Re: [boost] [thread] Expected behaviour of condition variable waitwhen the mutex is not locked

From: Peter Dimov (pdimov_at_[hidden])
Date: 2008-05-08 10:03:50

Frank Mori Hess:
> On Thursday 08 May 2008 04:51 am, Anthony Williams wrote:
>> To this end, unique_lock is default-constructible and movable, and 
>> supports
>> lock and unlock operations.
>
> Since when is unique_lock default-constructible?  You just mean it has a
> defer_lock_t constructor, right?

It does have a default constructor. Movable types have to have an "empty" 
state in which to put the moved-from source, and the default constructor of 
a movable type usually creates such an "empty" object. (The proposed promise 
doesn't adhere to this "convention" though.)