From: Richard Kilmer <rich@...>
Date: 2003-09-12T03:56:11+09:00
Subject: Re: ANN: MetaTags 1.0


On Thursday, September 11, 2003, at 01:31  AM, Martin DeMello wrote:

> Dave Thomas <Dave@pragprog.com> wrote:
>>
>> Or perhaps even using the '>>' operator (as in 'becomes' or 'inject
>> into')
>>
>>     c = "one hump or two" >> Caml
>
> Nice! And perhaps the other way around too - I notice that Class#<< is
> undefined.
>
> c = Caml << "one hump or two" (read 'from')
>
> martin
>

Oh my...improving on perfection!  You could make this type-selectable:

class Date
   def self.__String(string)
     puts "String factory"
     Date.new
   end
   def self.__Fixnum(millis)
     puts "Fixnum factory"
     Date.new
   end
end

class Class
   def <<(object)
     sym = "__#{object.class}".intern
     return send(sym, object) if respond_to?(sym)
     return nil
   end
end

d = Date << "String"
d = Date << 1234543

The generic factory pattern!