iOS You own it, you release it

[teguh123]

Does that mean that the alloc and release will always be on the same function (with the exception of destructor?)

 

[Small White Car]

I don't see how anyone could think otherwise!

 

[drummr]

Yes!....wait....No!.....wait......what?😕

 

[vincenz]

Yes!....wait....No!.....wait......what?😕

I'm just as confused by you by this post 😕

 

[blevins321]

yes. I've never seen the allocator and release in different functions. I always make a separate destructor though.

 

[huskerchad]

No, alloc and release do not always occur in the same function. For example, one object creates another object (and stores a pointer to it) at init time...then at dealloc time, releases it. Very common.

 

[Savage]

I'm just as confused by you by this post 😕

Actually, your post is the most confusing post in this thread...

 

[seepel]

No, alloc and release do not always occur in the same function. For example, one object creates another object (and stores a pointer to it) at init time...then at dealloc time, releases it. Very common.

To elaborate on this, imagine that you have an object of class Car that needs to access another object of class Wheel for Car's entire life span. You would want to create the Wheel when you create the Car, retain it. And then you release the Wheel when dealloc is called on the Car. Here would be init and dealloc for Class Car.

@interface Car : NSObject {
    Wheel *wheel_;
}

@end


@implementation Car

- (id)init {
    if((self = [super init])) {
        wheel_ = [[Wheel alloc] init];
    }
    return self;
}

- (void)dealloc {
    [wheel_ release];
    [super dealloc];
}

@end

 

[admanimal]

An additional release that could go along with seepel's example would be in the setter method:

- (void)setWheel(Wheel *aWheel) {
      if(aWheel != wheel_) {
         [wheel_ release];
         wheel_ = [aWheel retain];
      }
}

This is what the compiler generates for you if you synthesize a retained property.

 

[teguh123]

So with the exception of init and dealloc couple, alloc and release are always on the same function.

admanimal sample actually illustrate it. Retain is like alloc in a sense of increasing retain count.