From: Eero Saynatkari <eero.saynatkari@...>
Date: 2006-09-02T08:53:09+09:00
Subject: Re: Re-binding Proc

Phrogz wrote:
> Is there a way to call a proc while passing in the binding/scope for
> 'self'? I found an un-responded-to question on this (ruby-talk:12794)
> in 2001 which implies that, at least then, there was no way to do it.

I may be just feeling light-headed from COBOL, but
would #instance_eval not work here?

> What I'm doing:
> class Foo
>   @@handlers = {}
> 
>   def self.handle_type( type, &proc )
>     @@handlers[ type ] = proc
>   end
> 
>   attr_reader :name
>   def initialize( name )
>     @name = name
>   end
> 
>   def do_thing( type )
>     @@handlers[ type ].call( self )

      instance_eval &@@handlers[type]

>   end
> end
> 
> Foo.handle_type( :showname ){ |me|
>   puts "My name is '#{me.name}'"
> }

  Foo.handle_type(:showname) {puts "My name is #{self.name}"}

> f = Foo.new( 'f' )
> f.do_thing( :showname )
> #=> My name is 'f'
> 
> 
> What I'd like to do instead:
> 
> Foo.handle_type( :showname ){
>   puts "My name is '#{self.name}'"
> }


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