What is the difference between copy and move constructors?

Can you explain the difference between copy and move constructors in C++?

Sure! A copy constructor creates a new object as a copy of an existing object, while a move constructor transfers resources from one object to another.

When should I use a move constructor instead of a copy constructor?

You should use a move constructor when you want to optimize performance by transferring ownership of resources, especially with temporary objects.

Can you give me an example of each?

Of course! A copy constructor might look like this: MyClass(const MyClass &obj) { /* copy data */ }. A move constructor would be: MyClass(MyClass &&obj) { /* transfer data */ }.

What happens if I don't define a move constructor?

If you don't define a move constructor, the compiler will generate a default one, which may perform a shallow copy instead of a move, potentially leading to performance issues.