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21 
22 
23 
24 #ifndef SD_SLIDESORTER_COMMAND_HXX
25 #define SD_SLIDESORTER_COMMAND_HXX
26 
27 namespace sd { namespace slidesorter { namespace controller {
28 
29 /** Base class for command objects.  It specifies the interface for commands
30     whose execution can be scheduled via the SlotManager.
31 */
32 class Command
33 {
34 public:
~Command(void)35     virtual ~Command (void) {};
36     virtual void operator() (void) = 0;
37 };
38 
39 } } } // end of namespace sd::slidesorter::controller
40 
41 #endif
42