泛型编程&&运算符重载——简单示例

朱雀 2022-12-10 03:54 111阅读 0赞

#if 0
    // 函数模板
    template<typename T>
    T max(T a, T b, T c) { 
        T max_num = a;
        if (b > max_num) max_num = b;
        if (c > max_num) max_num = c;
        return max_num;
    }
    
    // 类模板
    template<typename T1, typename T2>  //这里不能有分号
    class Point{ 
    public:
        Point(T1 x, T2 y): m_x(x), m_y(y){  }
    public:
        T1 getX() const;  //获取x坐标
        void setX(T1 x);  //设置x坐标
        T2 getY() const;  //获取y坐标
        void setY(T2 y);  //设置y坐标
    private:
        T1 m_x;  //x坐标
        T2 m_y;  //y坐标
    };
    
    template<typename T1, typename T2>  //模板头
    T1 Point<T1, T2>::getX() const /*函数头*/ { 
        return m_x;
    }
    
    template<typename T1, typename T2>
    void Point<T1, T2>::setX(T1 x){ 
        m_x = x;
    }
    
    template<typename T1, typename T2>
    T2 Point<T1, T2>::getY() const{ 
        return m_y;
    }
    
    template<typename T1, typename T2>
    void Point<T1, T2>::setY(T2 y){ 
        m_y = y;
    }
    
    int main(){ 
        Point<int, int> p1(10, 20);
        cout<<"x="<<p1.getX()<<", y="<<p1.getY()<<endl;
        Point<int, string> p2(10, "东经180度");
        cout<<"x="<<p2.getX()<<", y="<<p2.getY()<<endl;
        Point<string, string> *p3 = new Point<string, string>("东经180度", "北纬210度");
        cout<<"x="<<p3->getX()<<", y="<<p3->getY()<<endl;
        return 0;
    }
    
    #endif
    
    class complex { 
    public:
        friend complex operator + (const complex& A, const complex& B);
        complex operator + (const complex& A) const;
    private:
        double m_real;
        double m_imag;
     };
    
    complex complex::operator + (const complex& A) const { 
        complex B;
        B.m_real = this->m_real + A.m_real;
        B.m_imag = this->m_imag + A.m_imag;
        return B;
    }
    
    complex operator + (const complex& A, const complex& B) { 
        complex C;
        C.m_real = A.m_real + B.m_real;
        C.m_imag = A.m_imag + B.m_imag;
        return C;
    }