rust/src/test/ui/run-pass/threads-sendsync/send_str_hashmap.rs

// Copyright 2013 The Rust Project Developers. See the COPYRIGHT
// file at the top-level directory of this distribution and at
// http://rust-lang.org/COPYRIGHT.
//
// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
// option. This file may not be copied, modified, or distributed
// except according to those terms.

use std::collections::HashMap;
use std::borrow::Cow;

use std::borrow::Cow::Borrowed as B;
use std::borrow::Cow::Owned as O;

type SendStr = Cow<'static, str>;

fn main() {
    let mut map: HashMap<SendStr, usize> = HashMap::new();
    assert!(map.insert(B("foo"), 42).is_none());
    assert!(map.insert(O("foo".to_string()), 42).is_some());
    assert!(map.insert(B("foo"), 42).is_some());
    assert!(map.insert(O("foo".to_string()), 42).is_some());

    assert!(map.insert(B("foo"), 43).is_some());
    assert!(map.insert(O("foo".to_string()), 44).is_some());
    assert!(map.insert(B("foo"), 45).is_some());
    assert!(map.insert(O("foo".to_string()), 46).is_some());

    let v = 46;

    assert_eq!(map.get(&O("foo".to_string())), Some(&v));
    assert_eq!(map.get(&B("foo")), Some(&v));

    let (a, b, c, d) = (50, 51, 52, 53);

    assert!(map.insert(B("abc"), a).is_none());
    assert!(map.insert(O("bcd".to_string()), b).is_none());
    assert!(map.insert(B("cde"), c).is_none());
    assert!(map.insert(O("def".to_string()), d).is_none());

    assert!(map.insert(B("abc"), a).is_some());
    assert!(map.insert(O("bcd".to_string()), b).is_some());
    assert!(map.insert(B("cde"), c).is_some());
    assert!(map.insert(O("def".to_string()), d).is_some());

    assert!(map.insert(O("abc".to_string()), a).is_some());
    assert!(map.insert(B("bcd"), b).is_some());
    assert!(map.insert(O("cde".to_string()), c).is_some());
    assert!(map.insert(B("def"), d).is_some());

    assert_eq!(map.get("abc"), Some(&a));
    assert_eq!(map.get("bcd"), Some(&b));
    assert_eq!(map.get("cde"), Some(&c));
    assert_eq!(map.get("def"), Some(&d));

    assert_eq!(map.get(&B("abc")), Some(&a));
    assert_eq!(map.get(&B("bcd")), Some(&b));
    assert_eq!(map.get(&B("cde")), Some(&c));
    assert_eq!(map.get(&B("def")), Some(&d));
}