rotate_copy.pass.cpp 4.9 KB

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  1. //===----------------------------------------------------------------------===//
  2. //
  3. // The LLVM Compiler Infrastructure
  4. //
  5. // This file is dual licensed under the MIT and the University of Illinois Open
  6. // Source Licenses. See LICENSE.TXT for details.
  7. //
  8. //===----------------------------------------------------------------------===//
  9. // <algorithm>
  10. // template<ForwardIterator InIter, OutputIterator<auto, InIter::reference> OutIter>
  11. // constexpr OutIter // constexpr after C++17
  12. // rotate_copy(InIter first, InIter middle, InIter last, OutIter result);
  13. #include <algorithm>
  14. #include <cassert>
  15. #include "test_macros.h"
  16. #include "test_iterators.h"
  17. // #if TEST_STD_VER > 17
  18. // TEST_CONSTEXPR bool test_constexpr() {
  19. // int ia[] = {1, 3, 5, 2, 5, 6};
  20. // int ib[std::size(ia)] = {0};
  21. //
  22. // const size_t N = 2;
  23. // const auto middle = std::begin(ia) + N;
  24. // auto it = std::rotate_copy(std::begin(ia), middle, std::end(ia), std::begin(ib));
  25. //
  26. // return std::distance(std::begin(ib), it) == std::size(ia)
  27. // && std::equal (std::begin(ia), middle, std::begin(ib) + std::size(ia) - N)
  28. // && std::equal (middle, std::end(ia), std::begin(ib))
  29. // ;
  30. // }
  31. // #endif
  32. template <class InIter, class OutIter>
  33. void
  34. test()
  35. {
  36. int ia[] = {0, 1, 2, 3};
  37. const unsigned sa = sizeof(ia)/sizeof(ia[0]);
  38. int ib[sa] = {0};
  39. OutIter r = std::rotate_copy(InIter(ia), InIter(ia), InIter(ia), OutIter(ib));
  40. assert(base(r) == ib);
  41. r = std::rotate_copy(InIter(ia), InIter(ia), InIter(ia+1), OutIter(ib));
  42. assert(base(r) == ib+1);
  43. assert(ib[0] == 0);
  44. r = std::rotate_copy(InIter(ia), InIter(ia+1), InIter(ia+1), OutIter(ib));
  45. assert(base(r) == ib+1);
  46. assert(ib[0] == 0);
  47. r = std::rotate_copy(InIter(ia), InIter(ia), InIter(ia+2), OutIter(ib));
  48. assert(base(r) == ib+2);
  49. assert(ib[0] == 0);
  50. assert(ib[1] == 1);
  51. r = std::rotate_copy(InIter(ia), InIter(ia+1), InIter(ia+2), OutIter(ib));
  52. assert(base(r) == ib+2);
  53. assert(ib[0] == 1);
  54. assert(ib[1] == 0);
  55. r = std::rotate_copy(InIter(ia), InIter(ia+2), InIter(ia+2), OutIter(ib));
  56. assert(base(r) == ib+2);
  57. assert(ib[0] == 0);
  58. assert(ib[1] == 1);
  59. r = std::rotate_copy(InIter(ia), InIter(ia), InIter(ia+3), OutIter(ib));
  60. assert(base(r) == ib+3);
  61. assert(ib[0] == 0);
  62. assert(ib[1] == 1);
  63. assert(ib[2] == 2);
  64. r = std::rotate_copy(InIter(ia), InIter(ia+1), InIter(ia+3), OutIter(ib));
  65. assert(base(r) == ib+3);
  66. assert(ib[0] == 1);
  67. assert(ib[1] == 2);
  68. assert(ib[2] == 0);
  69. r = std::rotate_copy(InIter(ia), InIter(ia+2), InIter(ia+3), OutIter(ib));
  70. assert(base(r) == ib+3);
  71. assert(ib[0] == 2);
  72. assert(ib[1] == 0);
  73. assert(ib[2] == 1);
  74. r = std::rotate_copy(InIter(ia), InIter(ia+3), InIter(ia+3), OutIter(ib));
  75. assert(base(r) == ib+3);
  76. assert(ib[0] == 0);
  77. assert(ib[1] == 1);
  78. assert(ib[2] == 2);
  79. r = std::rotate_copy(InIter(ia), InIter(ia), InIter(ia+4), OutIter(ib));
  80. assert(base(r) == ib+4);
  81. assert(ib[0] == 0);
  82. assert(ib[1] == 1);
  83. assert(ib[2] == 2);
  84. assert(ib[3] == 3);
  85. r = std::rotate_copy(InIter(ia), InIter(ia+1), InIter(ia+4), OutIter(ib));
  86. assert(base(r) == ib+4);
  87. assert(ib[0] == 1);
  88. assert(ib[1] == 2);
  89. assert(ib[2] == 3);
  90. assert(ib[3] == 0);
  91. r = std::rotate_copy(InIter(ia), InIter(ia+2), InIter(ia+4), OutIter(ib));
  92. assert(base(r) == ib+4);
  93. assert(ib[0] == 2);
  94. assert(ib[1] == 3);
  95. assert(ib[2] == 0);
  96. assert(ib[3] == 1);
  97. r = std::rotate_copy(InIter(ia), InIter(ia+3), InIter(ia+4), OutIter(ib));
  98. assert(base(r) == ib+4);
  99. assert(ib[0] == 3);
  100. assert(ib[1] == 0);
  101. assert(ib[2] == 1);
  102. assert(ib[3] == 2);
  103. r = std::rotate_copy(InIter(ia), InIter(ia+4), InIter(ia+4), OutIter(ib));
  104. assert(base(r) == ib+4);
  105. assert(ib[0] == 0);
  106. assert(ib[1] == 1);
  107. assert(ib[2] == 2);
  108. assert(ib[3] == 3);
  109. }
  110. int main()
  111. {
  112. test<bidirectional_iterator<const int*>, output_iterator<int*> >();
  113. test<bidirectional_iterator<const int*>, forward_iterator<int*> >();
  114. test<bidirectional_iterator<const int*>, bidirectional_iterator<int*> >();
  115. test<bidirectional_iterator<const int*>, random_access_iterator<int*> >();
  116. test<bidirectional_iterator<const int*>, int*>();
  117. test<random_access_iterator<const int*>, output_iterator<int*> >();
  118. test<random_access_iterator<const int*>, forward_iterator<int*> >();
  119. test<random_access_iterator<const int*>, bidirectional_iterator<int*> >();
  120. test<random_access_iterator<const int*>, random_access_iterator<int*> >();
  121. test<random_access_iterator<const int*>, int*>();
  122. test<const int*, output_iterator<int*> >();
  123. test<const int*, forward_iterator<int*> >();
  124. test<const int*, bidirectional_iterator<int*> >();
  125. test<const int*, random_access_iterator<int*> >();
  126. test<const int*, int*>();
  127. // #if TEST_STD_VER > 17
  128. // static_assert(test_constexpr());
  129. // #endif
  130. }