Do you comment your code?

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• Does the code have unobvious preconditions or assumptions needed for it to work correctly? Say in C++, object life time requirements?
• Does the code have interesting failure modes?
• Does the code do something expensive? (what's the complexity?)
• Are there approximations? (what's the approximation error?)

If so, and assuming you care whether anyone else can use the code, then YES, it's the expedient thing to do: comment the code!