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99dee823 | 1 | // Copyright (C) 2020-2021 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 | ||
18 | // { dg-options "-std=gnu++2a" } | |
19 | // { dg-do run { target c++2a } } | |
20 | ||
21 | #include <algorithm> | |
22 | #include <ranges> | |
23 | #include <string> | |
24 | #include <string_view> | |
25 | #include <vector> | |
26 | #include <testsuite_hooks.h> | |
27 | #include <testsuite_iterators.h> | |
28 | ||
29 | namespace ranges = std::ranges; | |
30 | namespace views = std::ranges::views; | |
31 | ||
32 | void | |
33 | test01() | |
34 | { | |
35 | using namespace std::literals; | |
36 | std::string_view cs[] = {"the", "quick", "brown", "fox"}; | |
37 | auto v = cs | views::join; | |
38 | VERIFY( ranges::equal(v, "thequickbrownfox"sv) ); | |
39 | using R = decltype(v); | |
40 | static_assert(ranges::bidirectional_range<R>); | |
41 | static_assert(ranges::bidirectional_range<const R>); | |
42 | static_assert(ranges::common_range<R>); | |
43 | static_assert(ranges::common_range<const R>); | |
44 | } | |
45 | ||
46 | void | |
47 | test02() | |
48 | { | |
49 | auto v = (views::iota(0,4) | |
50 | | views::transform([] (int i) { return views::iota(0,i); }) | |
51 | | views::join); | |
52 | VERIFY( ranges::equal(v, (int[]){0,0,1,0,1,2}) ); | |
53 | using R = decltype(v); | |
54 | static_assert(ranges::input_range<R>); | |
55 | static_assert(!ranges::range<const R>); | |
56 | static_assert(!ranges::forward_range<R>); | |
57 | static_assert(!ranges::common_range<const R>); | |
58 | } | |
59 | ||
60 | void | |
61 | test03() | |
62 | { | |
63 | auto v = (views::iota(0,4) | |
64 | | views::transform([] (int i) { return views::iota(0,i); }) | |
65 | | views::filter([] (auto) { return true; }) | |
66 | | views::join); | |
67 | VERIFY( ranges::equal(v, (int[]){0,0,1,0,1,2}) ); | |
68 | using R = decltype(v); | |
69 | static_assert(ranges::input_range<R>); | |
70 | static_assert(!ranges::range<const R>); | |
71 | static_assert(!ranges::forward_range<R>); | |
72 | static_assert(!ranges::common_range<const R>); | |
73 | } | |
74 | ||
75 | void | |
76 | test04() | |
77 | { | |
78 | auto v = (views::iota(0,4) | |
79 | | views::transform([] (int i) { return views::iota(0,i); })); | |
80 | auto v2 = ranges::ref_view{v}; | |
81 | VERIFY( ranges::equal(v2 | views::join, (int[]){0,0,1,0,1,2}) ); | |
82 | using R = decltype(v2); | |
83 | static_assert(ranges::random_access_range<R>); | |
84 | static_assert(ranges::range<const R>); | |
85 | static_assert(ranges::common_range<const R>); | |
86 | static_assert(ranges::random_access_range<ranges::range_reference_t<R>>); | |
87 | static_assert(!std::is_reference_v<ranges::range_reference_t<R>>); | |
88 | } | |
89 | ||
90 | void | |
91 | test05() | |
92 | { | |
93 | using namespace std::literals; | |
94 | std::vector<std::string> x = {"the", " ", "quick", " ", "brown", " ", "fox"}; | |
95 | auto v = x | views::join | views::split(' '); | |
96 | auto i = v.begin(); | |
97 | VERIFY( ranges::equal(*i++, "the"sv) ); | |
98 | VERIFY( ranges::equal(*i++, "quick"sv) ); | |
99 | VERIFY( ranges::equal(*i++, "brown"sv) ); | |
100 | VERIFY( ranges::equal(*i++, "fox"sv) ); | |
101 | VERIFY( i == v.end() ); | |
102 | } | |
103 | ||
6aa2ca21 PP |
104 | void |
105 | test06() | |
106 | { | |
107 | std::vector<std::string> x = {""}; | |
108 | auto i = std::counted_iterator(x.begin(), 1); | |
109 | auto r = ranges::subrange{i, std::default_sentinel}; | |
110 | auto v = r | views::transform(std::identity{}) | views::join; | |
111 | ||
112 | // Verify that _Iterator<false> is implicitly convertible to _Iterator<true>. | |
113 | static_assert(!std::same_as<decltype(ranges::begin(v)), | |
114 | decltype(ranges::cbegin(v))>); | |
115 | auto a = ranges::cbegin(v); | |
116 | a = ranges::begin(v); | |
117 | ||
118 | // Verify that _Sentinel<false> is implicitly convertible to _Sentinel<true>. | |
119 | static_assert(!ranges::common_range<decltype(v)>); | |
120 | static_assert(!std::same_as<decltype(ranges::end(v)), | |
121 | decltype(ranges::cend(v))>); | |
122 | auto b = ranges::cend(v); | |
123 | b = ranges::end(v); | |
124 | } | |
125 | ||
9065c4ad JW |
126 | void |
127 | test07() | |
128 | { | |
129 | // LWG 3474. Nesting join_views is broken because of CTAD | |
130 | std::vector<std::vector<std::vector<int>>> nested_vectors = { | |
131 | {{1, 2, 3}, {4, 5}, {6}}, | |
132 | {{7}, {8, 9}, {10, 11, 12}}, | |
133 | {{13}} | |
134 | }; | |
135 | auto joined = nested_vectors | std::views::join | std::views::join; | |
136 | ||
137 | using V = decltype(joined); | |
138 | static_assert( std::same_as<std::ranges::range_value_t<V>, int> ); | |
139 | } | |
140 | ||
d4a788c7 PP |
141 | void |
142 | test08() | |
143 | { | |
144 | // LWG 3500. join_view::iterator::operator->() is bogus | |
145 | struct X { int a; }; | |
146 | ranges::single_view<ranges::single_view<X>> s{std::in_place, std::in_place, 5}; | |
147 | auto v = s | views::join; | |
148 | auto i = v.begin(); | |
149 | VERIFY( i->a == 5 ); | |
150 | } | |
151 | ||
a25321ca PP |
152 | template<auto join = views::join> |
153 | void | |
154 | test09() | |
155 | { | |
156 | // Verify SFINAE behavior. | |
157 | static_assert(!requires { join(); }); | |
158 | static_assert(!requires { join(0, 0); }); | |
159 | static_assert(!requires { join(0); }); | |
160 | static_assert(!requires { 0 | join; }); | |
161 | } | |
162 | ||
85ef4b8d PP |
163 | void |
164 | test10() | |
165 | { | |
166 | // PR libstdc++/100290 | |
167 | auto v = views::single(0) | |
168 | | views::transform([](const auto& s) { return views::single(s); }) | |
169 | | views::join; | |
170 | VERIFY( ranges::next(v.begin()) == v.end() ); | |
171 | } | |
172 | ||
cba9ef06 PP |
173 | int |
174 | main() | |
175 | { | |
176 | test01(); | |
177 | test02(); | |
178 | test03(); | |
179 | test04(); | |
180 | test05(); | |
6aa2ca21 | 181 | test06(); |
9065c4ad | 182 | test07(); |
d4a788c7 | 183 | test08(); |
a25321ca | 184 | test09(); |
85ef4b8d | 185 | test10(); |
cba9ef06 | 186 | } |