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Groups > comp.lang.perl.misc > #4724

Re: getting hash reference from a package

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In article <jjntgq$an4$1@dont-email.me>,
Bill M  <wpmccormick@just_about_everywhere.com> wrote:
>Bill M wrote, On 3/13/2012 11:28 AM:
>> What is the correct syntax for accessing a hash reference from a package?
>>
>> For example:
>>
>> package MyPackage;
>> my $foo = {
>> animals => ["cat", "dog", "fish"],
>> people => ["fred", "wilma" ]
>> };
>>
>> 1;

I added the missing double-quote before wilma and lowercased
"package".

"1;" usually comes at the end of a module file.  So I assume that
that's in its own file, named MyPackage.pm.

>use MyPackage;
Yeah, that requires a separate source file named MyPackage.pm or such.
>
>foreach my $animal (@{$MyPackage::foo->{animals}}) {
>     print $animal;
>}

Realize that "my" is lexical only.

(1) "my" does not create a package variable.  There is no
$MyPackage::foo variable in MyPackage.  When you refer to it in the
other file, it creates on that spot a variable set to undef.

(2) It's lexical only, so it exists only inside the file's scope.
It's not visible outside, so trying to refer to just "$foo" would get
you an error "Global symbol "$foo" requires explicit package name".

So replace "my" by "our" in MyPackage and it all works as you expect.

-- 
Tim McDaniel, tmcd@panix.com

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getting hash reference from a package Bill M <wpmccormick@just_about_everywhere.com> - 2012-03-13 11:28 -0500
  Re: getting hash reference from a package Bill M <wpmccormick@just_about_everywhere.com> - 2012-03-13 11:44 -0500
    Re: getting hash reference from a package tmcd@panix.com (Tim McDaniel) - 2012-03-13 17:56 +0000
      Re: getting hash reference from a package Bill M <wpmccormick@just_about_everywhere.com> - 2012-03-13 13:07 -0500
        Re: getting hash reference from a package Jack <goodcall1@hotmail.com> - 2012-03-14 01:57 -0600
          Re: getting hash reference from a package Martijn Lievaart <m@rtij.nl.invlalid> - 2012-03-14 12:06 +0100
            Re: getting hash reference from a package tmcd@panix.com (Tim McDaniel) - 2012-03-14 15:37 +0000
              Re: getting hash reference from a package Ben Morrow <ben@morrow.me.uk> - 2012-03-14 17:54 +0000
          Re: getting hash reference from a package Ben Morrow <ben@morrow.me.uk> - 2012-03-14 14:27 +0000
            Re: getting hash reference from a package Rainer Weikusat <rweikusat@mssgmbh.com> - 2012-03-14 18:28 +0000
              Re: getting hash reference from a package Ben Morrow <ben@morrow.me.uk> - 2012-03-14 21:08 +0000
                Re: getting hash reference from a package Rainer Weikusat <rweikusat@mssgmbh.com> - 2012-03-14 21:23 +0000
          Re: getting hash reference from a package gbacon@hiwaay.net (Greg Bacon) - 2012-03-14 12:20 -0500
            Re: getting hash reference from a package Rainer Weikusat <rweikusat@mssgmbh.com> - 2012-03-14 18:14 +0000
              Re: getting hash reference from a package gbacon@hiwaay.net (Greg Bacon) - 2012-03-16 12:11 -0500
                Re: getting hash reference from a package Rainer Weikusat <rweikusat@mssgmbh.com> - 2012-03-18 22:12 +0000
                Re: getting hash reference from a package gbacon@hiwaay.net (Greg Bacon) - 2012-03-20 10:28 -0500
          Re: getting hash reference from a package Rainer Weikusat <rweikusat@mssgmbh.com> - 2012-03-14 20:52 +0000

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