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a945c346 | 1 | // Copyright (C) 2020-2024 Free Software Foundation, Inc. |
cba9ef06 PP |
2 | // |
3 | // This file is part of the GNU ISO C++ Library. This library is free | |
4 | // software; you can redistribute it and/or modify it under the | |
5 | // terms of the GNU General Public License as published by the | |
6 | // Free Software Foundation; either version 3, or (at your option) | |
7 | // any later version. | |
8 | ||
9 | // This library is distributed in the hope that it will be useful, | |
10 | // but WITHOUT ANY WARRANTY; without even the implied warranty of | |
11 | // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
12 | // GNU General Public License for more details. | |
13 | ||
14 | // You should have received a copy of the GNU General Public License along | |
15 | // with this library; see the file COPYING3. If not see | |
16 | // <http://www.gnu.org/licenses/>. | |
17 | ||
d4ac20b0 | 18 | // { dg-do run { target c++20 } } |
cba9ef06 PP |
19 | |
20 | #include <algorithm> | |
237dde3d | 21 | #include <array> |
cba9ef06 | 22 | #include <ranges> |
7aa80c82 | 23 | #include <sstream> |
cba9ef06 PP |
24 | #include <string> |
25 | #include <string_view> | |
0d94c6df | 26 | #include <utility> |
cba9ef06 PP |
27 | #include <vector> |
28 | #include <testsuite_hooks.h> | |
29 | #include <testsuite_iterators.h> | |
30 | ||
31 | namespace ranges = std::ranges; | |
32 | namespace views = std::ranges::views; | |
33 | ||
34 | void | |
35 | test01() | |
36 | { | |
37 | using namespace std::literals; | |
38 | std::string_view cs[] = {"the", "quick", "brown", "fox"}; | |
39 | auto v = cs | views::join; | |
40 | VERIFY( ranges::equal(v, "thequickbrownfox"sv) ); | |
41 | using R = decltype(v); | |
42 | static_assert(ranges::bidirectional_range<R>); | |
43 | static_assert(ranges::bidirectional_range<const R>); | |
44 | static_assert(ranges::common_range<R>); | |
45 | static_assert(ranges::common_range<const R>); | |
46 | } | |
47 | ||
48 | void | |
49 | test02() | |
50 | { | |
51 | auto v = (views::iota(0,4) | |
52 | | views::transform([] (int i) { return views::iota(0,i); }) | |
53 | | views::join); | |
54 | VERIFY( ranges::equal(v, (int[]){0,0,1,0,1,2}) ); | |
55 | using R = decltype(v); | |
56 | static_assert(ranges::input_range<R>); | |
57 | static_assert(!ranges::range<const R>); | |
58 | static_assert(!ranges::forward_range<R>); | |
59 | static_assert(!ranges::common_range<const R>); | |
60 | } | |
61 | ||
62 | void | |
63 | test03() | |
64 | { | |
65 | auto v = (views::iota(0,4) | |
66 | | views::transform([] (int i) { return views::iota(0,i); }) | |
67 | | views::filter([] (auto) { return true; }) | |
68 | | views::join); | |
69 | VERIFY( ranges::equal(v, (int[]){0,0,1,0,1,2}) ); | |
70 | using R = decltype(v); | |
71 | static_assert(ranges::input_range<R>); | |
72 | static_assert(!ranges::range<const R>); | |
73 | static_assert(!ranges::forward_range<R>); | |
74 | static_assert(!ranges::common_range<const R>); | |
75 | } | |
76 | ||
77 | void | |
78 | test04() | |
79 | { | |
80 | auto v = (views::iota(0,4) | |
81 | | views::transform([] (int i) { return views::iota(0,i); })); | |
82 | auto v2 = ranges::ref_view{v}; | |
83 | VERIFY( ranges::equal(v2 | views::join, (int[]){0,0,1,0,1,2}) ); | |
84 | using R = decltype(v2); | |
85 | static_assert(ranges::random_access_range<R>); | |
86 | static_assert(ranges::range<const R>); | |
87 | static_assert(ranges::common_range<const R>); | |
88 | static_assert(ranges::random_access_range<ranges::range_reference_t<R>>); | |
89 | static_assert(!std::is_reference_v<ranges::range_reference_t<R>>); | |
90 | } | |
91 | ||
92 | void | |
93 | test05() | |
94 | { | |
95 | using namespace std::literals; | |
96 | std::vector<std::string> x = {"the", " ", "quick", " ", "brown", " ", "fox"}; | |
adbd2c71 | 97 | auto v = x | views::join | views::lazy_split(' '); |
cba9ef06 PP |
98 | auto i = v.begin(); |
99 | VERIFY( ranges::equal(*i++, "the"sv) ); | |
100 | VERIFY( ranges::equal(*i++, "quick"sv) ); | |
101 | VERIFY( ranges::equal(*i++, "brown"sv) ); | |
102 | VERIFY( ranges::equal(*i++, "fox"sv) ); | |
103 | VERIFY( i == v.end() ); | |
104 | } | |
105 | ||
6aa2ca21 PP |
106 | void |
107 | test06() | |
108 | { | |
109 | std::vector<std::string> x = {""}; | |
110 | auto i = std::counted_iterator(x.begin(), 1); | |
111 | auto r = ranges::subrange{i, std::default_sentinel}; | |
112 | auto v = r | views::transform(std::identity{}) | views::join; | |
113 | ||
114 | // Verify that _Iterator<false> is implicitly convertible to _Iterator<true>. | |
115 | static_assert(!std::same_as<decltype(ranges::begin(v)), | |
0d94c6df PP |
116 | decltype(std::as_const(v).begin())>); |
117 | auto a = std::as_const(v).begin(); | |
6aa2ca21 PP |
118 | a = ranges::begin(v); |
119 | ||
120 | // Verify that _Sentinel<false> is implicitly convertible to _Sentinel<true>. | |
121 | static_assert(!ranges::common_range<decltype(v)>); | |
122 | static_assert(!std::same_as<decltype(ranges::end(v)), | |
0d94c6df PP |
123 | decltype(std::as_const(v).end())>); |
124 | auto b = std::as_const(v).end(); | |
6aa2ca21 PP |
125 | b = ranges::end(v); |
126 | } | |
127 | ||
9065c4ad JW |
128 | void |
129 | test07() | |
130 | { | |
131 | // LWG 3474. Nesting join_views is broken because of CTAD | |
132 | std::vector<std::vector<std::vector<int>>> nested_vectors = { | |
133 | {{1, 2, 3}, {4, 5}, {6}}, | |
134 | {{7}, {8, 9}, {10, 11, 12}}, | |
135 | {{13}} | |
136 | }; | |
137 | auto joined = nested_vectors | std::views::join | std::views::join; | |
138 | ||
139 | using V = decltype(joined); | |
140 | static_assert( std::same_as<std::ranges::range_value_t<V>, int> ); | |
141 | } | |
142 | ||
d4a788c7 PP |
143 | void |
144 | test08() | |
145 | { | |
146 | // LWG 3500. join_view::iterator::operator->() is bogus | |
147 | struct X { int a; }; | |
148 | ranges::single_view<ranges::single_view<X>> s{std::in_place, std::in_place, 5}; | |
149 | auto v = s | views::join; | |
150 | auto i = v.begin(); | |
151 | VERIFY( i->a == 5 ); | |
152 | } | |
153 | ||
a25321ca PP |
154 | template<auto join = views::join> |
155 | void | |
156 | test09() | |
157 | { | |
158 | // Verify SFINAE behavior. | |
159 | static_assert(!requires { join(); }); | |
160 | static_assert(!requires { join(0, 0); }); | |
161 | static_assert(!requires { join(0); }); | |
162 | static_assert(!requires { 0 | join; }); | |
163 | } | |
164 | ||
85ef4b8d PP |
165 | void |
166 | test10() | |
167 | { | |
168 | // PR libstdc++/100290 | |
169 | auto v = views::single(0) | |
170 | | views::transform([](const auto& s) { return views::single(s); }) | |
171 | | views::join; | |
172 | VERIFY( ranges::next(v.begin()) == v.end() ); | |
173 | } | |
174 | ||
237dde3d PP |
175 | void |
176 | test11() | |
177 | { | |
178 | // Verify P2328 changes. | |
179 | int r[] = {1, 2, 3}; | |
180 | auto v = r | |
181 | | views::transform([] (int n) { return std::vector{{n, -n}}; }) | |
182 | | views::join; | |
183 | VERIFY( ranges::equal(v, (int[]){1, -1, 2, -2, 3, -3}) ); | |
184 | ||
185 | struct S { | |
186 | S() = default; | |
187 | S(const S&) = delete; | |
188 | S(S&&) = delete; | |
189 | }; | |
190 | auto w = r | |
191 | | views::transform([] (int) { return std::array<S, 2>{}; }) | |
192 | | views::join; | |
193 | for (auto& i : w) | |
194 | ; | |
195 | } | |
196 | ||
2c564e81 JW |
197 | void |
198 | test12() | |
199 | { | |
200 | // PR libstdc++/101263 | |
201 | constexpr auto b = [] { | |
202 | auto r = std::views::iota(0, 5) | |
203 | | std::views::lazy_split(0) | |
204 | | std::views::join; | |
205 | return r.begin() != r.end(); | |
206 | }(); | |
207 | } | |
208 | ||
db19cfda PP |
209 | void |
210 | test13() | |
211 | { | |
212 | // PR libstdc++/106320 | |
213 | auto l = std::views::transform([](auto x) { | |
214 | return x | std::views::transform([i=0](auto y) { | |
215 | return y; | |
216 | }); | |
217 | }); | |
218 | std::vector<std::vector<int>> v{{5, 6, 7}}; | |
219 | v | l | std::views::join; | |
220 | } | |
7aa80c82 PP |
221 | |
222 | void | |
223 | test14() | |
224 | { | |
225 | // LWG 3569: join_view fails to support ranges of ranges with | |
226 | // non-default_initializable iterators | |
227 | auto ss = std::istringstream{"1 2 3"}; | |
228 | auto v = views::single(views::istream<int>(ss)); | |
229 | using inner = ranges::range_reference_t<decltype(v)>; | |
230 | static_assert(ranges::input_range<inner> | |
231 | && !ranges::forward_range<inner> | |
232 | && !std::default_initializable<ranges::iterator_t<inner>>); | |
233 | VERIFY( ranges::equal(v | views::join, (int[]){1, 2, 3}) ); | |
234 | } | |
235 | ||
cba9ef06 PP |
236 | int |
237 | main() | |
238 | { | |
239 | test01(); | |
240 | test02(); | |
241 | test03(); | |
242 | test04(); | |
243 | test05(); | |
6aa2ca21 | 244 | test06(); |
9065c4ad | 245 | test07(); |
d4a788c7 | 246 | test08(); |
a25321ca | 247 | test09(); |
85ef4b8d | 248 | test10(); |
237dde3d | 249 | test11(); |
2c564e81 | 250 | test12(); |
db19cfda | 251 | test13(); |
7aa80c82 | 252 | test14(); |
cba9ef06 | 253 | } |