From: Tim Hunter <cyclists@...>
Date: 2002-10-21T08:52:13+09:00
Subject: rb_class_new_instance question

ruby 1.6.7 (2002-03-01) [i686-linux]


I have a class that is a subclass of Array:

class MyClass < Array
   attr_accessor :scene
   def initialize
      @scene = nil
   end
end

This works fine when I create a new instance from Ruby code:

m = MyClass.new
p m.length -> 0
p m.scene -> nil

However, if I create a new instance from C using rb_class_new_instance, 
the statement "@scene = nil" causes the length attribute to become a 
very large value. self.length may be 135674608, for example (but it's 
not necessarily the same from time to time).

Everything else about the instance looks right.

Under the debugger I can watch the call to MyClass#initialize from
rb_class_new_instance. On entry, just prior to the "@scene = nil" 
statement, self.length is 0 as expected. Just after the statement it's 
bogus.

Any ideas? What am I doing wrong?

TIA!