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BytesMut: Assert alignment of Shared #652

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Jan 19, 2024
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BytesMut: Assert alignment of Shared #652

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6 changes: 6 additions & 0 deletions src/bytes_mut.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -80,6 +80,12 @@ struct Shared {
ref_count: AtomicUsize,
}

// Assert that the alignment of `Shared` is divisible by 2.
// This is a necessary invariant since we depend on allocating `Shared` a
// shared object to implicitly carry the `KIND_ARC` flag in its pointer.
// This flag is set when the LSB is 0.
const _: [(); 0 - mem::align_of::<Shared>() % 2] = []; // Assert that the alignment of `Shared` is divisible by 2.

// Buffer storage strategy flags.
const KIND_ARC: usize = 0b0;
const KIND_VEC: usize = 0b1;
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