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From: 7stud -- <bbxx789_05ss@yahoo.com>
Newsgroups: comp.lang.ruby
Subject: Re: Generating Functions in Ruby
Date: Wed, 18 May 2011 14:44:45 -0500
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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

-- 
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