OpenEuphoria

RE: three stupid newbie questions :-)

• Posted by Andy Serpa <ac at onehorseshy.com> Jan 20, 2004
• 462 views

Pete Lomax wrote:
> 
> 
> On Mon, 19 Jan 2004 10:53:25 -0800 (PST), Guest
> <guest at RapidEuphoria.com> wrote:
> 
> >posted by: shenpen at freemail.hu

> >
> >while not atom(line=gets(filehandle)) 
> The inner compare is a sequence operation: if both lhs and rhs are
> atoms it returns pretty much what you might expect, if one is an atom,
> it compares that against all the elements on the other side, if both
> are sequences, they must be the same length or it stops with a fatal
> error. If the lhs and the rhs are same size/shape tree then you get
> back a same size/shape tree filled with 1's and 0's. FWIW I don't
> think that is particularly useful and would vote to change it, but it
> is a fairly core concept in the language.
> 
I don't think he meant it as a compare at all [ line = gets(filehandle) 
], only as an assignment, and Euphoria doesn't allow those type of 
assignments.

Regarding the usefulness of the Euphorian-style sequence comparison -- I 
couldn't go without it.  Makes my code at least 50% easier to write than 
it would be otherwise.  Love it.  I'm lobbying for the conditional 
operator to make it even easier...

> You have to use either:
> 
> while 1 do
> 	line=gets(filehandle)
> 	if atom(line) then exit end if
> 

The solution is the same, however.

> Or:
> 
> function setline(object x)
> 	line = x
> 	return x
> end function
> 
> while not atom(setline(gets(filehandle))) do
> 
I like the first is better.  Avoids the global.