Im so sorry that i have alot of questions, but there are so few examples... as you say these types are for containers. and function that works with variable type is looks like void func_c(void *ref, int typeId) { // Do something with the reference // The type of the reference is determined through the type id } the question is: do i need to call AddRef for the *ref parameter before i store it? Is *ref points to a real object or to its copy? How can i recive class name(char*) by typeId?