Re: [boost] [move] explicit moving from a rvalue

Subject: Re: [boost] [move] explicit moving from a rvalue
From: Ion Gaztañaga (igaztanaga_at_[hidden])
Date: 2012-03-26 16:18:52

El 26/03/2012 22:15, Ion Gaztañaga escribió:
> El 26/03/2012 21:42, Vicente J. Botet Escriba escribió:
>> Hi Ion,
>>
>> With the current emulation of move semantics of Boost.Thread using
>> Boost.move, I have a case that I would like to make working in a
>> portable way
>>
>> boost::thread t = boost::thread( MoveOnly());
>>
>> The library declares the template move constructor from a movable
>> callable as as follows
>>
>> template <class F>
>> explicit thread(boost::rv<F>& f);
>
> Why is the constructor explicit?

Sorry, I replied too fast, thinking it was a plain move constructor. I 
see the need for it.

> The problem is a know limitation as the compiler is unable to deduce F as been MoveOnly even if MoveOnly is convertible to boost::rv<MoveOnly>&
> Jeffrey Lee Hellrung, Jr. made a proposal to try to solve the issue, but his proposal has a performance penality.

I just wonder if some kind of "always_inline" attribute for this 
proposal would fix the performance issue.

Ion