From: "Florian Groß" <florgro@...>
Date: 2005-04-27T01:36:45+09:00
Subject: Re: Announcing Reg 0.4.0

David A. Black wrote:

> extending the system so that it could match, for example,
> "an array of objects that respond to '[]'" (or something along those
> lines)?

I wonder if he could just support objects that implement === which would 
give you Range and Module support and ruby-contract support for free.

But how is this related to your quote at all? ruby-contract offers a 
Check::Quack[:message] adaptor that implements === via respond_to?() -- 
I wonder if it would be a good idea to define Symbol#=== which would be 
used like this:

first = case obj
   when :first then
     obj.first
   when :fetch then
     obj.fetch(0)
   when :at then
     obj.at(0)
   when :[] then
     obj[0]
end

Or in combination with ruby-contract's signature():

class IO
   def pretty_output(*objs)
     objs.each do |obj|
       puts obj.pretty
     end
   end

   signature :pretty_output, :repeated => :pretty, :block => false
end