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take more clarifying text from Gankra's PR

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original source: https://github.com/rust-lang/rust/pull/95851
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Ralf Jung 2023-09-26 16:41:06 +02:00
parent 6c73f254b9
commit 9b7f9c4328
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7
library/core/src/ptr/const_ptr.rs
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@ -611,6 +611,13 @@ impl<T: ?Sized> *const T {
/// except that it has a lot more opportunities for UB, in exchange for the compiler
/// better understanding what you are doing.
///
/// The primary motivation of this method is for computing the `len` of an array/slice
/// of `T` that you are currently representing as a "start" and "end" pointer
/// (and "end" is "one past the end" of the array).
/// In that case, `end.offset_from(start)` gets you the length of the array.
///
/// All of the following safety requirements are trivially satisfied for this usecase.
///
/// [`offset`]: #method.offset
///
/// # Safety