Re: [boost] [utility] Proposal to extract some components from Boost.Log

Subject: Re: [boost] [utility] Proposal to extract some components from Boost.Log
From: Andrey Semashev (andrey.semashev_at_[hidden])
Date: 2013-09-01 13:11:07

On Sunday 01 September 2013 15:52:53 you wrote:
> On Sunday 01 September 2013 07:46:40 John Bytheway wrote:
> > But this works:
> > 
> > struct foo
> > {
> > 
> >   void* m_p;
> >   
> >   constexpr explicit operator bool () const
> >   {
> >   
> >     return !this->operator!();
> >   
> >   }
> >   
> >   constexpr bool operator! () const
> >   {
> >   
> >     return !m_p;
> >   
> >   }
> > 
> > };
> > 
> > int main()
> > {
> > 
> >   constexpr auto f = foo{nullptr};
> >   constexpr auto b = bool(f);
> >   return b;
> > 
> > }
> 
> That would force the user to have constexpr operator!, which is not always
> possible. I think two macros are a better choice.

Extracted the macro.

https://svn.boost.org/trac/boost/changeset/85543