derive_transparent.rs

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// Copyright 2019 The Fuchsia Authors

//

// Licensed under a BSD-style license <LICENSE-BSD>, Apache License, Version 2.0

// <LICENSE-APACHE or https://www.apache.org/licenses/LICENSE-2.0>, or the MIT

// license <LICENSE-MIT or https://opensource.org/licenses/MIT>, at your option.

// This file may not be copied, modified, or distributed except according to

// those terms.

extern crate zerocopy;

#[path = "../util.rs"]

mod util;

use core::marker::PhantomData;

use {

    static_assertions::assert_impl_all,

    zerocopy::{AsBytes, FromBytes, FromZeroes, Unaligned},

};

use self::util::NotZerocopy;

fn main() {}

// Test generic transparent structs

#[derive(AsBytes, FromZeroes, FromBytes, Unaligned)]

#[repr(transparent)]

struct TransparentStruct<T> {

    inner: T,

    _phantom: PhantomData<()>,

// It should be legal to derive these traits on a transparent struct, but it

// must also ensure the traits are only implemented when the inner type

// implements them.

assert_impl_all!(TransparentStruct<NotZerocopy>: FromZeroes);

assert_impl_all!(TransparentStruct<NotZerocopy>: FromBytes);

assert_impl_all!(TransparentStruct<NotZerocopy>: AsBytes);

assert_impl_all!(TransparentStruct<NotZerocopy>: Unaligned);