```
#include <iostream>

class Box{
public:
int x;
Box(){
    x=0;
    std::cout << "Constructor" << std::endl;
}
Box(const Box& other){
    x = other.x;
    std::cout << "Copy constructor" << std::endl;
}
Box(Box&& other){
    x = other.x;
    other.x = 0;
    std::cout << "Move constructor" << std::endl;
}

Box& operator=(Box&& other) {
    x = other.x;
    other.x = 0;
    std::cout << "Move assignment" << std::endl;
    return *this;
}

Box& operator=(const Box &other){
    x = other.x;
    std::cout << "Copy assignment" << std::endl;
}

~Box(){
    std::cout << "Destructor" << std::endl;
    x=0;
}
};
Box send(Box b){
std::cout << "Sending" << std::endl;
return b;
}
int main(){
Box b1, b2;
b1 = send(b2);
return 0;
}   

```

In the output:

```
Constructor
Constructor
Copy Constructor
Sending
Move Constructor
Move Assignment
Destructor
Destructor
Destructor
Destructor

```

I'm not too sure why a move constructor then assignment was used when doing `b1 = send(b2)`.