/* Copyright 2003-2005 Joaquín M López Muñoz.

 * 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_INDEXED_BY_HPP

#define BOOST_MULTI_INDEX_INDEXED_BY_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/vector.hpp>

#include <boost/preprocessor/cat.hpp>

#include <boost/preprocessor/control/expr_if.hpp>

#include <boost/preprocessor/repetition/enum.hpp>

#include <boost/preprocessor/repetition/enum_params.hpp> 

/* An alias to mpl::vector used to hide MPL from the user.

 * indexed_by contains the index specifiers for instantiation

 * of a multi_index_container.

 */

/* This user_definable macro limits the number of elements of an index list;

 * useful for shortening resulting symbol names (MSVC++ 6.0, for instance,

 * has problems coping with very long symbol names.)

 */

#if !defined(BOOST_MULTI_INDEX_LIMIT_INDEXED_BY_SIZE)

#if defined(BOOST_MSVC)&&(BOOST_MSVC<1300)

#define BOOST_MULTI_INDEX_LIMIT_INDEXED_BY_SIZE 5

#else

#define BOOST_MULTI_INDEX_LIMIT_INDEXED_BY_SIZE BOOST_MPL_LIMIT_VECTOR_SIZE

#endif

#endif

#if BOOST_MULTI_INDEX_LIMIT_INDEXED_BY_SIZE<BOOST_MPL_LIMIT_VECTOR_SIZE

#define BOOST_MULTI_INDEX_INDEXED_BY_SIZE \

  BOOST_MULTI_INDEX_LIMIT_INDEXED_BY_SIZE

#else

#define BOOST_MULTI_INDEX_INDEXED_BY_SIZE BOOST_MPL_LIMIT_VECTOR_SIZE

#endif

#define BOOST_MULTI_INDEX_INDEXED_BY_TEMPLATE_PARM(z,n,var) \

  typename BOOST_PP_CAT(var,n) BOOST_PP_EXPR_IF(n,=mpl::na)

namespace boost{

namespace multi_index{

template<

  BOOST_PP_ENUM(

    BOOST_MULTI_INDEX_INDEXED_BY_SIZE,

    BOOST_MULTI_INDEX_INDEXED_BY_TEMPLATE_PARM,T)

>

struct indexed_by:

  mpl::vector<BOOST_PP_ENUM_PARAMS(BOOST_MULTI_INDEX_INDEXED_BY_SIZE,T)>

{

};

} /* namespace multi_index */

} /* namespace boost */

#undef BOOST_MULTI_INDEX_INDEXED_BY_TEMPLATE_PARM

#undef BOOST_MULTI_INDEX_INDEXED_BY_SIZE

#endif