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 talk about the QuickStream structure:

  • The poll_next() function will continuously be invoked, and with each iteration, i's ticks attribute will be decremented by 1
  • Polling will stop when the ticks attribute reaches 0 and returns futures::Async::Ready<None>

Within the quick_streams() function:

  • We build a futures::task::Context by using futures::future::poll_on(f: FnMut(|cx: Context|)), so that we can explicitly invoke QuickStream's poll_next() function on lines 42 and 50
  • Since we have declared 10 ticks on line 38, our first two block_on's poll_next() calls should yield 9 and 8
  • The next block_on call, on line 57, will keep polling QuickStream until futures::Async::Ready<None> is returned from the ticks attribute equaling zero

Within iterate_streams():

  • futures::stream::iter_ok will convert an Iterator into a Stream, which will always be ready to return the next value
  • futures::stream::iter_result does the same thing as iter_ok...