From: ahoward <ahoward@...>
Date: 2002-11-28T02:28:29+09:00
Subject: Re: each_with_index & collect_with_index?

On Thu, 28 Nov 2002 dblack@candle.superlink.net wrote:

[snip]
D> One thing I believe is missing, conceptually speaking, is the ability
D> on the part of a proc or code block to capture a reference to itself
D> from inside itself.
[snip]

is this not what this does?

[snip]
    def initialize_fetch_block
      @index = -1
      callcc do |@after_fetch|
	@has_next = true
	@enumerable.each do |@next_element|
	  callcc do |@next_fetch| @after_fetch.call end
	end
	@has_next = false
	@next_fetch = nil
	@after_fetch.call
      end
      @after_fetch = nil
    end

    def fetch_next_element
      result = @next_element
      @index = @index + 1
      callcc do |@after_fetch| @next_fetch.call end
      @after_fetch = nil
      result
    end
[snip]

@next_fetch and @after_fetch are referencess to blocks captured from inside
blocks?

-a

-- 

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 | Ara Howard
 | NOAA Forecast Systems Laboratory
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 | Data Systems Group
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 | Email: ahoward@fsl.noaa.gov
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