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From: jonas@falcon.ericsson.se (Jonas Nygren)
Newsgroups: comp.lang.c++
Subject: Re: asking an object for its type
Message-ID: <1991Feb21.095308.5371@ericsson.se>
Date: 21 Feb 91 09:53:08 GMT
References: <23984@netcom.COM> <1190@sheol.UUCP> <1991Feb19.000449.22255@gpu.utcs.utoronto.ca>
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In article <1991Feb19.000449.22255@gpu.utcs.utoronto.ca> craig@gpu.utcs.utoronto.ca (Craig Hubley) writes:
>In article <1190@sheol.UUCP> throopw@sheol.UUCP (Wayne Throop) writes:
>>> aed@netcom.COM (Andrew Davidson) 
>>> I have some processing that only applies for certain types of objects. 
>>> If an object is not of the correct type I want to do some error stuff. 
>>> The problem is how do I fiqure out what the type of the object is. 

Simula have dynamic typechecking and also an operator 'in' which
could be used to achieve exactly what you want.

In the C++ world I believe that the NIH library do type all objects
and this mechanism would probably also solve your problem. The 
mechanism in NIH is a bit akward to use (my personal opinion) but 
you do not have to invent your own scheme. (I do not know were
you can find NIH).

/Jonas