2017.2.21

1.const成员函数不能调用非const成员变量，可以调用mutable成员变量

2.nullptr和NULL区别

3.类的指针和引用

  改变指针指向用二级指针或指针的引用（*&）

4.malloc/free 和new/delete区别

malloc/free  只会分配内存，释放内存，不会对内存进行操作

new/delete  自动调用构造析构

5.运算符重载

1.成员函数

  1 mycomplex  operator +(mycomplex adddata)
  2     {
  3         mycomplex temp;
  4         temp.x = this->x + adddata.x;
  5         temp.y = this->y + adddata.y;
  6         return temp;
  7     }

2.友元函数：可以处理不同类型

  1 friend   mycomplex  operator +(mycomplex adddata1, mycomplex adddata2);//友元函数
  2 mycomplex  operator +(mycomplex adddata1  ,mycomplex adddata2)
  3 {
  4 	mycomplex temp;
  5 	temp.x = adddata1.x + adddata2.x;
  6 	temp.y = adddata1.y + adddata2.y;
  7 	return temp;
  8 }

3.输入输出重载

  1 friend ostream & operator <<(ostream & out, mycomplex & Complex);
  2 friend istream & operator >>(istream & in, mycomplex & Complex);
  3 ostream & operator <<(ostream & out, mycomplex & Complex)
  4 {
  5 
  6 	out << Complex.x << "+" << Complex.y << "i" << std::endl;
  7 	return out;
  8 }
  9 istream & operator >>(istream & in, mycomplex & Complex)
 10 {
 11 	cout << "请输入X,Y" << endl;
 12 	in >> Complex.x >> Complex.y;
 13 	return in;
 14 }

4.++前增，后增重载

  1 TDPoint operator++();//成员函数重载前置运算符++
  2 TDPoint operator++(int);//成员函数重载后置运算符++
  3 friend TDPoint operator++(TDPoint& point);//友元函数重载前置运算符++
  4 friend TDPoint operator++(TDPoint& point,int);//友元函数重载后置运算符++

5.赋值运算符重载（深拷贝和浅拷贝）

6.下标重载

  1 char operator [] (int i);
7.new/delete重载
posted @ 2017-02-21 17:08  acliang  阅读(138)  评论(0)  编辑  收藏  举报