boost_unordered/test/helpers/equivalent.hpp

// Copyright 2005-2009 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)

#if !defined(BOOST_UNORDERED_TESTS_EQUIVALENT_HEADER)
#define BOOST_UNORDERED_TESTS_EQUIVALENT_HEADER

#include "./fwd.hpp"
#include "./list.hpp"
#include "./metafunctions.hpp"
#include <algorithm>
#include <boost/detail/lightweight_test.hpp>
#include <boost/unordered_map.hpp>
#include <boost/unordered_set.hpp>

namespace test {
template <class T1, class T2>
bool equivalent_impl(T1 const& x, T2 const& y, base_type)
{
    return x == y;
}

template <class T>
bool equivalent_impl(boost::hash<T> const&, boost::hash<T> const&, derived_type)
{
    return true;
}

template <class T>
bool equivalent_impl(
    std::equal_to<T> const&, std::equal_to<T> const&, derived_type)
{
    return true;
}

template <class T1, class T2, class T3, class T4>
bool equivalent_impl(
    std::pair<T1, T2> const& x1, std::pair<T3, T4> const& x2, derived_type)
{
    return equivalent_impl(x1.first, x2.first, derived) &&
           equivalent_impl(x1.second, x2.second, derived);
}

struct equivalent_type
{
    equivalent_type() {}

    template <class T1, class T2>
    bool operator()(T1 const& x, T2 const& y) const
    {
        return equivalent_impl(x, y, derived);
    }
};

const equivalent_type equivalent;

template <class Container> class unordered_equivalence_tester
{
    BOOST_DEDUCED_TYPENAME Container::size_type size_;
    BOOST_DEDUCED_TYPENAME Container::hasher hasher_;
    BOOST_DEDUCED_TYPENAME Container::key_equal key_equal_;
    float max_load_factor_;

    typedef test::list<BOOST_DEDUCED_TYPENAME Container::value_type> value_list;
    value_list values_;

  public:
    unordered_equivalence_tester(Container const& x)
        : size_(x.size()), hasher_(x.hash_function()), key_equal_(x.key_eq()),
          max_load_factor_(x.max_load_factor()), values_(x.begin(), x.end())
    {
        values_.sort();
    }

    bool operator()(Container const& x) const
    {
        if (!((size_ == x.size()) &&
                (test::equivalent(hasher_, x.hash_function())) &&
                (test::equivalent(key_equal_, x.key_eq())) &&
                (max_load_factor_ == x.max_load_factor()) &&
                (values_.size() == x.size())))
            return false;

        value_list copy(x.begin(), x.end());
        copy.sort();
        return values_ == copy;
    }

  private:
    unordered_equivalence_tester();
};
}

#endif