April 2011
Beginner
624 pages
11h 34m
English
Content preview from C++ Without Fear: A Beginner’s Guide That Makes You Feel Smart, Second EditionBecome an O’Reilly member and get unlimited access to this title plus top books and audiobooks from O’Reilly and nearly 200 top publishers, thousands of courses curated by job role, 150+ live events each month,
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13. Operator Functions: Doing It with Class
After reading Chapter 12, you know how to write classes (object types) that work just like standard data types, right?
Well, almost. One of the most important features of a standard data type such as int, float, double, and even char is that you can perform operations on them. Without these operators, it would be difficult to perform any calculations in C++ at all.
C++ lets you define how to perform these same operations (such as +, -, *, and /) on objects of your own classes. You can also define how a test-for-equality is carried out, helping you determine whether two quantities are equal, as in this fragment of code:
Fraction a(1, 2), b(1, 3);if (a + b == Fraction(5, 6)) cout << "1/2 + 1/3 equals ...
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