From: Tobias Reif <tobiasreif@...>
Date: 2001-11-27T02:26:05+09:00
Subject: [ruby-talk:26530] Re: from_to, upto (recurse, yield)

Paul Brannan wrote:


> You are not passing a block to from_to when you call it recursively.  Try
> this:
> 
> def from_to first,last,&block


Thanks!

This
-----
def upto limit,current=0,&block
   yield current
   if not current >= limit
     upto limit,current.succ,&block
   end
end

upto(632) do |integer|
   puts integer
end
-----

works.

But with 633, I get
-----
632
rec.rb:32:in `puts': stack level too deep (SystemStackError)
         from rec.rb:32
         from rec.rb:31:in `upto'
         from rec.rb:27:in `upto'
         from rec.rb:27:in `upto'
         from rec.rb:27:in `upto'
         from rec.rb:27:in `upto'
         from rec.rb:27:in `upto'
         from rec.rb:27:in `upto'
          ... 624 levels...
         from rec.rb:27:in `upto'
         from rec.rb:27:in `upto'
         from rec.rb:27:in `upto'
         from rec.rb:31
633
-----

ruby 1.6.5 (2001-09-19) [i386-cygwin]

Is there a way to prevent this in recursion?

Tobi

-- 
Tobias Reif
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