ceph/src/boost/libs/multi_index/include/boost/multi_index/detail/unbounded.hpp

   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 {
  37   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
  46 inline 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