don't allow for pointer inside Some<> and use enable_if_t

src/shogun/base/SGObject.h

@@ -403,7 +403,7 @@ class CSGObject
 	 * @param name name of the parameter
 	 * @param value value of the parameter, wrapped in smart pointer
 	 */
-	template <typename T, typename T2 = typename std::enable_if<std::is_base_of<CSGObject, typename std::remove_pointer<T>::type>::value, T>::type>
+	template <typename T, typename std::enable_if_t<std::is_base_of<CSGObject, T>::value, T>* = nullptr>
 	void put(const std::string& name, Some<T> value)
 	{
 		put(name, (CSGObject*)(value.get()));