something like java interface?

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 (cmk128@hotmail.com)

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

class B:public A{
};

int main(){
return 0;
}

re: something like java interface?

cmk128@hotmail.com wrote:[color=blue]
> 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()?[/color]

There is no need to. All classes that you derive from A will
automatically inherit all member functions of A.
[color=blue]
> class A{
> public:
> virtual void abc();
> };
>
> class B:public A{
> };
>
> int main(){
> return 0;
> }[/color]

hth
--
jb

(reply address in rot13, unscramble first)

re: something like java interface?

-----BEGIN PGP SIGNED MESSAGE-----
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Jakob Bieling wrote:[color=blue]
> cmk128@hotmail.com wrote:[color=green]
>> 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()?[/color]
>
> There is no need to. All classes that you derive from A will
> automatically inherit all member functions of A.
>[color=green]
>> class A{
>> public:
>> virtual void abc();
>> };
>>
>> class B:public A{
>> };
>>
>> int main(){
>> return 0;
>> }[/color]
>
> hth[/color]

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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