williamr@2: /* Copyright 2003-2006 Joaquín M López Muñoz.
williamr@2:  * Distributed under the Boost Software License, Version 1.0.
williamr@2:  * (See accompanying file LICENSE_1_0.txt or copy at
williamr@2:  * http://www.boost.org/LICENSE_1_0.txt)
williamr@2:  *
williamr@2:  * See http://www.boost.org/libs/multi_index for library home page.
williamr@2:  */
williamr@2: 
williamr@2: #ifndef BOOST_MULTI_INDEX_DETAIL_UNBOUNDED_HPP
williamr@2: #define BOOST_MULTI_INDEX_DETAIL_UNBOUNDED_HPP
williamr@2: 
williamr@2: #if defined(_MSC_VER)&&(_MSC_VER>=1200)
williamr@2: #pragma once
williamr@2: #endif
williamr@2: 
williamr@2: #include <boost/config.hpp> /* keep it first to prevent nasty warns in MSVC */
williamr@2: #include <boost/detail/workaround.hpp>
williamr@2: 
williamr@2: namespace boost{
williamr@2: 
williamr@2: namespace multi_index{
williamr@2: 
williamr@2: /* dummy type and variable for use in ordered_index::range() */
williamr@2: 
williamr@2: namespace detail{
williamr@2: 
williamr@2: struct unbounded_type{};
williamr@2: 
williamr@2: } /* namespace multi_index::detail */
williamr@2: 
williamr@2: namespace{
williamr@2: 
williamr@2: #if BOOST_WORKAROUND(BOOST_MSVC,<1300)
williamr@2: /* The default branch actually works for MSVC 6.0, but seems like
williamr@2:  * the const qualifier reduces the performance of ordered indices! This
williamr@2:  * behavior is hard to explain and probably a test artifact, but it
williamr@2:  * does not hurt to have the workaround anyway.
williamr@2:  */
williamr@2: 
williamr@2: static detail::unbounded_type  unbounded_obj=detail::unbounded_type();
williamr@2: static detail::unbounded_type& unbounded=unbounded_obj;
williamr@2: #else
williamr@2: const detail::unbounded_type unbounded=detail::unbounded_type();
williamr@2: #endif
williamr@2: 
williamr@2: } /* unnamed */
williamr@2: 
williamr@2: } /* namespace multi_index */
williamr@2: 
williamr@2: } /* namespace boost */
williamr@2: 
williamr@2: #endif