From: Robert Feldt <feldt@...>
Date: 2001-12-14T19:03:29+09:00
Subject: [ruby-talk:28497] Re: Get classes from file

On Fri, 14 Dec 2001, Wyss Clemens wrote:

> straight-forward-approach:
> ====
> classes_before = []
> ObjectSpace.each_object(Class) { |aClass| classes_before.push(aClass.name) }
> 
> require "test"
> 
> classes_after = []
> ObjectSpace.each_object(Class) { |aClass| classes_after.push(aClass.name) }
> 
> new_classes = classes_after - classes_before 
> ====
> 
> Pretty sure there are "righter" ways to do this...but as Kent Beck says
>     'make it run, make it right, make it fast'
> 
An alternative might be along the lines:

class Object
  @@new_classes = []

  def Object.inherited(klass)
    @@new_classes.push klass
  end

  def Object.get_new_classes
    old, @@new_classes = @@new_classes, []
    yield
    res = @@new_classes
    @@new_classes = old + @@new_classes
    res
  end
end

and then 

  new_classes = Object.get_new_classes { require 'file' }

but not thread-safe etc...

/Robert Feldt