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. Open the Cargo.toml file that has been generated earlier for you.

  2. In the bin folder, create a file called

  3. Add the following code, and run it with cargo run --bin compose_functions:

1   #![feature(conservative_impl_trait)]
3   // The compose! macro takes a variadic amount of closures and  
returns 4 // a closure that applies them all one after another 5 macro_rules! compose { 6 ( $last:expr ) => { $last }; 7 ( $head:expr, $ ($tail:expr), +) => { 8 compose_two($head, compose!($ ($tail), +)) 9 }; 10 } 11 12 // compose_two is a helper function used to 13 // compose only two closures into one 14 fn compose_two<FunOne, FunTwo, Input, Intermediate, Output>( 15 fun_one: FunOne, 16 fun_two: FunTwo, 17 ) -> impl Fn(Input) -> Output 18 where 19 FunOne: Fn(Input) -> Intermediate, 20 FunTwo: Fn(Intermediate) -> Output, 21 { 22 move |x| fun_two(fun_one(x)) 23 } 24 ...