From: Alber Eric <alberthier@...>
Date: 2006-12-16T01:00:16+09:00
Subject: Re: using Proc and yield

OK, thank you for your quick answer

I will just expose what I'm trying to do : I have four differents 
methods that are yielding strings. I want to use one or the other 
depending on the context but the rest of the process is the same, so I 
wrote something like that

p1 = nil
p2 = nil

# First argument handling
case arg1
when 1
    p1 = Proc.new { methodI   { |s| yield s } }
when 2
    p1 = Proc.new { methodII  { |s| yield ("foo-" + s + "-bar") } }
end

# Second argument handling
case arg2
when 3
    p2 = Proc.new { methodIII { |s| yield s } }
when 4
    p1 = Proc.new { methodIV  { |s| yield ("oof-" + s + "-rab") } }
end

p1.call { |i|
    p2.call { |j|
         process(i)
    }
}

What I'm looking for is a sort of function pointer.

Thanks

Eric

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