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Rollup merge of #146846 - hkBst:btree-2, r=tgross35

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btree InternalNode::new safety comments
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Stuart Cook 2025-09-22 20:25:16 +10:00 • committed by GitHub
commit 8cf94b6c82
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5
library/alloc/src/collections/btree/node.rs
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@ -117,10 +117,11 @@ impl<K, V> InternalNode<K, V> {
/// initialized and valid edge. This function does not set up
/// such an edge.
unsafe fn new<A: Allocator + Clone>(alloc: A) -> Box<Self, A> {
let mut node = Box::<Self, _>::new_uninit_in(alloc);
unsafe {
let mut node = Box::<Self, _>::new_uninit_in(alloc);
// We only need to initialize the data; the edges are MaybeUninit.
// SAFETY: argument points to the `node.data` `LeafNode`
LeafNode::init(&raw mut (*node.as_mut_ptr()).data);
// SAFETY: `node.data` was just initialized and `node.edges` is MaybeUninit.
node.assume_init()
}
}