Re: [boost] [Reminder][Review] The review of theBoost.Guidlibrarystarts today (April 30th)

From: Andy (atompkins_at_[hidden])
Date: 2007-05-08 14:21:24

"Peter Dimov" <pdimov_at_[hidden]> wrote in
news:01c201c7919b$0a73fb40$6407a80a_at_pdimov2: 

> Andy wrote:
>> "Peter Dimov" <pdimov_at_[hidden]> wrote in
>> news:00b601c790ad$8e357b00$6407a80a_at_pdimov2:
>> 
>>> null()/nil() are actually redundant and only contribute thread
>>> safety problems. The default constructor already creates a NULL
>>> UUID, as it should.
>> 
>> I agree that they are redundant.  I am not pushing them, but just
>> wondering why they would contribute to thread safety problems since
>> they return a constant object?
> 
> Because of the local static variable.

Ah!  Multiple threads may try to initialize the variable at the same time.  
If it could be initialized correctly, there wouldn't be a problem.

Thanks.
  Andy.