1/* Copyright 2003-2013 Joaquin M Lopez Munoz.
2 * Distributed under the Boost Software License, Version 1.0.
3 * (See accompanying file LICENSE_1_0.txt or copy at
4 * http://www.boost.org/LICENSE_1_0.txt)
5 *
6 * See http://www.boost.org/libs/multi_index for library home page.
7 */
8
9#ifndef BOOST_MULTI_INDEX_INDEXED_BY_HPP
10#define BOOST_MULTI_INDEX_INDEXED_BY_HPP
11
12#if defined(_MSC_VER)
13#pragma once
14#endif
15
16#include <boost/config.hpp> /* keep it first to prevent nasty warns in MSVC */
17#include <boost/mpl/vector.hpp>
18#include <boost/preprocessor/cat.hpp>
19#include <boost/preprocessor/control/expr_if.hpp>
20#include <boost/preprocessor/repetition/enum.hpp>
21#include <boost/preprocessor/repetition/enum_params.hpp>
22
23/* An alias to mpl::vector used to hide MPL from the user.
24 * indexed_by contains the index specifiers for instantiation
25 * of a multi_index_container.
26 */
27
28/* This user_definable macro limits the number of elements of an index list;
29 * useful for shortening resulting symbol names (MSVC++ 6.0, for instance,
30 * has problems coping with very long symbol names.)
31 */
32
33#if !defined(BOOST_MULTI_INDEX_LIMIT_INDEXED_BY_SIZE)
34#define BOOST_MULTI_INDEX_LIMIT_INDEXED_BY_SIZE BOOST_MPL_LIMIT_VECTOR_SIZE
35#endif
36
37#if BOOST_MULTI_INDEX_LIMIT_INDEXED_BY_SIZE<BOOST_MPL_LIMIT_VECTOR_SIZE
38#define BOOST_MULTI_INDEX_INDEXED_BY_SIZE \
39 BOOST_MULTI_INDEX_LIMIT_INDEXED_BY_SIZE
40#else
41#define BOOST_MULTI_INDEX_INDEXED_BY_SIZE BOOST_MPL_LIMIT_VECTOR_SIZE
42#endif
43
44#define BOOST_MULTI_INDEX_INDEXED_BY_TEMPLATE_PARM(z,n,var) \
45 typename BOOST_PP_CAT(var,n) BOOST_PP_EXPR_IF(n,=mpl::na)
46
47namespace boost{
48
49namespace multi_index{
50
51template<
52 BOOST_PP_ENUM(
53 BOOST_MULTI_INDEX_INDEXED_BY_SIZE,
54 BOOST_MULTI_INDEX_INDEXED_BY_TEMPLATE_PARM,T)
55>
56struct indexed_by:
57 mpl::vector<BOOST_PP_ENUM_PARAMS(BOOST_MULTI_INDEX_INDEXED_BY_SIZE,T)>
58{
59};
60
61} /* namespace multi_index */
62
63} /* namespace boost */
64
65#undef BOOST_MULTI_INDEX_INDEXED_BY_TEMPLATE_PARM
66#undef BOOST_MULTI_INDEX_INDEXED_BY_SIZE
67
68#endif
69