[jira] [Created] (ARROW-15373) [C++] MemoryManager::AllocateBuffer should return unique_ptr

["David Li (Jira)" <ji...@apache.org>]

David Li created ARROW-15373:
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             Summary: [C++] MemoryManager::AllocateBuffer should return unique_ptr
                 Key: ARROW-15373
                 URL: https://issues.apache.org/jira/browse/ARROW-15373
             Project: Apache Arrow
          Issue Type: Improvement
          Components: C++
            Reporter: David Li
            Assignee: David Li


MemoryManager::AllocateBuffer currently returns shared_ptr<Buffer>, but analogously to arrow::AllocateBuffer, it should probably return unique_ptr<Buffer>. Also, we can convert a unique_ptr to a shared_ptr but not the other way around.

This would be a breaking change in a core API, though. I _think_ this API is not used much, given it is relatively new, but we should keep this in mind.

(Context: for the Flight/UCX prototype, I'm trying to integrate MemoryManager support given UCX can transparently handle some types of non-CPU memory, but while I've used mostly unique_ptr so far, MemoryManager uses shared_ptr which did cause a small snag.)



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