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Rust Programming Cookbook

You're reading from   Rust Programming Cookbook Explore the latest features of Rust 2018 for building fast and secure apps

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Product type Paperback
Published in Oct 2019
Publisher Packt
ISBN-13 9781789530667
Length 444 pages
Edition 1st Edition
Languages
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Author (1):
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Claus Matzinger Claus Matzinger
Author Profile Icon Claus Matzinger
Claus Matzinger
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Table of Contents (12) Chapters Close

Preface 1. Starting Off with Rust 2. Going Further with Advanced Rust FREE CHAPTER 3. Managing Projects with Cargo 4. Fearless Concurrency 5. Handling Errors and Other Results 6. Expressing Yourself with Macros 7. Integrating Rust with Other Languages 8. Safe Programming for the Web 9. Systems Programming Made Easy 10. Getting Practical with Rust 11. Other Books You May Enjoy

Expressing Yourself with Macros

In the previous century, many languages featured a preprocessor (most prominently, C/C++) that often did unassuming text replacement. While this is handy for expressing constants (#define MYCONST 1), it also leads to potentially unexpected outcomes once the replacement gets more complex (for example, #define MYCONST 1 + 1 and when applied as 5 * MYCONST yields 5 * 1 + 1 = 6 instead of the expected 10 (from 5 * (1 + 1)) ) .

However, a preprocessor allows program programming (metaprogramming) and therefore makes things easier for the developer. Instead of copying and pasting expressions and excessive boilerplate code, a quick macro definition leads to a smaller code base and reusable calls and—as a consequence—fewer errors. In order to make the best use of Rust's type system, macros cannot simply search and replace text; they have...

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