Self-Similar

Q It is quite possible to invoke member functions through a NULL "this" pointer. As long as the member function is non-virtual, and no member variables are being accessed, the following code works:

void Class::Function() {
	if (!this) return; // good idea or not?
}

Even if all the conditions listed above are met, can this code fail?

A The code can fail! Consider the following example:

class Derived : public Base, public Class {
};
Derived *d=0;
d->Function();

In this particular case, the "this" adjustment doesn't check for NULL, so "this" will be equal to sizeof(Base), which is both non-NULL and invalid.