get_enumerator_method.rb

# In response to this question http://stackoverflow.com/questions/21899007/get-enumerator-method

require 'dl'

enum = [1,2,3].reject

enum_ptr = DL::CPtr.to_ptr(enum.object_id << 1)

rdata_struct = enum_ptr[0, DL::SIZEOF_LONG * 5].unpack('Q5')

enum_struct_ptr = DL::CPtr.to_ptr(rdata_struct.last)

enum_struct = enum_struct_ptr[0, DL::SIZEOF_LONG * 8].unpack('Q8')

libruby = DL.dlopen('libruby.so')

id2str_cfunc = DL::CFunc.new(libruby['rb_id2str'], DL::TYPE_VOIDP, 'rb_id2str')

str_ptr = id2str_cfunc.call([enum_struct[1]])

puts DL::CPtr.to_ptr(str_ptr).to_value # => reject