Objective-C ref count and autorelease
- by turbovince
Hey guys, suppose the following code:
int main (int argc, const char * argv[])
{
//[...]
Rectangle* myRect = [[Rectangle alloc] init];
Vector2* newOrigin = [[[Vector2 alloc] init] autorelease]; // ref count 1
[newOrigin setX: 50.0f];
[myRect setOrigin: newOrigin]; // ref count 2
[myRect.origin setXY: 25.0f :100.0f]; // ref count goes to 3... why ?
[myRect release];
[pool drain];
return 0;
}
Rectangle's origin is declared as a (retain) synthesized property.
Just wondering 2 things:
Why does ref count goes to 3 when using the getter accessor of Rectangle's origin? Am I doing something wrong ?
With a ref count of 3, I don't understand how this snippet of code cannot leak. Calling release on myRect will make it go down to 2 since I call release on the origin in dealloc(). But then, when does autorelease take effect?
Thanks!
