68 lines
2.2 KiB
Rust
68 lines
2.2 KiB
Rust
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// Copyright 2026 The Fuchsia Authors
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//
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// Licensed under a BSD-style license <LICENSE-BSD>, Apache License, Version 2.0
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// <LICENSE-APACHE or https://www.apache.org/licenses/LICENSE-2.0>, or the MIT
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// license <LICENSE-MIT or https://opensource.org/licenses/MIT>, at your option.
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// This file may not be copied, modified, or distributed except according to
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// those terms.
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extern crate zerocopy;
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#[allow(unused)]
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#[cfg(feature = "derive")]
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mod util {
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/// A type that doesn't implement any zerocopy traits.
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pub struct NotZerocopy<T = ()>(pub T);
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/// A `u16` with alignment 2.
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///
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/// Though `u16` has alignment 2 on some platforms, it's not guaranteed. By
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/// contrast, `util::AU16` is guaranteed to have alignment 2.
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#[derive(
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zerocopy::KnownLayout,
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zerocopy::Immutable,
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zerocopy::FromBytes,
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zerocopy::IntoBytes,
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Copy,
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Clone,
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)]
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#[repr(C, align(2))]
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pub struct AU16(pub u16);
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// Since we can't import these by path (ie, `util::assert_impl_all!`), use a
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// name prefix to ensure our derive-emitted code isn't accidentally relying
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// on `assert_impl_all!` being in scope.
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#[macro_export]
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macro_rules! util_assert_impl_all {
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($type:ty: $($trait:path),+ $(,)?) => {
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const _: fn() = || {
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use ::core::prelude::v1::*;
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::static_assertions::assert_impl_all!($type: $($trait),+);
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};
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};
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}
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// Since we can't import these by path (ie, `util::assert_not_impl_any!`),
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// use a name prefix to ensure our derive-emitted code isn't accidentally
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// relying on `assert_not_impl_any!` being in scope.
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#[macro_export]
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macro_rules! util_assert_not_impl_any {
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($x:ty: $($t:path),+ $(,)?) => {
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const _: fn() = || {
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use ::core::prelude::v1::*;
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::static_assertions::assert_not_impl_any!($x: $($t),+);
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};
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};
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}
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#[macro_export]
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macro_rules! test_trivial_is_bit_valid {
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($x:ty => $name:ident) => {
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#[test]
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fn $name() {
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util::test_trivial_is_bit_valid::<$x>();
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}
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};
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}
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}
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