David Storrs writes:
> On Wed, Jan 14, 2004 at 11:57:05AM +0000, Richard Nuttall wrote:
>
> > How about
> >
> > $test = sub
> > {
> > if ( some_expensive_lookup_function() >= $MAX_RECORDS )
> >
> > mark_that_we_have_reached_max_records();
> >
> > $test = sub{};
> > };
> >
> > Then call &$test() as needed;
>
>
> Neat. I wouldn't have thought of that; thank you.
Let's not mention that that has way more overhead than a
short-circuiting test, but I guess "the idea's the important thing".
Slight correction here,
&$test()
will not call that sub. Both of:
$test()
$test.()
Will, and I think
&$test.()
Will, but &$test() just refers to the sub object itself.
Which brings up a question: Can you have a sub reference to a multi?
That is to say, one reference referring to a multiply-dispatched name.
For example:
multi sub typrint(Int $x) { print "Int $x" }
multi sub typrint(Str $x) { print "Str $x" }
my $ref = &typrint;
$ref.(99); # Int 99
$ref.("Hello"); # Str Hello
?
Luke
Luke
> --Dks
