From: Daniel Finnie <dan@...>
Date: 2008-05-17T08:14:46+09:00
Subject: Re: Easy way to use "self" in Proc

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Hi,

It is possible.  You need to tell the object to evaluate the proc with self
as that object like so:
>> t = Proc.new { self.length }
=> #<Proc:0xb77b7bd8@(irb):1>
>> "Furry bunny".instance_eval &t <-- note the ampersand.  This means pass
the proc as a block.
=> 11
>> [1, 2, 3].instance_eval &t
=> 3

Because self is an implicit receiver (that is, if no other reciever is
specified, self is the receiver), you can leave off self entirely:
>> t = Proc.new { length }
=> #<Proc:0xb77ad6ec@(irb):5>
>> [1, 2, 3].instance_eval &t
=> 3
>> "Furry bunny".instance_eval &t
=> 11

Dan


On Fri, May 16, 2008 at 6:59 PM, Leon Bogaert <leon@tim-online.nl> wrote:

> Hi all,
>
> I have this piece of code: http://pastie.caboo.se/198524
> I'm trying to use the "self" context of the instanciated class in the
> Proc. I've got it working now, but isn't there a nicer way to use the
> Proc.new() without having to use the "|obj|" part?
>
> So instead of:
>
> t.code = Proc.new { |obj| obj.instance_test() }
>
> I want to use something like:
> t.code = Proc.new { self.instance_test() }
>
> I've tried some stuff but I can't / don't think I can get it working the
> second way. Does anyone have some bright ideas about solving this
> problem?
>
> Thanks in advance!
> Leon
> --
> Posted via http://www.ruby-forum.com/.
>
>

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