...one of the most highly
regarded and expertly designed C++ library projects in the
world. — Herb Sutter and Andrei
Move-assign a stream from another.
stream & operator=( stream && other);
The other stream object from which the move will occur. Must have
no outstanding asynchronous operations associated with it. Following
a valid but unspecified state where the only safe operation is destruction,
or use as the target of a move assignment.