Path: csiph.com!eternal-september.org!reader02.eternal-september.org!.POSTED!not-for-mail
From: Tim Rentsch <tr.17687@z991.linuxsc.com>
Newsgroups: comp.lang.c++
Subject: Re: dynamic_cast
Date: Sat, 07 Aug 2021 13:06:58 -0700
Organization: A noiseless patient Spider
Lines: 17
Message-ID: <86eeb52f4t.fsf@linuxsc.com>
References: <20210627225136.00005d66@reddwarf.jmc> <sbbr3u$a3j$1@dont-email.me> <sbl7mh$kb5$1@dont-email.me> <sbpm58$tfv$1@dont-email.me> <oMZDI.15364$SA.31@fx39.iad> <sbpq4k$ql6$1@dont-email.me> <j3_DI.7823$en4.873@fx34.iad> <sbpu3o$pkd$1@dont-email.me> <Uz%DI.3582$uM6.29@fx21.iad>
Mime-Version: 1.0
Content-Type: text/plain; charset=us-ascii
Injection-Info: reader02.eternal-september.org; posting-host="0a1d8104bbc0e7f8706fc1dabce7c8e9"; logging-data="18105"; mail-complaints-to="abuse@eternal-september.org";	posting-account="U2FsdGVkX1+8CLf5g/3RnFSFosjv3WQM0kp9zorE3qU="
User-Agent: Gnus/5.11 (Gnus v5.11) Emacs/22.4 (gnu/linux)
Cancel-Lock: sha1:/MpQ1OWLqafZ6RtSQ3pUcxMYc8A= sha1:vwx4HLg6str+9Qam8qy1Yzp9oAw=
Xref: csiph.com comp.lang.c++:80792

Richard Damon <Richard@Damon-Family.org> writes:

> On 7/3/21 11:01 AM, Bonita Montero wrote:
>
>>>> If you're doing a dynamic_cast you're switching upon the type of the
>>>> class.  This switching should be better done inside the class with class
>>>> -dependent code - with a virtual function call.
>>>
>>> Wrong.  Application level logic should stay in the application level
>>> code.  That is the only scalable option.
>>
>> Virtual function calls are more scalable.
>
> Wrong, the NUMBER of functions needed grows way to fast to be scalable.

It might, but it doesn't have to.  The number of functions
needed depends on the class hierarchy.