Traits: Introduction to Define Shared Behavior
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This document discusses Rust traits, including trait definitions, implementations, and bounds. Traits allow adding functionality to types and tell the compiler what methods a type must provide. Trait bounds restrict function parameters to types that implement certain traits. Trait objects allow values of different types to be treated as the same trait by performing dynamic dispatch at runtime using pointers like Box.
Traits: Introduction to Define Shared Behavior
- 1. Traits: Defining Shared Behavior Presented By: Pawan Bisht Software Consultant Knoldus Inc.
- 2. 01 Trait: Introduction 02 Trait Bounds 03 Trait Objects Our Agenda
- 3. Trait: Introduction Traits are the abstract mechanism for adding functionality to types or it tells Rust compiler about functionality a type must provide. ● Trait Definition (Desired Behavior) ● Trait Implementation ● Default Implementation of a Trait
- 4. Trait: Introduction ● Traits can be implemented for Existing Types ● Access Methods Declared in the Same Trait ● Perform Static Dispatch ● Perform Dynamic Dispatch
- 5. Quick Demo
- 6. Trait Bounds “Trait Bounds are the longer forms of Passing Parameters as a Function, with the help of this user can put the restriction into his functionality like only limited functions can able to use it.”
- 7. Trait Bounds // Passing as a parameter pub fn function_name(item: impl TraitName) { } // Trait Bound pub fn function_name<T: TraitName> (item: T) { }
- 8. Trait Bounds // Passing as a parameter pub fn function_name(item1: impl TraitName, item2: impl TraitName) { } // Trait Bound pub fn function_name<T: TraitName> (item1: T, item2: T) { }
- 9. Quick Demo
- 10. Trait Object Trait objects, like &Foo or Box<Foo>, are normal values that store a value of any type that implements the given trait, where the precise type can only be known at runtime. Trait Objects performs Dynamic Dispatch Pointers used to define Trait Objects are : Box, Arc, Rc and &
- 14. Quick Demo
- 15. References ● https://doc.rust-lang.org/book/ch10-02-traits.html ● https://doc.rust-lang.org/book/ch17-02-trait-objects.html ● https://www.slideshare.net/NellShamrell/rust-traits-and-you-a- deep-dive