]>
Commit | Line | Data |
---|---|---|
7adcbafe | 1 | // Copyright (C) 2020-2022 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 <testsuite_hooks.h> | |
24 | #include <testsuite_iterators.h> | |
25 | ||
26 | namespace ranges = std::ranges; | |
27 | namespace views = std::ranges::views; | |
28 | ||
29 | void | |
30 | test01() | |
31 | { | |
32 | int x[] = {1,2,3,4,5}; | |
33 | auto v = views::all(x); | |
34 | ||
35 | static_assert(ranges::view<decltype(v)>); | |
36 | static_assert(ranges::random_access_range<decltype(v)>); | |
37 | ||
38 | VERIFY( ranges::size(v) == 5 ); | |
39 | VERIFY( ranges::size(x | views::all) == 5 ); | |
40 | VERIFY( ranges::size(v | views::all | views::all) == 5 ); | |
41 | VERIFY( ranges::size(v | (views::all | views::all)) == 5 ); | |
42 | ||
43 | ranges::reverse(v); | |
44 | VERIFY( ranges::equal(v, (int[]){5,4,3,2,1}) ); | |
45 | } | |
46 | ||
47 | void | |
48 | test02() | |
49 | { | |
50 | int x[5] = { 0 }; | |
51 | int k = 0; | |
52 | for (auto&& i : ranges::ref_view{x}) | |
53 | i += ++k; | |
54 | VERIFY( ranges::equal(x, (int[]){1,2,3,4,5}) ); | |
55 | } | |
56 | ||
57 | constexpr bool | |
58 | test03() | |
59 | { | |
60 | std::array ints{0,1,2,3,4,5}; | |
61 | auto even = [] (int i) { return i%2==0; }; | |
62 | auto odd = [] (int i) { return i%2==1; }; | |
63 | auto square = [] (int i) { return i*i; }; | |
64 | int sum = 0; | |
65 | for (auto v : (ints | |
66 | | (views::all | |
67 | | (views::filter(even) | |
68 | | (views::filter(odd) | views::all))) | |
69 | | views::transform(square))) | |
70 | sum += v; | |
71 | return sum == 0; | |
72 | } | |
73 | ||
74 | constexpr bool | |
75 | test04() | |
76 | { | |
77 | auto odd = [] (int i) { return i%2==1; }; | |
78 | auto square = [] (int i) { return i*i; }; | |
79 | auto increment = [] (int i) { return i+1; }; | |
80 | auto small = [] (int i) { return i<30; }; | |
81 | auto non_negative = [] (int i) { return i>=0; }; | |
82 | auto negative = [] (int i) { return i<0; }; | |
83 | return ranges::equal(views::iota(-5) | |
84 | | views::drop_while(negative) | |
85 | | views::take_while(non_negative) | |
86 | | views::transform(increment) | |
87 | | views::filter(odd) | |
88 | | views::take(3) | |
89 | | views::all | |
90 | | views::transform(square), | |
91 | views::iota(-5) | |
92 | | views::drop_while(negative) | |
93 | | views::drop(1) | |
94 | | views::filter(odd) | |
95 | | views::transform(square) | |
96 | | views::take_while(small) | |
97 | | views::take_while(small)); | |
98 | } | |
99 | ||
100 | static_assert(std::is_empty_v<decltype(views::common | |
101 | | views::join | |
102 | | views::all | |
103 | | views::common | |
104 | | views::keys | |
105 | | views::reverse)>); | |
a25321ca PP |
106 | #if 0 |
107 | // Adding empty range adaptor closure objects to a pipeline used to not | |
108 | // increase the size of the pipeline, but now that our range adaptor closure | |
109 | // objects derive from a common empty base class, [[no_unique_address]] can no | |
110 | // longer make two empty adjacent range adaptor closure objects occupy the same | |
111 | // data member address. | |
cba9ef06 PP |
112 | static_assert(sizeof(decltype(views::take(5) | views::drop(5))) |
113 | == sizeof(decltype(views::take(5) | |
114 | | views::join | |
115 | | views::common | |
116 | | views::all | |
117 | | views::keys | |
118 | | views::drop(5) | |
119 | | views::reverse))); | |
a25321ca PP |
120 | #endif |
121 | ||
122 | template<auto all = views::all> | |
123 | void | |
124 | test05() | |
125 | { | |
126 | // Verify SFINAE behavior. | |
127 | static_assert(!requires { all(); }); | |
128 | static_assert(!requires { all(0, 0); }); | |
129 | static_assert(!requires { all(0); }); | |
130 | static_assert(!requires { 0 | all; }); | |
131 | } | |
cba9ef06 | 132 | |
9245b0e8 JW |
133 | template<bool B1, bool B2> |
134 | struct BorrowedRange | |
135 | { | |
136 | int* ptr = nullptr; | |
137 | ||
138 | BorrowedRange(int (&arr)[3]) noexcept : ptr(arr) { } | |
139 | ||
140 | int* begin() const noexcept(B1) { return ptr; } | |
141 | int* end() const noexcept(B2) { return ptr + 3; } | |
142 | }; | |
143 | ||
144 | template<bool B1, bool B2> | |
145 | const bool std::ranges::enable_borrowed_range<BorrowedRange<B1, B2>> = true; | |
146 | ||
147 | void | |
148 | test06() | |
149 | { | |
150 | int x[] { 1, 2, 3 }; | |
151 | ||
152 | // Using ref_view: | |
153 | static_assert(noexcept(views::all(x))); | |
154 | ||
155 | // Using subrange: | |
156 | static_assert(noexcept(views::all(BorrowedRange<true, true>(x)))); | |
157 | static_assert(!noexcept(views::all(BorrowedRange<true, false>(x)))); | |
158 | static_assert(!noexcept(views::all(BorrowedRange<false, true>(x)))); | |
159 | static_assert(!noexcept(views::all(BorrowedRange<false, false>(x)))); | |
160 | } | |
161 | ||
a2c2dcc6 PP |
162 | void |
163 | test07() | |
164 | { | |
165 | // LWG 3481 | |
166 | struct view_t : ranges::empty_view<int> { // move-only view | |
167 | view_t(const view_t&) = delete; | |
168 | view_t(view_t&&) = default; | |
169 | view_t& operator=(const view_t&) = delete; | |
170 | view_t& operator=(view_t&&) = default; | |
171 | }; | |
172 | static_assert(std::movable<view_t> && !std::copyable<view_t>); | |
173 | static_assert(!ranges::viewable_range<view_t&>); | |
174 | } | |
175 | ||
cba9ef06 PP |
176 | int |
177 | main() | |
178 | { | |
179 | test01(); | |
180 | test02(); | |
181 | static_assert(test03()); | |
182 | static_assert(test04()); | |
a25321ca | 183 | test05(); |
9245b0e8 | 184 | test06(); |
a2c2dcc6 | 185 | test07(); |
cba9ef06 | 186 | } |