008.C++类改写模板类

1.普通类

//class head
class complex
//class body {}
{
public:
    complex(double r=0, double i)
        :re(r), im(i)
    {}//构造函数
    complex& operator += (const complex&);
    double real() const { return re; }//获取实部的函数
    double imag() const { return im; }//获取虚部的函数
private:
    double re, im;

    friend complex& __doapl(complex*, const complex&);
};

2.模板类

//导入模板
template<typename T>
class complex
{
public:
    complex(T r = 0, T i = 0)
        :re(r), im(i)
    {}
    complex& operator += (const complex&);
    T real() const { return re; }
    T imag() const { return im; }
private:
    T re, im;

    friend complex& __doapl(complex*, const complex&);
};

//调用时需要制定类型<>
//{
//    complex<double> c1(2.5, 1.5);
//    complex<int> c2(2, 6);
//}