C++11 provides move semantics through a move constructor and a move assignment operator, which are called when a temporary object is used either to create another object or to be assigned to an existing object. In both cases, because the temporary object will not live beyond the statement, the contents of the temporary can be moved to the other object, leaving the temporary object in an invalid state. The compiler will create these functions for you through the default action of moving the data from the temporary to the newly created (or the assigned to) object.
You can write your own versions, and to indicate move semantics these have a parameter that is an rvalue reference (&&).
If you want the compiler to provide you with ...
