From: matz@... (Yukihiro Matsumoto)
Date: 2004-03-03T08:00:09+09:00
Subject: Re: concerns about Proc,lambda,block

Hi,

In message "Re: concerns about Proc,lambda,block"
    on 04/03/02, Austin Ziegler <austin@halostatue.ca> writes:

|Will there be a way to convert proc-style to block-style handling and
|vice-versa?

proc to lambda

  lambda{|*args| proc.call(*args)}

lambda to proc

  Proc.new{|*args| lambda.call(*args)}

Conceptually, lambda is a Proc wrapped by argument checker and
break/return handler.

  def lambda(&block)
    Proc.new{|*args|
      ... check number of arguments to block
      begin
        block.call(*args)
      rescue LocalJumpError
        ..terminate lambda execution by return/break
      end
    }
  end

							matz.