From: Dave Mihalik <dmihalik@...>
Date: 2006-07-28T05:52:08+09:00
Subject: Re: Prevent class instantiation from the initialize method?


>That said, using exceptions for control flow is usually a bit of
> pathological case in Ruby, and there's usually a better way to
> accomplish the same result.  The two possible answers that spring to
> mind are (simple) making the initialiser private or (slightly more
> complicated) just removing the new method all together:


I am trying to determine how my program should handle errors in the 
initialize method.  If an error occurs in code that is running in the 
initialize method, I want to be able to prevent the class from 
instantiating.


class Testclass
  def initialize()

    ## Do work here.
    ## Do more work here.
    ## Get an error from doing more work.

    ## Raise an error to prevent the class from instantiating because
    ## the functionality of the class depends on the above work.

    ##raise "Instantiation cancelled."

  end
end

## Try to instantiate the class.
begin

   mytest = Testclass.new()

   ## Make sure that the instantiation was successful.
   rescue Exception => e

      ## If not, handle the error.
      puts e
      exit 1

end

## If instantiation succeeded, then proceed with the program.
puts "Instantiation not cancelled."

Is there a better way to handle errors in the initialize method?

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