lst-0039-book.cpp
// https://godbolt.org/z/MYzsqfqdo
#include <string>
#include <string_view>
using std::string; using std::string_view;
class Person { // a class starts with private visibility
string name_;
int age_;
string city_;
public: // everything from here can be used externally
Person(string_view n, int a, string_view c)
: name_{n}, age_{a}, city_{c} { }
void print();
};