| 1 | // Copyright 2024 Brian Smith. |
| 2 | // |
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| 3 | // Permission to use, copy, modify, and/or distribute this software for any |
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| 4 | // purpose with or without fee is hereby granted, provided that the above |
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| 5 | // copyright notice and this permission notice appear in all copies. |
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| 6 | // |
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| 7 | // THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHORS DISCLAIM ALL WARRANTIES |
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| 8 | // WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF |
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| 9 | // MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHORS BE LIABLE FOR ANY |
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| 10 | // SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES |
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| 11 | // WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION |
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| 12 | // OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN |
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| 13 | // CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. |
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| 14 | |
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| 15 | use crate::test; |
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| 16 | use core::{marker::PhantomData, mem::size_of}; |
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| 17 | |
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| 18 | /// A ZST that can be added to any type to make the type `!Send`. |
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| 19 | #[derive (Clone, Copy)] |
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| 20 | pub struct NotSend(PhantomData<*mut ()>); |
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| 21 | |
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| 22 | impl NotSend { |
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| 23 | pub const VALUE: Self = Self(PhantomData); |
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| 24 | } |
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| 25 | |
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| 26 | const _: () = test::compile_time_assert_clone::<NotSend>(); |
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| 27 | const _: () = test::compile_time_assert_copy::<NotSend>(); |
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| 28 | const _: () = assert!(size_of::<NotSend>() == 0); |
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| 29 | |
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