lst-0030-book.cpp
// https://godbolt.org/z/Wo8zaq9WW
#include <string>
#include <string_view>
using std::string; using sview = std::string_view;
struct Person {
string name_ = "no name";
int age_ = -1;
string city_ = "no city";
Person() {}
Person(sview n, int a, sview c)
: name_{n}, age_{a}, city_{c} { }
Person(sview n, int a)
: name_{n}, age_{a} { }
Person(sview n)
: name_{n} { }
};