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)

Alternative ways to write trait bounds

So far, we've been writing trait bounds as a where clause, but there are two alternative ways of writing them. The where clause is nice because it's somewhat out of the way, allowing us to write even complex trait bounds without interfering with reading the rest of the function or data type declaration.

The first alternative is to put the trait bounds alongside the generic type parameter names, like this:

impl<K: PartialOrd + PartialEq, V> TreeNode<K, V> {

For a standalone function, that technique looks like this:

fn print_generic<T: Display>(value: T) {

This can be good for data types or functions that only have simple trait bounds, but we can see that even with just two required traits, the TreeNode implementation block is getting a little hard to read. The trait bound kind of breaks up the flow and makes us...