Re: Function as an argument

[Akiko Ogawa - RS/GIS lab]

Marcus,

Ok, I changed the -goThroughEggsWith:InObj function as below and it worked!
Thanks.
Two more questions:
1) In my example, assuming that -scientificTest: takes one arguments and 
-conventionalTest: takes two arguments (though here it doesn't), is there any 
nice way for the -goThroughtEggWith:InObj function to detect how many arguments 
a passed function takes so that it can switch between [obj perform: sel with: 
egg] and [obj perform: sel with: egg with: somethingElse] in itself?

2) Can a selecter be a function that returns a value, as in M(getSomething), 
where, -(int) getSomething?

---- In object: EggCarton -----
// This method takes a method as arguments
- goThroughEggsWith: (SEL) sel InObj: obj {
  for (i=0;i<cartonSize;i++) {
   id egg = [eggCartonList atOffset: i];
   [obj perform: sel with: egg];
  }
  ...
}
---- In object: EggTester ----
- compareEggTestingMethods {

  (id <EggCarton>) eggCarton;
  // Here passing methods as arguments
  [eggCarton goThroughEggsWith: M(scientificTest:) InObj: self ];  
  [eggCarton goThroughEggsWith: M(conventionalTest:) InObj: self ];
  ...
}
// Followings are the passed methods.
- scientificTest: (id) egg {
  if ([technitian xRay: egg])
     boiledEggs++;
  ...
}
- conventionalTest: (id) egg {
  if ([kid spin: egg])
     boiledEggs++;
  ...
}

Thank you.
Akiko
-------------------------------------------
Akiko Ogawa
Forest Resources Department
Utah State University
address@hidden
-------------------------------------------


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