From: Ruhe <nocturneer@...>
Date: 2008-04-02T19:35:04+09:00
Subject: Re: MetaMonster

On 1 Сав, 12:42, Robert Klemme <shortcut...@googlemail.com> wrote:
>
> >  PS
> >  I understand that this is a bad way to build class,
> >  I did it to get new skills in metaprogramming, not for real-world use.
>
> Here are my 0.02EUR:
>
> Make create and others class instance methods instead of instance
> methods.  You do not need the instance for anything else than creating
> classes so it's obsolete.  At least it should not be visible from the
> outside.
>
> You could save some typing by integrating this with Struct, i.e. let
> Struct do all that it does already and only add mathematic methods,
> like
>
> class Vector
>   def self.new(*syms)
>     cl = Struct.new(*syms)
>     # add math instance methods to cl
>     cl
>   end
> end
>
> I'd probably also generate the method code and class_eval it vs. using
> instance_variable_set and *get because that code is likely faster and
> you do not need a closure, e.g.
>
>     %w{+ -}.each do |op|
>       cl.class_eval = %Q{
>         def #{op}(other)
>           self.class.new(#{syms.map {|s| "self.#{s} #{op}
> other.#{s}"}.join(', ')})
>         end
>       }
>     end
>
> Ah, and why the many empty lines?  Or is this just a pasting artifact?
>
> Kind regards
>
> robert
>
> --
> use.inject do |as, often| as.you_can - without end



Thank you, Robert, for response.
Your 0.02EUR are 100EUR for me :)