Howto declare a function pointer to a method in a class?

[Francois Grieu]

Hello,

I'm trying to define a type suitable for a pointer to one
of several member functions of my class cBar (all functions
have the same interface, say accept an int and return void).


For now, I'm making a type tHandler suitable for a pointer
to a global function accepting an additional parameter "me",
holding a pointer to my class:


typedef void(*tHandler)(class cBar *const me, int val);

void Handler0(class cBar *const me, int val);
void Handler1(class cBar *const me, int val);

class cBar {
tHandler fCurrentHandler;
/*..*/
public:
inline void cBar::CurrentHandler(int val)
{
(*fCurrentHandler)(this,val);
}
inline cBar()
{
fCurrentHandler = Handler0;
CurrentHandler(0);
}
inline ~cBar()
{
CurrentHandler(-1);
}
};


This works, but is ugly; in particular Handler0/Handler1 should
be private methods of cBar, and tHandler a private type.

Any idea ?

TIA,
Francois Grieu


Note: this is not homework, I'm moving to C++ from an embedded C
background.

 

[Victor Bazarov]

I'm trying to define a type suitable for a pointer to one
of several member functions of my class cBar (all functions
have the same interface, say accept an int and return void).

Does this not work

typedef void (cBar::*tHandler)(int);

for some reason? What book on C++ are you reading that doesn't explain
pointers to member functions?

[..]

V

 

[Francois Grieu]

Does this not work

typedef void (cBar::*tHandler)(int);

for some reason?

Yes that's it!

What book on C++ are you reading that doesn't explain
pointers to member functions?

C++ For Mathematicians - An Introduction.. by Edward Scheinerman.

Many thanks.

Francois Grieu

 

[Christopher]

You can also check out boost::function and boost::bind

 

[Victor Bazarov]

Yes that's it!


C++ For Mathematicians - An Introduction.. by Edward Scheinerman.

Get something that has more C++ in it. There are many decent books that
go into enough depth on C++ to be recommended by www.ACCU.org (see their
book section).

V

 

[Krice]

This works, but is ugly;

It's ugly, because it's not C++. Learn more about C++, should do
the trick.

Note: this is not homework, I'm moving to C++ from an embedded C
background.

I can see that.