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// Copyright 2017 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.
#![feature(generators, generator_trait)]
use std::ops::Generator;
use std::sync::atomic::{AtomicUsize, ATOMIC_USIZE_INIT, Ordering};
static A: AtomicUsize = ATOMIC_USIZE_INIT;
struct B;
impl Drop for B {
fn drop(&mut self) {
A.fetch_add(1, Ordering::SeqCst);
}
}
fn test() -> bool { true }
fn test2() -> bool { false }
fn main() {
t1();
t2();
}
fn t1() {
let mut a = || {
let b = B;
if test() {
drop(b);
}
yield;
};
let n = A.load(Ordering::SeqCst);
unsafe { a.resume() };
assert_eq!(A.load(Ordering::SeqCst), n + 1);
unsafe { a.resume() };
assert_eq!(A.load(Ordering::SeqCst), n + 1);
}
fn t2() {
let mut a = || {
let b = B;
if test2() {
drop(b);
}
yield;
};
let n = A.load(Ordering::SeqCst);
unsafe { a.resume() };
assert_eq!(A.load(Ordering::SeqCst), n);
unsafe { a.resume() };
assert_eq!(A.load(Ordering::SeqCst), n + 1);
}
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