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  1. // twoswap.cpp -- specialization overrides a template
  2. #include <iostream>
  3. template <typename T>
  4. void Swap(T &a, T &b);
  5.  
  6. struct job
  7. {
  8.     char name[40];
  9.     double salary;
  10.     int floor;
  11. };
  12.  
  13. // explicit specialization
  14. template <typename job>
  15. void Swap(job &j1, job &j2);
  16. void Show(job &j);
  17.  
  18. int main()
  19. {
  20.     using namespace std;
  21.     cout.precision(2);
  22.     cout.setf(ios::fixed, ios::floatfield);
  23.     int i = 10, j = 20;
  24.     cout << "i, j = " << i << ", " << j << ".\n";
  25.     cout << "Using compiler-generated int swapper:\n";
  26.     Swap(i,j);    // generates void Swap(int &, int &)
  27.     cout << "Now i, j = " << i << ", " << j << ".\n";
  28.  
  29.     job sue = {"Susan Yaffee", 73000.60, 7};
  30.     job sidney = {"Sidney Taffee", 78060.72, 9};
  31.     cout << "Before job swapping:\n";
  32.     Show(sue);
  33.     Show(sidney);
  34.     Swap(sue, sidney); // uses void Swap(job &, job &)
  35.     cout << "After job swapping:\n";
  36.     Show(sue);
  37.     Show(sidney);
  38.     // cin.get();
  39.     return 0;
  40. }
  41.  
  42. template <typename T>
  43. void Swap(T &a, T &b)    // general version
  44. {
  45.     T temp;
  46.     temp = a;
  47.     a = b;
  48.     b = temp;
  49. }
  50.  
  51. // swaps just the salary and floor fields of a job structure
  52.  
  53. void Swap(job &j1, job &j2)  // specialization
  54. {
  55.     double t1;
  56.     int t2;
  57.     t1 = j1.salary;
  58.     j1.salary = j2.salary;
  59.     j2.salary = t1;
  60.     t2 = j1.floor;
  61.     j1.floor = j2.floor;
  62.     j2.floor = t2;
  63. }
  64.  
  65. void Show(job &j)
  66. {
  67.     using namespace std;
  68.     cout << j.name << ": $" << j.salary
  69.          << " on floor " << j.floor << endl;
  70. }
  71.  
Success #stdin #stdout 0s 4728KB
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stdin
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Standard input is empty
stdout
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i, j = 10, 20.
Using compiler-generated int swapper:
Now i, j = 20, 10.
Before job swapping:
Susan Yaffee: $73000.60 on floor 7
Sidney Taffee: $78060.72 on floor 9
After job swapping:
Sidney Taffee: $78060.72 on floor 9
Susan Yaffee: $73000.60 on floor 7
https://ideone.com/GLNMZG
language:
C++ (gcc 8.3)
created:
4 years ago
visibility:
public

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