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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_BASE_TYPE_HPP
#define BOOST_MULTI_INDEX_DETAIL_BASE_TYPE_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/detail/workaround.hpp>
#include <boost/mpl/at.hpp>
#include <boost/mpl/apply.hpp>
#include <boost/mpl/size.hpp>
#include <boost/multi_index/detail/index_base.hpp>
#include <boost/multi_index/detail/is_index_list.hpp>
#include <boost/multi_index/detail/msvc_index_specifier.hpp>
#include <boost/static_assert.hpp>
namespace boost{
namespace multi_index{
namespace detail{
/* MPL machinery to construct a linear hierarchy of indices out of
* a index list.
*/
#if BOOST_WORKAROUND(BOOST_MSVC,<1310)
struct index_applier
{
template<typename IndexSpecifierMeta,typename SuperMeta>
struct apply:
msvc_index_specifier<IndexSpecifierMeta::type>::
template result_index_class<SuperMeta>
{
};
};
#else
struct index_applier
{
template<typename IndexSpecifierMeta,typename SuperMeta>
struct apply
{
typedef typename IndexSpecifierMeta::type index_specifier;
typedef typename index_specifier::
BOOST_NESTED_TEMPLATE index_class<SuperMeta>::type type;
};
};
#endif
template<int N,typename Value,typename IndexSpecifierList,typename Allocator>
struct nth_layer
{
BOOST_STATIC_CONSTANT(int,length=mpl::size<IndexSpecifierList>::value);
typedef typename mpl::eval_if_c<
N==length,
mpl::identity<index_base<Value,IndexSpecifierList,Allocator> >,
mpl::apply2<
index_applier,
mpl::at_c<IndexSpecifierList,N>,
nth_layer<N+1,Value,IndexSpecifierList,Allocator>
>
>::type type;
};
template<typename Value,typename IndexSpecifierList,typename Allocator>
struct multi_index_base_type:nth_layer<0,Value,IndexSpecifierList,Allocator>
{
BOOST_STATIC_ASSERT(detail::is_index_list<IndexSpecifierList>::value);
};
} /* namespace multi_index::detail */
} /* namespace multi_index */
} /* namespace boost */
#endif
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