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83ffe9cd | 1 | // Copyright (C) 2020-2023 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> | |
ac73c944 JW |
23 | #include <tuple> |
24 | #include <vector> | |
cba9ef06 PP |
25 | #include <testsuite_hooks.h> |
26 | #include <testsuite_iterators.h> | |
cba9ef06 PP |
27 | |
28 | namespace ranges = std::ranges; | |
29 | namespace views = ranges::views; | |
30 | ||
31 | void | |
32 | test01() | |
33 | { | |
34 | std::tuple<int, int> x[] = {{1,2},{3,4},{5,6}}; | |
35 | auto v0 = x | views::elements<0>; | |
36 | VERIFY( ranges::equal(v0, (int[]){1,3,5}) ); | |
37 | VERIFY( ranges::equal(v0, x | views::keys) ); | |
38 | VERIFY( ranges::size(v0) == 3 ); | |
39 | ||
40 | using R0 = decltype(v0); | |
41 | static_assert(ranges::random_access_range<R0>); | |
42 | static_assert(ranges::sized_range<R0>); | |
43 | ||
44 | auto v1 = x | views::reverse | views::elements<1> | views::reverse; | |
45 | VERIFY( ranges::equal(v1, (int[]){2,4,6}) ); | |
46 | VERIFY( ranges::equal(v1, x | views::values) ); | |
47 | } | |
48 | ||
4be16d1c PP |
49 | struct S |
50 | { | |
51 | friend bool | |
52 | operator==(std::input_iterator auto const& i, S) | |
53 | { return std::get<1>(*i) == 0; } | |
54 | }; | |
55 | ||
56 | void | |
57 | test02() | |
58 | { | |
59 | // This verifies that P1994R1 (and LWG3406) is implemented. | |
60 | std::pair<std::pair<char, int>, long> x[] | |
61 | = {{{1,2},3l}, {{1,0},2l}, {{1,2},0l}}; | |
62 | ranges::subrange r{ranges::begin(x), S{}}; | |
63 | ||
64 | auto v = r | views::keys; | |
65 | VERIFY( ranges::equal(v, (std::pair<char, int>[]){{1,2},{1,0}}) ); | |
66 | ranges::subrange v2{ranges::begin(v), S{}}; | |
67 | VERIFY( ranges::equal(v2, (std::pair<char, int>[]){{1,2}}) ); | |
68 | } | |
69 | ||
2ec58cfc JW |
70 | struct X |
71 | { | |
72 | using Iter = __gnu_test::forward_iterator_wrapper<std::pair<int, X>>; | |
73 | ||
74 | friend auto operator-(Iter l, Iter r) { return l.ptr - r.ptr; } | |
75 | }; | |
76 | ||
77 | void | |
78 | test03() | |
79 | { | |
a49a045b JW |
80 | using ranges::next; |
81 | using ranges::begin; | |
82 | ||
2ec58cfc JW |
83 | // LWG 3483 |
84 | std::pair<int, X> x[3]; | |
85 | __gnu_test::test_forward_range<std::pair<int, X>> r(x); | |
86 | auto v = views::elements<1>(r); | |
87 | auto b = begin(v); | |
88 | static_assert( !ranges::random_access_range<decltype(r)> ); | |
89 | static_assert( std::sized_sentinel_for<decltype(b), decltype(b)> ); | |
90 | VERIFY( (next(b, 1) - b) == 1 ); | |
91 | const auto v_const = v; | |
92 | auto b_const = begin(v_const); | |
93 | VERIFY( (next(b_const, 2) - b_const) == 2 ); | |
94 | } | |
95 | ||
a25321ca PP |
96 | template<auto elements = views::elements<0>> |
97 | void | |
98 | test04() | |
99 | { | |
100 | // Verify SFINAE behavior. | |
101 | static_assert(!requires { elements(); }); | |
102 | static_assert(!requires { elements(0, 0); }); | |
103 | static_assert(!requires { elements(0); }); | |
104 | static_assert(!requires { 0 | elements; }); | |
105 | } | |
106 | ||
c7fe68f3 PP |
107 | void |
108 | test05() | |
109 | { | |
110 | // LWG 3502 | |
111 | std::vector<int> vec = {42}; | |
112 | auto r1 = vec | |
113 | | views::transform([](auto c) { return std::make_tuple(c, c); }) | |
114 | | views::keys; | |
115 | VERIFY( ranges::equal(r1, (int[]){42}) ); | |
116 | ||
117 | std::tuple<int, int> a[] = {{1,2},{3,4}}; | |
118 | auto r2 = a | views::keys; | |
119 | VERIFY( r2[0] == 1 && r2[1] == 3 ); | |
120 | } | |
121 | ||
2e2eef80 PP |
122 | void |
123 | test06() | |
124 | { | |
125 | // PR libstdc++/100631 | |
126 | auto r = views::iota(0) | |
127 | | views::filter([](int){ return true; }) | |
128 | | views::take(42) | |
129 | | views::reverse | |
130 | | views::transform([](int) { return std::make_pair(42, "hello"); }) | |
131 | | views::take(42) | |
132 | | views::keys; | |
133 | auto b = r.begin(); | |
134 | auto e = r.end(); | |
38751c4d PP |
135 | VERIFY( e - b == 42 ); |
136 | VERIFY( b - e == -42 ); | |
2e2eef80 PP |
137 | } |
138 | ||
139 | void | |
140 | test07() | |
141 | { | |
142 | // PR libstdc++/100631 comment #2 | |
143 | auto r = views::iota(0) | |
144 | | views::transform([](int) { return std::make_pair(42, "hello"); }) | |
145 | | views::keys; | |
146 | auto b = ranges::cbegin(r); | |
147 | auto e = ranges::end(r); | |
148 | b.base() == e.base(); | |
149 | b == e; | |
150 | } | |
151 | ||
cba9ef06 PP |
152 | int |
153 | main() | |
154 | { | |
155 | test01(); | |
4be16d1c | 156 | test02(); |
2ec58cfc | 157 | test03(); |
a25321ca | 158 | test04(); |
c7fe68f3 | 159 | test05(); |
2e2eef80 PP |
160 | test06(); |
161 | test07(); | |
cba9ef06 | 162 | } |