template<class TYPE>
class bdlcc::Deque< TYPE >::DequeThrowGuard
This private class is used to manage a bsl::deque, during the course of an operation by a bdlcc::Deque. Because it has a release method, it is actually a proctor, but we call it a guard to avoid having clients confuse it with this component's Proctor and ConstProctor types. A deque that is being managed may only grow, and only on one end or the other. If a throw happens during the course of the operation and this guard's destructor is called while still managing the object, it will restore the managed object to its initial state via operations that are guaranteed not to throw.