c++ - 错误: … was not declared in this scope

Question

我正在使用C++进行队列处理，但出现一些奇怪的编译错误问题:

Queue.h:37:49: error: expected "," or "..." before "<" token
Queue.h: In copy constructor "Queue::Queue(Queue&)":
Queue.h:39:11: error: "other" was not declared in this scope
Queue.h: At global scope:
Queue.h:42:72: error: expected "," or "..." before "<" token
Queue.h: In member function "Queue& Queue::operator=(const Queue&)":
Queue.h:44:11: error: "other" was not declared in this scope

有人可以帮忙吗？

#if !defined QUEUE_SIZE
#define QUEUE_SIZE 30
#endif

template <class TYPE> class Queue
{
 private:
  TYPE *array;
 public:
  Queue(Queue& other);
  Queue();
  ~Queue();
  Queue& operator=(const Queue& other);
  TYPE pushAndPop(TYPE x);
};

template <class TYPE> Queue<TYPE>::Queue()
{
  array=new TYPE[QUEUE_SIZE];
}

template <class TYPE> Queue<TYPE>::~Queue()
{
  delete [] array;
}

template <class TYPE> TYPE Queue<TYPE>::pushAndPop(TYPE other)
{
  TYPE item = array[0];
  for(int x = 0; x<QUEUE_SIZE-1; x++){
    array[x]= array[x+1];
  }
  array[QUEUE_SIZE-1] = other;
  return item;
}

template <class TYPE> Queue<TYPE>:: Queue(Queue&<TYPE> other)
{
  array = other.array;
}

template <class TYPE> Queue<TYPE>& Queue<TYPE>:: operator=(const Queue&<TYPE> other)
{
  array = other->array;
}

Answer 1

您将和放在错误的位置:

更新

template <class TYPE> Queue<TYPE>:: Queue(Queue&<TYPE> other)
                                               ^^
{
  array = other.array;
}

template <class TYPE> Queue<TYPE>& Queue<TYPE>:: operator=(const Queue&<TYPE> other)
                                                                      ^^^
{
  array = other->array;    // other is a reference, not pointer
               ^^^
}

至

template <class TYPE> Queue<TYPE>:: Queue(Queue<TYPE>& other)
{
  //array = other.array;
}

template <class TYPE> Queue<TYPE>& Queue<TYPE>:: operator=(const Queue<TYPE>& other)
{
  // check that it's not self-assign
  // make sure you release current memory
  // allocate new memory
  // copy over content of array
  // array = other.array;
}