41 lines
967 B
Rust
41 lines
967 B
Rust
// Copyright 2012 The Rust Project Developers. See the COPYRIGHT
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// file at the top-level directory of this distribution and at
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// http://rust-lang.org/COPYRIGHT.
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//
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// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
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// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
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// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
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// option. This file may not be copied, modified, or distributed
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// except according to those terms.
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// xfail-fast
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struct Arg<T> {val: T, fin: extern fn(T)}
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struct finish<T> {
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arg: Arg<T>
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}
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#[unsafe_destructor]
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impl<T:Copy> Drop for finish<T> {
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fn finalize(&self) {
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unsafe {
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(self.arg.fin)(self.arg.val);
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}
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}
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}
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fn finish<T:Copy>(arg: Arg<T>) -> finish<T> {
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finish {
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arg: arg
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}
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}
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pub fn main() {
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let box = @mut 10;
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fn dec_box(i: @mut int) { *i -= 1; }
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{ let _i = finish(Arg{val: box, fin: dec_box}); }
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assert!((*box == 9));
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}
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