Beefy Boxes and Bandwidth Generously Provided by pair Networks
No such thing as a small change
 
PerlMonks  

Re^2: Local for lexicals (KISS)

by Roy Johnson (Monsignor)
on Aug 13, 2009 at 15:25 UTC ( #788346=note: print w/ replies, xml ) Need Help??


in reply to Re: Local for lexicals (KISS)
in thread Local for lexicals

And here's the syntactic sugar to make the invocation concise:

#!perl use strict; use warnings; my $x = 1; sub lambda { my $fn = pop; my @argrefs = \(@_); sub { my @scopes= map { tempSet( $argrefs[$_], $_[$_] ) } 0..$#_; &$fn; } } my $y = 'Yval'; my $closure = lambda $x, $y => sub { "$x and $y" }; print $closure->($_, rand(3)), "(X=$x, Y=$y)\n" for (qw(a bitty china +doll)); print "$x and $y\n"; # => 1 sub TempSet::DESTROY { shift(@_)->() } sub tempSet { my( $sv, $new )= @_; my $prior= $$sv; my $restore= bless sub { $$sv= $prior }, 'TempSet'; $$sv= $new; return $restore; }

Caution: Contents may have been coded under pressure.


Comment on Re^2: Local for lexicals (KISS)
Download Code

Log In?
Username:
Password:

What's my password?
Create A New User
Node Status?
node history
Node Type: note [id://788346]
help
Chatterbox?
and the web crawler heard nothing...

How do I use this? | Other CB clients
Other Users?
Others surveying the Monastery: (11)
As of 2014-07-29 20:54 GMT
Sections?
Information?
Find Nodes?
Leftovers?
    Voting Booth?

    My favorite superfluous repetitious redundant duplicative phrase is:









    Results (228 votes), past polls