Accessing fields of structs in array

Question

I have an array of structs (from Class::Struct) and I am having trouble accessing their 'fields'. I've looked at other solutions such as Perl - Class::Struct Deferencing array and Perl documentation without success. My code is:

use Class::Struct;
use Data::Dump qw(dump);

struct( Tag => {
    attributes => '%',
    value => '$'
});

my @data = [];
push @data, Tag->new(attributes => { 'id' => 1 }, value => "hello world!");
dump @data;



my $tag = $data[0];
my $value = $tag->value;
print $value, "\n";

I've tried variations on blessing $tag with 'Tag' (since can't call value on unblessed ... is the current error), dereferencing $tag as a hash, and more.

Suic · Accepted Answer · 2013-11-03 08:11:57Z

6

Your error is in initialization of @data:

my @data = []; # the same as my @data = ( [] );

You declare array called @data and initialize it with one empy array ref. Next you push second element to array using push. Your class now in $data[1]. So fixed example:

struct( Tag => {
    attributes => '%',
    value => '$'
});

my @data;
push @data, Tag->new(attributes => { 'id' => 1 }, value => "hello world!");

my $tag = $data[0];
my $value = $tag->value;
print $value, "\n";

answered Nov 3, 2013 at 8:11

Suic

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1 Comment

timrs2998 Over a year ago

Thank you! I spent a couple hours on that and never would have figured out the problem. Data dumper even showed [] in the array and I ignored it every time.

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