From: 7stud -- <bbxx789_05ss@...>
Date: 2011-04-20T02:36:55+09:00
Subject: Re: How to use Enumerator::Generator in Ruby 1.9.2

Joey Zhou wrote in post #993744:
> e = Enumerator.new do |y|
>   y << 1
> end
>
> p e #=> #<Enumerator: #<Enumerator::Generator:0x1345b00>:each>
>
> well, it seems that e is an Enumerator, but has an Enumerator::Generator
> in it. I am confused what on earth Enumerator::Generator is.
>

It's that y thing, and it knows how to provide values to the enumerator 
when your code requests values from the enumerator.


> Can I get
> an object that can return "Enumerator::Generator" if I type "obj.class"?
>

Let's see:

1)
obj = Enumerator::Generator.new
puts obj.class

--output:--
prog.rb:1:in `initialize': no block given (LocalJumpError)
  from prog.rb:1:in `new'
  from prog.rb:1:in `<main>'

2)
obj = Enumerator::Generator.new do |y|
  y << 1
end

puts obj.class

--output:--
Enumerator::Generator

There you go.

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