From: dblack@...
Date: 2007-08-04T21:23:14+09:00
Subject: Re: Object.private_instance_methods  <--- Kernel.singleton_methods

Hi --

On Sat, 4 Aug 2007, ronald braswell wrote:

> How do the Kernel.singleton_methods get to be 
> Object.private_instance_methods?

Following the trail in eval.c and class.c, it looks like they're bound
to Ruby names with rb_define_global_function:

     rb_define_global_function("raise", rb_f_raise, -1);

That, in turn, calls rb_define_module_function for Kernel, which
establishes the method as (a) a singleton method of Kernel itself, and
(b) a private instance method of Kernel.

The private instance methods then trickle down.  You can see them not
only with Object but with other classes too:

Class.new.private_instance_methods == Object.private_instance_methods
=> true


David

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