singleton-attr 0.1.9

Simple to use singleton procedural attribute and derive macro
Documentation 
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use singleton_attr::{derive, traits::Singleton};

#[derive(Debug, Default, derive::Singleton)]
pub struct Config {
    pub a: i32,
    pub b: i32,
    pub c: String,
}

fn main() {
    let config_1 = Config::get_instance();

    println!("--BEFORE: {:#?}", config_1);
    config_1.a = 123;
    config_1.b = -123;
    config_1.c = "Hello, World!".to_string();
    println!("--AFTER: {:#?}", config_1);

    let config_2 = Config::get_instance();
    println!("--BEFORE: {:#?}", config_2)
}