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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.


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