Scope of variables passed to function handles?
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Hi, everyone,
I want to ask about the non-input variables in function handles.
For example, following code returns h(1)=2.
b=1;
h=@(a)a+b;
clear b;
display(sprintf('h(1)=%d', h(1)));
Is this kind of usage safe and correct?
Dehuan
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matt dash
2014-12-16
1 个投票
As far as i know, yes this is safe and correct. Any non-input variables pass their values to the function at the time the function handle was created. Subsequent changes to or clearing of those variables has no effect on the function.
2 个评论
Adam
2014-12-16
Yes, this is correct. It is also why passing the handles structure, for example, in a GUIDE-based file to a callback is not a good idea, because a copy of the structure at the exact time the callback is set is hard-coded into the callback, irrespective of when it is called.
Dehuan
2014-12-16
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