小白求助 关于模板类的问题

琴长不过时光

1. #include "iostream"
   
2. using std::endl;
   
3. using std::cout;
   
4. using std::cin;
   
5. using std::ostream;
   
6. 
   
7. template <typename T>
   
8. class Complex
   
9. {
   
10. private:
    
11.         T a;
    
12.         T b;
    
13. public:
    
14.         Complex(T a, T b);
    
15.         void printCom();
    
16. public:
    
17.         friend ostream& operator<<<T>(ostream& out, Complex& c);//问题出在这一行 模板类的友元函数 重载<<操作符 我看视频上 需要加上一个<T>  可是加上<T>后报错 是怎么回事
    
18.         Complex operator+(Complex& c);
    
19. };
    
20. 
    
21. template <typename T>
    
22. Complex<T>::Complex<T>(T a, T b)
    
23. {
    
24.         this->a = a;
    
25.         this->b = b;
    
26. }
    
27. 
    
28. template <typename T>
    
29. void Complex<T>::printCom()
    
30. {
    
31.         cout << this->a << " " << this->b << endl;
    
32. }
    
33. 
    
34. template <typename T>
    
35. ostream& operator<<(ostream& out, Complex<T>& c)
    
36. {
    
37.         out << c.a << " " << c.b << endl;
    
38.         return out;
    
39. }
    
40. 
    
41. template <typename T>
    
42. Complex<T> Complex<T>::operator+(Complex<T>& c)
    
43. {
    
44.         Complex<T> tmp(this->a + c.a, this->b + c.b);
    
45.         return tmp;
    
46. }
    
47. 
    
48. void main()
    
49. {
    
50.         Complex<int> c1(111, 222);
    
51.         Complex<int> c2(333, 444);
    
52.         cout << c1 << c2 << endl;
    
53. 
    
54.         Complex<int> c3 = c1 + c2;
    
55.         cout << c3 << endl;
    
56.         system("pause");
    
57. }

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梦想灬远帆

friend ostream& operator<<(ostream& out,Test<T>& t)；

琴长不过时光

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