From: Jim Freeze <jfreeze@...>
Date: 2002-08-25T10:23:20+09:00
Subject: Re: same method as class and instance methods?

On Sun, Aug 25, 2002 at 03:40:36AM +0900, Ferenc Engard wrote:
> Hi there,
> 
> I want to use a method as a class method, but as I use it frequently in
> the classes' other methods, I do not want to prefix the method name with
> class name in these cases. Is there a language construct to use a method
> both as class and as instance methods?
> 
> Anyway, I have a workaround as defining a method like:
> 
> def methodName
>   ClassName.methodName
> end
> 
> Thanks:
> Circum

That is very clever.

class MyClass
  def meth
    self.type.meth
  end
  def self.meth
    puts "MyClass::meth"
  end
end

MyClass.meth      #=> MyClass::meth
MyClass.new.meth  #=> MyClass::meth

What about creating an attr_instance_method module like:

class Module
  def attr_instance_method(*class_methods)
    class_methods.each { |class_method|
      class_eval %{ 
        def #{class_method}
          self.type.#{class_method}
        end 
      }
    }
  end
end#attr_instance_method

So, the above would be

class MyClass
  attr_instance_method :meth
  def self.meth
    puts "MyClass::meth"
  end
end

-- 
Jim Freeze
If only I had something clever to say for my comment...
~