b517b42891
When a struct implements Drop, its fields should still drop in declaration order (just as they do when the struct does not implement Drop). Fixes #16492.
81 lines
1.9 KiB
Rust
81 lines
1.9 KiB
Rust
// 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.
|
|
|
|
// ignore-pretty
|
|
|
|
#![feature(unsafe_destructor)]
|
|
|
|
use std::rc::Rc;
|
|
use std::cell::Cell;
|
|
|
|
struct Field {
|
|
number: uint,
|
|
state: Rc<Cell<uint>>
|
|
}
|
|
|
|
impl Field {
|
|
fn new(number: uint, state: Rc<Cell<uint>>) -> Field {
|
|
Field {
|
|
number: number,
|
|
state: state
|
|
}
|
|
}
|
|
}
|
|
|
|
#[unsafe_destructor] // because Field isn't Send
|
|
impl Drop for Field {
|
|
fn drop(&mut self) {
|
|
println!("Dropping field {}", self.number);
|
|
assert_eq!(self.state.get(), self.number);
|
|
self.state.set(self.state.get()+1);
|
|
}
|
|
}
|
|
|
|
struct NoDropImpl {
|
|
_one: Field,
|
|
_two: Field,
|
|
_three: Field
|
|
}
|
|
|
|
struct HasDropImpl {
|
|
_one: Field,
|
|
_two: Field,
|
|
_three: Field
|
|
}
|
|
|
|
#[unsafe_destructor] // because HasDropImpl isn't Send
|
|
impl Drop for HasDropImpl {
|
|
fn drop(&mut self) {
|
|
println!("HasDropImpl.drop()");
|
|
assert_eq!(self._one.state.get(), 0);
|
|
self._one.state.set(1);
|
|
}
|
|
}
|
|
|
|
pub fn main() {
|
|
let state = Rc::new(Cell::new(1));
|
|
let noImpl = NoDropImpl {
|
|
_one: Field::new(1, state.clone()),
|
|
_two: Field::new(2, state.clone()),
|
|
_three: Field::new(3, state.clone())
|
|
};
|
|
drop(noImpl);
|
|
assert_eq!(state.get(), 4);
|
|
|
|
state.set(0);
|
|
let hasImpl = HasDropImpl {
|
|
_one: Field::new(1, state.clone()),
|
|
_two: Field::new(2, state.clone()),
|
|
_three: Field::new(3, state.clone())
|
|
};
|
|
drop(hasImpl);
|
|
assert_eq!(state.get(), 4);
|
|
}
|