Throwable(3pm)

SYNOPSIS

  package Redirect;
  # NOTE: Moo can also be used here instead of Moose
  use Moose;
  with 'Throwable';
  has url => (is => 'ro');

...then later...

  Redirect->throw({ url => $url });

DESCRIPTION

Throwable is a role for classes that are meant to be thrown as exceptions to standard program flow. It is very simple and does only two things: saves any previous value for $@ and calls "die $self".

Throwable is implemented with Moo, so you can stick to Moo or use Moose, as you prefer.

This attribute is created automatically, and stores the value of $@ when the Throwable object is created. This is done on a best effort basis. $@ is subject to lots of spooky action-at-a-distance. For now, there are clearly ways that the previous exception could be lost.

  Something::Throwable->throw({ attr => $value });

This method will call new, passing all arguments along to new, and will then use the created object as the only argument to "die".

If called on an object that does Throwable, the object will be rethrown.

  die Something::Throwable->new_with_previous({ attr => $value });

Constructs an exception object and return it, while trying to make sure that any values in $@ are safely stored in "previous_exception" without being stomped by evals in the construction process.

This is more reliable than calling "new" directly, but doesn't include the forced "die" in "throw".

POD ERRORS

Hey! The above document had some coding errors, which are explained below:

Around line 31:

Unknown directive: =attr

Around line 55:

Unknown directive: =method

Around line 79:

Unknown directive: =method