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