Clonable provides a standard basis for adding deep cloneablity to a class via the standard dup and clone methods.
Cloneable was originally ported from Jim Weirich's Rake. The current version is the work of Ken Bloom.
CREDIT: Ken Bloom
# File lib/facets/cloneable.rb, line 11 def initialize_copy(sibling) #first duplicate my superclass' state. Note that if it's duplicating #instance variables, this will be overwritten, but this is important #because we could be dealing with a C extension with state hidden from #the Ruby interpreter super #we want to know if we're being dup'ed or clone'd, because we want to #preserve the state of our internals the same way our state is being #preserved. (If we can't figure it out, we'll just use #dup.) operation = ( copy_call = caller.find{|x| x !~ /'initialize_copy'/} copy_match = copy_call.match(/`(dup|clone)'/) copy_match ? copy_match[1] : :dup ) sibling.instance_variables.each do |ivar| value = sibling.instance_variable_get(ivar) #set my instance variable to be a #dup or #clone #or my sibling, depending on what's happening to me right now instance_variable_set(ivar, value.send(operation)) end end
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