模板具体化怎么定义，看不出哪里出错了

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sumarray具体化有问题求助

1. #include <iostream>
   
2. #include <cstdlib>
   
3. using namespace std;
   
4. struct debts
   
5. {
   
6.        char name[50];
   
7.        double amount;
   
8. };
   
9. template<>double sumarray<debts>(debts ar[],int n);
   
10. template<class T>
    
11. T sumarray(T ar[],int n);
    
12. int main()
    
13. {
    
14.     int things[6] = {13,31,103,301,310,130};
    
15.     debts ded[3] =
    
16.     {
    
17.            {"Ima Wlofe",2400.0},
    
18.            {"Ura Foxe",1300.0},
    
19.            {"Iby Stout",1800.0}
    
20.     };
    
21.     double *pd[3];
    
22.     for(int i = 0;i<3;i++)
    
23.     {
    
24.             pd[i] = &ded[i].amount;
    
25.     }
    
26.     cout<<"things zong he:"<<sumarray(things,6)<<endl;
    
27.     cout<<"ded zong he:"<<sumarray(ded,3)<<endl;
    
28.     system("pause");
    
29.     return 0;
    
30. }
    
31. template<class T>
    
32. T sumarray(T ar[],int n)
    
33. {
    
34.       T re = ar[0];
    
35.       for(int i = 1;i<n;i++)
    
36.       re+=ar[i];
    
37.       return re;
    
38. }
    
39. template <> double sumarray(debts ar[],int n)
    
40. {
    
41.        double re = ar[0].amount;
    
42.        for(int i = 1;i<n;i++)
    
43.        re = re+ar[i].amount;
    
44.        return re;
    
45. }
    
46. 
    

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patton88

1. // 前置声明方式也行
   
2. 
   
3. // VS2013 Win32 Console UNICODE Success Run
   
4. 
   
5. #include <iostream>
   
6. #include <cstdlib>
   
7. using namespace std;
   
8. 
   
9. struct debts
   
10. {
    
11.         char name[50];
    
12.         double amount;
    
13. };
    
14. 
    
15. template<class T>
    
16. double sumarray(T ar[], int n);
    
17. 
    
18. template<>
    
19. double sumarray<debts>(debts ar[], int n);
    
20. 
    
21. int main()
    
22. {
    
23.         int things[6] = { 13, 31, 103, 301, 310, 130 };
    
24.         debts ded[3] =
    
25.         {
    
26.                 { "Ima Wlofe", 2400.0 },
    
27.                 { "Ura Foxe", 1300.0 },
    
28.                 { "Iby Stout", 1800.0 }
    
29.         };
    
30.         double *pd[3];
    
31.         for (int i = 0; i < 3; i++)
    
32.         {
    
33.                 pd[i] = &ded[i].amount;
    
34.         }
    
35.         cout << "things zong he:" << sumarray(things, 6) << endl;
    
36.         cout << "ded zong he:" << sumarray(ded, 3) << endl;
    
37.         system("pause");
    
38.         return 0;
    
39. }
    
40. 
    
41. template<class T>
    
42. double sumarray(T ar[], int n)
    
43. {
    
44.         double re = ar[0];
    
45.         for (int i = 1; i < n; i++)
    
46.                 re += ar[i];
    
47.         return re;
    
48. }
    
49. 
    
50. template<>
    
51. double sumarray(debts ar[], int n)
    
52. {
    
53.         double re = ar[0].amount;
    
54.         for (int i = 1; i < n; i++)
    
55.                 re = re + ar[i].amount;
    
56.         return re;
    
57. }
    
58. 
    
59. 
    
60. /* Result of Run:
    
61. 
    
62. things zong he:888
    
63. ded zong he:5500
    
64. Press any key to continue . . .
    
65. 
    
66. */
    

复制代码

patton88

1. // VS2013 Win32 Console UNICODE Success Run
   
2. 
   
3. #include <iostream>
   
4. #include <cstdlib>
   
5. using namespace std;
   
6. 
   
7. struct debts
   
8. {
   
9.         char name[50];
   
10.         double amount;
    
11. };
    
12. 
    
13. template<class T>
    
14. double sumarray(T ar[], int n)
    
15. {
    
16.         double re = ar[0];
    
17.         for (int i = 1; i < n; i++)
    
18.                 re += ar[i];
    
19.         return re;
    
20. }
    
21. 
    
22. template<>
    
23. double sumarray(debts ar[], int n)
    
24. {
    
25.         double re = ar[0].amount;
    
26.         for (int i = 1; i < n; i++)
    
27.                 re = re + ar[i].amount;
    
28.         return re;
    
29. }
    
30. 
    
31. int main()
    
32. {
    
33.         int things[6] = { 13, 31, 103, 301, 310, 130 };
    
34. 
    
35.         debts ded[3] =
    
36.         {
    
37.                 { "Ima Wlofe", 2400.0 },
    
38.                 { "Ura Foxe", 1300.0 },
    
39.                 { "Iby Stout", 1800.0 }
    
40.         };
    
41. 
    
42.         double *pd[3];
    
43.        
    
44.         for (int i = 0; i < 3; i++)
    
45.         {
    
46.                 pd[i] = &ded[i].amount;
    
47.         }
    
48.        
    
49.         cout << "things zong he:" << sumarray(things, 6) << endl;
    
50.         cout << "ded zong he:" << sumarray(ded, 3) << endl;
    
51. 
    
52.         system("pause");
    
53.         return 0;
    
54. }
    
55. 
    
56. /* Result of Run:
    
57. 
    
58. things zong he:888
    
59. ded zong he:5500
    
60. Press any key to continue . . .
    
61. 
    
62. */

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花开自有丶花落

patton88 发表于 2016-8-3 21:14

前几天没看，试了一下编译过了，就给你，刚刚看了，这个程序的问题是函数模板的返回类型不能用T代替吧？谢谢啦

patton88

花开自有丶花落 发表于 2016-8-6 17:00
前几天没看，试了一下编译过了，就给你，刚刚看了，这个程序的问题是函数模板的返回类型不能用T代替吧？ ...

多交流，共同学习

花开自有丶花落

patton88 发表于 2016-8-6 19:45
多交流，共同学习

yintotti

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