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/* 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
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