[Catalyst] Simple question about "use Catalyst"

Gianni Ceccarelli dakkar at thenautilus.net
Mon Oct 19 13:50:46 GMT 2015

On Mon, 19 Oct 2015 14:21:15 +0100
"Andrew" <catalystgroup at unitedgames.co.uk> wrote:
> What was the significance of 5.80 being written there? 

It's a general feature of perl, not specific to Catalyst.

As your most probably already know, when you say::

  use Some::Module qw(some thing);

it behaves as if you had written::

    require Some::Module;
    if (Some::Module->can('import')) {
      Some::Module->import(qw(some thing));

When you write::

  use Some::Module 1.3;

it behaves something like::

    require Some::Module;
The ``UNIVERSAL::VERSION`` method throws an exception if (in this
case) the ``$Some::Module::VERSION`` variable has a value less than
what was passed (``1.3``). So you're essentially saying "use this
module, at least this version, or die".

	Dakkar - <Mobilis in mobile>
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without even trying, and yet here I am with a gun to your head. That's
cause I got people with me, people who trust each other, and do for
each other, and ain't always looking for an advantage."

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				--Episode #6, "Our Mrs Reynolds"
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