lecture-6 - CPSC 223 Algorithms Data Abstract Structures...

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9/16/10 1 CPSC 223 Algorithms & Data Abstract Structures Lecture 6: Loose Ends Today … Homework Homework 2 due today Homework 3 assigned Wrap up overloading [Sect. 8.6] Static vs. Dynamic Binding [Sect. 8.2] CPSC 223, Fall 2010 2
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9/16/10 2 Operator Overloading Operator return values the residual value of the expression containing that operator and its operands pay close attention to the type and value returned returned value allows operator to be used in larger expressions … to be used as an operand in another operator (e.g., a + b + c ) CPSC 223, Fall 2010 3 C/C++ lvalues An “ lvalue An addressable variable (a variable that can be assigned to) What goes on the “ left side ” of an equation, for example: int m = 5; // m is an lvalue 3 = 2; // not allowed, 3 is not an lvalue An lvalue can usually be assigned to … Except when const is used (a non-modifiable lvalue) const int m = 5; CPSC 223, Fall 2010 4
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9/16/10 3 C/C++ rvalues An “ rvalue The opposite of an lvalue These values are not assignable (e.g., 5 + 2 = 8 ) Return values can make implementing operators tricky! CPSC 223, Fall 2010 5 Operator Overloading All arithmetic, bitwise, relational, equality, logical, and compound assignment operators can be overloaded The address-of, dereference, increment, decrement, and comma operators can also be overloaded Many operators cannot be overloaded, including scope resolution (::), direct member access (.), direct pointer to member access (.*), conditional operator (?:), size of object operator (sizeof) Operators that must be overloaded as members include assignment (=), subscript ([]), indirect member access operator (->), and indirect pointer to member access operator (->*)
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