Operator Overloading - University of Georgia.ppt

Chapter 10Operator Overloading; Class string
C++ How to Program, 9/e
©1992-2014 by Pearson Education, Inc. All Rights Reserved.
©1992-2014 by Pearson Education, Inc. All Rights Reserved.
  Introduction
This chapter shows how to enable C++’s operators to work with objects—a process called operator overloading.
One example of an overloaded operator built into C++ is <<, which is used both as the stream insertion operator and as the bitwise left-shift operator..
C++ overloads the addition operator (+) and the subtraction operator (-) to perform differently, depending on their context in integer, floating-point and pointer arithmetic with data of fundamental types.
You can overload most operators to be used with class objects—piler generates the appropriate code based on the types of the operands.
©1992-2014 by Pearson Education, Inc. All Rights Reserved.
   Using the Overloaded Operators of Standard Library Class string
Figure demonstrates many of class string’s overloaded operators and several other useful member functions, including empty, substr and at.
Function empty determines whether a string is empty, function substr returns a string that represents a portion of an existing string and function at returns the character at a specific index in a string (after checking that the index is in range).
Chapter 21 presents class string in detail.
©1992-2014 by Pearson Education, Inc. All Rights Reserved.