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- /* Copyright 2003-2013 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)
- #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/static_assert.hpp>
- namespace boost{
- namespace multi_index{
- namespace detail{
- /* MPL machinery to construct a linear hierarchy of indices out of
- * a index list.
- */
- 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;
- };
- };
- 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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