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Rollup merge of #114881 - RalfJung:cstr, r=cuviper

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clarify CStr lack of layout guarnatees

Follow-up to https://github.com/rust-lang/rust/pull/114800
r? `@cuviper`
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Matthias Krüger 2023-08-17 08:39:22 +02:00 • committed by GitHub
commit 503a8fc92d
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8
library/core/src/ffi/c_str.rs
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@ -20,10 +20,10 @@ use crate::str;
/// in each pair are borrowed references; the latter are owned
/// strings.
///
/// Note that this structure is **not** `repr(C)` and is not recommended to be
/// placed in the signatures of FFI functions. Instead, safe wrappers of FFI
/// functions may leverage the unsafe [`CStr::from_ptr`] constructor to provide
/// a safe interface to other consumers.
/// Note that this structure does **not** have a guaranteed layout (the `repr(transparent)`
/// notwithstanding) and is not recommended to be placed in the signatures of FFI functions.
/// Instead, safe wrappers of FFI functions may leverage the unsafe [`CStr::from_ptr`] constructor
/// to provide a safe interface to other consumers.
///
/// [`CString`]: ../../std/ffi/struct.CString.html
/// [`String`]: ../../std/string/struct.String.html