From: matz@... (Yukihiro Matsumoto)
Date: 2003-03-25T12:48:17+09:00
Subject: Re: Writing a new method in C for a subclass

Hi,

In message "Re: Writing a new method in C for a subclass"
    on 03/03/25, David King Landrith <dave@landrith.com> writes:

|I am wondering if there is anything special that I must do to create a 
|method that instantiates a new MyArray object in c.  All of the 
|examples of "new" methods (meaning a methods that are declared using 
|the form rb_define_singleton_method(myClass, "new", myClass_new, argc) 
|simply extend rb_cObj.

If you're using 1.8.0, you just need to call

  ary = rb_obj_alloc(YourArraySubclass);

to get new instance of your class.  But since allocated instance is an
empty array, you need to call rb_ary_store() to store object to
allocate internal buffer.

Making a subclass of built-in classes is more difficult than making
subclass of Object.  You may need to dig into the interpreter
source code.

							matz.