From mboxrd@z Thu Jan 1 00:00:00 1970 X-Spam-Checker-Version: SpamAssassin 3.4.4 (2020-01-24) on polar.synack.me X-Spam-Level: X-Spam-Status: No, score=0.6 required=5.0 tests=BAYES_20,INVALID_MSGID autolearn=no autolearn_force=no version=3.4.4 X-Google-Language: ENGLISH,ASCII-7-bit X-Google-Thread: f43e6,9a0ff0bffdf63657 X-Google-Attributes: gidf43e6,public X-Google-Thread: 103376,4b06f8f15f01a568 X-Google-Attributes: gid103376,public X-Google-Thread: fac41,9a0ff0bffdf63657 X-Google-Attributes: gidfac41,public X-Google-Thread: 1108a1,9a0ff0bffdf63657 X-Google-Attributes: gid1108a1,public From: "Robert Martin" Subject: Re: Software landmines (loops) Date: 1998/09/02 Message-ID: <6skcve$t6j$1@hirame.wwa.com>#1/1 X-Deja-AN: 387262615 References: <35f51e53.48044143@ X-MimeOLE: Produced By Microsoft MimeOLE V4.72.2106.4 Organization: WorldWide Access - Midwestern Internet Services - www.wwa.com Newsgroups: comp.lang.eiffel,comp.object,comp.software-eng,comp.lang.ada Date: 1998-09-02T00:00:00+00:00 List-Id: Patrick Doyle wrote in message ... >In article <6sjms6$7c4$1@hirame.wwa.com>, >Robert Martin wrote: >> >>1. They are indeterminate. When you throw an exception, you have no idea >>where control will wind up. It is not simply an exit from the current >>scope, or even from the current function. > >By this logic, polymorphism is indeterminate too. When you call a >polymorphic function, you have no idea where control will >wind up. This is a Good Thing. It's what makes polymorphism >powerful: the fact that you're giving someone else some control >over the situation makes your code flexible. Granted. >The same holds for exceptions. But there is a difference. With polymorphism, though you may not know what function is actually being called, you do know that it will return to you. Thus, there is a postcondition that you can depend upon. But once you throw an exception, there is very little you can say about what happens next. Robert C. Martin | Design Consulting | Training courses offered: Object Mentor | rmartin@oma.com | Object Oriented Design 14619 N Somerset Cr | Tel: (800) 338-6716 | C++ Green Oaks IL 60048 | Fax: (847) 918-1023 | http://www.oma.com "One of the great commandments of science is: 'Mistrust arguments from authority.'" -- Carl Sagan