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a945c346 | 1 | // Copyright (C) 2019-2024 Free Software Foundation, Inc. |
6d0dff49 JW |
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 | ||
d4ac20b0 | 18 | // { dg-do run { target c++20 } } |
6d0dff49 | 19 | |
328b52d6 | 20 | #include <ranges> |
261d5a4a | 21 | #include <utility> // as_const |
6d0dff49 | 22 | #include <testsuite_hooks.h> |
b9e35ee6 JW |
23 | #include <testsuite_iterators.h> |
24 | ||
25 | static_assert(__gnu_test::is_customization_point_object(std::ranges::cbegin)); | |
26 | ||
6d0dff49 JW |
27 | using std::same_as; |
28 | ||
29 | void | |
30 | test01() | |
31 | { | |
32 | int a[2] = {}; | |
33 | ||
34 | static_assert(same_as<decltype(std::ranges::cbegin(a)), const int*>); | |
35 | static_assert(noexcept(std::ranges::cbegin(a))); | |
36 | VERIFY( std::ranges::cbegin(a) == (a + 0) ); | |
37 | ||
38 | constexpr long b[2] = {}; | |
39 | static_assert( std::ranges::cbegin(b) == (b + 0) ); | |
40 | } | |
41 | ||
42 | struct R | |
43 | { | |
44 | int a[4] = { 0, 1, 2, 3 }; | |
45 | ||
46 | friend int* begin(R& r) { return r.a + 0; } | |
b5b2e387 | 47 | friend int* begin(R&&); // this function is not defined |
6d0dff49 | 48 | friend const int* begin(const R& r) noexcept { return r.a + 2; } |
b5b2e387 | 49 | friend const int* begin(const R&&); // this function is not defined |
f12e26f3 JW |
50 | |
51 | #if __cpp_lib_ranges_as_const | |
52 | friend const int* end(const R&) noexcept; // C++23 requires this. | |
53 | #endif | |
6d0dff49 JW |
54 | }; |
55 | ||
b5b2e387 JW |
56 | struct RV // view on an R |
57 | { | |
58 | R& r; | |
59 | ||
60 | friend int* begin(RV&); // this function is not defined | |
61 | friend const int* begin(const RV& rv) noexcept { return begin(std::as_const(rv.r)); } | |
f12e26f3 JW |
62 | |
63 | #if __cpp_lib_ranges_as_const | |
64 | friend const int* end(const RV&) noexcept; // C++23 requires this. | |
65 | #endif | |
b5b2e387 JW |
66 | }; |
67 | ||
68 | // Allow ranges::begin to work with RV&& | |
15411a64 | 69 | template<> constexpr bool std::ranges::enable_borrowed_range<RV> = true; |
b5b2e387 | 70 | |
6d0dff49 JW |
71 | void |
72 | test03() | |
73 | { | |
74 | R r; | |
75 | const R& c = r; | |
76 | VERIFY(std::ranges::cbegin(r) == std::ranges::begin(c)); | |
6d0dff49 | 77 | VERIFY(std::ranges::cbegin(c) == std::ranges::begin(c)); |
b5b2e387 JW |
78 | |
79 | RV v{r}; | |
80 | VERIFY(std::ranges::cbegin(std::move(v)) == std::ranges::begin(c)); | |
81 | const RV cv{r}; | |
82 | VERIFY(std::ranges::cbegin(std::move(cv)) == std::ranges::begin(c)); | |
6d0dff49 JW |
83 | } |
84 | ||
85 | struct RR | |
86 | { | |
87 | short s = 0; | |
88 | long l = 0; | |
89 | int a[4] = { 0, 1, 2, 3 }; | |
90 | ||
91 | short* begin() noexcept { return &s; } | |
92 | const long* begin() const { return &l; } | |
93 | ||
94 | friend int* begin(RR& r) { return r.a + 0; } | |
95 | friend int* begin(RR&& r) { return r.a + 1; } | |
96 | friend const int* begin(const RR& r) { return r.a + 2; } | |
97 | friend const int* begin(const RR&& r) noexcept { return r.a + 3; } | |
f12e26f3 JW |
98 | |
99 | #if __cpp_lib_ranges_as_const | |
100 | short* end() noexcept { return &s + 1; } // C++23 requires this. | |
101 | const long* end() const { return &l + 1; } // C++23 requires this. | |
102 | #endif | |
6d0dff49 JW |
103 | }; |
104 | ||
b5b2e387 | 105 | // N.B. this is a lie, cbegin on an RR rvalue will return a dangling pointer. |
15411a64 | 106 | template<> constexpr bool std::ranges::enable_borrowed_range<RR> = true; |
b5b2e387 | 107 | |
6d0dff49 JW |
108 | void |
109 | test04() | |
110 | { | |
111 | RR r; | |
112 | const RR& c = r; | |
113 | VERIFY(std::ranges::cbegin(r) == std::ranges::begin(c)); | |
b5b2e387 | 114 | VERIFY(std::ranges::cbegin(std::move(r)) == std::ranges::begin(c)); |
6d0dff49 | 115 | VERIFY(std::ranges::cbegin(c) == std::ranges::begin(c)); |
b5b2e387 | 116 | VERIFY(std::ranges::cbegin(std::move(c)) == std::ranges::begin(c)); |
6d0dff49 JW |
117 | } |
118 | ||
119 | int | |
120 | main() | |
121 | { | |
122 | test01(); | |
123 | test03(); | |
124 | test04(); | |
125 | } |