As I understand it the %hash isn't actually in scope when the ATTR handler is called, so there is no way to get at it with PadWalker...

Demonstration.

#! /usr/bin/perl

use strict;
use warnings;

package Foo;
use Attribute::Handlers;
use PadWalker qw(peek_my);
use Data::Dumper;

sub Field : ATTR(HASH) {
    my ($class, $symbol, $hash) = @_;
    if ($symbol eq 'LEXICAL') {
        my $level=0;
        while (eval {peek_my($level+1)} && !$@) {$level++};
        print Dumper(peek_my($level));
    } else {
        print "got %", *{$symbol}{NAME}, " from symbol table\n";
    }; 
};

package FooBar;
use base qw(Foo);

my %just_to_prove_we_are_in_the_right_scope;
print "about to call ATTR with \\%foo\n";
my %foo : Field;
print "about to call ATTR with \\%bar\n";
my %bar : Field;

[download]

produces

about to call ATTR with \%foo
$VAR1 = {
          '%just_to_prove_we_are_in_the_right_scope' => {}
        };
about to call ATTR with \%bar
$VAR1 = {
          '%just_to_prove_we_are_in_the_right_scope' => {},
          '%foo' => {}
        };

[download]

Unless I'm missing something (entirely possible) I don't see how Devel::Caller can help here? There isn't a way that (in the above example) you can get at the name 'foo' at the time the %foo hash reference is passed to the ATTR handler.

In reply to Re^4: Class::InsideOut - yet another riff on inside out objects. by adrianh
in thread Class::InsideOut - yet another riff on inside out objects. by adrianh

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