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require "singleton"
require "naught/null_class_builder/command"
module Naught
class NullClassBuilder
module Commands
# Turns the null class into a Singleton
#
# @api private
class Singleton < Command
# Install Singleton behavior on the null class
# @return [void]
# @api private
def call
defer_class do |klass|
klass.include(::Singleton)
klass.singleton_class.undef_method(:get)
klass.define_singleton_method(:get) { |*| instance }
%i[dup clone].each { |name| klass.define_method(name) { self } }
end
end
end
end
end
end
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