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  1. #include <iostream>
  2. #include <vector>
  3. #include <functional>
  4. #include <cinttypes>
  5.  
  6. using namespace std;
  7.  
  8. template<class T, uint8_t B>
  9. struct Hui {
  10.     static void sort3_impl(vector<T> & arr);
  11. };
  12.  
  13. template<class T>
  14. struct Hui<T, 0> {
  15.     static void sort3_impl(vector<T> &)
  16.     {
  17.     }
  18. };
  19.  
  20. template<class T>
  21. struct Hui<T, 1> {
  22.     static void sort3_impl(vector<T> & arr)
  23.     {
  24.         swap(arr[0], arr[1]);
  25.     }
  26. };
  27.  
  28. template<class T>
  29. struct Hui<T, 2> {
  30.     static void sort3_impl(vector<T> & arr)
  31.     {
  32.         swap(arr[1], arr[2]);
  33.     }
  34. };
  35.  
  36. template<class T>
  37. struct Hui<T, 5> {
  38.     static void sort3_impl(vector<T> & arr)
  39.     {
  40.         swap(arr[0], arr[1]);
  41.         swap(arr[1], arr[2]);
  42.     }
  43. };
  44.  
  45. template<class T>
  46. struct Hui<T, 6> {
  47.     static void sort3_impl(vector<T> & arr)
  48.     {
  49.         swap(arr[0], arr[2]);
  50.         swap(arr[1], arr[2]);
  51.     }
  52. };
  53.  
  54. template<class T>
  55. struct Hui<T, 7> {
  56.     static void sort3_impl(vector<T> & arr)
  57.     {
  58.         swap(arr[0], arr[2]);
  59.     }
  60. };
  61.  
  62. template<class T>
  63. void sort3_runtime_call(vector<T> & arr, uint8_t bits)
  64. {
  65.     static array<function<void(vector<T> &)>, 8> func_table = {
  66.         Hui<T, 0>::sort3_impl,
  67.         Hui<T, 1>::sort3_impl,
  68.         Hui<T, 2>::sort3_impl,
  69.         Hui<T, 0>::sort3_impl,
  70.         Hui<T, 0>::sort3_impl,
  71.         Hui<T, 5>::sort3_impl,
  72.         Hui<T, 6>::sort3_impl,
  73.         Hui<T, 7>::sort3_impl,
  74.     };
  75.     func_table[bits](arr);
  76. }
  77.  
  78. template<class T>
  79. void sort3(vector<T> & arr)
  80. {
  81.     sort3_runtime_call(arr, (arr[0] > arr[1]) | ((arr[1] > arr[2]) << 1) | ((arr[0] > arr[2]) << 2));
  82. }
  83.  
  84. int main()
  85. {
  86.     vector<vector<uint32_t>> tests = {
  87.         {1, 2, 3}, {1, 3, 2}, {2, 1, 3},
  88.         {2, 3, 1}, {3, 1, 2}, {3, 2, 1},
  89.     };
  90.  
  91.     for (auto && arr : tests) {
  92.         sort3(arr);
  93.         cout << arr[0] << ", " << arr[1] << ", " << arr[2] << endl;
  94.     }
  95.     return EXIT_SUCCESS;
  96. }
Success #stdin #stdout 0s 15240KB
comments (?)
stdin 
Standard input is empty
stdout 
1, 2, 3
1, 2, 3
1, 2, 3
1, 2, 3
1, 2, 3
1, 2, 3
https://ideone.com/1RvRS7
language:
C++14 (clang 8.0)
created:
7 years ago
visibility:
public

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