Re: Dynamic message typing problem

FROM : Bill Bumgarner
DATE : Sat May 17 01:58:20 2008

On May 16, 2008, at 4:51 PM, Julius Guzy wrote:
> Thanks to all who replied to my pleas for help.
> I took Bill and Scott's suggestions to heart and produced the answer 
> I needed: Dynamic Typing which allows me to avoid circularity etc.


Good.  BTW:  Nice paintings.

> I post the complete solution as an example and to check that I'm not 
> running close to the wind by using a dummy class definition. The 
> code gets no compiler warnings.


You don't need the dummy class.

I'd do it something like this (Mail Code -- this probably won't 
compile).

Only I'd also pull out all of the #imports and move to using a shared 
precomp for the project...

//  AnonTargetClass.h
#import <Cocoa/Cocoa.h>
@interface AnonTargetClass : NSObject {
}
- (void) printFloat:(float)pF;

//  AnonTargetClass.m
#import "AnonTargetClass.h"
@implementation AnonTargetClass
- (void) printFloat:(float)pF {
   NSLog(@"%7.3f",pF);
}

//  CallingClass.h
#import <Cocoa/Cocoa.h>

@class AnonTargetClass;
@interface CallingClass : NSObject {
}
- (void) callPrintConstFloat:(AnonTargetClass *)pId;
- (void) callPrint:(id)pId zFloat:(float)pF;

//  CallingClass.m
#import "CallingClass.h"
#import "AnonTargetClass.h"
@implementation CallingClass
- (void) callPrintConstFloat:(AnonTargetClass *)pId {
   [pId printFloat:99.99];
}
- (void) callPrint:(id)pId zFloat:(float)pF {
   [pId printFloat:pF];
}

//  main.m
#import <Cocoa/Cocoa.h>
#import "AnonTargetClass.h"
#import "CallingClass.h"

int main(int argc, char *argv[])
{
   AnonTargetClass     * atcObj        = [[AnonTargetClass alloc]init];
   CallingClass            * callingObj    = [[CallingClass alloc]init];
   
   [callingObj callPrintConstFloat:atcObj];    
   [atcObj printFloat:88.88];
}