topimaurola wrote:
> Hi,
>
> the following code doesn't compile on Gnu g++ (4.2.4)
>
> Any ideas why?
>
> the marked "POINT 1" below, is member function of derived
> class. It should have access right to c0.
>
> Topi
>
> *******
>
>
> class c1a;
> class c1b;
>
> class c0
> {
> friend class c1a;
> protected:
> int prot;
> private:
> int priv;
> public:
> int pub;
> void mf0()
> {
> c0 *k=this;
> k->pub;
> k->prot;
> k->priv;
> }
> };
>
> class c1b:public c0
> {
> public:
> void mf1(void)
> {
> c0 *k=this;
> k->pub;
> k->prot; // POINT 1. this point doesn't compile.
> k->priv; // POINT 2. this is ok not to compile, no friend.
> }
> };
Of course that won't work. You can only modify protected members of the
derived class. Compilers aren't smart enough to track across pointer
assignments. Maybe you meant this instead:
class c1b:public c0
{
public:
void mf1(void)
{
pub;
prot;
priv;
}
};
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