Move-construct a stream handle from a handle of another executor type.
template< typename Executor1> basic_stream_handle( basic_stream_handle< Executor1 > && other, typename constraint< is_convertible< Executor1, Executor >::value, defaulted_constraint >::type = defaulted_constraint());
This constructor moves a stream handle from one object to another.
The other stream handle object from which the move will occur.
Following the move, the moved-from object is in the same state as if
constructed using the basic_stream_handle(const executor_type&)
constructor.