The class means

The class means  is derived from the SIM class resource .

class means : public resource 
{
public:
  means(histogram* h, double c = 1.0);    // histogram should be WEIGHTED
  means(double c = 1.0);                  // constructor, c = capacity

  void occupy_frequency(double a, bpgenerator* g = NULL, 
                        distribution db = EXACT, double b = 0);
                                          // set unavailability frequency
  void occupy_duration(double a, bpgenerator* g = NULL, 
                       distribution db = EXACT, double b = 0);
                                          // set unavailability duration
};

Objects of class means have a capacity that can be specified when creating the object. Take, for instance, a process where customers are served at counters and there are three counters. To simulate such a process one could create an object counter of class means with capacity three.

If certain means are also used in operations that are not part of the modelled process, one can use the members occupy_frequency and occupy_duration to specify how often -- the frequency -- and how long -- the duration -- the means are not available. The frequency and duration can be generated according to a certain distribution, specified by the parameters of the member functions occupy_frequency and occupy_duration.