MyVector

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#pragma once/*  T*buff;                         //数组名unsigned int size;              //容量unsigned int len;               //数组长度*/template<class T>class MyVector{   size_t size;//容量    size_t len;//数组长度    T*buff;//数组名public:    MyVector();    ~MyVector()    { _clear();}    //迭代器    class MyIterator     {        T*it;    public:        MyIterator() { it = NULL; }        MyIterator(MyIterator&temp) { this->it = temp.buff; }        ~MyIterator(){ it = NULL; }        void operator=(const T*p)//赋值        { it = (T*)p; }        bool operator!=(T*temp)//不等于        { return (it != temp); }        T& operator*()const//解引用        { return *it; }        MyIterator& operator++()//前加加         { it++; return *this; }        MyIterator& operator--()//前减减         { it--; return *this; }        MyIterator& operator++(int) //后加加        {            MyIterator *temp = new MyIterator;            temp->it = it;  this->it++;                 return *temp;        }        MyIterator& operator--(int) //后减减        {            MyIterator *temp = new MyIterator;            temp->it = it;  this->it--;            return *temp;        }    };    //MyItretor结束******************************    T& operator[](int i)const               //下标    { return buff[i]; }    T* begin()const                         //返回数组首地址    { return buff; }    T* end()const                           //返回数组末尾地址    { return (buff + len); }    size_t getLen()                         //返回数组长度    { return len; }    size_t getSize()                        //返回数组大小    { return size; }    void _alloc();                          //开内存    MyVector& _cp(const MyVector&);         //拷贝    void push_back(const T& data);          //插入数据    void _clear();                          //清空所有数据    T& at(int);                             //代检查的下标    bool empty();                           //判断容器是否为空,如果为空返回true       void swap(MyVector<T>&);                //交换两个容器    void swap(size_t, size_t);              //交换一个数组中的两个元素    MyVector& operator+=(const MyVector&);  //数组连接};template<class T>MyVector<T>::MyVector(){    buff = NULL;    size = len = 0;}//开内存template<class T>void MyVector<T>::_alloc(){    if (len >= size)    {        size = size + ((size >> 1) > 1 ? size >> 1 : 1);        buff = (T*)realloc(buff, sizeof(T)*size);    }}//插入数据template<class T>void MyVector<T>::push_back(const T& data){    _alloc();    buff[len++] = data; }//清空所有数据template<class T>void MyVector<T>::_clear(){    if (buff)        free(buff);    size = len = 0;    buff = NULL;}//代检查的下标template<class T>T& MyVector<T>::at(int i){    if (i < 0 || i >= len)        printf("\a越界了!\n");    return buff[i];}//判断容器是否为空,如果为空返回truetemplate<class T>bool MyVector<T>::empty()   {    if (buff)        return 0;    return 1;}//两个容器间的拷贝template<class T>MyVector<T>& MyVector<T>::_cp(const MyVector<T>&temp){    _clear();    size = len = temp.len;    _alloc();    for (int i = 0; i < len; i++)        this->buff[i] = temp.buff[i];    return *this;}//交换两个容器template<class T>void MyVector<T>::swap(MyVector<T>& tempVector){    MyVector temp;    temp._cp(*this);    this->_cp(tempVector);    tempVector._cp(temp);    temp._clear();}//交换一个数组中的两个元素template<class T>void MyVector<T>::swap(size_t subscript, size_t subscript2){    T temp = buff[subscript];    buff[subscript] = buff[subscript2];    buff[subscript2] = temp;}//数组连接template<class T>MyVector<T>&MyVector<T>::operator+=(const MyVector<T>&temp){    size_t tempLen = len;    size = len += temp.len;    _alloc();    for (size_t i = tempLen, j = 0; i < len; i++, j++)        buff[i] = temp.buff[j];    return *this;}
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