I was told that member function of a C++ class has an implicit parameter this which is a pointer to the object. But it seems to me that this parameter should be the object, not a pointer to it. For example, the overloaded operator + in expression obj1 + obj2 has its left operand as the first parameter of operator+ member function, which is the object obj1 instead of its address. So I would like to be confirmed whether the implicit parameter of a member function in C++ is *this or this.
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this needs to come from somewhere, thats what is usually called “the implicit (this) parameter”. this is a pointer, *this is a reference to the obejct.
It is implicit, because how it is actually done under the hood is an implementation detail. As pointed out in a comment, it makes no difference whether the implementation implicitly passes the object or a pointer, what you get is this and *this in either case (and a pointer is of course cheaper to pass).