From: Daniel Mendler <dmendler@...>
Date: 2008-03-07T03:51:57+09:00
Subject: Re: Double colon vs module block

Trans schrieb:
> On Mar 6, 1:21 pm, Daniel Mendler <dmend...@wurzelteiler.de> wrote:
>   
>> Hi!
>>
>> I am new to ruby. I have a question concerning namespaces. Is there a
>> difference between using the double colon operator or a module block?
>> Example:
>>
>> module Library
>>   class Book
>>   end
>> end
>>
>> vs.
>>
>> class Library::Book
>> end
>>     
>
> The later will give an error if Library isn't yet defined (personally
> I with is would just auto-instantiate a new module). Also the lookup
> of constants resolves differently. For example:
>
>   module Library
>     SOMETHING = "whatever"
>   end
>
>   class Library::Book
>     SOMETHING  #=> NameError: uninitialized constant
>   end
>
> But I _think_ this has been fixed in Ruby 1.9... Can someone confirm
> that?
>
> T.
>
>   
That's exactly the exception I got. Can you explain why this happens?

--
Daniel