rust/src/test/run-pass/deriving-with-repr-packed.rs
2017-11-26 16:12:43 +02:00

46 lines
1.2 KiB
Rust

// 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.
// check that derive on a packed struct does not call field
// methods with a misaligned field.
use std::mem;
#[derive(Copy, Clone)]
struct Aligned(usize);
#[inline(never)]
fn check_align(ptr: *const Aligned) {
assert_eq!(ptr as usize % mem::align_of::<Aligned>(),
0);
}
impl PartialEq for Aligned {
fn eq(&self, other: &Self) -> bool {
check_align(self);
check_align(other);
self.0 == other.0
}
}
#[repr(packed)]
#[derive(Copy, Clone, PartialEq)]
struct Packed(Aligned, Aligned);
#[derive(PartialEq)]
#[repr(C)]
struct Dealigned<T>(u8, T);
fn main() {
let d1 = Dealigned(0, Packed(Aligned(1), Aligned(2)));
let ck = d1 == d1;
assert!(ck);
}