标签：text michael cells turn const protect border width lsp
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/*
名称：C++运算符重载 作者：Michael Joessy 日期：2017-06-05 知识：给原有的运算符赋予新的功能 C++的一大特性就是重载(overload)，通过重载可以把功能相似的几个函数合为一个，使得程序更加简洁、高效。 在C++中不仅函数可以重载，而且运算符也可以重载。 运算符重载的本质：函数重载 关键字：operator 分类：成员函数重载 友元函数重载 */ #include <iostream> #include <string> using namespace std; // class Coordinate class Coordinate { //friend Coordinate& operator-(Coordinate& coor); //friend Coordinate operator+(const Coordinate& coor1, const Coordinate& coor2); friend ostream& operator<<(ostream& out, const Coordinate& coor); public: Coordinate(int nX, int nY); int getX(); int getY(); Coordinate& operator-(); Coordinate& operator++(); //前置++ Coordinate operator++(int); //后置++ Coordinate operator+(const Coordinate& coor); int operator[](int nIndex); protected: private: int m_nX; int m_nY; }; Coordinate::Coordinate( int nX, int nY ) { m_nX = nX; m_nY = nY; } Coordinate& Coordinate::operator-() { m_nX = -m_nX; m_nY = -m_nY; return *this; } Coordinate& Coordinate::operator++() { m_nX++; m_nY++; return *this; } Coordinate Coordinate::operator++( int ) { Coordinate old(*this); m_nX++; m_nY++; return old; } int Coordinate::getX() { return m_nX; } int Coordinate::getY() { return m_nY; } Coordinate Coordinate::operator+( const Coordinate& coor ) { Coordinate tmp(0, 0); tmp.m_nX = this->m_nX + coor.m_nX; tmp.m_nY = this->m_nY + coor.m_nY; return tmp; } int Coordinate::operator[]( int nIndex ) { if (0 == nIndex) { return m_nX; } else if (1 == nIndex) { return m_nY; } else { return -1; } } //Coordinate& Coordinate::operator-( Coordinate& coor ) //{ // coor.m_nX = -coor.m_nX; // coor.m_nY = -coor.m_nY; // return *this; //} //Coordinate Coordinate::operator+( const Coordinate& coor1, const Coordinate& coor2 ) //{ // Coordinate tmp(0, 0); // tmp.m_nX = coor1.m_nX + coor2.m_nX; // tmp.m_nY = coor1.m_nY + coor2.m_nY; // return tmp; //} ostream& operator<<(ostream& out, const Coordinate& coor) { out << coor.m_nX << "," << coor.m_nY; return out; } int main(void) { /************************************************************************/ /* string operator = + << /************************************************************************/ string str1("Michael"); string str2("Joessy"); string str3 = str1 + " " + str2; cout << str3 << endl; /************************************************************************/ /* 一元运算符重载 /************************************************************************/ // -(负号) Coordinate coor1(2, 3); -coor1; //coor1.operator-(); //operator-(coor1); friend cout << coor1.getX() << "," << coor1.getY() << endl; // ++(前置) ++coor1; //coor1.operator++(); cout << coor1.getX() << "," << coor1.getY() << endl; // ++(后置) coor1++; //coor1.operator++(0); cout << coor1.getX() << "," << coor1.getY() << endl; /************************************************************************/ /* 二元运算符重载 /************************************************************************/ Coordinate coorAdd1(1, 3); Coordinate coorAdd2(2, 5); Coordinate coorAddRes3(0, 0); coorAddRes3 = coorAdd1 + coorAdd2; //coorAdd1.operator+(coorAdd2) //operator+(coorAdd1, coorAdd2) friend cout << coorAddRes3.getX() << "," << coorAddRes3.getY() << endl; /************************************************************************/ /* 输出运算符重载 /* 必须使用友元运算符重载 /************************************************************************/ Coordinate coorTest(7, 8); cout << coorTest << endl; //operator<<(cout, coorTest) /************************************************************************/ /* []索引运算符重载 /* 必须使用成员运算符重载 /************************************************************************/ Coordinate coorIndex(3, 5); cout << coorIndex[0] << endl; //coorIndex.operator[](0) cout << coorIndex[1] << endl; //coorIndex.operator[](1) cin.get(); return 0; } |
标签：text michael cells turn const protect border width lsp
原文地址：http://www.cnblogs.com/MakeView660/p/6946665.html
