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=0.2 required=5.0 tests=BAYES_00,INVALID_MSGID, REPLYTO_WITHOUT_TO_CC autolearn=no autolearn_force=no version=3.4.4 X-Google-Language: ENGLISH,ASCII-7-bit X-Google-Thread: fac41,b87849933931bc93 X-Google-Attributes: gidfac41,public X-Google-Thread: 1108a1,b87849933931bc93 X-Google-Attributes: gid1108a1,public X-Google-Thread: 109fba,b87849933931bc93 X-Google-Attributes: gid109fba,public X-Google-Thread: 114809,b87849933931bc93 X-Google-Attributes: gid114809,public X-Google-Thread: 103376,b87849933931bc93 X-Google-Attributes: gid103376,public X-Google-Thread: f43e6,b87849933931bc93 X-Google-Attributes: gidf43e6,public From: donh@syd.csa.com.au (Don Harrison) Subject: Re: OO, C++, and something much better! Date: 1997/01/13 Message-ID: #1/1 X-Deja-AN: 209485611 sender: news@syd.csa.com.au x-nntp-posting-host: dev50 references: organization: CSC Australia, Sydney reply-to: donh@syd.csa.com.au newsgroups: comp.lang.c++,comp.lang.smalltalk,comp.lang.eiffel,comp.lang.ada,comp.object,comp.software-eng Date: 1997-01-13T00:00:00+00:00 List-Id: Jon S Anthony writes: :> Yes. However, I'm not sure whether you lose some of the power of combining :> genericity with inheritance through Ada's module-type distinction. : :I have never seen any example supporting your "unease" - by you or :anyone else. Oh well. :> genericity in Ada is essentially module-based and inheritance is type-based, :> I suspect you may lose something here. : :Presumably you forgot to add "only" to "inheritance is type-based". No. :> No. Ada offers type casting in a couple of ways: :> :> 1) UNCHECKED_CONVERSION and :> 2) Address representation clauses (overlays). : :1. This is not "casting" 1) is; 2) isn't. But both violate safe typing. :2. It's irrelevant anyway as these are type system trap doors (outside : the type system). Yes. They're loopholes. :> For example, by using the value of a parent type where a subrange :> value is required. : :Give an example. Would like to. There's something wrong with the system here at the moment. If I get an example running, I'll send it to you. :This sort of thing will be statically checked. I agree it ought to be. Don. =-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=- Don Harrison donh@syd.csa.com.au