From: ts <decoux@...>
Date: 2002-09-20T02:15:25+09:00
Subject: Re: alias/method redfinition

>>>>> "a" == ara howard <ahoward@fsl.noaa.gov> writes:

a>       m = Module.new
a>       m.module_eval %q{

 You use #eval which is evil

   module M
      def [] idx 
         if @fields and idx.type == String
            pos = @fieldpos[idx]
            return nil unless pos
            self[pos]
         else
            super
         end
      end
      def []= idx, value 
         if @fields and idx.type == String
            pos = @fieldpos[idx]
            if not pos
               pos = size
               @fieldpos[idx] = pos
            end
            self[pos] = value
         else
            super
         end
      end
   end
   
   class Array
      def fields=(*fields)
         extend M unless @fields
         @fields = fields.flatten 
         @fieldpos = Hash.new
         @fields.each_with_index {|f,i| @fieldpos[f] = i}
      end
      attr_reader :fields
      attr_reader :fieldpos
   end


Guy Decoux