Question

Consider:

  NSString*test2=[[NSString alloc]init];

test2=@"yo";
NSString *test= test2;
NSLog(@"test: %@ test2: %@",test, test2);
test2=@"what the?";
NSLog(@"test: %@ test2: %@",test, test2);

Output:

2012-11-14 09:50:26.720 testt[693:c07] test: yo test2: yo
2012-11-14 09:50:26.721 testt[693:c07] test: yo test2: what the?

How does one make test a true pointer, such that when test2 changes, so does test?

Answer 1

NSString *test2 is already a pointer. You’d want to make test pointer to a pointer (double *), and assign test2‘s address to it using & prefix then access the value using * prefix. I suck at explaining this so here is the code:

test2=@"yo";
NSString **test= &test2;
NSLog(@"test: %@ test2: %@", *test, test2);
test2=@"what the?";
NSLog(@"test: %@ test2: %@", *test, test2);