boost_unordered/test/unordered/load_factor_tests.cpp

// Copyright 2006-2009 Daniel James.
// Distributed under the Boost Software License, Version 1.0. (See accompanying
// file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)

#include "../helpers/prefix.hpp"
#include <boost/unordered_set.hpp>
#include <boost/unordered_map.hpp>
#include "../helpers/postfix.hpp"

#include "../helpers/test.hpp"
#include <boost/limits.hpp>
#include "../helpers/random_values.hpp"

#if defined(BOOST_MSVC)
#pragma warning(push)
#pragma warning(disable:4127) // conditional expression is constant
#endif

namespace load_factor_tests
{

test::seed_t initialize_seed(783656);

template <class X>
void set_load_factor_tests(X*)
{
    X x;

    BOOST_TEST(x.max_load_factor() == 1.0);
    BOOST_TEST(x.load_factor() == 0);

    // A valid implementation could fail these tests, but I think they're
    // reasonable.
    x.max_load_factor(2.0); BOOST_TEST(x.max_load_factor() == 2.0);
    x.max_load_factor(0.5); BOOST_TEST(x.max_load_factor() == 0.5);
}

template <class X>
void insert_test(X*, float mlf, test::random_generator generator)
{
    X x;
    x.max_load_factor(mlf);
    float b = x.max_load_factor();

    test::random_values<X> values(1000, generator);

    for(BOOST_DEDUCED_TYPENAME test::random_values<X>::const_iterator
            it = values.begin(), end = values.end(); it != end; ++it)
    {
        BOOST_DEDUCED_TYPENAME X::size_type old_size = x.size(),
                 old_bucket_count = x.bucket_count();
        x.insert(*it);
        if(static_cast<double>(old_size + 1) < b * static_cast<double>(old_bucket_count))
            BOOST_TEST(x.bucket_count() == old_bucket_count);
    }
}

template <class X>
void load_factor_insert_tests(X* ptr, test::random_generator generator)
{
    insert_test(ptr, 1.0f, generator);
    insert_test(ptr, 0.1f, generator);
    insert_test(ptr, 100.0f, generator);

    insert_test(ptr, (std::numeric_limits<float>::min)(),
        generator);

    if(std::numeric_limits<float>::has_infinity)
        insert_test(ptr, std::numeric_limits<float>::infinity(),
            generator);
}

boost::unordered_set<int>* int_set_ptr;
boost::unordered_multiset<int>* int_multiset_ptr;
boost::unordered_map<int, int>* int_map_ptr;
boost::unordered_multimap<int, int>* int_multimap_ptr;

using test::default_generator;
using test::generate_collisions;

UNORDERED_TEST(set_load_factor_tests,
    ((int_set_ptr)(int_multiset_ptr)(int_map_ptr)(int_multimap_ptr))
)

UNORDERED_TEST(load_factor_insert_tests,
    ((int_set_ptr)(int_multiset_ptr)(int_map_ptr)(int_multimap_ptr))
    ((default_generator)(generate_collisions))
)

}

RUN_TESTS()

#if defined(BOOST_MSVC)
#pragma warning(pop)
#pragma warning(disable:4127) // conditional expression is constant
#endif