Path: utzoo!utgpu!watmath!clyde!att!osu-cis!tut.cis.ohio-state.edu!cwjcc!hal!nic.MR.NET!tank!mimsy!chris
From: chris@mimsy.UUCP (Chris Torek)
Newsgroups: comp.os.minix
Subject: Re: struct pointers
Message-ID: <14726@mimsy.UUCP>
Date: 27 Nov 88 01:56:38 GMT
References: <5092@whuts.ATT.COM>
Organization: U of Maryland, Dept. of Computer Science, Coll. Pk., MD 20742
Lines: 15

>>struct { int m; } sa[1];
>>sa->m = 0;			/* Compiler chokes on this */

In article <5092@whuts.ATT.COM> mjs@whuts.ATT.COM (SCHEUTZOW) writes:
>[This] seems like a misuse of the pointer operator to me; ....

It is correct.  An object of type `array of T' in an rvalue context is
converted to an rvalue of type `pointer to T' whose value is the
address of the 0'th array element.  The left hand side of the `->'
operator demands an rvalue expression of type `pointer to
struct-or-union'; `sa' here becomes `pointer to struct <noname>', and
the rhs `m' is a member of this structure, so all is fine.
-- 
In-Real-Life: Chris Torek, Univ of MD Comp Sci Dept (+1 301 454 7163)
Domain:	chris@mimsy.umd.edu	Path:	uunet!mimsy!chris