/* 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 |