Yes I know this article. For the book I was trying to get an example that I can just add as an extension of a previous exercise. And I like it. On Tue, Aug 29, 2017 at 9:33 PM, Yves Lenfant <lenfantyv@wanadoo.fr> wrote:
I start understanding better, I found this topic in the SmalltalkWithStyle book p. 107 This technic was explained by Dan Ingalls in [Ingalls 86] Ingalls, D. A Simple Technique for Handling Multiple Polymorphism. 347-349, Proceedings of OOPSLA '86, Portland, Or., ACM SIGPLAN 21(11). 1986 That you can find here: https://pdfs.semanticscholar.org/4924/ecc75d2a30120a088740c53594065cae67ee.p...
But about the Number class I need to understand the context deeper before understanding completely!
Yves
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