singletonum 0.2.0

singleton derive macro
Documentation 
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#[macro_use]
extern crate singletonum_derive;
extern crate once_cell;

pub use singletonum_derive::*;
pub use once_cell::sync::OnceCell;

pub trait Singleton: SingletonInit {
    fn get_instance(init: &Self::Init) -> &'static Self;
}

pub trait SingletonInit {
    type Init;
    fn init(init: &Self::Init) -> Self;
}