Beefy Boxes and Bandwidth Generously Provided by pair Networks
Syntactic Confectionery Delight
 
PerlMonks  

Re^2: Help with cause of "Modification of a read-only value attempted at ..."

by shriken (Priest)
on Sep 28, 2010 at 15:23 UTC ( #862448=note: print w/ replies, xml ) Need Help??


in reply to Re: Help with cause of "Modification of a read-only value attempted at ..."
in thread Help with cause of "Modification of a read-only value attempted at ..."

Trimming down, even before I have a small case that shows the error I have something else wrong. Here're two files that give me different results on 5.8.8 versus 5.10. I think I've already done something wrong at this level of simplicity that I should figure out before building the example up farther.

use strict; use warnings; use configthing qw(); our configthing $cfg = new configthing; use Data::Dumper; print Dumper $cfg;

Then for "configthing.pm"...

package configthing; use strict; use warnings; use fields qw( a b c d ); our %DEFAULTS = ( b => 'default for b', c => 'default for c' ); 1; sub new { my $this = shift; unless (ref $this) { $this = fields::new($this); } our %FIELDS; foreach my $k ( keys(%FIELDS) ) { $this->{$k} = '' unless defined($this->{$k}); } $this->{a} = 'set at initialization'; foreach my $k ( keys(%DEFAULTS) ) { $this->{$k} = $DEFAULTS{$k}; } return $this; }

With 5.8.8 I get

$VAR1 = bless( [ bless( { 'c' => 3, 'a' => 1, 'b' => 2, 'd' => 4 }, 'pseudohash' ), 'set at initialization', 'default for b', 'default for c', '' ], 'configthing' );

And 5.10.1 gives me:

$VAR1 = bless( { 'c' => 'default for c', 'a' => 'set at initialization', 'b' => 'default for b', 'd' => '' }, 'configthing' );


Comment on Re^2: Help with cause of "Modification of a read-only value attempted at ..."
Select or Download Code
Re^3: Help with cause of "Modification of a read-only value attempted at ..."
by Corion (Pope) on Sep 28, 2010 at 15:29 UTC

    This is completely to be expected in a change from 5.8 to 5.10 because pseudohashes do not exist anymore in 5.10. The implementation of fields was changed to shield you from this other change I believe.

Log In?
Username:
Password:

What's my password?
Create A New User
Node Status?
node history
Node Type: note [id://862448]
help
Chatterbox?
and the web crawler heard nothing...

How do I use this? | Other CB clients
Other Users?
Others contemplating the Monastery: (8)
As of 2015-07-06 06:29 GMT
Sections?
Information?
Find Nodes?
Leftovers?
    Voting Booth?

    The top three priorities of my open tasks are (in descending order of likelihood to be worked on) ...









    Results (70 votes), past polls