core/person1.hpp

The following code example is taken from the book
C++23 - The Complete Guide by Nicolai M. Josuttis, Leanpub, 2026
The code is licensed under a Creative Commons Attribution 4.0 International License.

---

// raw code

#include <iostream>
#include <string>

class Person {
private:
  std::string name;
public:
  Person (const std::string& n)
   : name{n} {
  }
  //...
  friend std::ostream& operator<< (std::ostream& os, const Person& p) {
    return os << '[' << p.name << ']';
  }

  void print (this const Person& self) {  // NOTE: explicit object parameter
    std::cout << self << '\n';  // delegate work to the output operator
  }

  void clear(this Person& self) {         // NOTE: explicit object parameter
    self.name = "";
  }
};