Multiple weak call

gistfile1.txt

Wrong:
__weak id obj;
dispatch_async(queue, ^() {
[obj doSomething];
[obj doSomethingElse]; <- can turn to nil at any point, should store in strong at beggining of block
[obj doSomethingElse2];
});

Ok:
__weak id obj;
dispatch_async(queue, ^() {
[obj doSomethingAbstract];<- either everything or nothing will execute, no need for strong storage
});

- (void)doSomethingAbstract
{
[self doSomething];
[self doSomethingElse];
[self doSomethingElse2];
}