getparam.rb
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	# Test whether a given class or definition is defined
	require 'puppet/parser/functions'

	Puppet::Parser::Functions.newfunction(:getparam,
	:type => :rvalue,
	:doc => <<-'DOC'
	Takes a resource reference and name of the parameter and
	returns value of resource's parameter. Note that user defined
	resource types are evaluated lazily.

	Examples:

	# define a resource type with a parameter
	define example_resource($param) {
	}

	# declare an instance of that type
	example_resource { "example_resource_instance":
	param => "'the value we are getting in this example''"
	}

	# Because of order of evaluation, a second definition is needed
	# that will be evaluated after the first resource has been declared
	#
	define example_get_param {
	# This will notice the value of the parameter
	notice(getparam(Example_resource["example_resource_instance"], "param"))
	}

	# Declare an instance of the second resource type - this will call notice
	example_get_param { 'show_notify': }

	Would notice: 'the value we are getting in this example'

	Note that since Puppet 4.0.0 it is possible to get a parameter value by using its data type
	and the [ ] operator. The example below is equivalent to a call to getparam():

	Example_resource['example_resource_instance']['param']

	DOC
	) do \|vals\|
	reference, param = vals
	raise(ArgumentError, 'Must specify a reference') unless reference
	raise(ArgumentError, 'Must specify name of a parameter') unless param && param.instance_of?(String)

	return '' if param.empty?

	resource = findresource(reference.to_s)
	if resource
	return resource[param] unless resource[param].nil?
	end

	return ''
	end

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