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            Move-assign a ip::basic_resolver from another.
          
basic_resolver & operator=( basic_resolver && other);
This assignment operator moves a resolver from one object to another. Cancels any outstanding asynchronous operations associated with the target object.
                  The other ip::basic_resolver 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_resolver(const executor_type&)
            constructor.