend())) == c2.size());
        assert(c2.max_load_factor() == 1);
    }
    {
        typedef test_hash<std::hash<int> > Hash;
        typedef test_compare<std::equal_to<int> > Compare;
        typedef other_allocator<std::pair<const int, std::string> > Alloc;
        typedef std::unordered_multimap<int, std::string, Hash, Compare, Alloc> C;
        typedef std::pair<int, std::string> P;
        P a2[] =
        {
            P(10, "ten"),
            P(20, "twenty"),
            P(30, "thirty"),
            P(40, "forty"),
            P(50, "fifty"),
            P(60, "sixty"),
            P(70, "seventy"),
            P(80, "eighty"),
        };
        C c1(0, Hash(1), Compare(1), Alloc(1));
        C c2(std::begin(a2), std::end(a2), 0, Hash(2), Compare(2), Alloc(2));
        c2.max_load_factor(2);
        swap(c1, c2);

        assert(c1.bucket_count() >= 8);
        assert(c1.size() == 8);
        assert(c1.find(10)->second == "ten");
        assert(c1.find(20)->second == "twenty");
        assert(c1.find(30)->second == "thirty");
        assert(c1.find(40)->second == "forty");
        assert(c1.find(50)->second == "fifty");
        assert(c1.find(60)->second == "sixty");
        assert(c1.find(70)->second == "seventy");
        assert(c1.find(80)->second == "eighty");
        assert(c1.hash_function() == Hash(2));
        assert(c1.key_eq() == Compare(2));
        assert(c1.get_allocator() == Alloc(2));
        assert(static_cast<std::size_t>(std::distance(c1.begin(), c1.end())) == c1.size());
        assert(static_cast<std::size_t>(std::distance(c1.cbegin(), c1.cend())) == c1.size());
        assert(c1.max_load_factor() == 2);

        LIBCPP_ASSERT(c2.bucket_count() == 0);
        assert(c2.size() == 0);
        assert(c2.hash_function() == Hash(1));
        assert(c2.key_eq() == Compare(1));
        assert(c2.get_allocator() == Alloc(1));
        assert(static_cast<std::size_t>(std::distance(c2.begin(), c2.end())) == c2.size());
        assert(static_cast<std::size_t>(std::distance(c2.cbegin(), c2.cend())) == c2.size());
        assert(c2.max_load_factor() == 1);
    }
    {
        typedef test_hash<std::hash<int> > Hash;
        typedef test_compare<std::equal_to<int> > Compare;
        typedef other_allocator<std::pair<const int, std::string> > Alloc;
        typedef std::unordered_multimap<int, std::string, Hash, Compare, Alloc> C;
        typedef std::pair<int, std::string> P;
        P a1[] =
        {
            P(1, "one"),
            P(2, "two"),
            P(3, "three"),
            P(4, "four"),
            P(1, "four"),
            P(2, "four"),
        };
        C c1(std::begin(a1), std::end(a1), 0, Hash(1), Compare(1), Alloc(1));
        C c2(0, Hash(2), Compare(2), Alloc(2));
        c2.max_load_factor(2);
        swap(c1, c2);

        LIBCPP_ASSERT(c1.bucket_count() == 0);
        assert(c1.size() == 0);
        assert(c1.hash_function() == Hash(2));
        assert(c1.key_eq() == Compare(2));
        assert(c1.get_allocator() == Alloc(2));
        assert(static_cast<std::size_t>(std::distance(c1.begin(), c1.end())) == c1.size());
        assert(static_cast<std::size_t>(std::distance(c1.cbegin(), c1.cend())) == c1.size());
        assert(c1.max_load_factor() == 2);

        assert(c2.bucket_count() >= 6);
        assert(c2.size() == 6);
        std::multiset<std::string> s;
        s.insert("one");
        s.insert("four");
        CheckConsecutiveKeys<C::const_iterator>(c2.find(1), c2.end(), 1, s);
        s.insert("two");
        s.insert("four");
        CheckConsecutiveKeys<C::const_iterator>(c2.find(2), c2.end(), 2, s);
        assert(c2.find(3)->second == "three");
        assert(c2.find(4)->second == "four");
        assert(c2.hash_function() == Hash(1));
        assert(c2.key_eq() == Compare(1));
        assert(c2.get_allocator() == Alloc(1));
        assert(static_cast<std::size_t>(std::distance(c2.begin(), c2.end())) == c2.size());
        assert(static_cast<std::size_t>(std::distance(c2.cbegin(), c2.cend())) == c2.size());
        assert(c2.max_load_factor() == 1);
    }
    {
        typedef test_hash<std::hash<int> > Hash;
        typedef test_compare<std::equal_to<int> > Compare;
        typedef other_allocator<std::pair<const int, std::string> > Alloc;
        typedef std::unordered_multimap<int, std::string, Hash, Compare, Alloc> C;
        typedef std::pair<int, std::string> P;
        P a1[] =
        {
            P(1, "one"),
            P(2, "two"),
            P(3, "three"),
            P(4, "four"),
            P(1, "four"),
            P(2, "four"),
        };
        P a2[] =
        {
            P(10, "ten"),
            P(20, "twenty"),
            P(30, "thirty"),
            P(40, "forty"),
            P(50, "fifty"),
            P(60, "sixty"),
            P(70, "seventy"),
            P(80, "eighty"),
        };
        C c1(std::begin(a1), std::end(a1), 0, Hash(1), Compare(1), Alloc(1));
        C c2(std::begin(a2), std::end(a2), 0, Hash(2), Compare(2), Alloc(2));
        c2.max_load_factor(2);
        swap(c1, c2);

        assert(c1.bucket_count() >= 8);
        assert(c1.size() == 8);
        assert(c1.find(10)->second == "ten");
        assert(c1.find(20)->second == "twenty");
        assert(c1.find(30)->second == "thirty");
        assert(c1.find(40)->second == "forty");
        assert(c1.find(50)->second == "fifty");
        assert(c1.find(60)->second == "sixty");
        assert(c1.find(70)->second == "seventy");
        assert(c1.find(80)->second == "eighty");
        assert(c1.hash_function() == Hash(2));
        assert(c1.key_eq() == Compare(2));
        assert(c1.get_allocator() == Alloc(2));
        assert(static_cast<std::size_t>(std::distance(c1.begin(), c1.end())) == c1.size());
        assert(static_cast<std::size_t>(std::distance(c1.cbegin(), c1.cend())) == c1.size());
        assert(c1.max_load_factor() == 2);

        assert(c2.bucket_count() >= 6);
        assert(c2.size() == 6);
        std::multiset<std::string> s;
        s.insert("one");
        s.insert("four");
        CheckConsecutiveKeys<C::const_iterator>(c2.find(1), c2.end(), 1, s);
        s.insert("two");
        s.insert("four");
        CheckConsecutiveKeys<C::const_iterator>(c2.find(2), c2.end(), 2, s);
        assert(c2.find(3)->second == "three");
        assert(c2.find(4)->second == "four");
        assert(c2.hash_function() == Hash(1));
        assert(c2.key_eq() == Compare(1));
        assert(c2.get_allocator() == Alloc(1));
        assert(static_cast<std::size_t>(std::distance(c2.begin(), c2.end())) == c2.size());
        assert(static_cast<std::size_t>(std::distance(c2.cbegin(), c2.cend())) == c2.size());
        assert(c2.max_load_factor() == 1);
    }
#if TEST_STD_VER >= 11
    {
        typedef test_hash<std::hash<int> > Hash;
        typedef test_compare<std::equal_to<int> > Compare;
        typedef min_allocator<std::pair<const int, std::string> > Alloc;
        typedef std::unordered_multimap<int, std::string, Hash, Compare, Alloc> C;
        C c1(0, Hash(1), Compare(1), Alloc());
        C c2(0, Hash(2), Compare(2), Alloc());
        c2.max_load_factor(2);
        swap(c1, c2);

        LIBCPP_ASSERT(c1.bucket_count() == 0);
        assert(c1.size() == 0);
        assert(c1.hash_function() == Hash(2));
        assert(c1.key_eq() == Compare(2));
        assert(c1.get_allocator() == Alloc());
        assert(static_cast<std::size_t>(std::distance(c1.begin(), c1.end())) == c1.size());
        assert(static_cast<std::size_t>(std::distance(c1.cbegin(), c1.cend())) == c1.size());
        assert(c1.max_load_factor() == 2);

        LIBCPP_ASSERT(c2.bucket_count() == 0);
        assert(c2.size() == 0);
        assert(c2.hash_function() == Hash(1));
        assert(c2.key_eq() == Compare(1));
        assert(c2.get_allocator() == Alloc());
        assert(static_cast<std::size_t>(std::distance(c2.begin(), c2.end())) == c2.size());
        assert(static_cast<std::size_t>(std::distance(c2.cbegin(), c2.cend())) == c2.size());
        assert(c2.max_load_factor() == 1);
    }
    {
        typedef test_hash<std::hash<int> > Hash;
        typedef test_compare<std::equal_to<int> > Compare;
        typedef min_allocator<std::pair<const int, std::string> > Alloc;
        typedef std::unordered_multimap<int, std::string, Hash, Compare, Alloc> C;
        typedef std::pair<int, std::string> P;
        P a2[] =
        {
            P(10, "ten"),
            P(20, "twenty"),
            P(30, "thirty"),
            P(40, "forty"),
            P(50, "fifty"),
            P(60, "sixty"),
            P(70, "seventy"),
            P(80, "eighty"),
        };
        C c1(0, Hash(1), Compare(1), Alloc());
        C c2(std::begin(a2), std::end(a2), 0, Hash(2), Compare(2), Alloc());
        c2.max_load_factor(2);
        swap(c1, c2);

        assert(c1.bucket_count() >= 8);
        assert(c1.size() == 8);
        assert(c1.find(10)->second == "ten");
        assert(c1.find(20)->second == "twenty");
        assert(c1.find(30)->second == "thirty");
        assert(c1.find(40)->second == "forty");
        assert(c1.find(50)->second == "fifty");
        assert(c1.find(60)->second == "sixty");
        assert(c1.find(70)->second == "seventy");
        assert(c1.find(80)->second == "eighty");
        assert(c1.hash_function() == Hash(2));
        assert(c1.key_eq() == Compare(2));
        assert(c1.get_allocator() == Alloc());
        assert(static_cast<std::size_t>(std::distance(c1.begin(), c1.end())) == c1.size());
        assert(static_cast<std::size_t>(std::distance(c1.cbegin(), c1.cend())) == c1.size());
        assert(c1.max_load_factor() == 2);

        LIBCPP_ASSERT(c2.bucket_count() == 0);
        assert(c2.size() == 0);
        assert(c2.hash_function() == Hash(1));
        assert(c2.key_eq() == Compare(1));
        assert(c2.get_allocator() == Alloc());
        assert(static_cast<std::size_t>(std::distance(c2.begin(), c2.end())) == c2.size());
        assert(static_cast<std::size_t>(std::distance(c2.cbegin(), c2.cend())) == c2.size());
        assert(c2.max_load_factor() == 1);
    }
    {
        typedef test_hash<std::hash<int> > Hash;
        typedef test_compare<std::equal_to<int> > Compare;
        typedef min_allocator<std::pair<const int, std::string> > Alloc;
        typedef std::unordered_multimap<int, std::string, Hash, Compare, Alloc> C;
        typedef std::pair<int, std::string> P;
        P a1[] =
        {
            P(1, "one"),
            P(2, "two"),
            P(3, "three"),
            P(4, "four"),
            P(1, "four"),
            P(2, "four"),
        };
        C c1(std::begin(a1), std::end(a1), 0, Hash(1), Compare(1), Alloc());
        C c2(0, Hash(2), Compare(2), Alloc());
        c2.max_load_factor(2);
        swap(c1, c2);

        LIBCPP_ASSERT(c1.bucket_count() == 0);
        assert(c1.size() == 0);
        assert(c1.hash_function() == Hash(2));
        assert(c1.key_eq() == Compare(2));
        assert(c1.get_allocator() == Alloc());
        assert(static_cast<std::size_t>(std::distance(c1.begin(), c1.end())) == c1.size());
        assert(static_cast<std::size_t>(std::distance(c1.cbegin(), c1.cend())) == c1.size());
        assert(c1.max_load_factor() == 2);

        assert(c2.bucket_count() >= 6);
        assert(c2.size() == 6);
        std::multiset<std::string> s;
        s.insert("one");
        s.insert("four");
        CheckConsecutiveKeys<C::const_iterator>(c2.find(1), c2.end(), 1, s);
        s.insert("two");
        s.insert("four");
        CheckConsecutiveKeys<C::const_iterator>(c2.find(2), c2.end(), 2, s);
        assert(c2.find(3)->second == "three");
        assert(c2.find(4)->second == "four");
        assert(c2.hash_function() == Hash(1));
        assert(c2.key_eq() == Compare(1));
        assert(c2.get_allocator() == Alloc());
        assert(static_cast<std::size_t>(std::distance(c2.begin(), c2.end())) == c2.size());
        assert(static_cast<std::size_t>(std::distance(c2.cbegin(), c2.cend())) == c2.size());
        assert(c2.max_load_factor() == 1);
    }
    {
        typedef test_hash<std::hash<int> > Hash;
        typedef test_compare<std::equal_to<int> > Compare;
        typedef min_allocator<std::pair<const int, std::string> > Alloc;
        typedef std::unordered_multimap<int, std::string, Hash, Compare, Alloc> C;
        typedef std::pair<int, std::string> P;
        P a1[] =
        {
            P(1, "one"),
            P(2, "two"),
            P(3, "three"),
            P(4, "four"),
            P(1, "four"),
            P(2, "four"),
        };
        P a2[] =
        {
            P(10, "ten"),
            P(20, "twenty"),
            P(30, "thirty"),
            P(40, "forty"),
            P(50, "fifty"),
            P(60, "sixty"),
            P(70, "seventy"),
            P(80, "eighty"),
        };
        C c1(std::begin(a1), std::end(a1), 0, Hash(1), Compare(1), Alloc());
        C c2(std::begin(a2), std::end(a2), 0, Hash(2), Compare(2), Alloc());
        c2.max_load_factor(2);
        swap(c1, c2);

        assert(c1.bucket_count() >= 8);
        assert(c1.size() == 8);
        assert(c1.find(10)->second == "ten");
        assert(c1.find(20)->second == "twenty");
        assert(c1.find(30)->second == "thirty");
        assert(c1.find(40)->second == "forty");
        assert(c1.find(50)->second == "fifty");
        assert(c1.find(60)->second == "sixty");
        assert(c1.find(70)->second == "seventy");
        assert(c1.find(80)->second == "eighty");
        assert(c1.hash_function() == Hash(2));
        assert(c1.key_eq() == Compare(2));
        assert(c1.get_allocator() == Alloc());
        assert(static_cast<std::size_t>(std::distance(c1.begin(), c1.end())) == c1.size());
        assert(static_cast<std::size_t>(std::distance(c1.cbegin(), c1.cend())) == c1.size());
        assert(c1.max_load_factor() == 2);

        assert(c2.bucket_count() >= 6);
        assert(c2.size() == 6);
        std::multiset<std::string> s;
        s.insert("one");
        s.insert("four");
        CheckConsecutiveKeys<C::const_iterator>(c2.find(1), c2.end(), 1, s);
        s.insert("two");
        s.insert("four");
        CheckConsecutiveKeys<C::const_iterator>(c2.find(2), c2.end(), 2, s);
        assert(c2.find(3)->second == "three");
        assert(c2.find(4)->second == "four");
        assert(c2.hash_function() == Hash(1));
        assert(c2.key_eq() == Compare(1));
        assert(c2.get_allocator() == Alloc());
        assert(static_cast<std::size_t>(std::distance(c2.begin(), c2.end())) == c2.size());
        assert(static_cast<std::size_t>(std::distance(c2.cbegin(), c2.cend())) == c2.size());
        assert(c2.max_load_factor() == 1);
    }
#endif

  return 0;
}