Mistake 16 is modeling every small aggregate as a named structure. Repeated POD definitions and constructors add clutter and make simple data harder to maintain. A tuple offers a compact alternative when full class semantics are unnecessary. section 3.7
Define a tuple by listing its element types: `using Student = std::tuple<std::string, int, double>;`. Construct it like the structure version, but access values with `std::get<0>`, `std::get<1>`, and `std::get<2>` in specification order. The trade-off is that fields have no user-supplied names; structured binding is identified as a better access method. section 3.7
Student aggregate
A `Student` tuple stores `"Susan"`, `23`, and `3.85` as a string, integer, and double. A template alias can generalize the element types further, but identical tuple definitions for `Student` and `Employee` become the same type, creating a serious design risk. section 3.7
