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From: garys@bunker.UUCP (Gary M. Samuelson)
Newsgroups: net.lang.c
Subject: Re: problems with the C parser
Message-ID: <1171@bunker.UUCP>
Date: Fri, 30-May-86 10:29:04 EDT
Article-I.D.: bunker.1171
Posted: Fri May 30 10:29:04 1986
Date-Received: Sat, 31-May-86 07:21:17 EDT
References: <5072@topaz.RUTGERS.EDU>
Reply-To: garys@bunker.UUCP (Gary M. Samuelson)
Organization: Bunker Ramo, Trumbull Ct
Lines: 36
Keywords: bitfield,structure,'%&#@*

In article <5072@topaz.RUTGERS.EDU> brisco@topaz.UUCP writes:

>	typedef union {
>		int intfield;   /* change the record name - keyword */
>		struct bool{unsigned x[32]:1};
>		} newtype;

>	Can anyone else compile the above structure declaration?

No.  You didn't read far enough:
	"In all implementations, there are no arrays of fields"
	K&R, p. 197

I tried
	typedef union {
		int intfield;
		struct bool {int x:1; }bit[32];
		} newtype;

But each bit takes up an entire unsigned, so the size of the above
is 32 * sizeof (unsigned).

I think you will have to choose from masks, or making each bit a
separate field:
	typedef union {
		int intfield;
		struct	bool {
			unsigned
			x0:1,  x1:1,  x2:1,  x3:1,  x4:1,  x5:1,  x6:1,  x7:1,
			x8:1,  x9:1,  x10:1, x11:1, x12:1, x13:1, x14:1, x15:1,
			x16:1, x17:1, x18:1, x19:1, x20:1, x21:1, x22:1, x23:1,
			x24:1, x25:1, x26:1, x27:1, x28:1, x29:1, x30:1, x31:1;
		}
	} newtype;

Gary Samuelson