> If a blessed object kept track of whether it was associated with a package of that name, and the information went into the Dumper output, then when the string was evaled, if there was no package of the right name loaded, it could point that out (optional extra parameter to bless, or something?).

OK if you only want to be warned if the package doesn't exist, you can also override bless locally inside a package to do the check for you.

please note that blessing will autovivify the class, i.e. the package TST1:: will "exist".

use strict;
use warnings;
use Data::Dumper;

my $obj = bless {}, "TST1";
my $str1 = Dumper $obj;

my $str2 = q($VAR1 = bless( {}, 'TST2' ););




package Bless::Safe;


use subs qw/bless/;

sub bless ($;$) {
    my ($obj,$class) = @_;
    die "Can't bless into non-existent Package $class"
      unless exists $main::{"${class}::"};
}


our $VAR1;

eval($str1) or $@ && die $@;                     # OK
eval($str2) or $@ && die $@;                     # FAILS
[download]

---

Can't bless into non-existent Package TST2 at d:/tmp/pm/override_bless.pl line 21.

HTH! :)

updates

fixed bug in $@ check

added prototype

---

In reply to Re: Class / package weak association by LanX
in thread Class / package weak association by dd-b

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