Re: [Swarm-Support] What is the best way to model "lists" of integersin Obj-C?

[Paul Johnson]

Luke Premo wrote:
> Hello,
> I would like to use "lists" of (negative and positive) integers in my  
> Obj-C model (Mac OSX, Swarm 2.2) to represent simple genomes.  So far,  
> I've used the List object to do this, but i get some strange results  
> (i.e., getCount returns 10 but when I print out the contents of the  
> "haplotype" I don't always get 10 integers...sometimes i get none) not  
> to mention the following compiler warning: Hominin.m:38: warning:  
> passing argument 1 of 'addLast:' makes pointer from integer without a  
> cast.  I get the feeling List is only reliable for objects and not  
> integers, is this true?  And if so, what would be a better choice for  
> me given that i want to be able to add/remove integers with offsets  
> and use the addLast/First and removeLast/First commands when modeling  
> recombination between two "lists" of integers?  Should I switch to  
> Arrays, Collections, or Strings to do this?
>   
All containers accept objects, not integers.  Create an Integer class, 
and then set values into those objects, and add them to lists.

I'm attaching a class I've used in the past for integers.

> If my hunch is wrong, and Lists can deal with integers just fine, then  
> how come I can't get all 10 of the integers to print out for me using  
> a while loop on an index of the haplotype List and the printf  
> function?  I'm stumped.
>
> I'm sure this is a simple problem, but I've been unsuccessful in  
> finding a definitive answer after searching for the last couple of  
> hours.  I would greatly appreciate any suggestions.  Thank you very  
> much for you time,
>
> Luke Premo
>
>
>
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--
Paul E. Johnson                       email: address@hidden
Dept. of Political Science            http://pj.freefaculty.org
1541 Lilac Lane, Rm 504                              
University of Kansas                  Office: (785) 864-9086
Lawrence, Kansas 66044-3177           FAX: (785) 864-5700

#import <objectbase/SwarmObject.h>

//A small wrapper class to hold integers so we can insert them into
//swarm lists


#define SWARMINTEGER(value) \
  [[[SwarmInteger createBegin: [self getZone]] setVal: value] createEnd]


@interface SwarmInteger: SwarmObject
{
  int value;
}
- setVal: (int)theValue;
- (int)getVal;
@end

#import "SwarmInteger.h"

@implementation SwarmInteger
{
  int value;
}


- setVal: (int)theValue
{
  value = theValue;
  return self;
}
- (int)getVal
{
  return value;
}
@end