Call a non-const member function from a const member function

Question

I would like to know if its possible to call a non-const member function from a const member function. In the example below First gives a compiler error. I understand why it

Answer 1

The restriction of const member methods are came from compile time. If you can fool the compiler, then yes.

class CFoo
{ 
public:
    CFoo() {m_Foo = this;}
    void tee();

    void bar() const 
    { 
        m_Foo->m_val++;  // fine 
        m_Foo->tee();    // fine
    }
private:
   CFoo * m_Foo;
   int    m_Val;  

};

This actually abolishes the purpose of const member function, so it is better not to do it when design a new class. It is no harm to know that there is a way to do it,especially it can be used as an work-around on these old class that was not well designed on the concept of const member function.