How can this code compile?

Question

    const UIView * vLocalBottomButton = self.BottomButton;

    vLocalBottomButton =nil;

Basically I want to pass on self.BottomButton to a method that will run at outside the main thread. When the view is used, it'll be done at the main thread.

I just need to ensure that the view doesn't change. That's all. So I put it to a local variable and then pass that local variable to ensure that vLocalBottomButton didn't change.

score 3 · Answer 1 · answered Jun 17 '14 at 09:01

3

You should create constant pointer. In your case:

UIView * const vLocalBottomButton = self.BottomButton;

//this won't compile therefore

vLocalBottomButton =nil;

answered Jun 17 '14 at 09:01

Alexander Tkachenko

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Why the pointer is not const? How do you explain this grammar rules? – user4951 Jun 17 '14 at 09:19
Understand the difference between constant value and constant pointer in C. http://stackoverflow.com/questions/10091825/constant-pointer-vs-pointer-on-a-constant-value – Alexander Tkachenko Jun 17 '14 at 09:26

How can this code compile?

1 Answers1