Re: [boost] [spirit] Two failures caused by thread lib updated?

From: Martin Wille (mw8329_at_[hidden])
Date: 2007-10-27 16:54:16

Peter Dimov wrote:
> Markus Schöpflin:
[...]
>> F=boost::reference_wrapper<single_grammar_object_task>]"
>>                 f();
>> ----------------^
>>
>> Anyone knows what's going on?
> 
> I think I do. The new Boost.Threads implements the proposed standard 
> interface where F is expected to be a function object; 
> std::reference_wrapper is, but boost::reference_wrapper isn't. The old 
> Boost.Threads did not suffer from this problem since it stored F in a 
> boost::function, which automatically recognizes reference_wrapper and 
> "dereferences" it before the call.
> 
> This can be fixed on the user side by wrapping the reference_wrapper in a 
> boost::bind, or it can be fixed on the Boost.Threads side. The third option, 
> making boost::reference_wrapper callable, is a very risky change that I 
> would advise against. 

(4) create a custom callable object. I'll look into that tomorrow. (I'd
rather not introduce an additional dependency for such a simple task.)

Thanks for the explanations,
m