Re: Is there anyway I can use a static function contained in a class from an object.

From:

Paavo Helde <myfirstname@osa.pri.ee>

Newsgroups:

comp.lang.c++

Date:

Thu, 15 Oct 2009 13:18:00 -0500

Message-ID:

<Xns9CA5D8AD19C5Dpaavo256@216.196.109.131>

Jim <ja@astro.livjm.ac.uk> wrote in news:a3603a21-4167-42c0-9028-
6e6e27601dde@c3g2000yqd.googlegroups.com:

Hi,
I'm passing an object to another type of object, and would like it to
have access to a public static function contained in the original
object's class, is that possible? I have two types of object each
derived from a base class, each with their own static function of the
same name.

This could possibly be achieved more simply overloading static
variables, I think, but I don't know if that's possible.

Probably you want something like virtual static functions? These are not
supported in C++, but can be emulated quite easily via normal virtual
functions:

class Base {
public:
     virtual void f() = 0;
};

class A: public Base {
public:
     static void static_f() {}
     virtual void f() {static_f();} // calls A::static_f()
};

class B: public Base {
public:
     static void static_f() {}
     virtual void f() {static_f();} // calls B::static_f()

};

void Another_function(Base& obj) {

     obj.f(); // calls A::static_f() or B::static_f() depending on the
object type

}

hth
Paavo