is_instance.h

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#pragma once

#include <type_traits>

namespace scl{
    namespace tools{
        namespace meta{
            namespace details{
                template <template <class, class...> class, class...>
                struct __is_instance : std::false_type{};

                template <template <class, class...> class U, class... T>
                struct __is_instance<U, U<T...>> : std::true_type{};
            }

            template <template <class, class...> class U, class... T>
            inline constexpr bool is_instance(){
                return details::__is_instance<U, T...>::value;
            }
        }
    }
}