1 /* Copyright 2003-2013 Joaquin M Lopez Munoz. 2 * Distributed under the Boost Software License, Version 1.0. 3 * (See accompanying file LICENSE_1_0.txt or copy at 4 * http://www.boost.org/LICENSE_1_0.txt) 5 * 6 * See http://www.boost.org/libs/multi_index for library home page. 7 */ 8 9 #ifndef BOOST_MULTI_INDEX_DETAIL_UNBOUNDED_HPP 10 #define BOOST_MULTI_INDEX_DETAIL_UNBOUNDED_HPP 11 12 #if defined(_MSC_VER) 13 #pragma once 14 #endif 15 16 #include <boost/config.hpp> /* keep it first to prevent nasty warns in MSVC */ 17 #include <boost/detail/workaround.hpp> 18 19 namespace boost{ 20 21 namespace multi_index{ 22 23 /* dummy type and variable for use in ordered_index::range() */ 24 25 /* ODR-abiding technique shown at the example attached to 26 * http://lists.boost.org/Archives/boost/2006/07/108355.php 27 */ 28 29 namespace detail{class unbounded_helper;} 30 31 detail::unbounded_helper unbounded(detail::unbounded_helper); 32 33 namespace detail{ 34 35 class unbounded_helper 36 { unbounded_helper()37 unbounded_helper(){} unbounded_helper(const unbounded_helper &)38 unbounded_helper(const unbounded_helper&){} 39 friend unbounded_helper multi_index::unbounded(unbounded_helper); 40 }; 41 42 typedef unbounded_helper (*unbounded_type)(unbounded_helper); 43 44 } /* namespace multi_index::detail */ 45 unbounded(detail::unbounded_helper)46inline detail::unbounded_helper unbounded(detail::unbounded_helper) 47 { 48 return detail::unbounded_helper(); 49 } 50 51 /* tags used in the implementation of range */ 52 53 namespace detail{ 54 55 struct none_unbounded_tag{}; 56 struct lower_unbounded_tag{}; 57 struct upper_unbounded_tag{}; 58 struct both_unbounded_tag{}; 59 60 } /* namespace multi_index::detail */ 61 62 } /* namespace multi_index */ 63 64 } /* namespace boost */ 65 66 #endif 67