84 lines
2.0 KiB
C++
84 lines
2.0 KiB
C++
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/* 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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