test/std/containers/unord/unord.map/max_load_factor.pass.cpp

//===----------------------------------------------------------------------===//
//
//                     The LLVM Compiler Infrastructure
//
// This file is dual licensed under the MIT and the University of Illinois Open
// Source Licenses. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//

// <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_map

// float max_load_factor() const;
// void max_load_factor(float mlf);

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

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

int main()
{
    {
        typedef std::unordered_map<int, std::string> C;
        const C c;
        assert(c.max_load_factor() == 1);
    }
    {
        typedef std::unordered_map<int, std::string> C;
        C c;
        assert(c.max_load_factor() == 1);
        c.max_load_factor(2.5);
        assert(c.max_load_factor() == 2.5);
    }
#if TEST_STD_VER >= 11
    {
        typedef std::unordered_map<int, std::string, std::hash<int>, std::equal_to<int>,
                            min_allocator<std::pair<const int, std::string>>> C;
        const C c;
        assert(c.max_load_factor() == 1);
    }
    {
        typedef std::unordered_map<int, std::string, std::hash<int>, std::equal_to<int>,
                            min_allocator<std::pair<const int, std::string>>> C;
        C c;
        assert(c.max_load_factor() == 1);
        c.max_load_factor(2.5);
        assert(c.max_load_factor() == 2.5);
    }
#endif
#if _LIBCPP_DEBUG_LEVEL >= 1
    {
        typedef std::unordered_map<int, std::string> C;
        C c;
        c.max_load_factor(0);
        assert(false);
    }
#endif
}