impdel.hxx

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#ifndef INCLUDED_VCL_IMPDEL_HXX
#define INCLUDED_VCL_IMPDEL_HXX
 
#include <algorithm>
#include <vector>
 
namespace vcl
{
 
class DeletionListener;
 
class DeletionNotifier
{
    std::vector< DeletionListener* > m_aListeners;
    protected:
    DeletionNotifier() {}
 
    ~DeletionNotifier()
    { notifyDelete(); }
 
    inline void notifyDelete();
 
    public:
    void addDel( DeletionListener* pListener )
    { m_aListeners.push_back( pListener ); }
 
    void removeDel( DeletionListener* pListener )
    { m_aListeners.erase(std::remove(m_aListeners.begin(), m_aListeners.end(), pListener), m_aListeners.end()); }
};
 
class DeletionListener
{
    DeletionNotifier*  m_pNotifier;
    public:
    DeletionListener( DeletionNotifier* pNotifier )
    :  m_pNotifier( pNotifier )
       {
           if( m_pNotifier )
               m_pNotifier->addDel( this );
       }
   ~DeletionListener()
   {
       if( m_pNotifier )
           m_pNotifier->removeDel( this );
   }
   void deleted() { m_pNotifier = nullptr; }
   bool isDeleted() const { return (m_pNotifier == nullptr); }
};
 
inline void DeletionNotifier::notifyDelete()
{
    for( auto& rListener : m_aListeners )
       rListener->deleted();
 
    m_aListeners.clear();
}
 
} // namespace vcl
 
#endif // INCLUDED_VCL_IMPDEL_HXX
 
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