You don't need to; just iterate over the array. Plus, if you want
a linked list, you just need a pointer to the head node, a method to
add new nodes, (possibly a method to remove nodes), and a method to
walk the list (probably using delegation to hand off the
responsibility of what happens each time a "node" is visited, that
way you can make a generic 'walk-the-list' method that you set up
with a delegate that takes the appropriate action on each node; say,
marking it's turn as finished, or whatever.)
If you try to do both, you're just going to get in trouble.
On Jul 27, 2008, at 1:33 AM, Mark Teagarden wrote:
Hi,
I'm working on a strategy game in which a NSMutableArray called
'army' contains a series of Unit objects. Each Unit contains a
property called next_unit, which is a pointer to the next unit in
the array - I'm implementing a linked-list so that units can be
moved sequentially.
Army starts off with six units, which are assigned one at a time to
the array:
for(i=0;i<6;i++){
u = [[Unit alloc] initWithPositionX:24+i Y:14-i];
[army addObject:u];
...
[u release];
}
Obviously when the first unit is added, there's nothing for
next_unit to point to, so I have to go back and do it on the next
loop iteration, which is where my problem arises:
if(i > 0) [army objectAtIndex:i-1].next_unit = [army lastObject];
Clearly, what I want to do is get the next-to-last unit in army and
point its next_unit pointer to the most recently added unit.
However, XCode she don't-a like this:
error: request for member 'next_unit' in something not a structure
or union
Is there a recommended way for accessing an ivar with synthesized
gettors/settors, that belongs to a returned object?
I hope I've explained my problem clearly enough. Thanks for an
advice you may offer.
Mark
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