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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> | |
ba49e9eb | 22 | #include <forward_list> |
cba9ef06 PP |
23 | #include <ranges> |
24 | #include <testsuite_hooks.h> | |
25 | #include <testsuite_iterators.h> | |
26 | ||
27 | using __gnu_test::test_range; | |
28 | using __gnu_test::forward_iterator_wrapper; | |
29 | ||
30 | namespace ranges = std::ranges; | |
31 | namespace views = std::ranges::views; | |
32 | ||
33 | void | |
34 | test01() | |
35 | { | |
36 | auto p = [] (int i) { return i != 16; }; | |
37 | auto v = views::iota(10) | views::take_while(p); | |
38 | VERIFY( ranges::equal(v, (int[]){10,11,12,13,14,15}) ); | |
39 | using R = decltype(v); | |
40 | static_assert(ranges::view<R>); | |
41 | static_assert(!ranges::common_range<R>); | |
42 | static_assert(ranges::random_access_range<R>); | |
43 | } | |
44 | ||
45 | void | |
46 | test02() | |
47 | { | |
48 | int x[] = {1,2,3,4,5}; | |
49 | test_range<int, forward_iterator_wrapper> rx(x); | |
50 | auto v = rx | views::take_while([] (int i) { return i<4; }); | |
51 | VERIFY( ranges::equal(v, (int[]){1,2,3}) ); | |
52 | using R = decltype(v); | |
53 | static_assert(ranges::view<R>); | |
54 | static_assert(!ranges::common_range<R>); | |
55 | static_assert(ranges::forward_range<R>); | |
56 | } | |
57 | ||
ba49e9eb PP |
58 | void |
59 | test03() | |
60 | { | |
61 | std::forward_list<int> x = {1,2,3,4,5}; | |
62 | auto v | |
63 | = x | views::transform(std::negate{}) | views::take_while(std::identity{}); | |
64 | ||
65 | // Verify that _Sentinel<false> is implicitly convertible to _Sentinel<true>. | |
66 | static_assert(!ranges::common_range<decltype(v)>); | |
67 | static_assert(!std::same_as<decltype(ranges::end(v)), | |
68 | decltype(ranges::cend(v))>); | |
69 | auto b = ranges::cend(v); | |
70 | b = ranges::end(v); | |
71 | } | |
72 | ||
c5aad5a4 PP |
73 | void |
74 | test04() | |
75 | { | |
76 | // LWG 3450 | |
77 | auto v = views::single(1) | views::take_while([](int& x) { return true;}); | |
78 | static_assert(ranges::range<decltype(v)>); | |
79 | static_assert(!ranges::range<decltype(v) const>); | |
80 | } | |
81 | ||
a25321ca PP |
82 | template<auto take_while = views::take_while> |
83 | void | |
84 | test05() | |
85 | { | |
86 | // Verify SFINAE behavior. | |
87 | extern int x[5]; | |
88 | auto p = [] (int*) { return true; }; | |
89 | static_assert(!requires { take_while(); }); | |
90 | static_assert(!requires { take_while(x, p, p); }); | |
91 | static_assert(!requires { take_while(x, p); }); | |
92 | static_assert(!requires { take_while(p)(x); }); | |
93 | static_assert(!requires { x | (take_while(p) | views::all); }); | |
94 | static_assert(!requires { (take_while(p) | views::all)(x); }); | |
95 | static_assert(!requires { take_while | views::all; }); | |
96 | static_assert(!requires { views::all | take_while; }); | |
97 | } | |
98 | ||
cba9ef06 PP |
99 | int |
100 | main() | |
101 | { | |
102 | test01(); | |
103 | test02(); | |
ba49e9eb | 104 | test03(); |
c5aad5a4 | 105 | test04(); |
a25321ca | 106 | test05(); |
cba9ef06 | 107 | } |