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From: francus@cheshire.columbia.edu (Yoseff Francus)
Newsgroups: comp.lang.c
Subject: Re: Another portable code question
Message-ID: <4761@columbia.UUCP>
Date: Tue, 30-Jun-87 09:08:13 EDT
Article-I.D.: columbia.4761
Posted: Tue Jun 30 09:08:13 1987
Date-Received: Sat, 4-Jul-87 22:38:06 EDT
References: <16673@cca.CCA.COM> <1763@ttrdc.UUCP> <16769@cca.CCA.COM> <1019@killer.UUCP> <225@sugar.UUCP>
Sender: nobody@columbia.UUCP
Reply-To: francus@cheshire.columbia.edu.UUCP (Yoseff Francus)
Organization: Columbia University CS Department
Lines: 36

In article <225@sugar.UUCP> peter@sugar.UUCP (Peter DaSilva) writes:
>> There it is in a nutshell, you really don't need the * unless the function
>> is declared int (**func)();, then you have pointer to pointer to a function
>> returning an integer.
>
>According to K and R (1) You do need the *, and (2) (func)() should be
>identical to func(). I'm not sure I approve of compilers taking it upon
>themselves to turn func() into (*func)() without telling me, and I certainly
>won't assume that it will work in any compiler I might come across. The
>meaning of pointers to functions should be well defined. Lately the meanings
>of all sorts of things has become problematical.
>
>While I'm here, let me bitch about structure passing. I really don't think
>there's any reason for passing anything larger than a double on the stack.
>If you want to have a routine to copy it into local storage, you can always
>allocate another copy on the stack in the routine and memcpy() it. It won't
>be significantly slower. On the other hand I've been bitten more than once
>by leaving out an ampersand and having 10,000 bytes pushed on an 8,000 byte
>stack. UNIX => C but C !=> UNIX.


True ususally you want to pass the address of a strucuture.  But what if
you change the values of the structure in the function, and DON'T want
to know about the changes after returning from the function????

Yoseff



******************************************************************
yf
In Xanadu did Kubla Khan a stately pleasure dome decree
But only if the NFL to a franchise would agree.

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