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 07:52:53

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.