On 5/1/07, brian d foy <[EMAIL PROTECTED]> wrote:
I was thinking about default filehandles yesterday. select() doesn't
seem to be around except as an "Unfiled" function in S16.
Then, as I was looking at
.say( "Hello World" );
At various times, I have seen something to the effect of each of the
following being bandied about:
$*OUT.say( "Hello World" );
"Hello World".say;
That is, both filehandles and strings have 'say' methods that do
essentially the same thing, but using subtly different syntax. How
would I use &("Hello World".say) to write to filehandle $FH? My gut
reaction would be to use an adverb for the purpose:
"Hello World".say :to($FH);
This would also work for the sub version:
say :to($FH) "Hello World";
With this in mind, you probably could create a localized alias for
'say', if you wanted to:
{
my &say := &OUTER::say.assuming(:to($FH));
say "Hello World"; # same as 'say "Hello World" :to($FH);'
}
The catch with this is that you'd have to do this for each output
routine separately.
How about this: Do the output routines default to the global
filehandles directly, or do they default to lexical bindings of them?
That is, does 'say' output to $*OUT in the absence of an explicit
filehandle, or does it output to $OUT (with the latter normally being
bound to $*OUT)? If the latter, you should be able to redirect all of
your output in the rest of the current scope by saying:
$OUT := $*ERR;
I can understand not being able to rebind the global filehandles.
After all: once they're rebound, how would you ever find what they
were originally bound to?
--
Jonathan "Dataweaver" Lang
