Just messing around

poly2.m

/*

Protocols behave like interfaces in Java. You don't inherit implementation
but its a way to ensure that certain classes/objects do implement the
enforced methods

*/


#import <Foundation/Foundation.h>

@protocol Printing
-(void) print;
-(void) clean;
@end

@protocol Faxing
-(void) print;
-(void) fax;
@end

@interface Multi : NSObject <Printing, Faxing> {

}
@end

@implementation Multi

-(void) print {

}
-(void) fax {

}

-(void) clean {

}

@end

/////////////////////////////////////////////////

int main() {

	NSAutoreleasePool * pool = [[NSAutoreleasePool alloc] init];

	Multi * multi = [[[Multi alloc] init ] autorelease];
	[multi print];
	[multi fax];

	/*
	
		Here, we declare the what variable as type id, but that it
		needs to conform the Printing protocol. Well, the actual object
		is a Multi type, which of course conforms to the protocol Printing
		among other things.

	*/
	id <Printing> what = [[[Multi alloc] init] autorelease];
	[what print];

	[pool drain];
	return 0;

}