passing virtual member function to templates

[g3rc4n]

is it possible to do something like this

template<class T, class FUN>
void foo(T& t, const FUN& f){
f(t);
}
template<class T, class FUN>
void fooo(T& t, const FUN& f){
t->f();
}
struct base{
virtual ~base(){}
virtual void say()=0;
};
struct dir : public base{
void say(){
std::cout << "hi" << std::endl;
}
};
void bar(){
base* ptr = new dir;
foo(ptr,std::mem_fun(base::say));
delete ptr;
}

or are virtual functons something that templates can't handle?

 

[g3rc4n]

thanks got it sussed

template<class T, class FUN>
void foo(T& t, FUN f){
(*t.*f)();
}
struct base{
virtual ~base(){}
virtual void say()=0;
};
struct dir : public base{
void say(){
std::cout << "hi" << std::endl;
}
};
void bar(){
base* ptr = new dir;
foo(ptr,&base::say);
}


g++ doesn't like FUN& because it doesn't like base::*&

 

[g3rc4n]

Why is 't' a reference?  You could just drop the '&' altogether, no?
The code in the function requires 't' to be a dereferenceable entity
(like a pointer or an iterator).

because i want to do an operation on t i don't want to do an operation
on a new object, thats the whole point of member functions you noob