Operators, Inheritance, and Upcasting - 2

• Member Functions and Implicit Parameter

Box b;                       // declares variable of type Box
b.SetDimensions(10,20,30);   // sets dimensions of b to 10, 20, 30

• Member Operators
1. Operator call syntax may not be modified
2. Number of parameters may not be changed
3. Implicit parameter is the first
• I/O Operators

std::ostream& operator << (std::ostream& os, const T& t); // outputs t to os
std::istream& operator >> (std::istream& is, T& t);       // inputs T object to t

• First parameter is a reference to a stream object
• Because the only type T parameter is the second parameter, these operators cannot be effectively overloaded as member functions