1 | /* Copyright 2003-2005 Joaquín M López Muñoz.
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2 | * Distributed under the Boost Software License, Version 1.0.
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3 | * (See accompanying file LICENSE_1_0.txt or copy at
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4 | * http://www.boost.org/LICENSE_1_0.txt)
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5 | *
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6 | * See http://www.boost.org/libs/multi_index for library home page.
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7 | */
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8 |
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9 | #ifndef BOOST_MULTI_INDEX_TAG_HPP
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10 | #define BOOST_MULTI_INDEX_TAG_HPP
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11 |
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12 | #if defined(_MSC_VER)&&(_MSC_VER>=1200)
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13 | #pragma once
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14 | #endif
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15 |
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16 | #include <boost/config.hpp> /* keep it first to prevent nasty warns in MSVC */
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17 | #include <boost/multi_index/detail/no_duplicate_tags.hpp>
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18 | #include <boost/mpl/identity.hpp>
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19 | #include <boost/mpl/transform.hpp>
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20 | #include <boost/mpl/vector.hpp>
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21 | #include <boost/preprocessor/facilities/intercept.hpp>
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22 | #include <boost/preprocessor/repetition/enum_binary_params.hpp>
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23 | #include <boost/preprocessor/repetition/enum_params.hpp>
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24 | #include <boost/static_assert.hpp>
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25 | #include <boost/type_traits/is_base_and_derived.hpp>
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26 |
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27 | /* A wrapper of mpl::vector used to hide MPL from the user.
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28 | * tag contains types used as tag names for indices in get() functions.
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29 | */
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30 |
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31 | /* This user_definable macro limits the number of elements of a tag;
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32 | * useful for shortening resulting symbol names (MSVC++ 6.0, for instance,
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33 | * has problems coping with very long symbol names.)
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34 | */
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35 |
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36 | #if !defined(BOOST_MULTI_INDEX_LIMIT_TAG_SIZE)
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37 | #if defined(BOOST_MSVC)&&(BOOST_MSVC<1300)
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38 | #define BOOST_MULTI_INDEX_LIMIT_TAG_SIZE 3
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39 | #else
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40 | #define BOOST_MULTI_INDEX_LIMIT_TAG_SIZE BOOST_MPL_LIMIT_VECTOR_SIZE
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41 | #endif
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42 | #endif
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43 |
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44 | #if BOOST_MULTI_INDEX_LIMIT_TAG_SIZE<BOOST_MPL_LIMIT_VECTOR_SIZE
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45 | #define BOOST_MULTI_INDEX_TAG_SIZE BOOST_MULTI_INDEX_LIMIT_TAG_SIZE
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46 | #else
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47 | #define BOOST_MULTI_INDEX_TAG_SIZE BOOST_MPL_LIMIT_VECTOR_SIZE
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48 | #endif
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49 |
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50 | namespace boost{
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51 |
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52 | namespace multi_index{
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53 |
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54 | namespace detail{
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55 |
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56 | struct tag_marker{};
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57 |
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58 | template<typename T>
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59 | struct is_tag
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60 | {
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61 | BOOST_STATIC_CONSTANT(bool,value=(is_base_and_derived<tag_marker,T>::value));
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62 | };
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63 |
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64 | } /* namespace multi_index::detail */
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65 |
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66 | template<
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67 | BOOST_PP_ENUM_BINARY_PARAMS(
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68 | BOOST_MULTI_INDEX_TAG_SIZE,
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69 | typename T,
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70 | =mpl::na BOOST_PP_INTERCEPT)
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71 | >
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72 | struct tag:private detail::tag_marker
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73 | {
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74 | /* The mpl::transform pass produces shorter symbols (without
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75 | * trailing mpl::na's.)
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76 | */
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77 |
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78 | typedef typename mpl::transform<
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79 | mpl::vector<BOOST_PP_ENUM_PARAMS(BOOST_MULTI_INDEX_TAG_SIZE,T)>,
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80 | mpl::identity<mpl::_1>
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81 | >::type type;
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82 |
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83 | BOOST_STATIC_ASSERT(detail::no_duplicate_tags<type>::value);
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84 | };
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85 |
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86 | } /* namespace multi_index */
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87 |
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88 | } /* namespace boost */
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89 |
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90 | #undef BOOST_MULTI_INDEX_TAG_SIZE
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91 |
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92 | #endif
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