const functions….

If the function is declared as const,the compiler treats the “this” as const pointer.So if you are calling a non const member function of the same class then all you need to do is to remove the constantness of ”this” pointer.The case for an embedded object of user defined type is pretty much straight forward.Below is an example,

Class CConstObj
{
 // dummy class
}

Class CConst
{
public:
    void Constfn()const;
    void NonConstfn(); 
    //…..
private:
    CConstObj m_oConstObj; 
 
}

void CConst::Constfn()const
{
    // Call a non const member function from the same class 
    ((CConstObj*)this)->NonConstfn();

    // Call non const member function of m_oConstObj ; 
    // m_oConstObj is a member of type CConstObj.
    ((CConstObj&)m_oConstObj).CallNonConstFn();
    ((CConstObj*)&m_oConstObj)->CallNonConstFn();
}

void CConst::NonConstfn()
{
   
}