something like java interface?

[cmk128]

Hi
How can we force all the class A's subclass inherit all its
functions? Or how can we force class B to inherit function abc()?
thanks
from Peter (cm****@hotmail.com)

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

class B:public A{
};

int main(){
return 0;
}

[Jakob Bieling]

cm****@hotmail.com wrote:

Hi
How can we force all the class A's subclass inherit all its
functions? Or how can we force class B to inherit function abc()?
There is no need to. All classes that you derive from A will
automatically inherit all member functions of A.
class A{
public:
virtual void abc();
};

class B:public A{
};

int main(){
return 0;
}

hth
--
jb

(reply address in rot13, unscramble first)

[Thomas Maier-Komor]

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Jakob Bieling wrote:

cm****@hotmail.com wrote:

Hi
How can we force all the class A's subclass inherit all its
functions? Or how can we force class B to inherit function abc()?

There is no need to. All classes that you derive from A will
automatically inherit all member functions of A.

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

class B:public A{
};

int main(){
return 0;
}

hth

to force the implementor of the deriving class to do his own
implementation, add a "= 0" to the declaration of the method.

I.e.:

class A {
public:
virtual void abc() = 0;
};

HTH,
Tom
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