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From: robert@gitpyr.UUCP (Robert Viduya)
Newsgroups: net.lang.c
Subject: Re: runtime 'sizeof()'?
Message-ID: <38@gitpyr.UUCP>
Date: Sat, 19-Jan-85 22:36:04 EST
Article-I.D.: gitpyr.38
Posted: Sat Jan 19 22:36:04 1985
Date-Received: Wed, 23-Jan-85 04:47:18 EST
References: <33@gitpyr.UUCP>
Distribution: net
Organization: Georgia Tech, Atlanta
Lines: 43

[]

Judging from mail I've recieved about the subject, I think I was a bit
unclear about the problem.  This should clear things up.

The problem is that the sizeof operator produces different answers
when used in two different source files.  I can declare the following
in one source file:

	  ...

	struct s a[] = { 
		{ "....",0,0,0 },
		{ ",,,,",1,1,1 },
	};

	  ...

	b = sizeof (a);

and have b be set to some number representing the size of a in bytes, but
I cannot refer to the same structure from another source file:

	  ...

	extern struct a[];

	  ...

	b = sizeof (a);		/* set to zero or a compiler error msg */

The array is defined and initialized to contain data.  Therefore, the
sizeof operator should work *regardless* of what source file it is used in.

			robert
-- 
Robert Viduya
    Office of Computing Services
    Georgia Institute of Technology, Atlanta GA 30332
    Phone:  (404) 894-4669

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