text: /* 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_INDEXED_BY_HPP
  #define BOOST_MULTI_INDEX_INDEXED_BY_HPP
  
  #if defined(_MSC_VER)
  #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)
  #define BOOST_MULTI_INDEX_LIMIT_INDEXED_BY_SIZE BOOST_MPL_LIMIT_VECTOR_SIZE
  #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
  