Re: warning missing

Thomas Hallgren wrote:

>
> Speaking in generic OO terms, using inheritance, you cannot remove
> attributes that are present in the generalisation. If B inherits A, an
> instance of B is per definition also an instance of A. Thus, you must alwasy
> be able to cast a B into an A. In short, If you don't want the OID, you
> cannot inherit a something that has an OID.

This is not completely true:

struct B
{
void foo();
};

class D : public B
{
private:
void foo();

public:
void bar();
};

as you can see a D "is a" B but the publich foo() doesn't
appartaint to D, at least an user of D could not use foo()

> Having said that, I think a warning is motivated. The warning should state
> that attributes (columns) present in the generalisation (the parent table)
> cannot be hidden.

Right.

Regards
Gaetano Mendola