89 lines
2.4 KiB
Plaintext
89 lines
2.4 KiB
Plaintext
/* Copyright 2003-2013 Joaquin M Lopez Munoz.
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* Distributed under the Boost Software License, Version 1.0.
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* (See accompanying file LICENSE_1_0.txt or copy at
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* http://www.boost.org/LICENSE_1_0.txt)
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*
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* See http://www.boost.org/libs/multi_index for library home page.
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*/
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#ifndef BOOST_MULTI_INDEX_TAG_HPP
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#define BOOST_MULTI_INDEX_TAG_HPP
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#if defined(_MSC_VER)
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#pragma once
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#endif
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#include <boost/config.hpp> /* keep it first to prevent nasty warns in MSVC */
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#include <boost/multi_index/detail/no_duplicate_tags.hpp>
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#include <boost/mpl/identity.hpp>
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#include <boost/mpl/transform.hpp>
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#include <boost/mpl/vector.hpp>
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#include <boost/preprocessor/facilities/intercept.hpp>
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#include <boost/preprocessor/repetition/enum_binary_params.hpp>
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#include <boost/preprocessor/repetition/enum_params.hpp>
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#include <boost/static_assert.hpp>
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#include <boost/type_traits/is_base_and_derived.hpp>
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/* A wrapper of mpl::vector used to hide MPL from the user.
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* tag contains types used as tag names for indices in get() functions.
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*/
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/* This user_definable macro limits the number of elements of a tag;
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* useful for shortening resulting symbol names (MSVC++ 6.0, for instance,
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* has problems coping with very long symbol names.)
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*/
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#if !defined(BOOST_MULTI_INDEX_LIMIT_TAG_SIZE)
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#define BOOST_MULTI_INDEX_LIMIT_TAG_SIZE BOOST_MPL_LIMIT_VECTOR_SIZE
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#endif
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#if BOOST_MULTI_INDEX_LIMIT_TAG_SIZE<BOOST_MPL_LIMIT_VECTOR_SIZE
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#define BOOST_MULTI_INDEX_TAG_SIZE BOOST_MULTI_INDEX_LIMIT_TAG_SIZE
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#else
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#define BOOST_MULTI_INDEX_TAG_SIZE BOOST_MPL_LIMIT_VECTOR_SIZE
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#endif
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namespace boost{
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namespace multi_index{
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namespace detail{
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struct tag_marker{};
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template<typename T>
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struct is_tag
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{
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BOOST_STATIC_CONSTANT(bool,value=(is_base_and_derived<tag_marker,T>::value));
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};
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} /* namespace multi_index::detail */
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template<
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BOOST_PP_ENUM_BINARY_PARAMS(
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BOOST_MULTI_INDEX_TAG_SIZE,
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typename T,
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=mpl::na BOOST_PP_INTERCEPT)
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>
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struct tag:private detail::tag_marker
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{
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/* The mpl::transform pass produces shorter symbols (without
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* trailing mpl::na's.)
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*/
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typedef typename mpl::transform<
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mpl::vector<BOOST_PP_ENUM_PARAMS(BOOST_MULTI_INDEX_TAG_SIZE,T)>,
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mpl::identity<mpl::_1>
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>::type type;
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BOOST_STATIC_ASSERT(detail::no_duplicate_tags<type>::value);
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};
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} /* namespace multi_index */
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} /* namespace boost */
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#undef BOOST_MULTI_INDEX_TAG_SIZE
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#endif
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