| // 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. |
| |
| // This test verifies that temporaries created for `while`'s and `if` |
| // conditions are dropped after the condition is evaluated. |
| |
| #![feature(box_syntax)] |
| |
| struct Temporary; |
| |
| static mut DROPPED: isize = 0; |
| |
| impl Drop for Temporary { |
| fn drop(&mut self) { |
| unsafe { DROPPED += 1; } |
| } |
| } |
| |
| impl Temporary { |
| fn do_stuff(&self) -> bool {true} |
| } |
| |
| fn borrow() -> Box<Temporary> { box Temporary } |
| |
| |
| pub fn main() { |
| let mut i = 0; |
| |
| // This loop's condition |
| // should call `Temporary`'s |
| // `drop` 6 times. |
| while borrow().do_stuff() { |
| i += 1; |
| unsafe { assert_eq!(DROPPED, i) } |
| if i > 5 { |
| break; |
| } |
| } |
| |
| // This if condition should |
| // call it 1 time |
| if borrow().do_stuff() { |
| unsafe { assert_eq!(DROPPED, i + 1) } |
| } |
| } |