Graphics Programs Reference
In-Depth Information
Pointer Variables and Object Ownership
Pointer variables convey
ownership
of the objects that they point to.
• When a method (or function) has a local variable that points to an object, that
method is said to
own
the object being pointed to.
• When an object has an instance variable that points to another object, the object
with the pointer is said to
own
the object being pointed to.
Think back to your
RandomPossessions
application as a whole. Or, better yet, reopen
RandomPossessions.xcodeproj
and have another look at the code in
main.m
. In
this application, an instance of
NSMutableArray
is created in the
main
function, and
then 10
BNRItem
instances are added to the array.
Figure 3.3
shows the objects in
RandomPossessions
and the pointers that reference them.
Figure 3.3 Objects and pointers in RandomPossessions
