/* 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