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explicitly mention that both components of wide prts are compared

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Ralf Jung 2022-10-26 14:20:31 +02:00
parent 99a74afa5f
commit 1946a1842e
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library/core/src/ptr/mod.rs
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@ -1733,6 +1733,7 @@ pub(crate) unsafe fn align_offset<T: Sized>(p: *const T, a: usize) -> usize {
/// by their address rather than comparing the values they point to
/// (which is what the `PartialEq for &T` implementation does).
///
/// When comparing wide pointers, both the address and the metadata are tested for equality.
/// However, note that comparing trait object pointers (`*const dyn Trait`) is unrealiable: pointers
/// to values of the same underlying type can compare inequal (because vtables are duplicated in
/// multiple codegen units), and pointers to values of *different* underlying type can compare equal