DISQUS

Charles Oliver Nutter · 1 year ago

This isn't a factor of being implemented in Ruby; rather, it's a factor of having access to all internals as normal objects. And although MRI doesn't provide that capability, JRuby does:

<pre>
require 'java'
require 'jruby'

def examine(obj)
real = JRuby.reference(obj)
realclass = JRuby.reference(real.meta_class)
while realclass
p realclass
break unless realclass.super_class
realclass = JRuby.reference(realclass.super_class)
end
end

object = Class.new { def foo; 'foo from object'; end }.new
mixin = Module.new { def foo; 'foo from mixin'; end }

object.extend(mixin)
examine(object)
</pre>

In JRuby, as in Rubinius, all objects can be accessed as "just objects". So the same capabilities apply.