What are some guidelines / "rules of thumb" for overloading operators?, C++ FAQ

C++ FAQ

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FAQ: What are some guidelines / "rules of thumb" for overloading operators? ←(in the new Super-FAQ)

It's in Section: Operator overloading:

FAQ: What's the deal with operator overloading?
FAQ: What are the benefits of operator overloading?
FAQ: What are some examples of operator overloading?
FAQ: Is operator overloading supposed to make the class' code clearer?
FAQ: What operators can/cannot be overloaded?
FAQ: Overloading operator== to use string comparison?
FAQ: Can I create operator** for to-the-power-of?
FAQ: But which operators should I override?
FAQ: Guidelines / "rules of thumb" for overloading operators? (this FAQ)
FAQ: Creating a subscript operator for a Matrix class?
FAQ: Should my Matrix interface look like an array-of-array?
FAQ: Part two of making my Matrix interface look like an array-of-array?
FAQ: Designing classes from the outside-in vs. inside-out?
FAQ: Overloading prefix/postfix forms of operators ++ and --?
FAQ: Which is more efficient: i++ or ++i?