lazy-attribute 0.1.1

The lazy_attribute crate provides a lazy attribute procedural macro that allows you to lazily evaluate a function and cache its result.

Usage

Add this to your Cargo.toml:

[dependencies]
lazy-attribute = "0.1"

Examples

Lazily evaluate a function:

use lazy_attribute::lazy;

fn main() {
    println!("{}", foo());  // Outputs: Called once! 42
    println!("{}", foo());  // Outputs: 42
}

#[lazy]
fn foo() -> i32 {
    println!("Called once!");
    42
}

Lazily evaluate an async function (requires async feature):

use lazy_attribute::lazy;

#[tokio::main]
async fn main() {
    println!("{}", foo().await);  // Outputs: Called once! 42
    println!("{}", foo().await);  // Outputs: 42
}

#[lazy(async)]
async fn foo() -> i32 {
    println!("Called once!");
    42
}

Crate Features

• async - Enables support for lazily evaluating async functions.