What is the definition of the operator < for std::set that uses pointers?

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The operator < for std::set that uses pointers is a comparison operator that compares two pointers. It compares the addresses the pointers point to, not the values held in the memory the pointers point. The comparison is typically defined as a lexicographical comparison, meaning it compares the pointers from left to right until a difference is found. If both pointers are equal or the first arguments points to an object with a lower address than the second argument, the function returns true, otherwise it returns false.