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1 //===----------------------------------------------------------------------===//
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2 //
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3 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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4 // See https://llvm.org/LICENSE.txt for license information.
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5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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6 //
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7 //===----------------------------------------------------------------------===//
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8
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9 #ifndef _LIBCPP___ALGORITHM_RANGES_SEARCH_H
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10 #define _LIBCPP___ALGORITHM_RANGES_SEARCH_H
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11
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12 #include <__algorithm/iterator_operations.h>
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13 #include <__algorithm/search.h>
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14 #include <__config>
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15 #include <__functional/identity.h>
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16 #include <__functional/ranges_operations.h>
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17 #include <__iterator/advance.h>
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18 #include <__iterator/concepts.h>
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19 #include <__iterator/distance.h>
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20 #include <__iterator/indirectly_comparable.h>
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21 #include <__ranges/access.h>
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22 #include <__ranges/concepts.h>
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23 #include <__ranges/size.h>
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24 #include <__ranges/subrange.h>
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25 #include <__utility/pair.h>
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26
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27 #if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
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28 # pragma GCC system_header
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29 #endif
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30
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31 #if _LIBCPP_STD_VER > 17
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32
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33 _LIBCPP_BEGIN_NAMESPACE_STD
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34
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35 namespace ranges {
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36 namespace __search {
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37 struct __fn {
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38 template <class _Iter1, class _Sent1, class _Iter2, class _Sent2, class _Pred, class _Proj1, class _Proj2>
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39 _LIBCPP_HIDE_FROM_ABI static constexpr subrange<_Iter1> __ranges_search_impl(
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40 _Iter1 __first1,
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41 _Sent1 __last1,
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42 _Iter2 __first2,
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43 _Sent2 __last2,
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44 _Pred& __pred,
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45 _Proj1& __proj1,
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46 _Proj2& __proj2) {
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47 if constexpr (sized_sentinel_for<_Sent2, _Iter2>) {
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48 auto __size2 = ranges::distance(__first2, __last2);
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49 if (__size2 == 0)
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50 return {__first1, __first1};
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51
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52 if constexpr (sized_sentinel_for<_Sent1, _Iter1>) {
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53 auto __size1 = ranges::distance(__first1, __last1);
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54 if (__size1 < __size2) {
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55 ranges::advance(__first1, __last1);
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56 return {__first1, __first1};
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57 }
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58
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59 if constexpr (random_access_iterator<_Iter1> && random_access_iterator<_Iter2>) {
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60 auto __ret = std::__search_random_access_impl<_RangeAlgPolicy>(
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61 __first1, __last1, __first2, __last2, __pred, __proj1, __proj2, __size1, __size2);
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62 return {__ret.first, __ret.second};
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63 }
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64 }
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65 }
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66
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67 auto __ret =
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68 std::__search_forward_impl<_RangeAlgPolicy>(__first1, __last1, __first2, __last2, __pred, __proj1, __proj2);
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69 return {__ret.first, __ret.second};
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70 }
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71
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72 template <forward_iterator _Iter1, sentinel_for<_Iter1> _Sent1,
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73 forward_iterator _Iter2, sentinel_for<_Iter2> _Sent2,
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74 class _Pred = ranges::equal_to,
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75 class _Proj1 = identity,
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76 class _Proj2 = identity>
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77 requires indirectly_comparable<_Iter1, _Iter2, _Pred, _Proj1, _Proj2>
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78 _LIBCPP_HIDE_FROM_ABI constexpr
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79 subrange<_Iter1> operator()(_Iter1 __first1, _Sent1 __last1,
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80 _Iter2 __first2, _Sent2 __last2,
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81 _Pred __pred = {},
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82 _Proj1 __proj1 = {},
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83 _Proj2 __proj2 = {}) const {
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84 return __ranges_search_impl(__first1, __last1, __first2, __last2, __pred, __proj1, __proj2);
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85 }
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86
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87 template <forward_range _Range1,
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88 forward_range _Range2,
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89 class _Pred = ranges::equal_to,
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90 class _Proj1 = identity,
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91 class _Proj2 = identity>
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92 requires indirectly_comparable<iterator_t<_Range1>, iterator_t<_Range2>, _Pred, _Proj1, _Proj2>
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93 _LIBCPP_HIDE_FROM_ABI constexpr
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94 borrowed_subrange_t<_Range1> operator()(_Range1&& __range1,
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95 _Range2&& __range2,
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96 _Pred __pred = {},
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97 _Proj1 __proj1 = {},
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98 _Proj2 __proj2 = {}) const {
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99 auto __first1 = ranges::begin(__range1);
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100 if constexpr (sized_range<_Range2>) {
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101 auto __size2 = ranges::size(__range2);
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102 if (__size2 == 0)
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103 return {__first1, __first1};
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104 if constexpr (sized_range<_Range1>) {
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105 auto __size1 = ranges::size(__range1);
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106 if (__size1 < __size2) {
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107 ranges::advance(__first1, ranges::end(__range1));
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108 return {__first1, __first1};
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109 }
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110 }
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111 }
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112
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113 return __ranges_search_impl(
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114 ranges::begin(__range1),
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115 ranges::end(__range1),
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116 ranges::begin(__range2),
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117 ranges::end(__range2),
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118 __pred,
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119 __proj1,
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120 __proj2);
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121 }
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122
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123 };
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124 } // namespace __search
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125
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126 inline namespace __cpo {
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127 inline constexpr auto search = __search::__fn{};
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128 } // namespace __cpo
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129 } // namespace ranges
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130
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131 _LIBCPP_END_NAMESPACE_STD
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132
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133 #endif // _LIBCPP_STD_VER > 17
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134
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135 #endif // _LIBCPP___ALGORITHM_RANGES_SEARCH_H
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