How do I get the class of a BasicObject instance?

Question

I have a script that iterates using ObjectSpace#each_object with no args. Then it prints how many instances exist for each class.

I realized that some

Answer 1

I don't know about doing it in Ruby, but this is straightforward using the C API to Ruby. The RubyInline Gem makes adding bits of C to your Ruby code quite easy:

require 'inline'
class Example
  inline do |builder|  
    builder.c_raw_singleton < 1
      VALUE true_class(VALUE self, VALUE to_test) {
        return rb_obj_class(to_test);
      }
SRC
   end
end

And then:

1.9.2p180 :033 > Example.true_class(20.minutes)
 => ActiveSupport::Duration