January 2019
Intermediate to advanced
520 pages
14h 32m
English
Content preview from Hands-On Microservices with Rust
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Using the Future trait
Future is a trait that returns a result in the future and represents an operation that can't be completed immediately. Like the Result enumeration, Future has two outcome variants that are represented by the associated types Item and Error. The trait has a poll method, which is what retrieves the result. This method will be called by a reactor until it returns Error or an Async::Ready value. Async is an enumeration that has both Ready and Pending variants, which are used to represent a result of an asynchronous operation. Ready means the value is ready to use, while Pending means the value is not yet available and will be ready later.
As you can see, Future is used for a similar purpose to Result. Unlike Result, however, ...
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O’Reilly covers everything we've got, with content to help us build a world-class technology community, upgrade the capabilities and competencies of our teams, and improve overall team performance as well as their engagement.Julian F.
I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.Addison B.
I’ve been on the O’Reilly platform for more than eight years. I use a couple of learning platforms, but I'm on O'Reilly more than anybody else. When you're there, you start learning. I'm never disappointed.Amir M.
I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.