in reply to Re: understanding my() and typeglobs (perl6)
in thread understanding my() and typeglobs

Is this lexical-including-sigil documented anywhere?. The pod for my() and perlsub dont give much away.

I was aware typeglobs were on the way out, and I agree this is probably a good thing - but in perl5, i think knowing how to apply this technique can be useful where handles and data need to be kept together.
I was actually hoping some monks offer other scenarios they use GLOB refs for, but it appears to be my own little fetish :D.

Sofar, I have found the biggest learning/usage payoff is with socket servers. Using the array part of the servers GLOB ref to pool connections - like the IO::Select array, but a nicer abstraction than the cargo-cultish IO::Select docs example.

thanks again all
and if you too share a GLOB ref fetish, call 0800-GLOBREF-SICK today!


time was, I could move my arms like a bird and...
  • Comment on Re: Re: understanding my() and typeglobs (perl6)

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Re^3: understanding my() and typeglobs (perl6)
by diotalevi (Canon) on Mar 17, 2003 at 14:59 UTC

    Try this out. You'll note that the lexical's name is directly stored as '%method'. This isn't documented since you have to reach into the guts to get a lexical's name back out again so unless you're doing something really, highly unusual it doesn't show up.

    =pod Sample output ... Names no name '%methods' no name Values B::AV=SCALAR(0x8cb00) B::HV=SCALAR(0x8cb18) B::NULL=SCALAR(0x8cb30) =cut use strict; use warnings; no warnings 'uninitialized'; use constant DEBUG => 1; use B; { # Get my new really private object where even # the methods are hidden my $object = new object; # and now violate it. Privacy? Ha! my $c_hash = extractLexHash( $object ); while (my ($key, $val) = each %$c_hash ) { print "$key\t@$val\n"; } } sub extractLexHash { my $Obj = B::svref_2object($_[0]); my ($LexicalNames, $LexicalValues) = map { [ $_->ARRAY ] } $Obj->PADLIST->ARRAY; # for a cheap thrill print the contents of # $LexicalNames if (DEBUG) { print "Names\n"; print "@{[$_->can('PV') ? \"'\".$_->PV().\"'\" : 'no name']}\n +" for @$LexicalNames; print "Values\n"; print "$_\n" for @$LexicalValues; exit; } my %Lexicals = (); for my $index (0 .. # min(@LexicalNames, @LexicalValues) (@$LexicalNames < @$LexicalValues ? @$LexicalNames : @$Lexica +lValues)) { next unless B::class($LexicalNames->[$index]) eq 'PVNV'; my @values = $LexicalValues -> [$index] -> ARRAY; while (@values) { my $LexicalName = shift @values; my $LexicalObj = shift @values; $Lexicals{$LexicalName} = [ $LexicalName, bless(B::svref_2object(\$Lexic +alName),'B::IV')->IVX, $LexicalObj->RV ]; } } return \%Lexicals; } package object; sub new { my %methods; %methods = ( me => sub { print "me!\n" }, you => sub { print "you!\n" } ); bless sub { $methods{me}->() }, 'object'; }
      woah!
      that'll shut me up for a while ;)


      time was, I could move my arms like a bird and...