Not through virtual funtions... if you made the function non-virtual, and didn''t override them, you could have them all ignore thier this pointer, and deference a static this pointer that''s part of the singleton class... not recommended.

What are you trying to accomplish?

quote:Original post by EvilCrap

i would like to have a singleton base class with virtual functions that can be overridden, however, child classes create their own instances of the (static) singleton....

Creating multiple instances of a singleton makes no sense.

A singleton a class that you can never instantiate more than once in the entire program, plus that instance lasts for the entire program. It is intended to represent things such as a program object.

If you derive classes from a singleton base class, you can only ever have one instance of a derived class or one instance of the base class, since instantiating a derive class also instantiates the base class.

If all you want is to prevent the base class from being instantiated by itself, then forget about singletons and just make the virtual functions pure virtual. Or make the constructors, destructors, and copy functions protected.

Good Luck!

Edited by - null_pointer on February 16, 2002 2:06:14 PM