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...

First, let's take a look at the futures::Sink trait itself:

pub trait Sink {
type SinkItem;
type SinkError;

fn poll_ready(
&mut self,
cx: &mut Context
) -> Result<Async<()>, Self::SinkError>;
fn start_send(
&mut self,
item: Self::SinkItem
) -> Result<(), Self::SinkError>;
fn poll_flush(
&mut self,
cx: &mut Context
) -> Result<Async<()>, Self::SinkError>;
fn poll_close(
&mut self,
cx: &mut Context
) -> Result<Async<()>, Self::SinkError>;
}

We are already familiar with the Item and Error concepts from futures and streams, so we will move on to the required functions:

  • poll_ready must be invoked with the returning value of Ok(futures::Async::Ready(())) before each attempt at using start_send. If the sink receives an error, the sink will no longer be able to receive items.
  • start_send, as stated previously...