Refactored IsViewType to work even for types that do not have a ViewType member type

 */

template< typename T >

struct IsViewType

: public std::integral_constant< bool,

            std::is_same< typename std::decay_t<T>::ViewType, T >::value >

{};

{

private:

   template< typename C > static constexpr auto test(C)

      -> std::integral_constant< bool,

               std::is_same< typename C::ViewType, C >::value

         >;

   static constexpr std::false_type test(...);

public:

   static constexpr bool value = decltype( test(std::decay_t<T>{}) )::value;

};

/**

 * \brief Type trait for checking if T has getCommunicator method.