18.1

[mdeh]

Code: (Objective-C)

#import <Foundation/NSObject.h>
#import <Foundation/NSArray.h>
#import <Foundation/NSString.h>
#import <Foundation/NSAutoreleasePool.h>

int main (int argc, const char * argv[]) {
    NSAutoreleasePool	* pool = [[NSAutoreleasePool alloc] init];
	NSMutableArray		*dataArray = [NSMutableArray arrayWithObjects:@"one", @"two", @"three", @"four", nil];
	NSMutableArray		*dataArray2;
	
	// simple  assignment
	
	dataArray2 = dataArray;
	[dataArray2 removeObjectAtIndex: 0];
	NSLog(@"dataArray:  ");
	for (NSString *elem in dataArray)
		NSLog(@"    %@", elem);
	
	
	NSLog(@"dataArray2:  ");
	for (NSString *elem in dataArray2)
		NSLog(@"    %@", elem);
	
	// try a copy, then remove the first element of the copy
	
	dataArray2 = [dataArray mutableCopy];
	[dataArray2 removeObjectAtIndex: 0];
	
	NSLog(@"dataArray:  ");
	for (NSString *elem in dataArray)
		NSLog(@"    %@", elem);
	
	
	NSLog(@"dataArray2:  ");
	for (NSString *elem in dataArray2)
		NSLog(@"    %@", elem);
	
	[dataArray2 release];
    
    [pool drain];
    return 0;
}