boost_unordered/include/boost/unordered/detail/hash_table.hpp

// Copyright (C) 2003-2004 Jeremy B. Maitin-Shepard.
// Copyright (C) 2005-2007 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)

#ifndef BOOST_UNORDERED_DETAIL_HASH_TABLE_HPP_INCLUDED
#define BOOST_UNORDERED_DETAIL_HASH_TABLE_HPP_INCLUDED

#if defined(_MSC_VER) && (_MSC_VER >= 1020)
# pragma once
#endif

#include <boost/config.hpp>

#include <cstddef>
#include <cmath>
#include <algorithm>
#include <utility>
#include <stdexcept>

#include <boost/iterator.hpp>
#include <boost/iterator/iterator_categories.hpp>
#include <boost/limits.hpp>
#include <boost/assert.hpp>
#include <boost/static_assert.hpp>
#include <boost/unordered/detail/allocator.hpp>
#include <boost/type_traits/is_same.hpp>
#include <boost/mpl/if.hpp>
#include <boost/mpl/and.hpp>
#include <boost/detail/workaround.hpp>

#include <boost/mpl/aux_/config/eti.hpp>

#if BOOST_WORKAROUND(__BORLANDC__, <= 0x0551)
#define BOOST_HASH_BORLAND_BOOL(x) (bool)(x)
#else
#define BOOST_HASH_BORLAND_BOOL(x) x
#endif

#if BOOST_WORKAROUND(BOOST_MSVC, < 1300)
#define BOOST_HASH_MSVC_RESET_PTR(x) unordered_detail::reset(x)
#else
#define BOOST_HASH_MSVC_RESET_PTR(x)
#endif

namespace boost {
    namespace unordered_detail {
        template <class T> struct type_wrapper {};

        const static std::size_t default_initial_bucket_count = 50;
        const static float minimum_max_load_factor = 1e-3f;
        inline std::size_t next_prime(std::size_t n);

        template <class T>
        inline void hash_swap(T& x, T& y)
        {
#if defined(BOOST_NO_ARGUMENT_DEPENDENT_LOOKUP)
            std::swap(x,y);
#else
            using std::swap;
            swap(x, y);
#endif
        }

        inline std::size_t float_to_size_t(float f)
        {
            return f > static_cast<float>((std::numeric_limits<std::size_t>::max)()) ?
                (std::numeric_limits<std::size_t>::max)() :
                static_cast<std::size_t>(f);
        }

        // prime number list, accessor

        static const std::size_t prime_list[] = {
            53ul, 97ul, 193ul, 389ul, 769ul,
            1543ul, 3079ul, 6151ul, 12289ul, 24593ul,
            49157ul, 98317ul, 196613ul, 393241ul, 786433ul,
            1572869ul, 3145739ul, 6291469ul, 12582917ul, 25165843ul,
            50331653ul, 100663319ul, 201326611ul, 402653189ul, 805306457ul,
            1610612741ul, 3221225473ul, 4294967291ul };

        // no throw
        inline std::size_t next_prime(std::size_t n) {
            std::size_t const* const prime_list_end = prime_list +
                sizeof(prime_list) / sizeof(*prime_list);
            std::size_t const* bound =
                std::lower_bound(prime_list,prime_list_end, n);
            if(bound == prime_list_end)
                bound--;
            return *bound;
        }

        // no throw
        inline std::size_t prev_prime(std::size_t n) {
            std::size_t const* const prime_list_end = prime_list +
                sizeof(prime_list) / sizeof(*prime_list);
            std::size_t const* bound =
                std::upper_bound(prime_list,prime_list_end, n);
            if(bound != prime_list)
                bound--;
            return *bound;
        }

        // pair_cast - used to convert between pair types.

        template <class Dst1, class Dst2, class Src1, class Src2>
        inline std::pair<Dst1, Dst2> pair_cast(std::pair<Src1, Src2> const& x)
        {
            return std::pair<Dst1, Dst2>(Dst1(x.first), Dst2(x.second));
        }
    }
}

#define BOOST_UNORDERED_HASH_EQUIVALENT 1
#include <boost/unordered/detail/hash_table_impl.hpp>
#undef BOOST_UNORDERED_HASH_EQUIVALENT

#define BOOST_UNORDERED_HASH_EQUIVALENT 0
#include <boost/unordered/detail/hash_table_impl.hpp>
#undef BOOST_UNORDERED_HASH_EQUIVALENT

namespace boost {
    namespace unordered_detail {
        class iterator_access
        {
        public:
            template <class Iterator>
            static BOOST_DEDUCED_TYPENAME Iterator::base const& get(Iterator const& it) {
                return it.base_;
            }
        };

        template <class ValueType, class KeyType,
            class Hash, class Pred, class Alloc>
        class hash_types_unique_keys
        {
        public:
            typedef BOOST_DEDUCED_TYPENAME
                boost::unordered_detail::rebind_wrap<Alloc, ValueType>::type
                value_allocator;

            typedef hash_table_unique_keys<ValueType, KeyType, Hash, Pred,
                    value_allocator> hash_table;
            typedef hash_table_data_unique_keys<value_allocator> data;
            typedef BOOST_DEDUCED_TYPENAME data::iterator_base iterator_base;

            typedef hash_const_local_iterator_unique_keys<value_allocator> const_local_iterator;
            typedef hash_local_iterator_unique_keys<value_allocator> local_iterator;
            typedef hash_const_iterator_unique_keys<value_allocator> const_iterator;
            typedef hash_iterator_unique_keys<value_allocator> iterator;

            typedef BOOST_DEDUCED_TYPENAME data::size_type size_type;
            typedef std::ptrdiff_t difference_type;
        };

        template <class ValueType, class KeyType,
            class Hash, class Pred, class Alloc>
        class hash_types_equivalent_keys
        {
        public:
            typedef BOOST_DEDUCED_TYPENAME
                boost::unordered_detail::rebind_wrap<Alloc, ValueType>::type
                value_allocator;

            typedef hash_table_equivalent_keys<ValueType, KeyType, Hash, Pred,
                    value_allocator> hash_table;
            typedef hash_table_data_equivalent_keys<value_allocator> data;
            typedef BOOST_DEDUCED_TYPENAME data::iterator_base iterator_base;

            typedef hash_const_local_iterator_equivalent_keys<value_allocator> const_local_iterator;
            typedef hash_local_iterator_equivalent_keys<value_allocator> local_iterator;
            typedef hash_const_iterator_equivalent_keys<value_allocator> const_iterator;
            typedef hash_iterator_equivalent_keys<value_allocator> iterator;

            typedef BOOST_DEDUCED_TYPENAME data::size_type size_type;
            typedef std::ptrdiff_t difference_type;
        };
    } // namespace boost::unordered_detail
} // namespace boost

#undef BOOST_HASH_BORLAND_BOOL
#undef BOOST_HASH_MSVC_RESET_PTR

#endif // BOOST_UNORDERED_DETAIL_HASH_TABLE_HPP_INCLUDED