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Member pointers (Solved)

Started by The C modest god Sep 25, 2006 at 2:13 AM 5 replies 850+ views

Original Post

The C modest god

112

The C modest god

Sep 25, 2006 at 2:13 AM

I am trying to do the following:


template <class T>
class Something {
   public:
       Somthing() { this->Ptr = Somthing<T>::Method; };
       T * (Somthing::*Ptr)();
       T var;
       T * Method() {return &this->var;};
       T * foo () 
{ 
return this->Ptr(); //<= Compilation error
};
}

But I get a compilation error that the term does not evaluate to a 0 variables function. How is it supposed to be done? Thanks in advance. [Edited by - The C modest god on September 25, 2006 2:59:14 AM]

michaweyel

Sep 25, 2006 at 2:22 AM

hmmmm...I'm not exactly sure what you are trying to do, but the reason why you get this error is probably because your class "something" doesn't have a function called Ptr(), which is what you are trying to call in the line where you get the error.

michaweyel

Sep 25, 2006 at 2:24 AM

oh, misread it...sorry, my bad.

The C modest god

Author

112

The C modest god

Sep 25, 2006 at 2:58 AM

Ok, My brother helped me, it should be:

(this->*Ptr)();

The C modest god

Author

112

The C modest god

Sep 25, 2006 at 6:44 AM

Quote:
Original post by Anonymous Poster
never again:

- post source code that isn't self-contained
- post source code that doesn't contain comments about what you are trying to do
- post source code that doesn't even compile due to TYPOS
- post source code that you didn't even verify before posting

The problem is that I don't program on this computer.
I hope you didnt try to run this code and it formatted your computer or somthing like this.

Emmanuel Deloget

431

Emmanuel Deloget

Sep 25, 2006 at 8:18 AM

@TCMG: since you try to play with pointers to members, you should read the corresponding section in the C++ FAQ Lite. Everything should be clearer then.

Quote:
Original post by Anonymous Poster
never again:

- post source code that isn't self-contained
- post source code that doesn't contain comments about what you are trying to do
- post source code that doesn't even compile due to TYPOS
- post source code that you didn't even verify before posting

This is pretty harsh. What about this one?

never again:

- assume that a user has access to a compiler on the machine he uses to browse gamedev
- use a tone that make the OP thinks that he broke some invisible rules in a way that will probably lead him to a painfull death
- require that the OP add comments to an obvious 12 line long piece of code (or point at lines that are not obvious and request explainations)
- post a "never again" list

This is not a "l33t xp3r7 0nlY" maling list, this is a public forum designed to be useful to beginners. The question of The C modest god is well formed (code, error, question about how it should be done (not a "do this for me" kind of question)), and as such cannot be dismissed like you did. This is rude.

If you don't understand the problem, post a question, not a set of what you think are the requirement to be allowed to post on gamedev.

Thanks for your patience,

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