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Groups > comp.lang.perl.misc > #4734

Re: getting hash reference from a package

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gbacon@hiwaay.net (Greg Bacon) writes:
> Jack wrote:
> : Question: Is it proper to access a package variable directly? Would it
> : not be better to provide a method to retrieve the reference?
>
> As a rule of thumb, pass parameters to subs and methods rather than
> communicating through global variables. A singleton is a global variable
> dressed in fancy clothes, so avoid those too.

A singleton is the Java programmer's workaround for the fact that
Java requires everything to be an instance of some class, that is,
a general blueprint for construction objects of certain kinds, but
that many real-world problems are easier dealt with by systems
constructed of stateful modules ('subsystems') providing some kind of
identifiable, useful functionality for solving a part of the original
problem (that's similar to complex real machines which are also
composed of cooperating 'sub-machines' dealing with 'subtasks' of the
problem supposed to be solved).

Apart from that, an object instance is a set of variables shared by
some set of cooperating subroutines and this is nothing but 'a global
variable dressed in fancy clothes'. Some people are convinced that
complex objects whose state changes over time are Evil[tm] and should
be avoided. Except when the result can be eaten, I presume ...

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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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