beginner's question regarding pass parameter

[Matthew Monopole]

pass by value is:
declare with:
function(class a)
call with:
function(a)
and a is COPIED

pass by reference is
declare with:
function(class *a)
called with:
function(&a);
and a pointer of a is COPIED, but only one copy of a in memory

pass by (what's the third one???) is:
declare with:
function(class& a);
called with
function(a);
and a pointer is passed, only one copy in memory...

IS THIS CORRECT?

 

[Jakob Bieling]

pass by value is:
declare with:
function(class a)
call with:
function(a)
and a is COPIED
Right.

pass by reference is
declare with:
function(class *a)

Actually, this is passing by /pointer/. myclass* is a
pointer-to-myclass.

called with:
function(&a);
and a pointer of a is COPIED, but only one copy of a in memory
Right.

pass by (what's the third one???) is:
declare with:
function(class& a);

This would then be passing by /reference/. myclass& is a
reference-to-myclass.

called with
function(a);
and a pointer is passed, only one copy in memory...

Right.

hth