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
20namespace boost
21{
22namespace statechart
23{
24namespace 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.
32class 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//////////////////////////////////////////////////////////////////////////////
49class 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
82inline void intrusive_ptr_add_ref( const ::boost::statechart::event_base * pBase )
83{
84 pBase->add_ref();
85}
86
87inline 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
100namespace 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.
108inline 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

source code of boost/libs/statechart/include/boost/statechart/event_base.hpp