C++中的自定义函数返回类型

#include <iOStream>
using namespace std;
 
//通过设置一个只有构造函数的类，建立一个自定义的返回值类型
class Returndata
{
public:
  int id;
  string name;
 
public:
  Returndata(int id, string name)
  {
    this->id = id;
    this->name = name;
  }
};
 
Returndata createdata(int id, string name)
{
  Returndata newdata(id, name);
 
  return newdata;
}
 
 
int main()
{
  Returndata a = createdata(1, "bob");
  cout << a.id << " " << a.name << endl;
  return 0;
}

struct Returndata
{
  int id;
  string name;
};
 
Returndata createdata(int id, string name)
{
  //Returndata newdata(id, name);
  Returndata newdata = {id, name};
  //newdata.id = id;
  //newdata.name = name; 
  return newdata;
} 
 
int main()
{
  Returndata a;
  a = createdata(1, "bob");
  cout << a.id << " " << a.name << endl;
  return 0;
}

class Person { 
Person(int age) {//构造函数 
cout << "param constructor!" << endl; 
mAge = age; 
}
 
public: 
Person(const Person& person) { //拷贝构造函数 
mAge = person.mAge; 
}
 
public: 
int mAge; 
};
 
Person MyFunc() {//返回值为非引用自定义类的函数 
Person q(10); 
return q; 
}

Person p = MyFunc();

Person& MyFunc() {//返回值为引用自定义类的函数 
Person q(10); 
return q; 
}

Person p = MyBusiness();