parent
9bb55dc864
commit
20202da09e
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@ -1901,11 +1901,21 @@ pub unsafe fn copy_nonoverlapping<T>(src: *const T, dst: *mut T, count: usize) {
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/// ```
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/// use std::ptr;
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///
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/// /// # Safety:
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/// /// * `ptr` must be correctly aligned for its type and non-zero.
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/// /// * `ptr` must be valid for reads of `elts` contiguous objects of type `T`.
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/// /// * Those elements must not be used after calling this function.
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/// # #[allow(dead_code)]
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/// unsafe fn from_buf_raw<T>(ptr: *const T, elts: usize) -> Vec<T> {
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/// let mut dst = Vec::with_capacity(elts);
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/// dst.set_len(elts);
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///
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/// // SAFETY: Our precondition ensures the source is aligned and valid,
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/// // and `Vec::with_capacity` ensures that we have usable space to write them.
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/// ptr::copy(ptr, dst.as_mut_ptr(), elts);
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///
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/// // SAFETY: We created it with this much capacity earlier,
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/// // and the previous `copy` has initialized these elements.
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/// dst.set_len(elts);
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/// dst
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/// }
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/// ```
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