43 lines
1.1 KiB
Rust
43 lines
1.1 KiB
Rust
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// Copyright 2017 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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use std::cell::Cell;
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use std::mem;
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struct Aligned<'a> {
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drop_count: &'a Cell<usize>
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}
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#[inline(never)]
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fn check_align(ptr: *const Aligned) {
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assert_eq!(ptr as usize % mem::align_of::<Aligned>(),
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0);
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}
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impl<'a> Drop for Aligned<'a> {
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fn drop(&mut self) {
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check_align(self);
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self.drop_count.set(self.drop_count.get() + 1);
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}
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}
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#[repr(packed)]
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struct Packed<'a>(u8, Aligned<'a>);
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fn main() {
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let drop_count = &Cell::new(0);
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{
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let mut p = Packed(0, Aligned { drop_count });
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p.1 = Aligned { drop_count };
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assert_eq!(drop_count.get(), 1);
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}
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assert_eq!(drop_count.get(), 2);
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}
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