The user-defined function called operator++ implements the prefix and postfix ++ operator. If this function is a non-static member function with no parameters, or a non-member function with one parameter, it defines the prefix increment operator ++ for objects of that type. If the function is a non-static member function with one parameter (which shall be of type int) or a non-member function with two parameters (the second of which shall be of type int), it defines the postfix increment operator ++ for objects of that type. When the postfix increment is called as a result of using the ++ operator, the int argument will have value zero.134 [ Example:
struct X {
X& operator++(); X operator++(int); };
struct Y { };
Y& operator++(Y&); Y operator++(Y&, int);
void f(X a, Y b) {
++a; a++; ++b; b++;
a.operator++(); a.operator++(0); operator++(b); operator++(b, 0); }
— end example ]
The prefix and postfix decrement operators -- are handled analogously.
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