Cache the result of a function HashMap

Caching the result of a function using the cached crate

examples/cache-hashmap-result-of-function/src/main.rs

use std::collections::HashMap;
use cached::macros::cached;

fn main() {
    let config = get_config();
    println!("Config: {:?}", config);

    let config = get_config();
    println!("Config: {:?}", config);
}


#[cached]
fn get_config() -> HashMap<&'static str, String> {
    println!("get_config called");

    let mut config = HashMap::new();
    config.insert("city", String::from("Seoul"));
    config.insert("country", String::from("Korea"));
    config
}

The function runs only once.

examples/cache-hashmap-result-of-function/out.txt

get_config called
Config: {"country": "Korea", "city": "Seoul"}
Config: {"country": "Korea", "city": "Seoul"}

examples/cache-hashmap-result-of-function/Cargo.toml

[package]
name = "cache-hashmap-result-of-function"
version = "0.1.0"
edition = "2024"

[dependencies]
cached = "2.0.2"