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83 lines
2.0 KiB
83 lines
2.0 KiB
/* Copyright 2003-2008 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_DETAIL_UNBOUNDED_HPP |
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#define BOOST_MULTI_INDEX_DETAIL_UNBOUNDED_HPP |
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#if defined(_MSC_VER)&&(_MSC_VER>=1200) |
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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/detail/workaround.hpp> |
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namespace boost{ |
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namespace multi_index{ |
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/* dummy type and variable for use in ordered_index::range() */ |
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#if BOOST_WORKAROUND(BOOST_MSVC,<1300) |
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/* The default branch actually works for MSVC 6.0, but seems like |
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* this implementation of unbounded improves the performance of ordered |
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* indices! This behavior is hard to explain and probably a test artifact, |
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* but it does not hurt to have the workaround anyway. |
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*/ |
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namespace detail{struct unbounded_type{};} |
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namespace{ |
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static detail::unbounded_type unbounded_obj=detail::unbounded_type(); |
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static detail::unbounded_type& unbounded=unbounded_obj; |
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} /* unnamed */ |
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#else |
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/* ODR-abiding technique shown at the example attached to |
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* http://lists.boost.org/Archives/boost/2006/07/108355.php |
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*/ |
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namespace detail{class unbounded_helper;} |
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detail::unbounded_helper unbounded(detail::unbounded_helper); |
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namespace detail{ |
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class unbounded_helper |
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{ |
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unbounded_helper(){} |
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unbounded_helper(const unbounded_helper&){} |
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friend unbounded_helper multi_index::unbounded(unbounded_helper); |
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}; |
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typedef unbounded_helper (*unbounded_type)(unbounded_helper); |
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} /* namespace multi_index::detail */ |
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inline detail::unbounded_helper unbounded(detail::unbounded_helper) |
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{ |
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return detail::unbounded_helper(); |
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} |
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#endif |
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/* tags used in the implementation of range */ |
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namespace detail{ |
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struct none_unbounded_tag{}; |
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struct lower_unbounded_tag{}; |
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struct upper_unbounded_tag{}; |
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struct both_unbounded_tag{}; |
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} /* namespace multi_index::detail */ |
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} /* namespace multi_index */ |
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} /* namespace boost */ |
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#endif
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