October 2018
Beginner
180 pages
4h 48m
English
Content preview from Rust Quick Start Guide
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Trait objects
Forward, Turn, and Stop are still three different data types. There's no data type that represents Forward, Turn, Stop, and though we could create one using an enumeration, there's another way. There is a data type that represents a borrow of any data type that has the PrintableDirection trait. It's written as &dyn PrintableDirection and is called a trait object reference.
We can't just write something like let x: dyn PrintableDirection and create a variable that can store anything with the PrintableDirection trait. It needs to be a borrow, or something that stores contained data outside the stack, such as the Box type we'll look at in the next chapter.
The dyn keyword is short for dynamic dispatch, and it means that what looks ...
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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.