text: #include <iostream>
  #include <string_view>
  
  class Hello {
  public:
    explicit Hello(std::string_view name) : name(name) {}
  
    void say_hello() { std::cout << "Hello, " << name << "\n"; }
  
  private:
      std::string name;
  };
  
  int main(int argc, char* argv[]) {
      Hello h("world");
      h.say_hello();
      return 0;
  }
  