From: Sean O'Halpin <sean.ohalpin@...>
Date: 2006-07-08T02:47:19+09:00
Subject: Re: instance_exec

On 7/7/06, Marcel Molina Jr. <marcel@vernix.org> wrote:
> On Sat, Jul 08, 2006 at 02:22:31AM +0900, ara.t.howard@noaa.gov wrote:
> >
> > i seems to recall someone came up with an impl of instance_exec
> > (instance_eval
> > that takes args) a while back - might have even been me! ;-)  anyone
> > remember?
>
> There is one in Rails' ActiveSupport:
>
> class Object
>   unless defined? instance_exec # 1.9
>     def instance_exec(*arguments, &block)
>       block.bind(self)[*arguments]
>     end
>   end
> end
>
> class Proc
>   def bind(object)
>     block, time = self, Time.now
>     (class << object; self end).class_eval do
>       method_name = "__bind_#{time.to_i}_#{time.usec}"
>       define_method(method_name, &block)
>       method = instance_method(method_name)
>       remove_method(method_name)
>       method
>     end.bind(object)
>   end
> end
>
> marcel
> --
> Marcel Molina Jr. <marcel@vernix.org>
>
>
This is not thread-safe - relying on time.usec may not work on
sufficiently fast or clock-impaired machines.

Regards,
Sean