How did we ever get by without the STL? Not only is it easier and faster to write complex code, but that code is both standard and highly optimized.
std::vector<std::string> names;//...std::sort( names.begin(), names.end() );
Another nice thing about the STL is that it’s highly configurable. In the code above, we used
string’s less-than operator to sort a vector of strings, but we don’t always have a less-than operator to work with, or we may not want to sort in ascending order.
State class (which represents a state of the union) doesn’t have a less-than operator, and we probably don’t want to implement one ...