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

Custom errors and the Error trait


A non-trivial project that has varied functionality is often spread across modules. With an organization, it's more informative to provide module-specific error messages and information for the user. Rust allows us to create custom error types that can help us achieve more granular error reports from our application. Without custom errors that are specific to our project, we might have to use existing error types in the standard library, which may not be relevant to our API's operations and will not give precise information to users if things go wrong with an operation in our module.

In languages that have exceptions, such as Java, the way you create custom exceptions is by inheriting from the base Exception class and overriding its methods and member variables. While Rust doesn't have type-level inheritance, it has trait inheritance and provides us with the Error trait that any type can implement, making the type a custom error type. This type can now be...