...one of the most highly
regarded and expertly designed C++ library projects in the
world. — Herb Sutter and Andrei
Move-assign a descriptor from another.
basic_descriptor & operator=( basic_descriptor && other);
This assignment operator moves a descriptor from one object to another.
The other descriptor object from which the move will occur.
Following the move, the moved-from object is in the same state as if constructed
basic_descriptor(const executor_type&) constructor.