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1 | ////////////////////////////////////////////////////////////////////////////// |
2 | // (c) Copyright Andreas Huber Doenni 2002-2005, Eric Niebler 2006 | |
3 | // Distributed under the Boost Software License, Version 1.0. (See accompany- | |
4 | // ing file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt) | |
5 | ////////////////////////////////////////////////////////////////////////////// | |
6 | ||
7 | #ifndef BOOST_XPRESSIVE_DETAIL_UTILITY_COUNTED_BASE_HPP_EAN_04_16_2006 | |
8 | #define BOOST_XPRESSIVE_DETAIL_UTILITY_COUNTED_BASE_HPP_EAN_04_16_2006 | |
9 | ||
10 | #include <boost/assert.hpp> | |
11 | #include <boost/checked_delete.hpp> | |
12 | #include <boost/detail/atomic_count.hpp> | |
13 | ||
14 | namespace boost { namespace xpressive { namespace detail | |
15 | { | |
16 | template<typename Derived> | |
17 | struct counted_base_access; | |
18 | ||
19 | ////////////////////////////////////////////////////////////////////////////// | |
20 | // counted_base | |
21 | template<typename Derived> | |
22 | struct counted_base | |
23 | { | |
24 | long use_count() const | |
25 | { | |
26 | return this->count_; | |
27 | } | |
28 | ||
29 | protected: | |
30 | counted_base() | |
31 | : count_(0) | |
32 | { | |
33 | } | |
34 | ||
35 | counted_base(counted_base<Derived> const &) | |
36 | : count_(0) | |
37 | { | |
38 | } | |
39 | ||
40 | counted_base &operator =(counted_base<Derived> const &) | |
41 | { | |
42 | return *this; | |
43 | } | |
44 | ||
45 | private: | |
46 | friend struct counted_base_access<Derived>; | |
47 | mutable boost::detail::atomic_count count_; | |
48 | }; | |
49 | ||
50 | ////////////////////////////////////////////////////////////////////////////// | |
51 | // counted_base_access | |
52 | template<typename Derived> | |
53 | struct counted_base_access | |
54 | { | |
55 | static void add_ref(counted_base<Derived> const *that) | |
56 | { | |
57 | ++that->count_; | |
58 | } | |
59 | ||
60 | static void release(counted_base<Derived> const *that) | |
61 | { | |
62 | BOOST_ASSERT(0 < that->count_); | |
63 | if(0 == --that->count_) | |
64 | { | |
65 | boost::checked_delete(static_cast<Derived const *>(that)); | |
66 | } | |
67 | } | |
68 | }; | |
69 | ||
70 | template<typename Derived> | |
71 | inline void intrusive_ptr_add_ref(counted_base<Derived> const *that) | |
72 | { | |
73 | counted_base_access<Derived>::add_ref(that); | |
74 | } | |
75 | ||
76 | template<typename Derived> | |
77 | inline void intrusive_ptr_release(counted_base<Derived> const *that) | |
78 | { | |
79 | counted_base_access<Derived>::release(that); | |
80 | } | |
81 | ||
82 | }}} // namespace boost::xpressive::detail | |
83 | ||
84 | #endif |