More Exceptional C++

Chapter 35. #Definition

Difficulty: 4

What can and can't macros do? Not all compilers agree.

1. Demonstrate how to write a simple max() preprocessor macro that takes two arguments and evaluates to the one that is greater, using normal < comparison. What are the usual pitfalls in writing such a macro?

2. What can a preprocessor macro not create? Why not?

Solution

Common Macro Pitfalls

• 1. Demonstrate how to write a simple max() preprocessor macro that takes two arguments and evaluates to the one that is greater, using normal < comparison. What are the usual pitfalls in writing such a macro?

There are four major pitfalls, in addition to several further drawbacks. ...