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module Morpher
class Evaluator
class Transformer
# Identity transformer which always returns +input+
class Input < self
include Nullary, Transitive
register :input
# Call evaluator with input
#
# @param [Object] input
#
# @return [Object]
# always returns input
#
# @api private
#
def call(input)
input
end
# Return inverse evaluator
#
# @return [Evaluator::Transformer]
#
# @api private
#
def inverse
self
end
end # Input
end # Transformer
end # Evaluator
end # Morpher
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