lib/optional/none.rb
module None
include Option
extend self
def each
end
def none?
true
end
def some?(type=nil)
false
end
def value
raise Option::ValueOfNoneError
end
def value_or(default=nil, &block)
block.nil? ? default : block.call
end
def & other
self
end
def | other
other
end
def to_s
"None"
end
def merge other
other
end
end