# File lib/naught/conversions.rb, line 45 def Actual(object = nil) object = yield if block_given? case object when NullObjectTag nil else object end end
# File lib/naught/conversions.rb, line 35 def Just(object = nil) object = yield if block_given? case object when NullObjectTag, *@@null_equivs fail ArgumentError, "Null value: #{object.inspect}" else object end end
# File lib/naught/conversions.rb, line 23 def Maybe(object = nil) object = yield if block_given? case object when NullObjectTag object when *@@null_equivs @@null_class.get(:caller => caller(1)) else object end end
# File lib/naught/conversions.rb, line 12 def Null(object = :nothing_passed) case object when NullObjectTag object when :nothing_passed, *@@null_equivs @@null_class.get(:caller => caller(1)) else fail ArgumentError, "#{object.inspect} is not null!" end end
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