NetNews Usenet Archive 1992 #27/NN_1992_27.iso/spool/comp/lang/c/16717

Internet Message Format | 1992-11-18 | 1.6 KB

Path: sparky!uunet!usc!sol.ctr.columbia.edu!spool.mu.edu!olivea!charnel!sifon!thunder.mcrcim.mcgill.edu!mouse
From: [e-mail] (der Mouse)
Newsgroups: comp.lang.c
Subject: Re: Multiple Parameter Passing (unspecified number)
Message-ID: <[e-mail]>
Date: 18 Nov 92 11:36:42 GMT
References: <[e-mail]> <[e-mail]>
Organization: McGill Research Centre for Intelligent Machines
Lines: 26

In article <[e-mail]>, [e-mail] (Jeff Wandling) writes:
> [e-mail] (walter misar) writes:
>> In article <[e-mail]>, <[e-mail]> writes:

>>> I'm looking to write a function that accepts any number of
>>> paramerter.  [all varying params will be cbar *]
>> [...]
> I'm trying to do a similar thing, except my function doesn't know
> what type to expect.  The next "variable argument" could be any
> simple type.  How do I deal with this?

You don't.  Your function *must* be able to tell, somehow, the type of
each argument; C simply does not give you any choice about this.  It
doesn't matter how.  The example that started this thread knows that
all its varargs arguments are char * a priori.  printf figures it out
from the format string.  You could use global variables or anything
else that'll get this information - but get it you must.

> Is there a way to switch on the type of the next argument?

No, that information is not available to the called function.

                    der Mouse

                [e-mail]