C++ 重载有关问题

C++ 重载问题
一个sequence.h文件

C/C++ code

//in file sequence.h-----------------------------#include<iostream>typedef int ItemType;using namespace std;class Sequence{friend ostream &operator<<( ostream & out, const Sequence &aSeq);public:  /*Default constructor:   constructs an empty            Sequence object where:     capacityS == maxSize (default value 1024); itemPtr points to a dynamic array with capacityS as its capacity and      sizeS is set to 0. ------------*/   Sequence(int maxSize = 1024);  /*Destructor:  the memory dynamically allocated        by the constructor for the array pointed to by    itemPtr has been returned to the heap.-----*/   ~Sequence();  /* Copy constructor: constructs a copy of                     origSeq.-----------------------*/   Sequence(const Sequence & origSeq);     /* Assignment operator: assigns a copy of the rightSeq to the current object. A const reference to this Sequence is returned.----*/   const Sequence & operator=(const Sequence& rightSeq);       /* Returns true if the sequence is empty, false   if not.----------------*/   bool empty() const;  /* The value item is inserted into the sequence at the position determined by pos, provided there is room (i.e. sizeS < capacityS) and pos is a legal position (i.e. 0 <= pos <= sizeS).159.234-2012 Semester 22   When pos is illegal a message is display and the sequence is left unchanged.When there is no room for a new element the program terminates.---------*/   void insert(ItemType item, int pos);     /* The value at the position determined by pos is removed, provided pos is a legal position.  Otherwise a message is display and the sequence is left unchanged.--------------------------- */   void erase(int pos);/* The sequence represented by this Sequence object has been inserted into out.----------- */    void display(ostream & out) const;private:   int sizeS;          // current size of Sequence   int capacityS;      // current capacity of dynamic array   ItemType * itemPtr; // pointer to dynamic array};//info about the authors of sequence.cpp codevoid info();

下面是sequence.cpp文件，是完成他的头文件的。

C/C++ code

//Secquence main function#include <iostream>#include <cstdlib>#include "sequence.h"using namespace std;//Sequence seq;Sequence::Sequence(int maxSize){    capacityS = maxSize;    sizeS=0;//    seq.itemPtr=(ItemType*) malloc(itemPtr, maxSize * sizeof(int));    }Sequence::~Sequence(){}Sequence::Sequence(const Sequence & origSeq){    }const Sequence & operator=(const Sequence& rightSeq){    }void Sequence::insert(ItemType item, int pos){    if(item>capacityS){        cout<<"Illegal location to insert -- "<<item<<".  Sequence unchanged. ***"<<endl;    }    else{       sizeS++;       itemPtr[sizeS - 1] = item;    }}bool Sequence::empty() const{    if(itemPtr==NULL){        return true;    }    else {return false;}}//delete the element in the current positionvoid Sequence::erase (int pos){    if(pos>capacityS){        cout<<"Illegal location. Sequence unchanged."<<endl;    }    else{       for(int i=pos; i<sizeS-1; i++){            itemPtr[i]=itemPtr[i+1];           sizeS--;        }   }}

问题出现在了重载里面，他的返还值是：
const Sequence& operator=(const Sequence&)' must be a nonstatic member function
还有一个是：
const Sequence& operator=(const Sequence&)' must take exactly two arguments
求哪位大师可以帮我看看小弟那里写错了，而且重载这里面怎么写呢？？谢谢大家啦~~~

[解决办法]
在sequence.cpp中，将
const Sequence & operator=(const Sequence& rightSeq)

改为
const Sequence& Sequence::operator=(const Sequence& rightSeq)

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