Re: [boost] BOOST_STATIC_CONSTANT

Subject: Re: [boost] BOOST_STATIC_CONSTANT
From: Gavin Lambert (gavinl_at_[hidden])
Date: 2017-08-17 01:45:54

On 17/08/2017 13:27, Glen Fernandes wrote:
> This is to detect a member 'impl_ptr_type' type? Just:
> 
>      template<class, class = void>
>      struct has_impl_ptr_type
>          : boost::false_type { };
>      template<class T>
>      struct has_impl_ptr_type<T, boost::void_t<typename T::impl_ptr_type> >
>          : boost::true_type { };

That *is* a nicer way to do it.  Requires a minimum of Boost 1.64 or 
C++17, though.  (Or VS2015, apparently.)