如何在C++中实现运算符重载

在C++中，可以通过定义成员函数或非成员函数来实现运算符重载。以下是一些示例代码：

1. 重载加法运算符：

class Complex { private:     double real;     double imaginary; public:     Complex(double r, double i) : real(r), imaginary(i) {}      Complex operator+(const Complex& other) {         return Complex(real + other.real, imaginary + other.imaginary);     } };  int main() {     Complex c1(1, 2);     Complex c2(3, 4);     Complex result = c1 + c2;     return 0; } 

2. 重载自增运算符：

class Number { private:     int value; public:     Number(int v) : value(v) {}      Number& operator++() {         value++;         return *this;     } };  int main() {     Number num(5);     ++num;     return 0; } 

3. 重载流插入运算符：

#include <iostream>  class Complex { private:     double real;     double imaginary; public:     Complex(double r, double i) : real(r), imaginary(i) {}      friend std::ostream& operator<<(std::ostream& os, const Complex& c) {         os << c.real << " + " << c.imaginary << "i";         return os;     } };  int main() {     Complex c(1, 2);     std::cout << c << std::endl;     return 0; } 

需要注意的是，运算符重载一般应该符合运算符的原有语义，遵循常规的运算符规则，并不应该引入令人困惑的行为。