Re: [boost] BOOST_STATIC_CONSTANT

Subject: Re: [boost] BOOST_STATIC_CONSTANT
From: dodheim (adammerz_at_[hidden])
Date: 2017-08-17 04:35:33

Boost - Dev mailing list wrote
> 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&lt;T, boost::void_t&lt;typename
>> T::impl_ptr_type&gt; >
>>          : 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.)

This only requires C++11; it doesn't work on earlier versions of MSVC
because
MSVC was (and still is) lagging behind on support for expression-SFINAE.

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