Book Image

Rust Quick Start Guide

By : Daniel Arbuckle
Book Image

Rust Quick Start Guide

By: Daniel Arbuckle

Overview of this book

Rust is an emerging programming language applicable to areas such as embedded programming, network programming, system programming, and web development. This book will take you from the basics of Rust to a point where your code compiles and does what you intend it to do! This book starts with an introduction to Rust and how to get set for programming, including the rustup and cargo tools for managing a Rust installation and development work?ow. Then you'll learn about the fundamentals of structuring a Rust program, such as functions, mutability, data structures, implementing behavior for types, and many more. You will also learn about concepts that Rust handles differently from most other languages. After understanding the Basics of Rust programming, you will learn about the core ideas, such as variable ownership, scope, lifetime, and borrowing. After these key ideas, you will explore making decisions in Rust based on data types by learning about match and if let expressions. After that, you'll work with different data types in Rust, and learn about memory management and smart pointers.
Table of Contents (10 chapters)

Accessing borrowed data

To receive borrowed data, we need to properly specify the data type as a borrow. That is done by using & or &mut with the data type on the receiving end, just as we used them with the data value on the sending end.

While the term borrow is common in Rust, the technical term is reference. So, we will usually say we are borrowing data, using borrowed data, or that a data value is accessed as a borrow, but we could also say that we are referencing data, using referenced data, or that a data value is accessed by reference.

Here, we have the definition of two functions, the same two functions we used in our previous examples. Look at the data types specified for the point parameter on each one:

pub fn borrow_ownership(point: &Point2D) {
println!("Point2D{{x: {}, y: {}}} is now borrowed by a new scope", point.x, point.y);

pub fn borrow_ownership_mutably...