Ruby Talk wrote:
> Calling a block in a new scope is easy enough:
> 
> self.instance_eval &block
> 
> And calling a block, passing it parameters is easy enough:
> 
> block.call(*params)
> 
> But is there some way to do both? To both change the scope of evaluation
> and pass variables into the block.

Hello,

I'm not sure I fully understand the question being asked here. Can you 
provide a small bit of code to highlight what you are trying to acheive.

Do you wish to pass vaiables into the instance_eval block?

Any variables in scope when the instance_eval block is called can be 
used in the instance_eval block itself. However, if you were to pass a 
proc object into the instance_eval it would retain the context it was 
created at.

See below for an example of this.

class Test
  def initialize(arg)
    @instance_variable = arg
  end
end

test_obj = Test.new("initializing_arg")

outside = "outside instance_eval"

proc = Proc.new {|arg| puts self} #self main here

test_obj.instance_eval do
   puts @instance_variable #test_obj instance variable.
   puts outside   #any variable from outside the block can be passed in.
   puts proc #will return main rather than the object
end

Hmm, I get the feeling I have ranted about stuff that does not help you 
one bit with your question...

Get back to me with a bit more detail and hopefully I'll be able to 
help!

Cheers,

Matt.



-- 
Posted via http://www.ruby-forum.com/.