From: black eyes <black.eyes.cn@...>
Date: 2008-08-21T23:46:10+09:00
Subject: Re: Find all subclasses of a class/module


the following are code in http://gist.github.com/6560

class Module
  def subclasses
    classes = []
    ObjectSpace.each_object do |klass|
      next unless Module === klass
      classes << klass if self > klass
    end
    classes
  end
end

I think the above code is good! but considering the class and module are 
referenced by constants in ruby, use Module.constants is more naturally!
the following are mine!

the key is to get rid of the real constant such as PI and so on.

def find_children p_klass
  Module.constants.find_all{|c_klass| c_klass!=c_klass.upcase ? p_klass 
> (Object.const_get c_klass) : nil}
end

# test!

class MyString < String
end

puts find_children( String)                   #=> MyString


require 'benchmark'
include Benchmark

puts find_children(Benchmark).include?(Tms)   #=> fase
puts Tms.name                                 #=> Benchmark::Tms
puts find_children(Benchmark).include?("Tms") #=> true

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