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8d9254fc | 1 | // Copyright (C) 2019-2020 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 | ||
18 | // { dg-options "-std=gnu++2a" } | |
19 | // { dg-do run { target c++2a } } | |
20 | ||
328b52d6 | 21 | #include <ranges> |
6d0dff49 JW |
22 | #include <testsuite_hooks.h> |
23 | #include <testsuite_iterators.h> | |
24 | ||
25 | void | |
26 | test01() | |
27 | { | |
28 | constexpr int a[10] = { }; | |
29 | static_assert( std::ranges::size(a) == 10 ); | |
30 | static_assert( noexcept(std::ranges::size(a)) ); | |
31 | ||
32 | int a2[2]; | |
33 | VERIFY( std::ranges::size(a2) == 2); | |
34 | static_assert( noexcept(std::ranges::size(a2)) ); | |
beaecb2d JW |
35 | |
36 | struct Incomplete; | |
37 | using A = Incomplete[2]; // bounded array of incomplete type | |
38 | extern A& f(); | |
39 | static_assert( std::same_as<decltype(std::ranges::size(f())), std::size_t> ); | |
6d0dff49 JW |
40 | } |
41 | ||
42 | void | |
43 | test02() | |
44 | { | |
45 | struct R | |
46 | { | |
47 | int size() { return 1; } | |
48 | long size() const noexcept { return 2; } | |
49 | }; | |
50 | R r; | |
51 | const R& c = r; | |
52 | VERIFY( std::ranges::size(r) == 1 ); | |
53 | static_assert( !noexcept(std::ranges::size(r)) ); | |
54 | VERIFY( std::ranges::size(c) == 2L ); | |
55 | static_assert( noexcept(std::ranges::size(c)) ); | |
56 | ||
57 | int a[3] = { }; | |
58 | __gnu_test::test_sized_range<int, __gnu_test::input_iterator_wrapper> ri(a); | |
59 | VERIFY( std::ranges::size(ri) == 3 ); | |
60 | static_assert( noexcept(std::ranges::size(ri)) ); | |
61 | } | |
62 | ||
63 | struct R3 | |
64 | { | |
65 | int* size() { return nullptr; } | |
66 | friend int size(R3&) noexcept { return 1; } | |
67 | friend long size(const R3&) { return 2L; } | |
68 | friend unsigned int size(R3&&) { return 3U; } | |
69 | friend unsigned long size(const R3&&) noexcept { return 4UL; } | |
70 | }; | |
71 | ||
72 | void | |
73 | test03() | |
74 | { | |
75 | R3 r; | |
76 | const R3& c = r; | |
77 | VERIFY( std::ranges::size(r) == 1 ); | |
78 | static_assert( noexcept(std::ranges::size(r)) ); | |
79 | VERIFY( std::ranges::size(std::move(r)) == 3U ); | |
80 | static_assert( !noexcept(std::ranges::size(std::move(r))) ); | |
81 | VERIFY( std::ranges::size(c) == 2L ); | |
82 | static_assert( !noexcept(std::ranges::size(c)) ); | |
83 | VERIFY( std::ranges::size(std::move(c)) == 4UL ); | |
84 | static_assert( noexcept(std::ranges::size(std::move(c))) ); | |
85 | } | |
86 | ||
87 | void | |
88 | test04() | |
89 | { | |
90 | int a[] = { 0, 1 }; | |
91 | __gnu_test::test_range<int, __gnu_test::random_access_iterator_wrapper> r(a); | |
beaecb2d | 92 | VERIFY( std::ranges::size(r) == unsigned(std::ranges::end(r) - std::ranges::begin(r)) ); |
6d0dff49 JW |
93 | } |
94 | ||
95 | struct R5 | |
96 | { | |
97 | int size() const noexcept { return 0; } | |
98 | R5* begin() { return this; } | |
99 | R5* end() { return this + 1; } | |
100 | }; | |
101 | ||
102 | template<> | |
103 | constexpr bool std::ranges::disable_sized_range<R5> = true; | |
104 | ||
105 | void | |
106 | test05() | |
107 | { | |
108 | R5 r; | |
109 | VERIFY( std::ranges::size(r) == 1 ); | |
110 | } | |
111 | ||
112 | int | |
113 | main() | |
114 | { | |
115 | test01(); | |
116 | test02(); | |
117 | test03(); | |
118 | test04(); | |
119 | test05(); | |
120 | } |