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7.8

Conflicting Interface

Asked by sindbad in C++ Programming Language

Hi,

1. Class A is an abstract base class
2. clas A has more than one pure virtual functions say
pv1() and pv2().
3. Class B and C are derived from Class A
4. Class B and C has their own implementations for pv1() and pv2() (B and C are ensured to be concrete classes).
5. Interface (signature and return type of the functions)of pv1() and pv2() are common across Class A, B and C.
6. Class B and Class C are instantiated.
7. Instances of B and C are referred through a pointer to class A.
8. Methods of instance B and instance C are invoked through the base pointer.
9. So far so good. Now, Class A has a pure virtual method say fn1().
10.This method have implementations in Class B and C.
11. However, the signature for implementations in Class B and Class C are different. Class B's implementation has 3 parameters and Class C implementation has no parameters.

12. If I make fn1() non virtual method only in B and C, I can't invoke through A*.

13. Since I know the type of the object instantiated, I can EXPLICTLY TYPE CAST A* into B* or C*. But this is not a good practice.

14. Alternativley, I thought of providing a pure virtual function fn1()in Class A with 3 parameters(with DEFAULT VALUES ).

Class B and C will override fn1() and provide PROPER implementation.

Idea is while invoking the method fn1() on instance of B pass the 3 parameters. While invoking fn1() through instance of C, invoke without any parameters.

But, this too, looks like not proper OO Design.

Help me.

Thanks,

Sindbad

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Conflicting Interface

Asked by sindbad in C++ Programming Language

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