#include <iostream>
using namespace std;
template<class type>
class Complex
{
public:
Complex( ){real=0;imag=0;}
Complex(type r, type i){real = r; imag = i;}
Complex complex_add(Complex &c2);
void display( );
private:
type real;
type imag;
};
template<class type> //每次定義都必須寫
Complex<type> Complex<type>::complex_add(Complex<type> &c2) //模闆類的對象做傳回值!
{
Complex<type> c;
c.real = real + c2.real;
c.imag = imag + c2.imag;
return c;
}
template<class type>
void Complex<type>::display( ) //模闆類一定要清楚的寫出,而傳回值是void
{
cout << "(" << real << "," << imag << "i)" << endl;
}
int main( )
{
Complex<int> c1(3, 4), c2(5, -10), c3;
c3 = c1.complex_add(c2);
cout << "c1+c2=";
c3.display( );
Complex<double> c4(3.1, 4.4), c5(5.34, -10.21), c6;
c6 = c4.complex_add(c5);
cout << "c4+c5=";
c6.display( );
system("pause");
return 0;
}
運作結果:

感言:
小看了類模闆還真不行,以為還是極其簡單的,但實際是做了比任務一和二更多的時間,首先就是對于了解上的膚淺,泛泛的照貓畫虎,不了解實質,經過反複體會,才真正明白在類外定義的形式;其次是忘記了template的特殊,即在每次函數定義都應包含。