| /* Copyright 2003-2008 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_TAG_HPP |
| #define BOOST_MULTI_INDEX_TAG_HPP |
| |
| #if defined(_MSC_VER)&&(_MSC_VER>=1200) |
| #pragma once |
| #endif |
| |
| #include <boost/config.hpp> /* keep it first to prevent nasty warns in MSVC */ |
| #include <boost/multi_index/detail/no_duplicate_tags.hpp> |
| #include <boost/mpl/identity.hpp> |
| #include <boost/mpl/transform.hpp> |
| #include <boost/mpl/vector.hpp> |
| #include <boost/preprocessor/facilities/intercept.hpp> |
| #include <boost/preprocessor/repetition/enum_binary_params.hpp> |
| #include <boost/preprocessor/repetition/enum_params.hpp> |
| #include <boost/static_assert.hpp> |
| #include <boost/type_traits/is_base_and_derived.hpp> |
| |
| /* A wrapper of mpl::vector used to hide MPL from the user. |
| * tag contains types used as tag names for indices in get() functions. |
| */ |
| |
| /* This user_definable macro limits the number of elements of a tag; |
| * 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_TAG_SIZE) |
| #if defined(BOOST_MSVC)&&(BOOST_MSVC<1300) |
| #define BOOST_MULTI_INDEX_LIMIT_TAG_SIZE 3 |
| #else |
| #define BOOST_MULTI_INDEX_LIMIT_TAG_SIZE BOOST_MPL_LIMIT_VECTOR_SIZE |
| #endif |
| #endif |
| |
| #if BOOST_MULTI_INDEX_LIMIT_TAG_SIZE<BOOST_MPL_LIMIT_VECTOR_SIZE |
| #define BOOST_MULTI_INDEX_TAG_SIZE BOOST_MULTI_INDEX_LIMIT_TAG_SIZE |
| #else |
| #define BOOST_MULTI_INDEX_TAG_SIZE BOOST_MPL_LIMIT_VECTOR_SIZE |
| #endif |
| |
| namespace boost{ |
| |
| namespace multi_index{ |
| |
| namespace detail{ |
| |
| struct tag_marker{}; |
| |
| template<typename T> |
| struct is_tag |
| { |
| BOOST_STATIC_CONSTANT(bool,value=(is_base_and_derived<tag_marker,T>::value)); |
| }; |
| |
| } /* namespace multi_index::detail */ |
| |
| template< |
| BOOST_PP_ENUM_BINARY_PARAMS( |
| BOOST_MULTI_INDEX_TAG_SIZE, |
| typename T, |
| =mpl::na BOOST_PP_INTERCEPT) |
| > |
| struct tag:private detail::tag_marker |
| { |
| /* The mpl::transform pass produces shorter symbols (without |
| * trailing mpl::na's.) |
| */ |
| |
| typedef typename mpl::transform< |
| mpl::vector<BOOST_PP_ENUM_PARAMS(BOOST_MULTI_INDEX_TAG_SIZE,T)>, |
| mpl::identity<mpl::_1> |
| >::type type; |
| |
| BOOST_STATIC_ASSERT(detail::no_duplicate_tags<type>::value); |
| }; |
| |
| } /* namespace multi_index */ |
| |
| } /* namespace boost */ |
| |
| #undef BOOST_MULTI_INDEX_TAG_SIZE |
| |
| #endif |