Andrew J Robb wrote:

> class A
> {
> public:
>   virtual void fred();
> };
>
> class B : public A
> {
> public:
>   void fred();
> };
>
> The above example is an obscure way of declaring that B::fred() is virtual.
> And may be changed in B by changing A::fred() from being virtual. This is
> not clear.
>
> Please, consider making "virtual" mandatory in derived classes if a method
> is already virtual in a base class.

class A
{
public:
  virtual void fred();
};

class B : public A
{
public:
  virtual void fred();
};

The above is an obscure way of declaring that B::fred() overrides
A::fred(). And may be changed to mean that B::fred() is a new virtual
function by changing A::fred() from being virtual. This is not clear.

Please, consider making "virtual" disallowed in derived classes if a
method is already virtual in a base class.

--

Valentin Bonnard

---
[ comp.std.c++ is moderated.  To submit articles, try just posting with ]
[ your news-reader.  If that fails, use mailto:std-c++@ncar.ucar.edu    ]
[              --- Please see the FAQ before posting. ---               ]
[ FAQ: http://www.research.att.com/~austern/csc/faq.html                ]
[ Note that the FAQ URL has changed!  Please update your bookmarks.     ]