On Fri, 9 Jul 2004 02:55:41 -0700, John W. Krahn wrote
>
> Perhaps you should keep the localtime data local to the sub (sort of
> like a closure.)
>
> { my %data;
> sub getDateTime {
> unless ( %data ) {
> @data{ qw[sec min hour day mon year wday yday isdst] } =
> localtime $^T; $data{ year } += 1900; $data{
> mon }++; } return %data; } }
>
I read about closures in the the o'reilly objects, classes and references
book, but I don't think it sunk in. Would this work if this sub is in a
module? Does this basically make %data the equivalent of a Java static, where
all calls to the sub get the same variable? If the caller undefs all
references to %data, won't %data disappear? I don't see how the syntax of
putting it in another set of braces makes it a closure (don't have the book
with me today). Anyway if you have time to answer any of these issues I would
appreciate it. For now, until I can prove (at least to myself) that $^T is
changing I'm going to leave the code as it is, but I would like to understand
more about closures (not sure that's for a beginner's forum?).
Thanks again,
-John
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