Re: [boost] VC2013 1.55 beta failures

Subject: Re: [boost] VC2013 1.55 beta failures
From: Beman Dawes (bdawes_at_[hidden])
Date: 2013-10-18 11:30:47

On Fri, Oct 18, 2013 at 10:00 AM, Peter Dimov <lists_at_[hidden]> wrote:

> Marcel Raad wrote:
>
>> Sorry, I just noticed that I only get compile errors if I call
>> boost::signals2::signal<>::**connect with the result of boost::bind, so
>> the problem indeed seems to be boost::signals2.
>>
>> I get the following errors:
>>
> [...]
>
> These errors are, I think, caused by trying to call something like
> boost::bind( f, _1 ) (which needs an argument) with an empty argument list,
> but without more information about the source line causing the errors, I
> can't be sure.
>
> I don't know why these only appear when BOOST_NO_CXX11_VARIADIC_TEMPLATES
> is not defined. Perhaps Signals2 has a different code path for variadic
> templates? Or perhaps your code does something different when
> BOOST_NO_CXX11_VARIADIC_TEMPLATES is not defined?
>

Yes, signals2 does have multiple different code paths for variadics. The
problem is apparently that it should be testing for more
than BOOST_NO_CXX11_VARIADIC_TEMPLATES, but we don't yet know exactly what
more. Suggestions have been expression SFINAE or a decltype issue.

--Beman