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19 
20 #ifndef INCLUDED_VCL_IMPDEL_HXX
21 #define INCLUDED_VCL_IMPDEL_HXX
22 
23 #include <list>
24 
25 namespace vcl
26 {
27 
28 class DeletionListener;
29 
30 class DeletionNotifier
31 {
32     std::list< DeletionListener* > m_aListeners;
33     protected:
DeletionNotifier()34     DeletionNotifier() {}
35 
~DeletionNotifier()36     ~DeletionNotifier()
37     { notifyDelete(); }
38 
39     inline void notifyDelete();
40 
41     public:
addDel(DeletionListener * pListener)42     void addDel( DeletionListener* pListener )
43     { m_aListeners.push_back( pListener ); }
44 
removeDel(DeletionListener * pListener)45     void removeDel( DeletionListener* pListener )
46     { m_aListeners.remove( pListener ); }
47 };
48 
49 class DeletionListener
50 {
51     DeletionNotifier*  m_pNotifier;
52     public:
DeletionListener(DeletionNotifier * pNotifier)53     DeletionListener( DeletionNotifier* pNotifier )
54     :  m_pNotifier( pNotifier )
55        {
56            if( m_pNotifier )
57                m_pNotifier->addDel( this );
58        }
~DeletionListener()59    ~DeletionListener()
60    {
61        if( m_pNotifier )
62            m_pNotifier->removeDel( this );
63    }
deleted()64    void deleted() { m_pNotifier = nullptr; }
isDeleted() const65    bool isDeleted() const { return (m_pNotifier == nullptr); }
66 };
67 
notifyDelete()68 inline void DeletionNotifier::notifyDelete()
69 {
70     for( auto& rListener : m_aListeners )
71        rListener->deleted();
72 
73     m_aListeners.clear();
74 }
75 
76 } // namespace vcl
77 
78 #endif // INCLUDED_VCL_IMPDEL_HXX
79 
80 /* vim:set shiftwidth=4 softtabstop=4 expandtab: */
81