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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> | |
22 | #include <ranges> | |
23 | #include <testsuite_hooks.h> | |
24 | #include <testsuite_iterators.h> | |
25 | ||
26 | using __gnu_test::test_range; | |
27 | using __gnu_test::bidirectional_iterator_wrapper; | |
a1535015 PP |
28 | using __gnu_test::forward_iterator_wrapper; |
29 | using __gnu_test::random_access_iterator_wrapper; | |
cba9ef06 PP |
30 | |
31 | namespace ranges = std::ranges; | |
32 | namespace views = std::ranges::views; | |
33 | ||
34 | void | |
35 | test01() | |
36 | { | |
37 | auto p = [] (int i) { return i != 16; }; | |
38 | auto v = views::iota(10) | views::drop_while(p); | |
39 | VERIFY( ranges::equal(v | views::take(5), (int[]){16,17,18,19,20}) ); | |
40 | using R = decltype(v); | |
41 | static_assert(ranges::view<R>); | |
42 | static_assert(!ranges::common_range<R>); | |
43 | static_assert(ranges::random_access_range<R>); | |
44 | } | |
45 | ||
46 | void | |
47 | test02() | |
48 | { | |
49 | int x[] = {1,2,3,4,5}; | |
50 | test_range<int, bidirectional_iterator_wrapper> rx(x); | |
51 | auto v = rx | views::drop_while([] (int i) { return i<4; }); | |
52 | VERIFY( ranges::equal(v, (int[]){4,5}) ); | |
53 | using R = decltype(v); | |
54 | static_assert(ranges::view<R>); | |
55 | static_assert(!ranges::common_range<R>); | |
56 | static_assert(ranges::bidirectional_range<R>); | |
57 | } | |
58 | ||
a1535015 PP |
59 | // The following tests that drop_while_view::begin caches its result. |
60 | ||
61 | template<template<typename> typename wrapper> | |
62 | struct test_view : ranges::view_base | |
63 | { | |
64 | bool begin_already_called = false; | |
65 | static inline int x[] = {1,2,3,4,5}; | |
66 | test_range<int, wrapper> rx{x}; | |
67 | ||
68 | auto | |
69 | begin() | |
70 | { | |
71 | if (begin_already_called) | |
72 | x[0] = 10; | |
73 | begin_already_called = true; | |
74 | return rx.begin(); | |
75 | } | |
76 | ||
77 | auto | |
78 | end() | |
79 | { return rx.end(); } | |
80 | }; | |
81 | ||
82 | template<template<typename> typename wrapper> | |
83 | void | |
84 | test03() | |
85 | { | |
86 | auto v | |
87 | = test_view<wrapper>{} | views::drop_while([] (int i) { return i<3; }); | |
88 | VERIFY( ranges::equal(v, (int[]){3,4,5}) ); | |
89 | VERIFY( ranges::equal(v, (int[]){3,4,5}) ); | |
90 | } | |
91 | ||
a25321ca PP |
92 | template<auto drop_while = views::drop_while> |
93 | void | |
94 | test04() | |
95 | { | |
96 | // Verify SFINAE behavior. | |
97 | extern int x[5]; | |
98 | auto p = [] (int*) { return true; }; | |
99 | static_assert(!requires { drop_while(); }); | |
100 | static_assert(!requires { drop_while(x, p, p); }); | |
101 | static_assert(!requires { drop_while(x, p); }); | |
102 | static_assert(!requires { drop_while(p)(x); }); | |
103 | static_assert(!requires { x | (drop_while(p) | views::all); }); | |
104 | static_assert(!requires { (drop_while(p) | views::all)(x); }); | |
105 | static_assert(!requires { drop_while | views::all; }); | |
106 | static_assert(!requires { views::all | drop_while; }); | |
107 | } | |
108 | ||
cba9ef06 PP |
109 | int |
110 | main() | |
111 | { | |
112 | test01(); | |
113 | test02(); | |
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114 | test03<forward_iterator_wrapper>(); |
115 | test03<random_access_iterator_wrapper>(); | |
a25321ca | 116 | test04(); |
cba9ef06 | 117 | } |