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 heart and soul of an Rc is its internal counter of how many objects own it at the moment. Every time the Rc is cloned, it increases by one, and every time one of its clones go out of scope, it decreases by one. The moment this counter reaches zero, the objects behind the Rc are destroyed. The main method contains some annotated examples of values the counter reaches during its lifetime to help you understand how the mechanism works.

The effect of the simple rules presented is that a resource behind an Rc will only be deleted once it's no longer used, at the slim cost of a very small runtime performance loss because of the ongoing counting. This delayed deletion effect is ideal for resources that are shared between objects. Simply wrap them in an Rc and they will make sure that everything survives long enough. This is the equivalent of shared_ptr in C++.