Book Image

Rust Standard Library Cookbook

By : Jan Hohenheim, Daniel Durante
Book Image

Rust Standard Library Cookbook

By: Jan Hohenheim, Daniel Durante

Overview of this book

Mozilla’s Rust is gaining much attention with amazing features and a powerful library. This book will take you through varied recipes to teach you how to leverage the Standard library to implement efficient solutions. The book begins with a brief look at the basic modules of the Standard library and collections. From here, the recipes will cover packages that support file/directory handling and interaction through parsing. You will learn about packages related to advanced data structures, error handling, and networking. You will also learn to work with futures and experimental nightly features. The book also covers the most relevant external crates in Rust. By the end of the book, you will be proficient at using the Rust Standard library.
Table of Contents (12 chapters)

Providing user-defined error types

In the previous chapters, we learned about a few ways to handle functions that have to deal with different kinds of errors. So far, we have:

  • Simply panicked when encountering them
  • Returned only one kind of error and converted all others into it
  • Returned different kinds of errors in a Box

Most of these have been used because we didn't reach this recipe yet. Now, we are going to learn about the preferred way of doing things, creating a custom kind of Error that contains multiple sub-errors.