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From: throopw@dg_rtp.UUCP (Wayne Throop)
Newsgroups: comp.lang.c
Subject: Re: Determing alignment of (char *) pointer
Message-ID: <739@dg_rtp.UUCP>
Date: Mon, 8-Dec-86 11:11:28 EST
Article-I.D.: dg_rtp.739
Posted: Mon Dec  8 11:11:28 1986
Date-Received: Wed, 10-Dec-86 02:47:51 EST
References: <1510@mit-trillian.MIT.EDU> <487@cartan.Berkeley.EDU>
Lines: 16

> desj@brahms (David desJardins)
>   Why not use
>       if (p != (char *) (long *) p) ... ?
>    This should give you the relevant information (can a long be stored at
> the location pointed to by p?) without any machine dependencies.  I suppose
> on some (broken) compilers it might not work...

Well... no.  C casts don't guarantee to alter the alignment of pointers
to reflect architectural restrictions.  They just DON'T guarantee NOT to
do so.  Basically, there isn't any portable way of doing this.

--
A LISP programmer knows the value of everything, but the cost of nothing.
                                --- Alan J. Perlis
-- 
Wayne Throop      <the-known-world>!mcnc!rti-sel!dg_rtp!throopw