From: Just Another Victim of the Ambient Morality <ihatespam@...>
Date: 2007-11-29T01:55:00+09:00
Subject: Re: Ruby needs continuations...


"MonkeeSage" <MonkeeSage@gmail.com> wrote in message 
news:4f89dee4-b922-49ef-889f-e281e7ad0e8c@j44g2000hsj.googlegroups.com...
> On Nov 28, 9:19 am, MonkeeSage <MonkeeS...@gmail.com> wrote:
>> ========
>>
>> require 'generator'
>>
>> module Enumerable
>>   def izip(*enumerables)
>>     enumerables = [self] + enumerables
>>     generators = enumerables.map { | enum |
>>       Generator.new(enum)
>>     }
>>     while generators[0].next?
>>       result = generators.map { | gen |
>>         gen.next
>>       }
>>       yield result
>>     end
>>   end
>> end
>>
>> [1,2,3].izip([4,5,6]) { | x, y |
>>   puts x, y
>>
>> }
>>
>> ========
>>
>> NB. generator.rb says that generators are slow in 1.8.
>>
>> Regards,
>> Jordan
>
> Ps. The SyncEnumerator class from generator does the same thing as
> izip:
>
> SyncEnumerator.new([1,2,3], [4,5,6]).each { | x, y |
>  puts x, y
> }

    Thank you, MonkeeSage, this is exactly what I'm looking for!
    It's interesting that generators are slow enough to warn users about its 
lack of speed!  Do you know if it would be any faster implemented with 
continuations?  I'm surprised it's so slow considering Ruby employs green 
threads...