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)

How to do it...

  1. Create a Rust project to work on during this chapter with cargo new chapter-six.
  2. Navigate to the newly created chapter-six folder. For the rest of this chapter, we will assume that your command line is currently in this directory.
  3. Inside the folder src, create a new folder called bin.
  4. Delete the generated file, as we are not creating a library.
  5. In the folder src/bin, create a file called
  6. Add the following code and run it with cargo run --bin custom_error:
1   use std::{error, fmt, io, num, result};
2 use std::fs::File;
3 use std::io::{BufReader, Read};
5 #[derive(Debug)]
6 // This is going to be our custom Error type
7 enum AgeReaderError {
8 Io(io::Error),
9 Parse(num::ParseIntError),
10 NegativeAge(),
11 }
13 // It is common to alias Result in an Error module
14 type Result<T> = result::Result<T, AgeReaderError>;
16 impl error::Error for AgeReaderError {
17 fn description(&self) -> &str {
18 ...