Perl Guru Forums: Perl Programming Help: Intermediate: A simple hash and arrays problem?

CGI/Perl Guide | Learning Center | Forums | Advertise | Login

Site Search: in


	MAIN INDEX	SEARCH POSTS	WHO'S ONLINE	LOG IN

Home: Perl Programming Help: Intermediate:
A simple hash and arrays problem?

KeithBoynton
New User

Feb 25, 2004, 3:27 PM

Post #1 of 3 (510 views)

A simple hash and arrays problem?	Can't Post

A simple problem very probably:

I can define an hash containing an array like this (and it works fine):

Code

my @array=('one','two'); 
my %hash= ( 	1 => {	'Name'  =>Something', 
			'Root'  =>'Something else' 
			}, 
 
		2 => {	'Name'  =>'Something Again', 
			'Root'  =>'Something else ..', 
			'anArray' => \@array 
			} 
		);

Yet if I try to define it like this, it doesn't work:

Code

my %hash= ( 	1 => {	'Name'  =>Something', 
			'Root'  =>'Something else' 
			}, 
 
		2 => {	'Name'  =>'Something Again', 
			'Root'  =>'Something else ..', 
			'anArray' => \('one','two') 
			} 
		);

Any ideas why this doesn't work and how I should be doing it?

Thanks in advance :)

davorg
Thaumaturge / Moderator

Feb 25, 2004, 11:45 PM

Post #2 of 3 (508 views)

Re: [KeithBoynton] A simple hash and arrays problem? [In reply to]	Can't Post

From "perldoc perlref":

Quote

Taking a reference to an enumerated list is not the same as using
square brackets--instead it’s the same as creating a list of references!

@list = (\$a, \@b, \%c);
@list = \($a, @b, %c); # same thing!

You can't create a reference to a list. You need to take the reference of an array. You can avoid having to use an intermediate array variable by using the anonymous array constructor - [ .. ].

Code

my %hash= ( 	1 => {	'Name'  =>Something',  
			'Root'  =>'Something else'  
			},  
  
		2 => {	'Name'  =>'Something Again',  
			'Root'  =>'Something else ..',  
			'anArray' => ['one','two'] 
			}  
		);

--
Dave Cross, Perl Hacker, Trainer and Writer
http://www.dave.org.uk/
Get more help at Perl Monks

KeithBoynton
New User

Feb 26, 2004, 12:39 AM

Post #3 of 3 (505 views)

Re: [davorg] A simple hash and arrays problem? [In reply to]	Can't Post

Great stuff, thank you very much! Smile

Search for (options)

Web Applications & Managed Hosting Powered by Gossamer Threads
Visit our Mailing List Archives