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Template::Plugin::Assert(3)    User Contributed Perl Documentation    Template::Plugin::Assert(3)

       Template::Plugin::Assert - trap undefined values

	   [% USE assert %]

	   # throws error if any undefined values are returned
	   [% object.assert.method %]
	   [% hash.assert.key %]
	   [% list.assert.item %]

       This plugin defines the "assert" virtual method that can be used to automatically throw
       errors when undefined values are used.

       For example, consider this dotop:

	   [% user.name %]

       If "user.name" is an undefined value then TT will silently ignore the fact and print
       nothing.  If you "USE" the "assert" plugin then you can add the "assert" vmethod between
       the "user" and "name" elements, like so:

	   [% user.assert.name %]

       Now, if "user.name" is an undefined value, an exception will be thrown:

	   assert error - undefined value for name

       Andy Wardley <abw@wardley.org> <http://wardley.org/>

       Copyright (C) 2008 Andy Wardley.  All Rights Reserved.

       This module is free software; you can redistribute it and/or modify it under the same
       terms as Perl itself.


perl v5.16.3				    2011-12-20		      Template::Plugin::Assert(3)
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