Book Image

Mastering Rust. - Second Edition

By : Rahul Sharma
Book Image

Mastering Rust. - Second Edition

By: Rahul Sharma

Overview of this book

Rust is an empowering language that provides a rare combination of safety, speed, and zero-cost abstractions. Mastering Rust – Second Edition is filled with clear and simple explanations of the language features along with real-world examples, showing you how you can build robust, scalable, and reliable programs. This second edition of the book improves upon the previous one and touches on all aspects that make Rust a great language. We have included the features from latest Rust 2018 edition such as the new module system, the smarter compiler, helpful error messages, and the stable procedural macros. You’ll learn how Rust can be used for systems programming, network programming, and even on the web. You’ll also learn techniques such as writing memory-safe code, building idiomatic Rust libraries, writing efficient asynchronous networking code, and advanced macros. The book contains a mix of theory and hands-on tasks so you acquire the skills as well as the knowledge, and it also provides exercises to hammer the concepts in. After reading this book, you will be able to implement Rust for your enterprise projects, write better tests and documentation, design for performance, and write idiomatic Rust code.
Table of Contents (19 chapters)

Procedural macros

Declarative macros can become tedious to read and maintain when your code generation logic becomes complex, as you need to write your logic with its own DSL to manipulate tokens. There are better, more flexible ways than using macro_rules!. For complex problems, you can leverage procedural macros as they are better suited to writing something non-trivial. They are suitable for cases where you need full control of code generation.

These macros are implemented as functions. These functions receive the macro input as a TokenStream type and return the generated code as a TokenStream after undergoing any transformation at compile time. To mark a function as a procedural macro, we need to annotate it with the #[proc_macro] attribute. At the time of writing this book, procedural macros come in three forms, which are categorized by how they are invoked:

  • Function-like...