From: Johan Holmberg <holmberg@...>
Date: 2004-01-16T05:22:47+09:00
Subject: Re: Concatenating variable number of Arrays ?


On Fri, 16 Jan 2004, Florian Frank wrote:
> On 2004-01-16 00:03:39 +0900, Johan Holmberg wrote:
[...]
>
> > I agree.
> > Where can I read about 'to_proc' and how it works ?
>
> This trick uses the function block_pass in eval.c. If you pass an object
> with & operator to a method, a conversion to a Proc object is attempted
> in this function, by calling to_proc on this object. Usually there are
> only Method and Proc objects in Ruby that implement this method. But you
> can also define your own classes with to_proc if you like. Actually it's
> an application of duck typing.
>

Thanks for the explanation.
Is this documented somewhere or have you found out by reading the
code ?

One thing I wonder is if the 'Symbol.to_proc' method you described
is too global. What if we would like to define the method in a
different way somewhere else ?

Or is it poosible to define 'Symbol.to_proc' in a natural way ?
And in that case, why isn't it already built into Ruby ?

/Johan Holmberg