1//===----------------------------------------------------------------------===//
2//
3// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
4// See https://llvm.org/LICENSE.txt for license information.
5// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
6//
7//===----------------------------------------------------------------------===//
8
9// UNSUPPORTED: c++03, c++11, c++14, c++17
10
11// std::views::counted;
12
13#include <ranges>
14#include <cassert>
15#include <concepts>
16#include <cstddef>
17#include <memory>
18#include <span>
19#include <utility>
20
21#include "test_macros.h"
22#include "test_iterators.h"
23
24struct RvalueConvertible {
25 RvalueConvertible(const RvalueConvertible&) = delete;
26 operator int() &&;
27};
28
29struct LvalueConvertible {
30 LvalueConvertible(const LvalueConvertible&) = delete;
31 operator int() &;
32};
33
34struct OnlyExplicitlyConvertible {
35 explicit operator int() const;
36};
37
38template<class... Ts>
39concept CountedInvocable = requires (Ts&&... ts) {
40 std::views::counted(std::forward<Ts>(ts)...);
41};
42
43constexpr bool test() {
44 int buffer[8] = {1, 2, 3, 4, 5, 6, 7, 8};
45
46 {
47 static_assert(std::addressof(std::views::counted) == std::addressof(std::ranges::views::counted));
48
49 static_assert( CountedInvocable<int*, std::size_t>);
50 static_assert(!CountedInvocable<int*, LvalueConvertible>);
51 static_assert( CountedInvocable<int*, LvalueConvertible&>);
52 static_assert( CountedInvocable<int*, RvalueConvertible>);
53 static_assert(!CountedInvocable<int*, RvalueConvertible&>);
54 static_assert(!CountedInvocable<int*, OnlyExplicitlyConvertible>);
55 static_assert(!CountedInvocable<int*, int*>);
56 static_assert(!CountedInvocable<int*>);
57 static_assert(!CountedInvocable<std::size_t>);
58 static_assert(!CountedInvocable<>);
59 }
60
61 {
62 auto c1 = std::views::counted(buffer, 3);
63 auto c2 = std::views::counted(std::as_const(buffer), 3);
64
65 ASSERT_SAME_TYPE(decltype(c1), std::span<int>);
66 ASSERT_SAME_TYPE(decltype(c2), std::span<const int>);
67
68 assert(c1.data() == buffer && c1.size() == 3);
69 assert(c2.data() == buffer && c2.size() == 3);
70 }
71
72 {
73 auto it = contiguous_iterator<int*>(buffer);
74 auto cit = contiguous_iterator<const int*>(buffer);
75
76 auto c1 = std::views::counted(it, 3);
77 auto c2 = std::views::counted(std::as_const(it), 3);
78 auto c3 = std::views::counted(std::move(it), 3);
79 auto c4 = std::views::counted(contiguous_iterator<int*>(buffer), 3);
80 auto c5 = std::views::counted(cit, 3);
81 auto c6 = std::views::counted(std::as_const(cit), 3);
82 auto c7 = std::views::counted(std::move(cit), 3);
83 auto c8 = std::views::counted(contiguous_iterator<const int*>(buffer), 3);
84
85 ASSERT_SAME_TYPE(decltype(c1), std::span<int>);
86 ASSERT_SAME_TYPE(decltype(c2), std::span<int>);
87 ASSERT_SAME_TYPE(decltype(c3), std::span<int>);
88 ASSERT_SAME_TYPE(decltype(c4), std::span<int>);
89 ASSERT_SAME_TYPE(decltype(c5), std::span<const int>);
90 ASSERT_SAME_TYPE(decltype(c6), std::span<const int>);
91 ASSERT_SAME_TYPE(decltype(c7), std::span<const int>);
92 ASSERT_SAME_TYPE(decltype(c8), std::span<const int>);
93
94 assert(c1.data() == buffer && c1.size() == 3);
95 assert(c2.data() == buffer && c2.size() == 3);
96 assert(c3.data() == buffer && c3.size() == 3);
97 assert(c4.data() == buffer && c4.size() == 3);
98 assert(c5.data() == buffer && c5.size() == 3);
99 assert(c6.data() == buffer && c6.size() == 3);
100 assert(c7.data() == buffer && c7.size() == 3);
101 assert(c8.data() == buffer && c8.size() == 3);
102 }
103
104 {
105 auto it = random_access_iterator<int*>(buffer);
106 auto cit = random_access_iterator<const int*>(buffer);
107
108 auto c1 = std::views::counted(it, 3);
109 auto c2 = std::views::counted(std::as_const(it), 3);
110 auto c3 = std::views::counted(std::move(it), 3);
111 auto c4 = std::views::counted(random_access_iterator<int*>(buffer), 3);
112 auto c5 = std::views::counted(cit, 3);
113 auto c6 = std::views::counted(std::as_const(cit), 3);
114 auto c7 = std::views::counted(std::move(cit), 3);
115 auto c8 = std::views::counted(random_access_iterator<const int*>(buffer), 3);
116
117 ASSERT_SAME_TYPE(decltype(c1), std::ranges::subrange<random_access_iterator<int*>>);
118 ASSERT_SAME_TYPE(decltype(c2), std::ranges::subrange<random_access_iterator<int*>>);
119 ASSERT_SAME_TYPE(decltype(c3), std::ranges::subrange<random_access_iterator<int*>>);
120 ASSERT_SAME_TYPE(decltype(c4), std::ranges::subrange<random_access_iterator<int*>>);
121 ASSERT_SAME_TYPE(decltype(c5), std::ranges::subrange<random_access_iterator<const int*>>);
122 ASSERT_SAME_TYPE(decltype(c6), std::ranges::subrange<random_access_iterator<const int*>>);
123 ASSERT_SAME_TYPE(decltype(c7), std::ranges::subrange<random_access_iterator<const int*>>);
124 ASSERT_SAME_TYPE(decltype(c8), std::ranges::subrange<random_access_iterator<const int*>>);
125
126 assert(c1.begin() == it && c1.end() == it + 3);
127 assert(c2.begin() == it && c2.end() == it + 3);
128 assert(c3.begin() == it && c3.end() == it + 3);
129 assert(c4.begin() == it && c4.end() == it + 3);
130 assert(c5.begin() == cit && c5.end() == cit + 3);
131 assert(c6.begin() == cit && c6.end() == cit + 3);
132 assert(c7.begin() == cit && c7.end() == cit + 3);
133 assert(c8.begin() == cit && c8.end() == cit + 3);
134 }
135
136 {
137 auto it = bidirectional_iterator<int*>(buffer);
138 auto cit = bidirectional_iterator<const int*>(buffer);
139
140 auto c1 = std::views::counted(it, 3);
141 auto c2 = std::views::counted(std::as_const(it), 3);
142 auto c3 = std::views::counted(std::move(it), 3);
143 auto c4 = std::views::counted(bidirectional_iterator<int*>(buffer), 3);
144 auto c5 = std::views::counted(cit, 3);
145 auto c6 = std::views::counted(std::as_const(cit), 3);
146 auto c7 = std::views::counted(std::move(cit), 3);
147 auto c8 = std::views::counted(bidirectional_iterator<const int*>(buffer), 3);
148
149 using Expected = std::ranges::subrange<std::counted_iterator<decltype(it)>, std::default_sentinel_t>;
150 using ConstExpected = std::ranges::subrange<std::counted_iterator<decltype(cit)>, std::default_sentinel_t>;
151
152 ASSERT_SAME_TYPE(decltype(c1), Expected);
153 ASSERT_SAME_TYPE(decltype(c2), Expected);
154 ASSERT_SAME_TYPE(decltype(c3), Expected);
155 ASSERT_SAME_TYPE(decltype(c4), Expected);
156 ASSERT_SAME_TYPE(decltype(c5), ConstExpected);
157 ASSERT_SAME_TYPE(decltype(c6), ConstExpected);
158 ASSERT_SAME_TYPE(decltype(c7), ConstExpected);
159 ASSERT_SAME_TYPE(decltype(c8), ConstExpected);
160
161 assert(c1.begin().base() == it && c1.size() == 3);
162 assert(c2.begin().base() == it && c2.size() == 3);
163 assert(c3.begin().base() == it && c3.size() == 3);
164 assert(c4.begin().base() == it && c4.size() == 3);
165 assert(c5.begin().base() == cit && c5.size() == 3);
166 assert(c6.begin().base() == cit && c6.size() == 3);
167 assert(c7.begin().base() == cit && c7.size() == 3);
168 assert(c8.begin().base() == cit && c8.size() == 3);
169 }
170
171 {
172 auto it = cpp17_output_iterator<int*>(buffer);
173
174 auto c1 = std::views::counted(it, 3);
175 auto c2 = std::views::counted(std::as_const(it), 3);
176 auto c3 = std::views::counted(std::move(it), 3);
177 auto c4 = std::views::counted(cpp17_output_iterator<int*>(buffer), 3);
178
179 using Expected = std::ranges::subrange<std::counted_iterator<decltype(it)>, std::default_sentinel_t>;
180
181 ASSERT_SAME_TYPE(decltype(c1), Expected);
182 ASSERT_SAME_TYPE(decltype(c2), Expected);
183 ASSERT_SAME_TYPE(decltype(c3), Expected);
184 ASSERT_SAME_TYPE(decltype(c4), Expected);
185
186 assert(base(c1.begin().base()) == buffer && c1.size() == 3);
187 assert(base(c2.begin().base()) == buffer && c2.size() == 3);
188 assert(base(c3.begin().base()) == buffer && c3.size() == 3);
189 assert(base(c4.begin().base()) == buffer && c4.size() == 3);
190 }
191
192 {
193 auto it = cpp17_input_iterator<int*>(buffer);
194
195 auto c1 = std::views::counted(it, 3);
196 auto c2 = std::views::counted(std::as_const(it), 3);
197 auto c3 = std::views::counted(std::move(it), 3);
198 auto c4 = std::views::counted(cpp17_input_iterator<int*>(buffer), 3);
199
200 using Expected = std::ranges::subrange<std::counted_iterator<decltype(it)>, std::default_sentinel_t>;
201
202 ASSERT_SAME_TYPE(decltype(c1), Expected);
203 ASSERT_SAME_TYPE(decltype(c2), Expected);
204 ASSERT_SAME_TYPE(decltype(c3), Expected);
205 ASSERT_SAME_TYPE(decltype(c4), Expected);
206
207 assert(base(c1.begin().base()) == buffer && c1.size() == 3);
208 assert(base(c2.begin().base()) == buffer && c2.size() == 3);
209 assert(base(c3.begin().base()) == buffer && c3.size() == 3);
210 assert(base(c4.begin().base()) == buffer && c4.size() == 3);
211 }
212
213 {
214 auto it = cpp20_input_iterator<int*>(buffer);
215
216 static_assert(!std::copyable<cpp20_input_iterator<int*>>);
217 static_assert(!CountedInvocable<cpp20_input_iterator<int*>&, int>);
218 static_assert(!CountedInvocable<const cpp20_input_iterator<int*>&, int>);
219 auto c3 = std::views::counted(std::move(it), 3);
220 auto c4 = std::views::counted(cpp20_input_iterator<int*>(buffer), 3);
221
222 using Expected = std::ranges::subrange<std::counted_iterator<decltype(it)>, std::default_sentinel_t>;
223
224 ASSERT_SAME_TYPE(decltype(c3), Expected);
225 ASSERT_SAME_TYPE(decltype(c4), Expected);
226
227 assert(base(c3.begin().base()) == buffer && c3.size() == 3);
228 assert(base(c4.begin().base()) == buffer && c4.size() == 3);
229 }
230
231 return true;
232}
233
234int main(int, char**) {
235 test();
236 static_assert(test());
237
238 return 0;
239}
240

source code of libcxx/test/std/ranges/range.adaptors/range.counted/counted.pass.cpp