89   stack<WalkState<T> >* stack_;
133   stack_ = new stack<WalkState<T> >;  in Walker()
139   delete stack_;  in ~Walker()  local
146   if (stack_ && stack_->size() > 0) {  in Reset()
148     while (stack_->size() > 0) {  in Reset()
149       delete stack_->top().child_args;  in Reset()
150       stack_->pop();  in Reset()
164   stack_->push(WalkState<T>(re, top_arg));  in WalkInternal()
169     s = &stack_->top();  in WalkInternal()
200               stack_->push(WalkState<T>(sub[s->n], s->pre_arg));  in WalkInternal()
215     stack_->pop();  in WalkInternal()
216     if (stack_->size() == 0)  in WalkInternal()
218     s = &stack_->top();  in WalkInternal()