Method _construct

include/covscript/core/cni.hpp:595–605

		{
			template <typename X, typename RetT, typename... ArgsT>
			static cni_holder_base *_construct(X &&val, RetT (*target_function)(ArgsT...))
			{
				using source_function_type = typename cni_decayed_conversion_cpp<RetT>::target_type (*)(
				                                 typename cni_decayed_conversion_cs<ArgsT>::source_type...);
				// Return type
				static_assert(cni_convertible<RetT, typename cni_decayed_conversion_cpp<RetT>::target_type>::value,
				              "Invalid conversion.");
				// Argument type
				check_conversion(target_function, source_function_type(nullptr));
				return new cni_holder<T, source_function_type>(std::forward<X>(val));
			}

			template <typename X>
			static cni_holder_base *construct(X &&val)