lst-0022-book.cpp
// https://godbolt.org/z/Y3eW1Kh8v
#include <string>
#include <iostream> // ostream
#include <format>
using std::string; using std::ostream; using std::format;
struct Person {
string name_;
int age_;
string city_;
ostream& print(ostream& os) { // method defined inline
return os << format("{} ({}) from {}", name_, age_, city_);
}
};