On Mon, 30 Nov 2009 14:36:44 +0000, Dermot wrote:
> sub get_cached_val_or_lookup {
> my $val = shift;
> return $cache{$val} ||= do {
Could be more effective in 5.10 with
return $cache{$val} //= do {
to avoid repeating the fetch for values that are false.
> One more question If I can. Chas pointed me to
> http://perldesignpatterns.com/?PerlDesignPatterns some time ago. I
> suspect that the above is a form of design pattern. Does it have a name?
It's called the Orcish Maneuver ("or-cache"). See: "Effective Perl
Programming", Hall with Schwartz.
> Is there a reference to it at
> http://perldesignpatterns.com/?PerlDesignPatterns
It's not really a design pattern, those are about higher levels of
abstraction to do with objects. Usually. It's an idiom.
--
Peter Scott
http://www.perlmedic.com/
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