interface M

[foggy]

How to implement such an interface?

Behind the interface, there is a class named M, that contains 5 classes (A,
B, C, D and E). On one situation, it will instantiate A and B, on other
situations, it will instantiate C, D and E.

To interface M, a class X object will instantiate an object of M and then
call member functions of M.

Any idea of implementing this in a good way will be deeply appreciated?
Thanks!

 

[Phlip]

How to implement such an interface?

Behind the interface, there is a class named M, that contains 5 classes (A,
B, C, D and E). On one situation, it will instantiate A and B, on other
situations, it will instantiate C, D and E.

To interface M, a class X object will instantiate an object of M and then
call member functions of M.

Any idea of implementing this in a good way will be deeply appreciated?
Thanks!

What do they do? What do their clients need them for?

 

[Daniel T.]

How to implement such an interface?

Behind the interface, there is a class named M, that contains 5 classes (A,
B, C, D and E). On one situation, it will instantiate A and B, on other
situations, it will instantiate C, D and E.

To interface M, a class X object will instantiate an object of M and then
call member functions of M.

Any idea of implementing this in a good way will be deeply appreciated?
Thanks!

To create an interface, you must know what the clients that use M need
from it. You do not need to know what creates objects that implement M,
or what objects that implement M usually contain. Focus on the clients
of M when creating the interface and it will likely be great.