From: Joel VanderWerf <vjoel@...>
Date: 2008-10-23T08:29:47+09:00
Subject: Re: neatest way to extend Struct

Martin DeMello wrote:
> I want a Structlike class that takes a hash constructor, so I can say
> 
> class A < MyStruct.new(*keys); end
> 
> a = A.new(:key1 => val1, :key2 => val2)
> 
> Is there any way to base this off Struct?
> 
> martin

Something based on this, maybe? I hope Struct#members preserves order...

class A < Struct.new(:a, :b)
   def initialize(h)
     super *h.values_at(*self.class.members.map {|s| s.intern})
   end
end

a = A.new(:a => 1, :b => 2)
p a # ==> #<struct A a=1, b=2>

-- 
       vjoel : Joel VanderWerf : path berkeley edu : 510 665 3407