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Diffstat (limited to 'tests/union_known_layout.rs')
-rw-r--r-- | tests/union_known_layout.rs | 65 |
1 files changed, 65 insertions, 0 deletions
diff --git a/tests/union_known_layout.rs b/tests/union_known_layout.rs new file mode 100644 index 0000000..337ab4a --- /dev/null +++ b/tests/union_known_layout.rs @@ -0,0 +1,65 @@ +// Copyright 2022 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)] + +#[macro_use] +mod util; + +use std::{marker::PhantomData, option::IntoIter}; + +use {static_assertions::assert_impl_all, zerocopy::KnownLayout}; + +#[derive(Clone, Copy, KnownLayout)] +union Zst { + a: (), +} + +assert_impl_all!(Zst: KnownLayout); + +#[derive(KnownLayout)] +union One { + a: bool, +} + +assert_impl_all!(One: KnownLayout); + +#[derive(KnownLayout)] +union Two { + a: bool, + b: Zst, +} + +assert_impl_all!(Two: KnownLayout); + +#[derive(KnownLayout)] +union TypeParams<'a, T: Copy, I: Iterator> +where + I::Item: Copy, +{ + a: T, + c: I::Item, + d: u8, + e: PhantomData<&'a [u8]>, + f: PhantomData<&'static str>, + g: PhantomData<String>, +} + +assert_impl_all!(TypeParams<'static, (), IntoIter<()>>: KnownLayout); + +// Deriving `KnownLayout` should work if the union has bounded parameters. + +#[derive(KnownLayout)] +#[repr(C)] +union WithParams<'a: 'b, 'b: 'a, const N: usize, T: 'a + 'b + KnownLayout> +where + 'a: 'b, + 'b: 'a, + T: 'a + 'b + Copy + KnownLayout, +{ + a: [T; N], + b: PhantomData<&'a &'b ()>, +} + +assert_impl_all!(WithParams<'static, 'static, 42, u8>: KnownLayout); |