Re: Unusual variable declaration


more useful options
	PerlMonks

Re: Unusual variable declaration

by choroba (Cardinal)

on Nov 02, 2019 at 21:46 UTC ( [id://11108263]=note: print w/replies, xml )

Need Help??

in reply to Unusual variable declaration

The first line declares an alias $var for the global variable $var in the current package. The second line makes it an alias of the $var variable in the main package.

Therefore, it only makes sense to use this in a package different to main. For example:

#!/usr/bin/perl
use warnings;
use strict;

our $var;
$var = 42;

{   package My;

    our $var;
    *var = \$main::var;
    print $var, "\n";
    $var = 84;
}

print $var, "\n";
[download]

map{substr$_->[0],$_->[1]||0,1}[\*||{},3],[[]],[ref qr-1,-,-1],[{}],[sub{}^*ARGV,3]

Comment on Re: Unusual variable declaration Select or Download Code

Replies are listed 'Best First'.
Re^2: Unusual variable declaration by LanX (Saint) on Nov 03, 2019 at 12:12 UTC
Addendum: local I almost always use this construct with `local` except if I want to alias globally. `local *var = \$main::var;` Otherwise any later use of `$My::var` in another scope will also be aliased. importing Should also be mentioned that typeglob aliasing is the essential underlying mechanism `Exporter` is using. Though mostly for subs not vars and always globally. Cheers Rolf _{(addicted to the Perl Programming Language :) Wikisyntax for the Monastery FootballPerl is like chess, only without the dice}	[reply] [d/l] [select]
Re^2: Unusual variable declaration by haukex (Archbishop) on Nov 02, 2019 at 21:49 UTC
Exactly what I was going to say :-) The most relevant docs are probably perlmod.	[reply]

In Section Seekers of Perl Wisdom

Domain Nodelet^?

www.com | www.net | www.org

Node Status^?

node history
Node Type: note [id://11108263]
help

Chatterbox^?

How do I use this? • Last hour • Other CB clients

Other Users^?

Others chanting in the Monastery: (7)

As of 2024-04-25 15:47 GMT

Sections^?

Information^?

Find Nodes^?

Leftovers^?

Today I Learned

Voting Booth^?

No recent polls found