Path: utzoo!utgpu!news-server.csri.toronto.edu!rpi!usc!apple!portal!cup.portal.com!Will
From: Will@cup.portal.com (Will E Estes)
Newsgroups: comp.lang.smalltalk
Subject: Nested Control Structures Within Iterators
Message-ID: <41040@cup.portal.com>
Date: 8 Apr 91 06:58:34 GMT
Organization: The Portal System (TM)
Lines: 22

Can someone explain to me whether it is possible to place another 
control structure on the same line as an iterator?  Say, for instance,
that I'm iterating across a file stream and I want to continue to
do so only while some condition is true.

	input do:
	[
		:char |
		output nextPut: char.
		"more code here"
	].

Now what I would like to do is qualify the iteration of do: such that
when some condition becomes true we stop iterating?  One thought that
comes to mind is an equivalent to the C control structure BREAK, but
I was not able to find this.  Is there someone of achieving the effect
of BREAK?  And if not is there some way of further qualifying the
iterator statement?

Thanks,
Will Estes        Internet: Will@cup.portal.com                  
                  UUCP: apple!cup.portal.com!Will