Overall guidelines
- avoid using bare pointers for dynamically allocated objects. Prefer scoped_ptr, shared_ptr, or another RAII class such as BSONObj.
- do not use auto_ptr's and refactor legacy ones out whenever possible. (Careful with c++ driver and backward compatibility though.)
- 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. If you cannot answer all three questions then you probably have a leak.
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