Sha256: 2bf4c8fe06cee67c58d6b1f5e2ffcf62bc9e9eaff8b31e263c4d4d975d795cac
Contents?: true
Size: 963 Bytes
Versions: 12
Compression:
Stored size: 963 Bytes
Contents
module Uber
module InheritableAttr
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
[Symbol, TrueClass, FalseClass, NilClass]
end
end
end
InheritableAttribute = InheritableAttr
end
Version data entries
12 entries across 12 versions & 2 rubygems