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generational-arena
Discontinued A safe arena allocator that allows deletion without suffering from the ABA problem by using generational indices.
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I think you can use slice-dst which embed the size of the array in the heap allocation and returns a thin pointer
If you cannot inplace construct the slice-dst on heap and your slice is too large to be copied, then I think there are two solutions: - Using Box>, this adds another level of indirection but avoids the copying - Use an arena like slotmap, slab, generational_arena or concurrent_arena to store the Box<[u8]>. It still needs heap allocation, but it allocates in chunks, thus less fragmentation and performs better.