--- Comment #1 from david <>  2009-07-02 01:19:48 PDT ---
why not create something like IUnknown?
e.g. IRange

all classes inherited from IRange get the tag of being a range class.

This is less hackish of testting funcs.

IRange can enforces users to provide those funcs. 
If there're some problems for optimization, IRange can still be an empty
interface for hinting the compiler or treated specially.

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