From: Luca Scaljery <lcalje@...>
Date: 2008-06-23T05:56:04+09:00
Subject: extending a class

Hi All

I'm trying to add methods to a class like:

class Person
  def refresh
    p "refresh"
  end
  def dup
    P "DUP"
  end

  TIMED_M =  [:refresh, :dup]
  TIMED_M.each do  |method|
    p method
    alias_method :"#{method}_without_timing", method

    define_method :"{#method}_with_timing" do
      p "timing"
      start_time = Time.now.to_f
      returning(self.send(:"#{method}_without_timing")) do
        end_time = Time.now.to_f
        puts "#{method}: #{"%.3f" % (end_time - start_time)} s."
      end
    end
  end
end

class << Person
  def start_trace
    TIMED_M.each do |method|
      p "x"
      alias_method method, :"#{method}_with_timing"
    end
  end
end
p = Person.new
p.refresh
Person.start_trace
p.refresh

For some unknown reason I get the following error:
:refresh
:dup
"refresh"
./t2.rb:31:in `start_trace': uninitialized constant Class::TIMED_METHODS
(NameError)
  from ./t2.rb:39

Any suggestions why I get this error ?

thnx a lot
LuCa
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