how-to-implement-a-generator-trait-in-rust.md

How to implement a generator trait in Rust?

// plain

Generator traits are a powerful tool for creating iterators in Rust. They allow for the creation of custom iterators that can be used to iterate over collections of data.

Example code

use std::iter::Generator;

struct MyGenerator {
    // ...
}

impl Generator for MyGenerator {
    type Yield = i32;
    type Return = ();

    fn resume(&mut self) -> GeneratorState<Self::Yield, Self::Return> {
        // ...
    }
}

The code above creates a custom generator trait called MyGenerator. It implements the Generator trait from the std::iter module. The Yield and Return types are specified as i32 and () respectively. The resume method is then implemented, which is responsible for yielding values from the generator.

Code explanation

• use std::iter::Generator: This imports the Generator trait from the std::iter module.
• struct MyGenerator: This creates a custom generator struct.
• impl Generator for MyGenerator: This implements the Generator trait for the MyGenerator struct.
• type Yield = i32 and type Return = (): These specify the types of values that the generator will yield and return respectively.
• fn resume(&mut self) -> GeneratorState<Self::Yield, Self::Return>: This is the implementation of the resume method, which is responsible for yielding values from the generator.

Helpful links

• Generator Trait
• Generator State

group: rust-generators