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       1                 :            : /* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
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      28                 :            : 
      29                 :            : #ifndef _SDR_OBJECTUSER_HXX
      30                 :            : #define _SDR_OBJECTUSER_HXX
      31                 :            : 
      32                 :            : #include <vector>
      33                 :            : 
      34                 :            : ////////////////////////////////////////////////////////////////////////////////////////////////////
      35                 :            : // predeclarations
      36                 :            : class SdrObject;
      37                 :            : 
      38                 :            : ////////////////////////////////////////////////////////////////////////////////////////////////////
      39                 :            : // To make things more safe, allow users of the page to register at it. The users need to be derived
      40                 :            : // from sdr::PageUser to get a call. The users do not need to call RemovePageUser() at the page
      41                 :            : // when they get called from PageInDestruction().
      42                 :            : 
      43                 :            : namespace sdr
      44                 :            : {
      45                 :       1444 :     class ObjectUser
      46                 :            :     {
      47                 :            :     public:
      48                 :            :         // this method is called form the destructor of the referenced page.
      49                 :            :         // do all necessary action to forget the page. It is not necessary to call
      50                 :            :         // RemovePageUser(), that is done form the destructor.
      51                 :            :         virtual void ObjectInDestruction(const SdrObject& rObject) = 0;
      52                 :            : 
      53                 :            :     protected:
      54                 :       1426 :         ~ObjectUser() {}
      55                 :            :     };
      56                 :            : 
      57                 :            :     // typedef for ObjectUserVector
      58                 :            :     typedef ::std::vector< ObjectUser* > ObjectUserVector;
      59                 :            : } // end of namespace sdr
      60                 :            : 
      61                 :            : ////////////////////////////////////////////////////////////////////////////////////////////////////
      62                 :            : 
      63                 :            : #endif //_SDR_OBJECTUSER_HXX
      64                 :            : 
      65                 :            : /* vim:set shiftwidth=4 softtabstop=4 expandtab: */