# Class Metric: Number of nullables MAttributes
class CNBNA
	super MClassMetric
	super IntMetric
	redef fun name do return "cnbna"
	redef fun desc do return "number of accessible nullable attributes (inherited + local)"

	redef fun collect(mclasses) do
		for mclass in mclasses do
			var all = mclass.collect_accessible_mattributes(mainmodule, filter)
			for mattr in all do
				if mattr.is_nullable then values.inc(mclass)
			end
		end
	end
end