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// Copyright 2019 The Fuchsia Authors
//
// Licensed under a BSD-style license <LICENSE-BSD>, Apache License, Version 2.0
// This file may not be copied, modified, or distributed except according to
// those terms.
#![allow(warnings)]
use std::{marker::PhantomData, option::IntoIter};
use {static_assertions::assert_impl_all, zerocopy::AsBytes};
// A union is `AsBytes` if:
// - all fields are `AsBytes`
// - `repr(C)` or `repr(transparent)` and
// - no padding (size of union equals size of each field type)
// - `repr(packed)`
#[derive(AsBytes, Clone, Copy)]
#[repr(C)]
union CZst {
a: (),
}
assert_impl_all!(CZst: AsBytes);
#[derive(AsBytes)]
#[repr(C)]
union C {
a: u8,
b: u8,
}
assert_impl_all!(C: AsBytes);
// Transparent unions are unstable; see issue #60405
// #[derive(AsBytes)]
// #[repr(transparent)]
// union Transparent {
// a: u8,
// b: CZst,
// }
// is_as_bytes!(Transparent);
#[derive(AsBytes)]
#[repr(C, packed)]
union CZstPacked {
a: (),
}
assert_impl_all!(CZstPacked: AsBytes);
#[derive(AsBytes)]
#[repr(C, packed)]
union CPacked {
a: u8,
b: i8,
}
assert_impl_all!(CPacked: AsBytes);
#[derive(AsBytes)]
#[repr(C, packed)]
union CMultibytePacked {
a: i32,
b: u32,
c: f32,
}
assert_impl_all!(CMultibytePacked: AsBytes);