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Contents
module QueueClassicPlus
# From https://github.com/apotonick/uber/blob/master/lib/uber/inheritable_attr.rb which is MIT license
module InheritableAttribute
def inheritable_attr(name)
instance_eval %Q{
def #{name}=(v)
@#{name} = v
end
def #{name}
return @#{name} if instance_variable_defined?(:@#{name})
@#{name} = InheritableAttribute.inherit_for(self, :#{name})
end
}
end
def self.inherit_for(klass, name)
return unless klass.superclass.respond_to?(name)
value = klass.superclass.send(name) # could be nil.
Clone.(value) # this could be dynamic, allowing other inheritance strategies.
end
class Clone
# The second argument allows injecting more types.
def self.call(value, uncloneable=uncloneable())
uncloneable.each { |klass| return value if value.kind_of?(klass) }
value.clone
end
def self.uncloneable
tmp = [Symbol, TrueClass, FalseClass, NilClass]
tmp += [Fixnum, Bignum] if RUBY_VERSION < '2.4.0'
tmp
end
end
end
end
Version data entries
17 entries across 17 versions & 1 rubygems