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Function pointers inside structs?

Started by gandolf1212 Dec 6, 2001 at 8:41 PM 1 reply 600+ views

Original Post

Dec 6, 2001 at 8:41 PM

Anyone know how you would do this?

struct Creature{
   char Name[10];

   Creature();
   void (*Rename)();
   void NameBob();
};

Creature Gabu;

Creature::Creature(){
   strcpy(Name, "Gabu");
   Gabu.Rename = &NameBob
   o<rint(){
   o<.

Btw, if you can''t figure out what it''s supposed to do (lol?) Rename should point to name bob to change the name to Bob.

Thanks alot for any help (or even unhelpful things that where meant to help =) ) Gandolf

dacrisxp

Dec 6, 2001 at 8:49 PM

Huh?

Shouldn''t you be calling it as
(*Gabu.Rename()); not Gabu.Rename(); ?

invective

Dec 7, 2001 at 2:34 AM

I would use a typedef to define your function pointers, since its easier to read and you can call your functions like myfunction () instead of (*myfunction)()


typdef void ( * function_ptr ) ( void );
function_ptr myfunction = somefunction;
myfunction ();

But to answer your question, pointers to NON STATIC MEMBER functions (class or structs) have an implicit this pointer as their first parameter (so they know what object invoked them). Because of this, you must qualify the function name with the class name.


typedef  returnType (ClassName::*memberPointerName)( parameters);

For more info, see here:
http://www.parashift.com/c++-faq-lite/pointers-to-members.html

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