From mboxrd@z Thu Jan  1 00:00:00 1970
From: Sam <sah@softcardsystems.com>
To: <9fans@cse.psu.edu>
Message-ID: <Pine.LNX.4.30.0207160952590.14125-100000@athena>
MIME-Version: 1.0
Content-Type: TEXT/PLAIN; charset=US-ASCII
Subject: [9fans] useful language extension, or no?
Date: Tue, 16 Jul 2002 10:12:13 -0400
Topicbox-Message-UUID: cd49ad72-eaca-11e9-9e20-41e7f4b1d025

I find myself and others occasionally doing the following:

for(i=0; i<NELS; i++) {
	// do some stuff
	// do more stuff
}

if(i == NELS) {
	// do cleanup or something ...
	// typically it's "damn, it wasn't in the array, exit"
}

So what do 9'ers think about an extension to the for loop
like this:

for(i=0; i<NELS; i++) {
	// do some stuff
	// do more stuff
} atend {
	// ...
	// ...
}

where the code in atend is only executed if the end of the loop is
hit?  This wouldn't break existing code since the usual case of

for(...) {

}

just equates to

for(...) {

} atend
	;

and thusly the atend can be removed, and it would save an extra
comparison/branch sequence in the emitted code (it seems).

Looking forward to your thoughts!

Cheers,

Sam