From: Enrique Comba Riepenhausen <ecomba@...>
Date: 2009-12-11T18:45:37+09:00
Subject: Re: solve this ruby problem

Hello Govinda,

your sample program does not have any error as such.

The message you are getting is a warning that Object#id is going to be deprecated in future Ruby versions and you should consider using Object#object_id instead so that your program will run in latter versions.

For more on Singletons you can refer to:

- http://en.wikipedia.org/wiki/Singleton_pattern

Basically in Ruby implementing a singleton is as simple as (inside of IRB):

>> require 'singleton'
=> true
>> class MyLogger
>> include Singleton
>> end
=> MyLogger
>> MyLogger.new
NoMethodError: private method `new' called for MyLogger:Class
	from (irb):5
>> MyLogger.instance
=> #<MyLogger:0x1011b5808>
>>

Hope this helps.

Enrique

On 11 Dec 2009, at 09:22, Govinda Khanal wrote:

> below are the command and the error shows by complier:
> 
> 
> class MyLogger
>  private_class_method :new
>  @@logger = nil
>  def MyLogger.create
>    @@logger = new unless @@logger
>    @@logger
>  end
> end
> MyLogger.create.id
> 
> 
> 
> 
> the error is like this
> 
> 1.rb:9: warning: Object#id will be deprecated; use Object#object_id
> 
> 
> thank you for you help
> and i want to know more about Singletons
> -- 
> Posted via http://www.ruby-forum.com/.
>