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- /* Copyright 2003-2013 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)
- #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)
- #define BOOST_MULTI_INDEX_LIMIT_TAG_SIZE BOOST_MPL_LIMIT_VECTOR_SIZE
- #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
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