= WebGet.com Ruby Class#defining and #redefining metaprogramming methods

Author:: Joel Parker Henderson, joelparkerhenderson@gmail.com
Copyright:: Copyright (c) 2009 Joel Parker Henderson
Licenese:: CreativeCommons License, Non-commercial Share Alike
License:: LGPL, GNU Lesser General Public License

Meta-programming method that you call when you are defining
a class method, to detect if your class may be accidentally
overriding an existing method.

==Example
  require 'defining'

  class MyClass

    # raise an error if 'foo' is already a method
    defining 'foo'

    # raise an error if 'to_s' is NOT already a method
    redefining 'to_s'

    # you can check many names at once
    defining 'foo', 'goo', 'hoo', 
    redefining 'to_s', 'equal?', 'clone'

  end