Hello,

I would like to define some errorcodes in a base class and be able to use them in all of the sub-classes. Following "Perl Best Practices" I tried it with the Readonly module:
# in base class:
our $TIMEOUT_ERROR;
Readonly $TIMEOUT_ERROR => 10;
# I also tried this instead:
# Readonly our $TIMEOUT_ERROR => 10;

# then in the sub class:
if ($nothing_happens) {
    $self->errorcode( $TIMEOUT_ERROR );
}

[download]
But this doen't work. I always get:
Global symbol "$TIMEOUT_ERROR" requires explicit package name at <sub class source file>

I also tried it with "use vars qw($TIMEOUT_ERROR)" in the base class but same result.
What I would like to avoid:
- copy and paste the constant definitions to every subclass
- use readonly object attributes like $self->TIMEOUT_ERROR

Do I have to fall back to the traditional "use constant" or is there a solution with Readonly?

Thanks
Michael

In reply to inherit Readonly variables (constants) by Anonymous Monk

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.