If you want to pass class instances (objects), you either use
void function(const MyClass& object){
// do something with object
}
or
void process(MyClass& object_to_be_changed){
// change member variables
}
On the other hand if you want to "pass" the class itself
template<class AnyClass>
void function_taking_class(){
// use static functions of AnyClass
AnyClass::count_instances();
// or create an object of AnyClass and use it
AnyClass object;
object.member = value;
}
// call it as
function_taking_class<MyClass>();
// or
function_taking_class<MyStruct>();
with
class MyClass{
int member;
//...
};
MyClass object1;