A simple in-mem cache for Rust

A simple rust implementation of HashMap with expiration control.

Example

Without expiration:

```rust use simplecachers::SimpleCache;

let mut scache: SimpleCache = SimpleCache::new(None);

scache.insert(1, String::from("test")); println!("{:?}", scache.get(&1)); ```

With expiration:

```rust use simplecachers::SimpleCache; use std::time::Duration; use std::thread; // For example purposes only

let timeout = Duration::new(1, 0); let mut scache: SimpleCache = SimpleCache::new(Some(timeout));

scache.insert(1, String::from("test")); assert_eq!(Some(String::from("test")), scache.get(&1));

thread::sleep(Duration::new(1, 1)); // For example purposes only assert_ne!(Some(String::from("test")), scache.get(&1)); ```