1 | #ifndef BOOST_STATECHART_EVENT_BASE_HPP_INCLUDED |
2 | #define BOOST_STATECHART_EVENT_BASE_HPP_INCLUDED |
3 | ////////////////////////////////////////////////////////////////////////////// |
4 | // Copyright 2002-2006 Andreas Huber Doenni |
5 | // Distributed under the Boost Software License, Version 1.0. (See accompany- |
6 | // ing file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt) |
7 | ////////////////////////////////////////////////////////////////////////////// |
8 | |
9 | |
10 | |
11 | #include <boost/statechart/detail/rtti_policy.hpp> |
12 | #include <boost/statechart/detail/counted_base.hpp> |
13 | |
14 | #include <boost/assert.hpp> |
15 | #include <boost/intrusive_ptr.hpp> |
16 | #include <boost/config.hpp> |
17 | |
18 | |
19 | |
20 | namespace boost |
21 | { |
22 | namespace statechart |
23 | { |
24 | namespace detail |
25 | { |
26 | |
27 | |
28 | |
29 | // This helper is necessary because there doesn't seem to be consensus among |
30 | // compilers on how a friend declaration for a function in another namespace |
31 | // has to look like. |
32 | class delete_helper |
33 | { |
34 | public: |
35 | template< class T > |
36 | static void delete_object( const T * pObject ) |
37 | { |
38 | delete pObject; |
39 | } |
40 | }; |
41 | |
42 | |
43 | |
44 | } // namespace detail |
45 | |
46 | |
47 | |
48 | ////////////////////////////////////////////////////////////////////////////// |
49 | class event_base : public detail::rtti_policy::rtti_base_type< |
50 | detail::counted_base<> > |
51 | { |
52 | typedef detail::rtti_policy::rtti_base_type< |
53 | detail::counted_base<> > base_type; |
54 | public: |
55 | ////////////////////////////////////////////////////////////////////////// |
56 | intrusive_ptr< const event_base > intrusive_from_this() const; |
57 | |
58 | protected: |
59 | ////////////////////////////////////////////////////////////////////////// |
60 | event_base( detail::rtti_policy::id_provider_type idProvider ) : |
61 | base_type( idProvider ) |
62 | { |
63 | } |
64 | |
65 | virtual ~event_base() {} |
66 | |
67 | private: |
68 | ////////////////////////////////////////////////////////////////////////// |
69 | virtual intrusive_ptr< const event_base > clone() const = 0; |
70 | |
71 | friend class detail::delete_helper; |
72 | }; |
73 | |
74 | |
75 | |
76 | #ifdef BOOST_NO_ARGUMENT_DEPENDENT_LOOKUP |
77 | } // namespace statechart |
78 | #endif |
79 | |
80 | |
81 | |
82 | inline void intrusive_ptr_add_ref( const ::boost::statechart::event_base * pBase ) |
83 | { |
84 | pBase->add_ref(); |
85 | } |
86 | |
87 | inline void intrusive_ptr_release( const ::boost::statechart::event_base * pBase ) |
88 | { |
89 | if ( pBase->release() ) |
90 | { |
91 | ::boost::statechart::detail::delete_helper::delete_object( pObject: pBase ); |
92 | } |
93 | } |
94 | |
95 | |
96 | |
97 | #ifndef BOOST_NO_ARGUMENT_DEPENDENT_LOOKUP |
98 | } // namespace statechart |
99 | #endif |
100 | namespace statechart |
101 | { |
102 | |
103 | |
104 | |
105 | // We're implementing this here so that GCC3.4.2 can find |
106 | // intrusive_ptr_add_ref, which is indirectly called from the intrusive_ptr |
107 | // ctor. |
108 | inline intrusive_ptr< const event_base > event_base::intrusive_from_this() const |
109 | { |
110 | if ( base_type::ref_counted() ) |
111 | { |
112 | return intrusive_ptr< const event_base >( this ); |
113 | } |
114 | else |
115 | { |
116 | return clone(); |
117 | } |
118 | } |
119 | |
120 | |
121 | |
122 | } // namespace statechart |
123 | } // namespace boost |
124 | |
125 | |
126 | |
127 | #endif |
128 | |