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.pdf
But about the Number class I need to understand the context deeper before understanding completely! Yves -- View this message in context: http://forum.world.st/new-chapter-on-double-dispatch-for-new-book-tp4963645p4965510.html Sent from the Pharo Smalltalk Users mailing list archive at Nabble.com.
