rc_key_map_behavior.rs

use std::rc::Rc;
use std::sync::{RwLock, Arc};
use std::thread;
use std::collections::HashMap;
use std::collections::HashSet;
use std::fmt;
use std::clone::Clone;


fn main() {
    let mut m:HashMap<Rc<String>, Rc<usize>> = HashMap::new();
    let fkey = Rc::new("foo".to_string());
    let key = Rc::new("foo".to_string());
    let key1 = Rc::clone(&key);
    let val = Rc::new(6);
    let val1 = Rc::clone(&val);
    println!("key {:?}, val {:?}", Rc::strong_count(&key), Rc::strong_count(&val));
    m.insert(key1, val1);
    println!("key {:?}, val {:?}", Rc::strong_count(&key), Rc::strong_count(&val));
    let lookup = m.get_key_value(&fkey).unwrap();
    println!("{:?} {:?}", lookup.0, lookup.1);
    println!("key {:?}, val {:?}", Rc::strong_count(&key), Rc::strong_count(&val));
}