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Rollup merge of #136359 - hkBst:ptr_copy_docs, r=Amanieu

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doc all differences of ptr:copy(_nonoverlapping) with memcpy and memmove

Fixes #79430
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Jacob Pratt 2025-03-16 21:47:42 -04:00 • committed by GitHub
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9
library/core/src/intrinsics/mod.rs
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@ -3641,7 +3641,8 @@ pub const fn ptr_metadata<P: ptr::Pointee<Metadata = M> + ?Sized, M>(ptr: *const
/// For regions of memory which might overlap, use [`copy`] instead. /// For regions of memory which might overlap, use [`copy`] instead.
/// ///
/// `copy_nonoverlapping` is semantically equivalent to C's [`memcpy`], but /// `copy_nonoverlapping` is semantically equivalent to C's [`memcpy`], but
/// with the argument order swapped. /// with the source and destination arguments swapped,
/// and `count` counting the number of `T`s instead of bytes.
/// ///
/// The copy is "untyped" in the sense that data may be uninitialized or otherwise violate the /// The copy is "untyped" in the sense that data may be uninitialized or otherwise violate the
/// requirements of `T`. The initialization state is preserved exactly. /// requirements of `T`. The initialization state is preserved exactly.
@ -3761,8 +3762,10 @@ pub const unsafe fn copy_nonoverlapping<T>(src: *const T, dst: *mut T, count: us
/// If the source and destination will *never* overlap, /// If the source and destination will *never* overlap,
/// [`copy_nonoverlapping`] can be used instead. /// [`copy_nonoverlapping`] can be used instead.
/// ///
/// `copy` is semantically equivalent to C's [`memmove`], but with the argument /// `copy` is semantically equivalent to C's [`memmove`], but
/// order swapped. Copying takes place as if the bytes were copied from `src` /// with the source and destination arguments swapped,
/// and `count` counting the number of `T`s instead of bytes.
/// Copying takes place as if the bytes were copied from `src`
/// to a temporary array and then copied from the array to `dst`. /// to a temporary array and then copied from the array to `dst`.
/// ///
/// The copy is "untyped" in the sense that data may be uninitialized or otherwise violate the /// The copy is "untyped" in the sense that data may be uninitialized or otherwise violate the