From: Robert Klemme <shortcutter@...>
Date: 2009-10-09T05:40:11+09:00
Subject: Re: Mixing instance_eval and block with arguments

On 10/08/2009 09:21 PM, Tony Arcieri wrote:
> [Note:  parts of this message were removed to make it a legal post.]
> 
> On Thu, Oct 8, 2009 at 10:04 AM, Robert Klemme
> <shortcutter@googlemail.com>wrote:
> 
>> In other words: I like to define a block as an initializer which I can
>> store away somewhere and invoke that initializer later on in the
>> context of "self" and pass arguments at the same time.  Any ideas how
>> I can accomplish this elegantly?
>>
> 
> Sounds like you need instance_exec, which is a 1.9 feature but there are
> implementations for 1.8:
> 
> http://eigenclass.org/hiki.rb?instance_exec

1.9 is OK.

irb(main):001:0> l = lambda {|a| self + a}
=> #<Proc:0x9f5cfe0@(irb):1 (lambda)>
irb(main):002:0> 1.instance_exec(2,&l)
=> 3

Perfect!  This is _exactly_ what I need.  Thanks a bunch!

This article is so old, I can't believe I missed this completely. 
Amazing: learn something new every day.

Kind regards

	robert

-- 
remember.guy do |as, often| as.you_can - without end
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