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Path: utzoo!utcsri!utgpu!woods
From: woods@gpu.utcs.toronto.edu
Newsgroups: comp.lang.c
Subject: Re: zero length array
Message-ID: <1987Feb25.201816.29714@gpu.utcs.toronto.edu>
Date: Wed, 25-Feb-87 20:18:16 EST
Article-I.D.: gpu.1987Feb25.201816.29714
Posted: Wed Feb 25 20:18:16 1987
Date-Received: Wed, 25-Feb-87 20:35:48 EST
References: <4498@brl-adm.ARPA>
Reply-To: woods@gpu.utcs.UUCP (Greg Woods)
Organization: University of Toronto Computing Services
Lines: 14
Keywords: NULL cast portability
Checksum: 15653
Summary: NULL cast portability

In article <4498@brl-adm.ARPA> Dizio@udel.edu writes:
>   Is the following a portable way of finding out where a field
>within a structure is located?
>
>    & (((struct any_struct_tag *) 0)->any_field)

Not that I know of, though the expression without "&" is usefull in sizeof().

Some compilers will refuse to cast NULL, specifically Lattice C up to 2.15(?)
As far as I know all Unix compilers will cast NULL.

You might want to cast one(1) instead.  Lattice will accept this.

						Greg Woods.