objective c - Will this hold self inside a block? -

ok, code on arc holds self inside block:

dispatch_async(someq, ^{     [self dosomething]; }); 

and can solved by

__weak myrequest *weakself = self; dispatch_async(someq, ^{     [weakself dosomething]; }); 

but if dosomething has lot of references self? because dosomething code run inside block isn't same of code of dosomething on block directly?

do need pass weakself dosomething method can use weakself references instead of self? like

__weak myrequest *weakself = self; dispatch_async(someq, ^{     [weakself dosomethingusingthisself:weakself]; }); 

by doing:

myrequest *__weak weakself = self; dispatch_async(someq, ^{     [weakself dosomething]; }); 

...when there no more references self, weakself automatically becomes nil. async callback end sending dosomething nil in object destroyed before callback, nothing.

if weakself not nil, it's pointer object. when send selector object, there 2 implicit arguments: self , _cmd (see documentation imp), section 6.1). weakself becomes implicit self in calls. @ point, self strong reference, object won't destroyed out underneath during dosomething call chain, referencing self dosomething doesn't cause reference count increment because block doesn't know goes on inside of dosomething.