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1 | ////////////////////////////////////////////////////////////////////////////// |
2 | // | |
3 | // (C) Copyright Ion Gaztanaga 2005-2012. Distributed under the Boost | |
4 | // Software License, Version 1.0. (See accompanying file | |
5 | // LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt) | |
6 | // | |
7 | // See http://www.boost.org/libs/interprocess for documentation. | |
8 | // | |
9 | ////////////////////////////////////////////////////////////////////////////// | |
10 | #ifndef BOOST_INTERPROCESS_NULL_INDEX_HPP | |
11 | #define BOOST_INTERPROCESS_NULL_INDEX_HPP | |
12 | ||
13 | #ifndef BOOST_CONFIG_HPP | |
14 | # include <boost/config.hpp> | |
15 | #endif | |
16 | # | |
17 | #if defined(BOOST_HAS_PRAGMA_ONCE) | |
18 | # pragma once | |
19 | #endif | |
20 | ||
21 | #include <boost/interprocess/detail/config_begin.hpp> | |
22 | #include <boost/interprocess/detail/workaround.hpp> | |
23 | ||
24 | #include <boost/interprocess/offset_ptr.hpp> | |
25 | ||
26 | //!\file | |
27 | //!Describes a null index adaptor, so that if we don't want to construct | |
28 | //!named objects, we can use this null index type to save resources. | |
29 | ||
30 | namespace boost { | |
31 | namespace interprocess { | |
32 | ||
33 | //!Null index type | |
34 | //!used to save compilation time when | |
35 | //!named indexes are not needed. | |
36 | template <class MapConfig> | |
37 | class null_index | |
38 | { | |
39 | #if !defined(BOOST_INTERPROCESS_DOXYGEN_INVOKED) | |
40 | typedef typename MapConfig:: | |
41 | segment_manager_base segment_manager_base; | |
42 | #endif //#ifndef BOOST_INTERPROCESS_DOXYGEN_INVOKED | |
43 | ||
44 | public: | |
45 | typedef int * iterator; | |
46 | typedef const int * const_iterator; | |
47 | ||
48 | //!begin() is equal | |
49 | //!to end() | |
50 | const_iterator begin() const | |
51 | { return const_iterator(0); } | |
52 | ||
53 | //!begin() is equal | |
54 | //!to end() | |
55 | iterator begin() | |
56 | { return iterator(0); } | |
57 | ||
58 | //!begin() is equal | |
59 | //!to end() | |
60 | const_iterator end() const | |
61 | { return const_iterator(0); } | |
62 | ||
63 | //!begin() is equal | |
64 | //!to end() | |
65 | iterator end() | |
66 | { return iterator(0); } | |
67 | ||
68 | //!Empty constructor | |
69 | null_index(segment_manager_base *){} | |
70 | }; | |
71 | ||
72 | }} //namespace boost { namespace interprocess { | |
73 | ||
74 | #include <boost/interprocess/detail/config_end.hpp> | |
75 | ||
76 | #endif //#ifndef BOOST_INTERPROCESS_NULL_INDEX_HPP |