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83ffe9cd | 1 | // Copyright (C) 2020-2023 Free Software Foundation, Inc. |
7ab36231 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 | ||
21 | #include <ranges> | |
22 | #include <testsuite_hooks.h> | |
23 | #include <testsuite_iterators.h> | |
24 | ||
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25 | static_assert(__gnu_test::is_customization_point_object(std::ranges::ssize)); |
26 | ||
7ab36231 JW |
27 | using std::ptrdiff_t; |
28 | ||
29 | void | |
30 | test01() | |
31 | { | |
32 | constexpr int a[10] = { }; | |
33 | static_assert( std::same_as<decltype(std::ranges::ssize(a)), ptrdiff_t> ); | |
34 | static_assert( std::ranges::ssize(a) == 10 ); | |
35 | static_assert( noexcept(std::ranges::ssize(a)) ); | |
36 | ||
37 | int a2[2]; | |
38 | static_assert( std::same_as<decltype(std::ranges::ssize(a2)), ptrdiff_t> ); | |
39 | VERIFY( std::ranges::ssize(a2) == 2); | |
40 | static_assert( noexcept(std::ranges::ssize(a2)) ); | |
7ab36231 JW |
41 | } |
42 | ||
43 | void | |
44 | test02() | |
45 | { | |
46 | int a[3] = { }; | |
47 | __gnu_test::test_sized_range<int, __gnu_test::input_iterator_wrapper> ri(a); | |
48 | VERIFY( std::ranges::ssize(ri) == 3 ); | |
49 | static_assert( noexcept(std::ranges::ssize(ri)) ); | |
50 | } | |
51 | ||
52 | void | |
53 | test04() | |
54 | { | |
55 | int a[] = { 0, 1 }; | |
56 | __gnu_test::test_range<int, __gnu_test::random_access_iterator_wrapper> r(a); | |
57 | VERIFY( std::ranges::ssize(r) == std::ranges::end(r) - std::ranges::begin(r) ); | |
58 | } | |
59 | ||
60 | struct R5 | |
61 | { | |
62 | int size() const noexcept { return 0; } | |
63 | R5* begin() { return this; } | |
64 | R5* end() { return this + 1; } | |
65 | }; | |
66 | ||
67 | template<> | |
68 | constexpr bool std::ranges::disable_sized_range<R5> = true; | |
69 | ||
70 | void | |
71 | test05() | |
72 | { | |
73 | R5 r; | |
74 | VERIFY( std::ranges::ssize(r) == 1 ); | |
75 | } | |
76 | ||
77 | void | |
78 | test06() | |
79 | { | |
5586e506 | 80 | auto i = std::views::iota(1ull, 5u); |
621ea10c JW |
81 | auto s = std::ranges::size(i); |
82 | auto ss = std::ranges::ssize(i); | |
83 | // std::ranges::range_difference_t<decltype(i)> is larger than long long, | |
84 | // but LWG 3403 says ranges::ssize(i) returns the signed version of the | |
85 | // type that ranges::size(i) returns, not the range's difference_type. | |
86 | static_assert( std::same_as<decltype(ss), std::make_signed_t<decltype(s)>> ); | |
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87 | VERIFY( s == 4 ); |
88 | } | |
89 | ||
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90 | void |
91 | test07() | |
92 | { | |
93 | #ifdef __SIZEOF_INT128__ | |
94 | struct R | |
95 | { | |
96 | unsigned __int128 size() const { return 4; } | |
97 | }; | |
98 | R r; | |
99 | static_assert( std::same_as<decltype(std::ranges::ssize(r)), __int128> ); | |
100 | VERIFY( std::ranges::ssize(r) == 4 ); | |
101 | #endif | |
102 | } | |
103 | ||
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104 | int |
105 | main() | |
106 | { | |
107 | test01(); | |
108 | test02(); | |
109 | test04(); | |
110 | test05(); | |
111 | test06(); | |
96963713 | 112 | test07(); |
7ab36231 | 113 | } |