Book Image

The Complete Rust Programming Reference Guide

By : Rahul Sharma, Vesa Kaihlavirta, Claus Matzinger
Book Image

The Complete Rust Programming Reference Guide

By: Rahul Sharma, Vesa Kaihlavirta, Claus Matzinger

Overview of this book

Rust is a powerful language with a rare combination of safety, speed, and zero-cost abstractions. This Learning Path is filled with clear and simple explanations of its features along with real-world examples, demonstrating how you can build robust, scalable, and reliable programs. You’ll get started with an introduction to Rust data structures, algorithms, and essential language constructs. Next, you will understand how to store data using linked lists, arrays, stacks, and queues. You’ll also learn to implement sorting and searching algorithms, such as Brute Force algorithms, Greedy algorithms, Dynamic Programming, and Backtracking. As you progress, you’ll pick up on using Rust for systems programming, network programming, and the web. You’ll then move on to discover a variety of techniques, right from writing memory-safe code, to building idiomatic Rust libraries, and even advanced macros. By the end of this Learning Path, you’ll be able to implement Rust for enterprise projects, writing better tests and documentation, designing for performance, and creating idiomatic Rust code. This Learning Path includes content from the following Packt products: • Mastering Rust - Second Edition by Rahul Sharma and Vesa Kaihlavirta • Hands-On Data Structures and Algorithms with Rust by Claus Matzinger
Table of Contents (29 chapters)
Title Page
Copyright
About Packt
Contributors
Preface
Index

Debugging macros


When developing complex macros, most of the time you need ways to analyze how your code expands to the inputs you gave to the macro. You can always use println! or panic! at the places you want to see the generated code, but it's a very crude way to debug it. There's are better way, though. The Rust community provides us with a subcommand called cargo-expand. This subcommand was developed by David Tonlay at https://github.com/dtolnay/cargo-expand, who is also the author of the syn and quote crates. This command internally calls the nightly compiler flag -Zunstable-options --pretty=expanded, but the design of the subcommand was done in such a way that it doesn't require you to manually switch to the nightly tool chain as it finds and switches to it automatically. To demonstrate this command, we'll take the example of our IntoMap derive macro and observe what code it generated for us. By switching into the directory and running cargo expand, we get the following output:

As...