Path: utzoo!attcan!uunet!image.soe.clarkson.edu!news
From: nelson@sun.soe.clarkson.edu (Russ Nelson)
Newsgroups: comp.lang.c
Subject: Structure constructors?
Message-ID: <NELSON.90Mar22093113@image.clarkson.edu>
Date: 22 Mar 90 14:31:21 GMT
Sender: news@sun.soe.clarkson.edu
Reply-To: nelson@clutx.clarkson.edu
Organization: Clarkson University, Potsdam NY
Lines: 31

Are there any tricks I can use to fake structure contructors in Turbo C?

I'd like to do the following:

struct point {int x,y};					/* the structure */

draw_line(struct point from, struct point to);		/* called function */

draw_box(struct point topleft, struct point botright)	/* calling function */
{
	draw_line(topleft, point_constructor(botright.x-1, topleft.y));
	/* etc....  We all know how to draw a box by now */
}

Now, I'm sure I could do it like this:

static struct point constructed;

#define point_constructor(x,y) (	\
	constructed.x = x,		\
	constructed.y = y,		\
	constructed)

But gosh I'd like to avoid the extra memory store that's required.
I'm not too concerned about portability, because I can always fall
back to calling a function that returns a structure.  Feel free to
use any Turbo C tricks that are helpful.
--
--russ (nelson@clutx [.bitnet | .clarkson.edu])  Russ.Nelson@$315.268.6667
Violence never solves problems, it just changes them into more subtle problems