michie 1.0.0

An attribute macro that adds memoization to a function (sounds like Mickey)
Documentation 
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#![doc = include_str!("../README.md")]

use std::{
    collections::{BTreeMap, HashMap},
    hash::Hash,
};

/// See [crate level documentation](crate).
pub use michie_macro::memoized;

pub trait MemoizationStore<K, R> {
    fn insert(&mut self, key: K, value: R) -> R;
    fn get(&self, key: &K) -> Option<R>;
}

impl<K, R> MemoizationStore<K, R> for HashMap<K, R>
where
    K: Eq + Hash,
    R: Clone,
{
    fn insert(&mut self, key: K, value: R) -> R {
        HashMap::insert(self, key, value.clone());
        value
    }
    fn get(&self, key: &K) -> Option<R> {
        HashMap::get(self, key).cloned()
    }
}

impl<K, R> MemoizationStore<K, R> for BTreeMap<K, R>
where
    K: Ord,
    R: Clone,
{
    fn insert(&mut self, key: K, value: R) -> R {
        BTreeMap::insert(self, key, value.clone());
        value
    }
    fn get(&self, key: &K) -> Option<R> {
        BTreeMap::get(self, key).cloned()
    }
}