/* 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