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  • Book Overview & Buying Extreme C
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Extreme C

Extreme C

By : Kamran Amini
4.5 (29)
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Extreme C

Extreme C

4.5 (29)
By: Kamran Amini

Overview of this book

There’s a lot more to C than knowing the language syntax. The industry looks for developers with a rigorous, scientific understanding of the principles and practices. Extreme C will teach you to use C’s advanced low-level power to write effective, efficient systems. This intensive, practical guide will help you become an expert C programmer. Building on your existing C knowledge, you will master preprocessor directives, macros, conditional compilation, pointers, and much more. You will gain new insight into algorithm design, functions, and structures. You will discover how C helps you squeeze maximum performance out of critical, resource-constrained applications. C still plays a critical role in 21st-century programming, remaining the core language for precision engineering, aviations, space research, and more. This book shows how C works with Unix, how to implement OO principles in C, and fully covers multi-processing. In Extreme C, Amini encourages you to think, question, apply, and experiment for yourself. The book is essential for anybody who wants to take their C to the next level.
Table of Contents (27 chapters)
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Other Books You May Enjoy
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Index

Type generic macros

In C11, a new keyword has been introduced: _Generic. It can be used to write macros that are type-aware at compile time. In other words, you can write macros that can change their value based on the type of their arguments. This is usually called generic selection. Look at the following code example in Code Box 12-6:

#include <stdio.h>
#define abs(x) _Generic((x), \
                        int: absi, \
                        double: absd)(x)
int absi(int a) {
  return a > 0 ? a : -a;
}
double absd(double a) {
  return a > 0 ? a : -a;
}
int main(int argc, char** argv) {
  printf("abs(-2): %d\n", abs(-2));
  printf("abs(2.5): %f\n", abs(2.5));;
  return 0;
}

Code Box 12-6: Example of a generic macro

As you can see in the macro definition, we have used different expressions based on the type of the argument x. We use absi if it is an integer value, and absd if it is a double value. This feature is not new to C11, and you can...

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Extreme C
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