use std::any::{Any, TypeId};
use std::collections::HashMap;

struct AnyMap {
    inner: HashMap<TypeId, Box<Any>>,
}

impl AnyMap {
    fn new() -> Self {
        AnyMap { inner: Default::default() }
    }

    fn insert<T: 'static>(&mut self, value: T) {
        self.inner.insert(value.type_id(), Box::new(value));
    }

    fn get<T: 'static>(&self) -> Option<&T> {
        self.inner.get(&TypeId::of::<T>()).and_then(|x| x.downcast_ref())
    }
}

fn main() {
    let mut map = AnyMap::new();
    map.insert(1i32);
    map.insert(String::from("foobar"));
    println!("{:?}", map.get::<i32>());
    println!("{:?}", map.get::<bool>());
    println!("{:?}", map.get::<String>());
}