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mongodb/docs/memory_management.md

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# Memory Management
- Avoid using bare pointers for dynamically allocated objects. Prefer `std::unique_ptr`,
`std::shared_ptr`, or another RAII class such as `BSONObj`.
- If you assign the output of `new/malloc()` directly to a bare pointer you should document where
it gets deleted/freed, who owns it along the way, and how exception safety is ensured.