目录

1. 运算符2. 自定义数据类型与运算符重载3. 运算符重载4. 运算符重载为普通函数5. 运算符重载为成员函数

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1. 运算符

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2. 自定义数据类型与运算符重载

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3. 运算符重载

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4. 运算符重载为普通函数

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class Complex{ public: Complex(double r = 0.0, double i = 0.0){ real = r; imaginary = i; } double real; //real part double imaginary; //imaginary part }; Complex operator+ (const Complex & a, const Complex & b) { return Complex(a.real + b.real, a.imaginary + b.imaginary); }//"类名(参数表)"就代表一个对象 Complex a(1,2), b(2, 3), c; c = a + b;//相当于什么？

重载为普通函数时，参数个数为运算符目数

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5. 运算符重载为成员函数

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class Complex{ public: Complex(double r = 0.0, double m = 0.0): real(r), imaginary(m){ } //constructor Complex operator+(const Complex &); //addition Complex operator-(const Complex &); //subtraction private: double real; //real part double imaginary; //imaginary part }; //Overloaded addition operator Complex Complex::operator+(const Complex & operand2){ return Complex(real + operand2.real, imaginary + operand2.imaginary); } //Overloaded subtraction operator Complex Complex::operator-(const Complex & operand2){ return Complex(real - operand2.real, imaginary - operand2.imaginary); } int main(){ Complex x, y(4.3, 8.2), z(3.3, 1.1); x = y + z; x = y - Z; return 0; }

重载为成员函数时，参数个数为运算符数目减一

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站在巨人的肩上 【1】北京大学信息技术学院《程序设计实习》