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1 /* Copyright 2003-2008 Joaquin M Lopez Munoz.
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2 * Distributed under the Boost Software License, Version 1.0.
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3 * (See accompanying file LICENSE_1_0.txt or copy at
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4 * http://www.boost.org/LICENSE_1_0.txt)
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5 *
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6 * See http://www.boost.org/libs/multi_index for library home page.
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7 */
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8
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9 #ifndef BOOST_MULTI_INDEX_DETAIL_UNBOUNDED_HPP
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10 #define BOOST_MULTI_INDEX_DETAIL_UNBOUNDED_HPP
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11
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12 #if defined(_MSC_VER)&&(_MSC_VER>=1200)
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13 #pragma once
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14 #endif
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15
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16 #include <boost/config.hpp> /* keep it first to prevent nasty warns in MSVC */
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17 #include <boost/detail/workaround.hpp>
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18
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19 namespace boost{
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20
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21 namespace multi_index{
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22
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23 /* dummy type and variable for use in ordered_index::range() */
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24
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25 #if BOOST_WORKAROUND(BOOST_MSVC,<1300)
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26 /* The default branch actually works for MSVC 6.0, but seems like
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27 * this implementation of unbounded improves the performance of ordered
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28 * indices! This behavior is hard to explain and probably a test artifact,
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29 * but it does not hurt to have the workaround anyway.
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30 */
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31
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32 namespace detail{struct unbounded_type{};}
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33
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34 namespace{
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35
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36 static detail::unbounded_type unbounded_obj=detail::unbounded_type();
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37 static detail::unbounded_type& unbounded=unbounded_obj;
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38
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39 } /* unnamed */
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40 #else
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41 /* ODR-abiding technique shown at the example attached to
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42 * http://lists.boost.org/Archives/boost/2006/07/108355.php
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43 */
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44
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45 namespace detail{class unbounded_helper;}
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46
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47 detail::unbounded_helper unbounded(detail::unbounded_helper);
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48
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49 namespace detail{
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50
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51 class unbounded_helper
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52 {
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53 unbounded_helper(){}
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54 unbounded_helper(const unbounded_helper&){}
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55 friend unbounded_helper multi_index::unbounded(unbounded_helper);
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56 };
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57
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58 typedef unbounded_helper (*unbounded_type)(unbounded_helper);
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59
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60 } /* namespace multi_index::detail */
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61
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62 inline detail::unbounded_helper unbounded(detail::unbounded_helper)
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63 {
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64 return detail::unbounded_helper();
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65 }
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66 #endif
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67
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68 /* tags used in the implementation of range */
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69
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70 namespace detail{
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71
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72 struct none_unbounded_tag{};
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73 struct lower_unbounded_tag{};
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74 struct upper_unbounded_tag{};
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75 struct both_unbounded_tag{};
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76
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77 } /* namespace multi_index::detail */
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78
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79 } /* namespace multi_index */
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80
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81 } /* namespace boost */
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82
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83 #endif
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