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