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 it works...

The bitflags! macro lets you define all of your flags and their underlying type (in our case, this is u32)[4 to 15]. They are written in ALL_CAPS because they are constants. We can also define collections of flags this way, as we did with ALL[10]. We could have added additional combinations, for example:

const SPICY = Self::PEPPER.bits | Self::CHILI.bits;

The macro then creates a struct with the specified members for you and implements a bunch of traits for it in order to enable the familiar |, &, -, and ! notations [37 to 40] and pretty printing. You can still access the raw bits used in the background directly over the member of the same name.

Note that, when printing, flag combinations will be listed separately. For instance, look at the output in line [47]. After setting all possible flags in the field to active, it will pretty print itself as the following:

Custom spice after adding saffron: SALT | PEPPER | CHILI | SAFFRON | ALL

A useful method to additionally...