From: Martin Coxall <pseudo.meta@...>
Date: 2006-09-29T01:09:12+09:00
Subject: define_method confusery

------=_Part_46506_9829743.1159459749588
Content-Type: text/plain; charset=ISO-8859-1; format=flowed
Content-Transfer-Encoding: 7bit
Content-Disposition: inline

So I have some code which adds a method to a class based on user input like
this:

----------------------------------------------------------------

class Klass
 # Do nowt originally
end

# Get the name of a method to add
puts "Enter the name of the method to add"
$stdout.flush

methodName = gets
methodName.chomp!

puts "Adding method #{methodName}"
$stdout.flush

# Add a method called 'methodName' to Klass
Klass.class_eval do
  define_method(methodName) do |*values|
    puts "Welcome to #{methodName}!"
    puts values.to_s
  end
end

# Try to invoke the new method
instance = Klass.new
instance.send(methodName, "---", "+++")

# List the methods of Klass
Klass.methods.sort.each do |method|
  puts "Klass##{methodName}"
end

----------------------------------------------------------------

So, the code appears to work fine, in that the send() method is able to call
the newly created method. So, does anyone know why is it when I list the
methods of the class Klass afterwards, the new method does not appear?

Also, is it possible to use define_method() to add class methods to classes,
rather than just instance methods? I can't seem to get it to work.

Regards,

Martin

------=_Part_46506_9829743.1159459749588--