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Groups > comp.lang.ruby > #4742

Re: Generating Functions in Ruby

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Robert K. wrote in post #999483:
> On Wed, May 18, 2011 at 3:46 PM, Andreas Lundgren
> <andreas.lundgren.x@gmail.com> wrote:
>> return 5+4
>> I would like a way to generate the methods in runtime. As an old C-
>> SUM_TEMPLATE(OnePlusSeven, 1, 7)
>>
>> # Test program
>> puts("Five + Four is " + FivePlusFour().to_s)
>> puts("One + Seven is " + OnePlusSeven().to_s)
>>
>> Is this possible in Ruby?
>
> def SUM_TEMPLATE(name, x, y)
>   class <<self;self;end.class_eval "def #{name}; #{x} + #{y}; end"
> end
>

>> I need these functions to be class methods

..of what class?  Perhaps something like this:


def SUM_TEMPLATE(the_class, meth_name, x, y)
  class_obj = Object.const_get(the_class)

  class_obj.singleton_class.class_eval do
    define_method(meth_name) do
      x + y
    end
  end
end


class Dog
end

SUM_TEMPLATE('Dog', 'FivePlusFour', 5, 4)
puts Dog.FivePlusFour

--output:--
9

-- 
Posted via http://www.ruby-forum.com/.

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Generating Functions in Ruby Andreas Lundgren <andreas.lundgren.x@gmail.com> - 2011-05-18 06:44 -0700
  Re: Generating Functions in Ruby Steve Klabnik <steve@steveklabnik.com> - 2011-05-18 09:34 -0500
  Re: Generating Functions in Ruby Robert Klemme <shortcutter@googlemail.com> - 2011-05-18 09:54 -0500
    Re: Generating Functions in Ruby 7stud -- <bbxx789_05ss@yahoo.com> - 2011-05-18 14:44 -0500
    Re: Generating Functions in Ruby 7stud -- <bbxx789_05ss@yahoo.com> - 2011-05-18 20:55 -0500
      Re: Generating Functions in Ruby Robert Klemme <shortcutter@googlemail.com> - 2011-05-19 08:31 +0200
        Re: Generating Functions in Ruby 7stud -- <bbxx789_05ss@yahoo.com> - 2011-05-19 13:00 -0500
          Re: Generating Functions in Ruby Robert Klemme <shortcutter@googlemail.com> - 2011-05-20 01:28 -0500
            Re: Generating Functions in Ruby Andreas Lundgren <andreas.lundgren.x@gmail.com> - 2011-05-23 05:54 -0700
              Re: Generating Functions in Ruby 7stud -- <bbxx789_05ss@yahoo.com> - 2011-05-23 16:25 -0500
  Re: Generating Functions in Ruby Thomas Preymesser <thopre@gmail.com> - 2011-05-19 04:35 -0500
  Re: Generating Functions in Ruby Brian Candler <b.candler@pobox.com> - 2011-05-19 10:06 -0500
  Re: Generating Functions in Ruby 7stud -- <bbxx789_05ss@yahoo.com> - 2011-05-23 16:09 -0500
  Re: Generating Functions in Ruby 7stud -- <bbxx789_05ss@yahoo.com> - 2011-05-23 20:51 -0500
  Re: Generating Functions in Ruby 7stud -- <bbxx789_05ss@yahoo.com> - 2011-05-23 21:07 -0500
    Re: Generating Functions in Ruby Andreas Lundgren <andreas.lundgren.x@gmail.com> - 2011-05-24 00:10 -0700
      Re: Generating Functions in Ruby Andreas Lundgren <andreas.lundgren.x@gmail.com> - 2011-05-24 00:24 -0700
        Re: Generating Functions in Ruby Brian Candler <b.candler@pobox.com> - 2011-05-24 03:12 -0500
        Re: Generating Functions in Ruby Robert Klemme <shortcutter@googlemail.com> - 2011-05-24 03:39 -0500
          Re: Generating Functions in Ruby Andreas Lundgren <andreas.lundgren.x@gmail.com> - 2011-05-24 06:46 -0700
            Re: Generating Functions in Ruby Robert Klemme <shortcutter@googlemail.com> - 2011-05-24 10:20 -0500
      Re: Generating Functions in Ruby 7stud -- <bbxx789_05ss@yahoo.com> - 2011-05-24 17:27 -0500
        Re: Generating Functions in Ruby 7stud -- <bbxx789_05ss@yahoo.com> - 2011-05-24 17:53 -0500
          Re: Generating Functions in Ruby Andreas Lundgren <andreas.lundgren.x@gmail.com> - 2011-05-25 03:59 -0700
            Re: Generating Functions in Ruby 7stud -- <bbxx789_05ss@yahoo.com> - 2011-05-25 12:26 -0500
            Re: Generating Functions in Ruby 7stud -- <bbxx789_05ss@yahoo.com> - 2011-05-25 17:12 -0500
              Re: Generating Functions in Ruby Andreas Lundgren <andreas.lundgren.x@gmail.com> - 2011-05-27 04:48 -0700
  Re: Generating Functions in Ruby 7stud -- <bbxx789_05ss@yahoo.com> - 2011-05-24 16:54 -0500

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