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explain that even addr_of cannot deref a NULL ptr

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Ralf Jung 2021-04-03 19:26:54 +02:00
parent a4a6bdd337
commit b93137a24e
1 changed files with 8 additions and 0 deletions
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8
library/core/src/ptr/mod.rs
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@ -1524,6 +1524,10 @@ fnptr_impls_args! { A, B, C, D, E, F, G, H, I, J, K, L }
/// as all other references. This macro can create a raw pointer *without* creating
/// a reference first.
///
/// Note, however, that the `expr` in `addr_of!(expr)` is still subject to all
/// the usual rules. In particular, `addr_of!(*ptr::null())` is Undefined
/// Behavior because it dereferences a NULL pointer.
///
/// # Example
///
/// ```
@ -1562,6 +1566,10 @@ pub macro addr_of($place:expr) {
/// as all other references. This macro can create a raw pointer *without* creating
/// a reference first.
///
/// Note, however, that the `expr` in `addr_of_mut!(expr)` is still subject to all
/// the usual rules. In particular, `addr_of_mut!(*ptr::null_mut())` is Undefined
/// Behavior because it dereferences a NULL pointer.
///
/// # Examples
///
/// **Creating a pointer to unaligned data:**