projects / ceph.git / blame
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|---|---|---|
| 7c673cae FG |
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_TAG_HPP | |
| 10 | #define BOOST_MULTI_INDEX_TAG_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/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 | #define BOOST_MULTI_INDEX_LIMIT_TAG_SIZE BOOST_MPL_LIMIT_VECTOR_SIZE | |
| 38 | #endif | |
| 39 | ||
| 40 | #if BOOST_MULTI_INDEX_LIMIT_TAG_SIZE<BOOST_MPL_LIMIT_VECTOR_SIZE | |
| 41 | #define BOOST_MULTI_INDEX_TAG_SIZE BOOST_MULTI_INDEX_LIMIT_TAG_SIZE | |
| 42 | #else | |
| 43 | #define BOOST_MULTI_INDEX_TAG_SIZE BOOST_MPL_LIMIT_VECTOR_SIZE | |
| 44 | #endif | |
| 45 | ||
| 46 | namespace boost{ | |
| 47 | ||
| 48 | namespace multi_index{ | |
| 49 | ||
| 50 | namespace detail{ | |
| 51 | ||
| 52 | struct tag_marker{}; | |
| 53 | ||
| 54 | template<typename T> | |
| 55 | struct is_tag | |
| 56 | { | |
| 57 | BOOST_STATIC_CONSTANT(bool,value=(is_base_and_derived<tag_marker,T>::value)); | |
| 58 | }; | |
| 59 | ||
| 60 | } /* namespace multi_index::detail */ | |
| 61 | ||
| 62 | template< | |
| 63 | BOOST_PP_ENUM_BINARY_PARAMS( | |
| 64 | BOOST_MULTI_INDEX_TAG_SIZE, | |
| 65 | typename T, | |
| 66 | =mpl::na BOOST_PP_INTERCEPT) | |
| 67 | > | |
| 68 | struct tag:private detail::tag_marker | |
| 69 | { | |
| 70 | /* The mpl::transform pass produces shorter symbols (without | |
| 71 | * trailing mpl::na's.) | |
| 72 | */ | |
| 73 | ||
| 74 | typedef typename mpl::transform< | |
| 75 | mpl::vector<BOOST_PP_ENUM_PARAMS(BOOST_MULTI_INDEX_TAG_SIZE,T)>, | |
| 76 | mpl::identity<mpl::_1> | |
| 77 | >::type type; | |
| 78 | ||
| 79 | BOOST_STATIC_ASSERT(detail::no_duplicate_tags<type>::value); | |
| 80 | }; | |
| 81 | ||
| 82 | } /* namespace multi_index */ | |
| 83 | ||
| 84 | } /* namespace boost */ | |
| 85 | ||
| 86 | #undef BOOST_MULTI_INDEX_TAG_SIZE | |
| 87 | ||
| 88 | #endif |