shared base object

[pramod]

Is it possible to realize shared base object (without resorting to
static)?
What i mean is a different base objects (of same type), each of which
can be shared across multiple derived classes (objects) in inheritance
hierarchy ?

This is like decorator, but at data level (not interface).

Does any language support such feature ?

regards,
Pramod

 

[Victor Bazarov]

Is it possible to realize shared base object (without resorting to
static)?
What i mean is a different base objects (of same type), each of which
can be shared across multiple derived classes (objects) in inheritance
hierarchy ?

This is like decorator, but at data level (not interface).

Does any language support such feature ?

It's an artificial singleton (well, not really, it's a counted or
registered object) model. The base class has to maintain some kind
of collection of shared objects and the derived class objects should
request an object from the base and get it (as shared).

There is no direct support for that in C++, but it is possible to
code such a model.

Victor

 

[Jeff Schwab]

Is it possible to realize shared base object (without resorting to
static)?
What i mean is a different base objects (of same type), each of which
can be shared across multiple derived classes (objects) in inheritance
hierarchy ?

This is like decorator, but at data level (not interface).

Does any language support such feature ?

regards,
Pramod

You mean like virtual inheritance?