{

public:

int a;

Example():a(20){std::cout<<"def const"<<std::endl;}

Example(const Example& ex){std::cout<<"copy const"<<std::endl;}

//Example(const Example&& ex):a(std::move(ex.a)){std::cout<<"move const"<<std::endl;}

Example(const Example&& ex){std::cout<<"move const"<<std::endl;}

{

public:

//using Example::Example;

int a2;

Example2():a2(2){std::cout<<"def2 const"<<std::endl;}

Example2(const Example2& ex):Example(ex) {std::cout<<"copy2 const"<<std::endl;}

Example2(const Example2&& ex):Example(std::move(ex)){std::cout<<"move2 const"<<std::endl;}

{

Example2 ex2;

Example2 ex3 = std::move(ex2);

ex3.a2 = 1;

std::cout<<ex3.a2<<" "<<ex3.a<<std::endl;

std::cout<<ex2.a2<<" "<<ex2.a<<std::endl;

ex2.a = 3;

std::cout<<ex2.a2<<" "<<ex2.a<<std::endl;