Sergey Konev
a8d83b9bab
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78 lines
1.7 KiB
Rust
78 lines
1.7 KiB
Rust
// Copyright 2019 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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#![allow(warnings)]
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#[macro_use]
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mod util;
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use std::{marker::PhantomData, option::IntoIter};
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use {static_assertions::assert_impl_all, zerocopy::FromZeroes};
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use crate::util::AU16;
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// A struct is `FromZeroes` if:
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// - all fields are `FromZeroes`
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#[derive(FromZeroes)]
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struct Zst;
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assert_impl_all!(Zst: FromZeroes);
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#[derive(FromZeroes)]
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struct One {
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a: bool,
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}
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assert_impl_all!(One: FromZeroes);
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#[derive(FromZeroes)]
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struct Two {
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a: bool,
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b: Zst,
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}
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assert_impl_all!(Two: FromZeroes);
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#[derive(FromZeroes)]
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struct Unsized {
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a: [u8],
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}
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assert_impl_all!(Unsized: FromZeroes);
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#[derive(FromZeroes)]
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struct TypeParams<'a, T: ?Sized, I: Iterator> {
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a: I::Item,
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b: u8,
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c: PhantomData<&'a [u8]>,
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d: PhantomData<&'static str>,
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e: PhantomData<String>,
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f: T,
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}
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assert_impl_all!(TypeParams<'static, (), IntoIter<()>>: FromZeroes);
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assert_impl_all!(TypeParams<'static, AU16, IntoIter<()>>: FromZeroes);
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assert_impl_all!(TypeParams<'static, [AU16], IntoIter<()>>: FromZeroes);
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// Deriving `FromZeroes` should work if the struct has bounded parameters.
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#[derive(FromZeroes)]
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#[repr(transparent)]
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struct WithParams<'a: 'b, 'b: 'a, const N: usize, T: 'a + 'b + FromZeroes>(
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[T; N],
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PhantomData<&'a &'b ()>,
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)
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where
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'a: 'b,
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'b: 'a,
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T: 'a + 'b + FromZeroes;
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assert_impl_all!(WithParams<'static, 'static, 42, u8>: FromZeroes);
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