C++ programmers typically pass pointers to objects, and do not normally copy the object itself. However, they do have the option of pointer, copy, and reference access:
void foo_pointer (Object *x);
void foo_copy (Object x);
void foo_reference (Object &x);They don't usually refer to these things as "call by value" or "call by reference" - those terms are uncommon amongst C++ programmers, but common amongst Visual Basic programmers where there are no pointers.