1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
|
// Copyright 2014 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.
#![allow(unknown_features)]
#![feature(box_syntax)]
use std::thread::Thread;
use std::sync::mpsc::{channel, Sender};
#[derive(PartialEq, Show)]
enum Message {
Dropped,
DestructorRan
}
struct SendOnDrop {
sender: Sender<Message>
}
impl Drop for SendOnDrop {
fn drop(&mut self) {
self.sender.send(Message::Dropped).unwrap();
}
}
enum Foo {
SimpleVariant(Sender<Message>),
NestedVariant(Box<uint>, SendOnDrop, Sender<Message>),
FailingVariant { on_drop: SendOnDrop }
}
impl Drop for Foo {
fn drop(&mut self) {
match self {
&mut Foo::SimpleVariant(ref mut sender) => {
sender.send(Message::DestructorRan).unwrap();
}
&mut Foo::NestedVariant(_, _, ref mut sender) => {
sender.send(Message::DestructorRan).unwrap();
}
&mut Foo::FailingVariant { .. } => {
panic!("Failed");
}
}
}
}
pub fn main() {
let (sender, receiver) = channel();
{
let v = Foo::SimpleVariant(sender);
}
assert_eq!(receiver.recv().unwrap(), Message::DestructorRan);
assert_eq!(receiver.recv().ok(), None);
let (sender, receiver) = channel();
{
let v = Foo::NestedVariant(box 42u, SendOnDrop { sender: sender.clone() }, sender);
}
assert_eq!(receiver.recv().unwrap(), Message::DestructorRan);
assert_eq!(receiver.recv().unwrap(), Message::Dropped);
assert_eq!(receiver.recv().ok(), None);
let (sender, receiver) = channel();
let _t = Thread::scoped(move|| {
let v = Foo::FailingVariant { on_drop: SendOnDrop { sender: sender } };
});
assert_eq!(receiver.recv().unwrap(), Message::Dropped);
assert_eq!(receiver.recv().ok(), None);
let (sender, receiver) = channel();
let _t = {
Thread::scoped(move|| {
let mut v = Foo::NestedVariant(box 42u, SendOnDrop {
sender: sender.clone()
}, sender.clone());
v = Foo::NestedVariant(box 42u, SendOnDrop { sender: sender.clone() }, sender.clone());
v = Foo::SimpleVariant(sender.clone());
v = Foo::FailingVariant { on_drop: SendOnDrop { sender: sender } };
})
};
assert_eq!(receiver.recv().unwrap(), Message::DestructorRan);
assert_eq!(receiver.recv().unwrap(), Message::Dropped);
assert_eq!(receiver.recv().unwrap(), Message::DestructorRan);
assert_eq!(receiver.recv().unwrap(), Message::Dropped);
assert_eq!(receiver.recv().unwrap(), Message::DestructorRan);
assert_eq!(receiver.recv().unwrap(), Message::Dropped);
assert_eq!(receiver.recv().ok(), None);
}
|
