Parser2 considered harmful

Miles Sabin msabin at
Tue May 18 13:01:39 BST 1999

John Cowan wrote,
> If they do inherit, then you have the problem that 
> Parser may be extended in several logically distinct 
> ways, leading to interfaces Parser2A and Parser2B.  
> The next generation will have to specify Parser3A, B, 
> and C all inheriting from Parser2A *and* Parser2B, 
> which causes a messy diamond-shaped inheritance graph.

It's not diamond inheritance per-se which is the
problem, it's (as you point out) the potential for a
combinatorial explosion of derived interfaces which is



Miles Sabin                          Cromwell Media
Internet Systems Architect           5/6 Glenthorne Mews
+44 (0)181 410 2230                  London, W6 0LJ
msabin at           England

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