A question about inheritance

[vineoff]

First, think I'm having an abstract class

class C { public: virtual void f(); };

What is the difference between these two ways:

class D : public C { ... }
and
class D : public virtual C { ... }

I've tried to search from google with no luck. Examples are always in
first form, without keyword 'virtual' in inheritance list.

Is this too complicated to explain here?

Thanks in advance.

~ vineoff

 

[TIT]

vineoff sade:

First, think I'm having an abstract class

class C { public: virtual void f(); };

What is the difference between these two ways:

class D : public C { ... }
and
class D : public virtual C { ... }

I've tried to search from google with no luck. Examples are always in
first form, without keyword 'virtual' in inheritance list.

Have you tried googling for "virtual inheritance"?
I get several direct results on the topic, including:

http://www.parashift.com/c++-faq-lite/multiple-inheritance.html

TIT

 

[Victor Bazarov]

First, think I'm having an abstract class

class C { public: virtual void f(); };

No, you're having a brain-o. This is not an abstract class.

What is the difference between these two ways:

class D : public C { ... }
and
class D : public virtual C { ... }

For 'D', none.

I've tried to search from google with no luck. Examples are always in
first form, without keyword 'virtual' in inheritance list.

Is this too complicated to explain here?

No, but your book can do it better. What book are you reading that
does not explain virtual inheritance?

V

 

[vineoff]

Okay, thank you all, searched for that virtual inheritance and found an
answer.

 

[vineoff]

Sorry, meant 'virtual void f() = 0;'.