jhorstmann commented on issue #6362:
URL: https://github.com/apache/arrow-rs/issues/6362#issuecomment-2338282717
At a glance, this looks correct. I use it like the following, where `v` is
an `Arc<Vec<T, Allocator>>`:
```rust
let len = v.len() * std::mem::size_of::<T>();
let buffer = unsafe {
let ptr = NonNull::new_unchecked(v.as_ptr() as *mut u8);
Buffer::from_custom_allocation(ptr, len, v)
};
```
I'm being careful here to not use any references to the vector while a
mutable pointer exists, as that could lead to undefined behavior. But that does
not seem to be the problem here. Maybe the issue is with the `into_vec` method
instead?
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