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/* 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_ORD_INDEX_ARGS_HPP
#define BOOST_MULTI_INDEX_DETAIL_ORD_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/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{
/* Oredered index specifiers can be instantiated in two forms:
*
* (ordered_unique|ordered_non_unique)<
* KeyFromValue,Compare=std::less<KeyFromValue::result_type> >
* (ordered_unique|ordered_non_unique)<
* TagList,KeyFromValue,Compare=std::less<KeyFromValue::result_type> >
*
* index_args implements the machinery to accept this argument-dependent
* polymorphism.
*/
template<typename KeyFromValue>
struct index_args_default_compare
{
typedef std::less<typename KeyFromValue::result_type> type;
};
template<typename Arg1,typename Arg2,typename Arg3>
struct ordered_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_compare_type;
typedef typename mpl::eval_if<
mpl::is_na<supplied_compare_type>,
index_args_default_compare<key_from_value_type>,
mpl::identity<supplied_compare_type>
>::type compare_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<compare_type>::value);
};
} /* namespace multi_index::detail */
} /* namespace multi_index */
} /* namespace boost */
#endif
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