Errors from includes & casts

[DARREN MATTHEW SCHREIBER]

I recently changed one my methods in SchellingWorld.h to the following:

-findEmptyLocation: o {
  int x,y;
  int i;

  id anEmptySpace;

  i=[modelSwarm getRandomIntMin: 0 Max: [emptySpacesList getCount]];
  printf("  The value of i is %d \n", i);
  // Get an empty location from the list
  anEmptySpace=[emptySpacesList atOffset: i];
  x=[anEmptySpace getX];
  y=[anEmptySpace getY];
  [emptySpacesList remove: anEmptySpace];
  [anEmptySpace drop];

  return [self move: o toX: x Y: y];
}

First, a simple question.  Do I need to both remove the emptySpace from
the emptySpacesList and drop it? (this object will never exist again)

When I compile SchellingWorld, I am getting the following errors:

SchellingWorld.m: In function `_i_SchellingWorld__findEmptyLocation_':
SchellingWorld.m:64: warning: cannot find method.
SchellingWorld.m:64: warning: return type for `getRandomIntMin:Max:'
defaults to id
SchellingWorld.m:64: warning: assignment makes integer from pointer
without a cast

It will compile, but when it runs I get the following:

*** event raised for error: OffsetOutOfRange
*** function: indexAtOffset(), file:
/src/Swarm/swarm/src/collections/Collection.m, line: 73
*** execution terminating due to error

I have been using a method to setModelSwarm.  I am guessing that this is
why it doesn't find the method getRandomIntMin:Max.  I don't mind the
compile errors, but I have tried recasting that line by putting (int) in
various places and yet still get the errors.

So, my second question:  How do I fix this error and get the casting to go
alright?

My third question: Why does the offset go out of range?  I am picking a
number between 0 and the getCount for the list.

So I tried to fix this by using #import "ModelSwarm.h"

I got the following error:

In file included from Person.h:16,
                 from ModelSwarm.h:6,
                 from SchellingWorld.h:11,
                 from SchellingWorld.m:8:
Neighborhood.h:12: parse error before `SchellingWorld'
In file included from ModelSwarm.h:6,
                 from SchellingWorld.h:11,
                 from SchellingWorld.m:8:
Person.h:26: parse error before `SchellingWorld'
make: *** [SchellingWorld.o] Error 1
make: Target `all' not remade because of errors.


At Neighborhood.h: 12 is 
 SchellingWorld * myWorld;

Similarly at Person.h is
   SchellingWorld * myWorld;

So my fourth question is: why is this happening?


        Darren


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