Re: Class

[jalex]

David Aliaga <address@hidden> writes:

> Hello.
> I would like to ask if it is possible in Swarm to do
> the following:
> 
> if([capture isKindOf: [A_Prey Class]])
> { ........
> }

Swarm is built upon Objective C, so anything you can do in Objective C
you can do in Swarm.  In particular, the isKindOf method works in just
the manner described (except the method name is "class" and not
"Class").  Here's how I use it in one of my models:

- (void) updatePopulationCount
{
  int x,y;
  int maxX = [data_source getSizeX];
  int maxY = [data_source getSizeY];

  [self resetPopulationCount];

  for (x=0; x < maxX; x++) {
    for (y=0; y < maxY; y++) {
      // Count the number of each kind of agent we have
      id agent = [data_source getObjectAtX: x Y: y];
      if ( [agent isKindOf: [MimicBestNeighborAgent class]] )
        class_count[MIMIC_BEST_NEIGHBOR]++;
      else if ( [agent isKindOf: [MimicBestAverageStrategyAgent class]] )
        class_count[MIMIC_BEST_AVERAGE_STRATEGY]++;
      else if ( [agent isKindOf: [MimicWithProbAgent class]] )
        class_count[MIMIC_WITH_PROB_PROP_TO_SUCCESS]++;
      else if ( [agent isKindOf: [BestResponseAgent class]] )
        class_count[BEST_RESPONSE_STRATEGY]++;
    }
  }

  // Irrelevant stuff deleted

}

Cheers,

Jason

-- 
Jason Alexander                   
Logic & Philosophy of Science      email:       address@hidden
School of Social Sciences          department:  http://hypatia.ss.uci.edu/lps
University of California, Irvine   phone:       (949) 824-1520

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