src/lib/zerocopy/zerocopy-derive/tests/enum_as_bytes.rs

// Copyright 2019 The Fuchsia Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

#![allow(warnings)]

use zerocopy::AsBytes;

struct IsAsBytes<T: AsBytes>(T);

// Fail compilation if `$ty: !AsBytes`.
macro_rules! is_as_bytes {
    ($ty:ty) => {
        const _: () = {
            let _: IsAsBytes<$ty>;
        };
    };
}

// An enum is AsBytes if if has a defined repr

#[derive(AsBytes)]
#[repr(C)]
enum C {
    A,
}

is_as_bytes!(C);

#[derive(AsBytes)]
#[repr(u8)]
enum U8 {
    A,
}

is_as_bytes!(U8);

#[derive(AsBytes)]
#[repr(u16)]
enum U16 {
    A,
}

is_as_bytes!(U16);

#[derive(AsBytes)]
#[repr(u32)]
enum U32 {
    A,
}

is_as_bytes!(U32);

#[derive(AsBytes)]
#[repr(u64)]
enum U64 {
    A,
}

is_as_bytes!(U64);

#[derive(AsBytes)]
#[repr(usize)]
enum Usize {
    A,
}

is_as_bytes!(Usize);

#[derive(AsBytes)]
#[repr(i8)]
enum I8 {
    A,
}

is_as_bytes!(I8);

#[derive(AsBytes)]
#[repr(i16)]
enum I16 {
    A,
}

is_as_bytes!(I16);

#[derive(AsBytes)]
#[repr(i32)]
enum I32 {
    A,
}

is_as_bytes!(I32);

#[derive(AsBytes)]
#[repr(i64)]
enum I64 {
    A,
}

is_as_bytes!(I64);

#[derive(AsBytes)]
#[repr(isize)]
enum Isize {
    A,
}

is_as_bytes!(Isize);