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I am dealing with function pointers to classes member functions
and they are being set as callbacks etc.
Then, been invoked.
My question is I think it is a good idea to check the function
pointers whether they have been set to NULL etc.? right?
e.g., maybe before invoking them etc.??

Posted 27-Feb-13 20:05pm
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Solution 2

It is always a good idea to do some research before asking a question. There were a couple of questions about member functions pointers in last few days and any of those answers would have been valuable for you.

Regarding a Zero check on pointers: The following sentence is so trivial that I am almost afraid to give that as an advice: It never hurts to check, but is also never a guarantee that a pointer is valid otherwise. You should make sure by other means (correct initialization) that your pointers (data pointer or member function pointers alike) have a valid value.

Of course, you can use the zero-value is indication that the member function pointer is not valid at the time, for example because no callback has been specified so far.
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Solution 1

It is always a good idea to check before you invoke a call.

You can insert assert to check on debug time to make sure that function is not empty

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