?? queue.h
字號:
// abstract class queue
// abstract data type specification for queue data structure
// all methods are pure virtual functions
#ifndef queue_
#define queue_
using namespace std;
template<class T>
class queue
{
public:
virtual ~queue() {}
virtual bool empty() const = 0;
// return true iff queue is empty
virtual int size() const = 0;
// return number of elements in queue
virtual T& front() = 0;
// return reference to the front element
virtual T& back() = 0;
// return reference to the back element
virtual void pop() = 0;
// remove the front element
virtual void push(const T& theElement) = 0;
// add theElement at the back of the queue
};
#endif
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