kicad/include/boost/multi_index/detail/hash_index_args.hpp

106 lines
3.0 KiB
C++

/* Copyright 2003-2008 Joaquin M Lopez Munoz.
* 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)
*
* See http://www.boost.org/libs/multi_index for library home page.
*/
#ifndef BOOST_MULTI_INDEX_DETAIL_HASH_INDEX_ARGS_HPP
#define BOOST_MULTI_INDEX_DETAIL_HASH_INDEX_ARGS_HPP
#if defined(_MSC_VER)&&(_MSC_VER>=1200)
#pragma once
#endif
#include <boost/config.hpp> /* keep it first to prevent nasty warns in MSVC */
#include <boost/functional/hash.hpp>
#include <boost/mpl/aux_/na.hpp>
#include <boost/mpl/eval_if.hpp>
#include <boost/mpl/identity.hpp>
#include <boost/mpl/if.hpp>
#include <boost/multi_index/tag.hpp>
#include <boost/static_assert.hpp>
#include <boost/type_traits/is_same.hpp>
#include <functional>
namespace boost{
namespace multi_index{
namespace detail{
/* Hashed index specifiers can be instantiated in two forms:
*
* (hashed_unique|hashed_non_unique)<
* KeyFromValue,
* Hash=boost::hash<KeyFromValue::result_type>,
* Pred=std::equal_to<KeyFromValue::result_type> >
* (hashed_unique|hashed_non_unique)<
* TagList,
* KeyFromValue,
* Hash=boost::hash<KeyFromValue::result_type>,
* Pred=std::equal_to<KeyFromValue::result_type> >
*
* hashed_index_args implements the machinery to accept this
* argument-dependent polymorphism.
*/
template<typename KeyFromValue>
struct index_args_default_hash
{
typedef ::boost::hash<typename KeyFromValue::result_type> type;
};
template<typename KeyFromValue>
struct index_args_default_pred
{
typedef std::equal_to<typename KeyFromValue::result_type> type;
};
template<typename Arg1,typename Arg2,typename Arg3,typename Arg4>
struct hashed_index_args
{
typedef is_tag<Arg1> full_form;
typedef typename mpl::if_<
full_form,
Arg1,
tag< > >::type tag_list_type;
typedef typename mpl::if_<
full_form,
Arg2,
Arg1>::type key_from_value_type;
typedef typename mpl::if_<
full_form,
Arg3,
Arg2>::type supplied_hash_type;
typedef typename mpl::eval_if<
mpl::is_na<supplied_hash_type>,
index_args_default_hash<key_from_value_type>,
mpl::identity<supplied_hash_type>
>::type hash_type;
typedef typename mpl::if_<
full_form,
Arg4,
Arg3>::type supplied_pred_type;
typedef typename mpl::eval_if<
mpl::is_na<supplied_pred_type>,
index_args_default_pred<key_from_value_type>,
mpl::identity<supplied_pred_type>
>::type pred_type;
BOOST_STATIC_ASSERT(is_tag<tag_list_type>::value);
BOOST_STATIC_ASSERT(!mpl::is_na<key_from_value_type>::value);
BOOST_STATIC_ASSERT(!mpl::is_na<hash_type>::value);
BOOST_STATIC_ASSERT(!mpl::is_na<pred_type>::value);
};
} /* namespace multi_index::detail */
} /* namespace multi_index */
} /* namespace boost */
#endif