From: "Mauricio Fernández" <batsman.geo@...>
Date: 2004-07-13T07:47:29+09:00
Subject: Re: Problems creating a method to define a class with its method

On Tue, Jul 13, 2004 at 07:22:27AM +0900, Benny wrote:
>  def My_Module.subclass(name, &code)
>   eval <<-EOS
>     class #{name} < Bigclass   
>       def #{name}.run(p)
>         super(p)                
>        #{code.call}
>       end
>     end
>   EOS
>  end
> end
[...]
> the problem is that the #{code.call} is executed before
> the class is defined, so @test isn't filled yet (super(p) 
> isn't executed at this time.
> 
> how can I change the code, so that �code� is part of the definition
> of the class (i.e. part of its method �run�)

batsman@tux-chan:/tmp$ cat ghfdgh54yiyh.rb
module My_Module
    class Bigclass
        attr_accessor :test
        def Bigclass.run(para)
            @test = para
            puts "your parameter is " + @test
        end
        def Bigclass.check
            puts "I'm here"
        end
    end

    def My_Module.subclass(name, &code)
        k = Class.new(Bigclass)
        class << k; self end.send(:define_method, "run") do |p|
            super(p)
            instance_eval(&code)
        end
        My_Module.const_set(name, k)
        k
    end
end

My_Module.subclass("Newclass") do
    puts "does work work now: " + @test.to_s
    check
end

My_Module::Newclass.run "blah"
batsman@tux-chan:/tmp$ ruby ghfdgh54yiyh.rb
your parameter is blah
does work work now: blah
I'm here

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