Hi PerlMonks,

Instead of exporting a package variable I intended to return the value via 'eval' in a module function. Surprisingly the value is just returned, if I also access the variable 'natively'

Module:

package MyModule2;

use strict;
use Exporter;
use vars qw($VERSION @ISA @EXPORT @EXPORT_OK %EXPORT_TAGS);

$VERSION     = 1.00;
@ISA         = qw(Exporter);
@EXPORT      = ();
@EXPORT_OK   = qw(func3 func4);
%EXPORT_TAGS = ( DEFAULT => [qw(&func3)],
                 All    => [qw(&func3 &func4)]);

my $myscalar = "MyScalarValue";

sub func3  {
   my $x;
   my $y;
   printf "MyModule2/func3: >%s<\n",$_[0];
   $x = eval "$_[0]";
   return $x;
}

sub func4  {
   my $x;
   my $y;
   printf "MyModule2/func4: >%s<\n",$_[0];
   $x = eval "$_[0]";
   $y = $myscalar;
   return $x;
}

1;

[download]

script:

#!/usr/bin/perl -w

use strict;

use MyModule2 qw(:All);

printf "MyScript2/func3: >%s<\n",func3('$myscalar');
printf "MyScript2/func4: >%s<\n",func4('$myscalar');

[download]

output:

perl MyScript2.pl
MyModule2/func3: >$myscalar<
Use of uninitialized value in printf at MyScript2.pl line 7.
MyScript2/func3: ><
MyModule2/func4: >$myscalar<
MyScript2/func4: >MyScalarValue<

[download]

is there any explanation for this behaviour?

In reply to [SOLVED]: eval in perl package by MarcusE

Title:
Use:  <p> text here (a paragraph) </p>
and:  <code> code here </code>
to format your post, it's "PerlMonks-approved HTML":


  • Posts are HTML formatted. Put <p> </p> tags around your paragraphs. Put <code> </code> tags around your code and data!
  • Titles consisting of a single word are discouraged, and in most cases are disallowed outright.
  • Read Where should I post X? if you're not absolutely sure you're posting in the right place.
  • Please read these before you post! —
  • Posts may use any of the Perl Monks Approved HTML tags:
    a, abbr, b, big, blockquote, br, caption, center, col, colgroup, dd, del, details, div, dl, dt, em, font, h1, h2, h3, h4, h5, h6, hr, i, ins, li, ol, p, pre, readmore, small, span, spoiler, strike, strong, sub, summary, sup, table, tbody, td, tfoot, th, thead, tr, tt, u, ul, wbr
  • You may need to use entities for some characters, as follows. (Exception: Within code tags, you can put the characters literally.)
            For:     Use:
    & &amp;
    < &lt;
    > &gt;
    [ &#91;
    ] &#93;
  • Link using PerlMonks shortcuts! What shortcuts can I use for linking?
  • See Writeup Formatting Tips and other pages linked from there for more info.