Several use cases around move semantic

move.cpp

#include <iostream>
#include <mutex>

struct Object
{
    Object(int id) : id(id)
    {
        std::cout << '[' << id << "] constructor" << std::endl;
    }

    Object(Object const & other) : id(other.id)
    {
        std::cout << '[' << id << "] copy constructor" << std::endl;
    }

    Object(Object && other) : id(other.id)
    {
        std::cout << '[' << id << "] move constructor" << std::endl;
        other.id = 0;
    }

    Object operator=(Object const & other)
    {
        std::cout << '[' << id << " -> " << other.id << "] copy constructor" << std::endl;
        id = other.id;
    }

    Object operator=(Object && other)
    {
        std::cout << '[' << id << " -> " << other.id << "] move assignment operator" << std::endl;
        id = other.id;
        other.id = 0;
    }

    ~Object()
    {
        std::cout << '[' << id << "] destructor" << std::endl;
    }

    int id;
};

Object obj1(100);
Object const obj2(101);


int main()
{
    Object obj3(1);
    Object obj4 = obj1;
    Object obj5 = Object(3);
    Object obj6 = std::move(Object(4));
    obj1 = obj7;
    obj2 = std::move(obj4);
}