lst-0021-book.cpp
// https://godbolt.org/z/a7q5xsWGj
// Excerpt …
std::ostream& print(std::ostream& os);
};
std::ostream& Person::print(std::ostream& os) {
return os << format("{} ({}) from {}", name_, age_, city_);
}
std::ostream& operator<<(std::ostream& os, Person p) {
return p.print(os);
}
int main() {
Person paul {"Paul", 23, "Irvine"};
cout << "You are " << paul << ", right?\n";
}