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Re: How to use Enumerator::Generator in Ruby 1.9.2

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From 7stud -- <bbxx789_05ss@yahoo.com>
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Subject Re: How to use Enumerator::Generator in Ruby 1.9.2
Date Tue, 19 Apr 2011 12:36:55 -0500
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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.

-- 
Posted via http://www.ruby-forum.com/.

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Thread

How to use Enumerator::Generator in Ruby 1.9.2 Joey Zhou <yimutang@gmail.com> - 2011-04-19 01:43 -0500
  Re: How to use Enumerator::Generator in Ruby 1.9.2 Robert Klemme <shortcutter@googlemail.com> - 2011-04-19 02:44 -0500
    Re: How to use Enumerator::Generator in Ruby 1.9.2 Johannes Held <johannes.held@informatik.uni-erlangen.de> - 2011-04-19 12:55 +0200
      Re: How to use Enumerator::Generator in Ruby 1.9.2 Robert Klemme <shortcutter@googlemail.com> - 2011-04-19 07:01 -0500
  Re: How to use Enumerator::Generator in Ruby 1.9.2 Joey Zhou <yimutang@gmail.com> - 2011-04-19 07:49 -0500
    Re: How to use Enumerator::Generator in Ruby 1.9.2 7stud -- <bbxx789_05ss@yahoo.com> - 2011-04-19 12:36 -0500
  Re: How to use Enumerator::Generator in Ruby 1.9.2 Joey Zhou <yimutang@gmail.com> - 2011-04-19 21:23 -0500

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