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a945c346 | 1 | // Copyright (C) 2021-2024 Free Software Foundation, Inc. |
7c100613 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 | ||
7c100613 JW |
18 | // { dg-do run { target c++23 } } |
19 | ||
20 | #include <string_view> | |
21 | #include <testsuite_hooks.h> | |
22 | ||
23 | void | |
24 | test01() | |
25 | { | |
26 | struct R | |
27 | { | |
28 | const wchar_t* begin() const | |
29 | { return str; } | |
30 | ||
31 | const wchar_t* end() const | |
32 | { return str + std::char_traits<wchar_t>::length(str); } | |
33 | ||
34 | const wchar_t* str = L"Home on the range"; | |
35 | }; | |
36 | ||
37 | R r; | |
2678386d | 38 | std::wstring_view s{r}; |
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39 | VERIFY( s == r.str ); |
40 | VERIFY( s.data() == std::ranges::data(r) ); | |
41 | VERIFY( s.size() == std::ranges::size(r) ); | |
42 | ||
43 | struct R2 : R | |
44 | { | |
45 | using R::begin; | |
46 | using R::end; | |
47 | operator std::wstring_view() const { return L"Out of range"; } | |
48 | }; | |
49 | static_assert( std::ranges::contiguous_range<R2> ); | |
50 | static_assert( std::ranges::sized_range<R2> ); | |
51 | R2 r2; | |
2678386d | 52 | std::wstring_view s2(r2); // uses conversion to wstring_view |
7c100613 JW |
53 | VERIFY( s2 == L"Out of range" ); |
54 | VERIFY( std::wstring_view(const_cast<const R2&>(r2)) == s2 ); | |
55 | ||
2678386d JW |
56 | // And again using copy-initialization instead of direct-initialization. |
57 | std::wstring_view s2_implicit = r2; // uses conversion to wstring_view | |
58 | VERIFY( s2_implicit == L"Out of range" ); | |
59 | VERIFY( std::wstring_view(const_cast<const R2&>(r2)) == s2_implicit ); | |
60 | ||
7c100613 JW |
61 | struct R3 : R |
62 | { | |
63 | using R::begin; | |
64 | using R::end; | |
65 | operator const wchar_t*() { return L"Orange"; } | |
66 | }; | |
67 | static_assert( std::ranges::contiguous_range<R3> ); | |
68 | static_assert( std::ranges::sized_range<R3> ); | |
69 | R3 r3; | |
70 | std::wstring_view s3(r3); // uses conversion to const wchar_t* | |
71 | VERIFY( s3 == L"Orange" ); | |
72 | s3 = std::wstring_view(const_cast<const R3&>(r3)); // uses range constructor | |
73 | VERIFY( s3 == L"Home on the range" ); | |
74 | ||
75 | struct R4 : R | |
76 | { | |
77 | using R::begin; | |
78 | using R::end; | |
79 | operator std::wstring_view() { return L"Strange"; } | |
80 | }; | |
81 | static_assert( std::ranges::contiguous_range<R4> ); | |
82 | static_assert( std::ranges::sized_range<R4> ); | |
83 | R4 r4; | |
84 | std::wstring_view s4 = r4; // Uses conversion to wstring_view | |
85 | VERIFY( s4 == L"Strange" ); | |
86 | // Cannot construct from const R4 because of non-const conversion op: | |
87 | static_assert( ! std::is_constructible_v<std::wstring_view, const R4&> ); | |
88 | ||
89 | struct R5 : R | |
90 | { | |
91 | using R::begin; | |
92 | using R::end; | |
93 | operator std::wstring_view() && { return L"Stranger"; } | |
94 | }; | |
95 | static_assert( std::ranges::contiguous_range<R5> ); | |
96 | static_assert( std::ranges::sized_range<R5> ); | |
97 | R5 r5; | |
2678386d | 98 | std::wstring_view s5(r5); // Uses range constructor |
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99 | VERIFY( s5 == r5.str ); |
100 | s5 = std::wstring_view(std::move(r5)); // In C++20 this used conversion op. | |
2678386d | 101 | VERIFY( s5 == r5.str ); // In C++23 it uses range constructor. |
7c100613 JW |
102 | |
103 | wchar_t arr[] = L"arrangement\0with\0nulls"; | |
104 | std::wstring_view sa = arr; // Does not use range constructor | |
105 | VERIFY( sa.data() == arr ); | |
106 | VERIFY( sa == L"arrangement" ); | |
107 | VERIFY( std::end(sa) != std::end(arr) ); | |
108 | } | |
109 | ||
110 | void | |
111 | test02() | |
112 | { | |
113 | using V1 = std::basic_string_view<char>; | |
114 | // range_value_t<V1> is not the right type | |
115 | static_assert( ! std::is_constructible_v<std::wstring_view, V1> ); | |
116 | ||
117 | using V2 = std::basic_string_view<wchar_t, __gnu_cxx::char_traits<wchar_t>>; | |
118 | // V2::traits_type is not the right type | |
119 | static_assert( ! std::is_constructible_v<std::wstring_view, V2> ); | |
120 | ||
121 | struct V3 : V2 | |
122 | { | |
123 | private: | |
124 | using V2::traits_type; | |
125 | }; | |
126 | // V3::traits_type is not a valid (accessible) type | |
127 | static_assert( std::is_constructible_v<std::wstring_view, V3> ); | |
128 | ||
129 | struct V4 : V2 | |
130 | { | |
131 | using traits_type = std::wstring_view::traits_type; | |
132 | }; | |
133 | // V4::traits_type is the right type | |
134 | static_assert( std::is_constructible_v<std::wstring_view, V4> ); | |
135 | } | |
136 | ||
137 | void | |
138 | test03() | |
139 | { | |
140 | struct R | |
141 | { | |
142 | wchar_t* begin() { return nullptr; } | |
143 | const wchar_t* begin() const noexcept { return nullptr; } | |
144 | ||
145 | wchar_t* end() { return nullptr; } | |
146 | const wchar_t* end() const noexcept { return nullptr; } | |
147 | }; | |
148 | ||
149 | static_assert( ! noexcept(std::wstring_view(std::declval<R&>())) ); | |
150 | static_assert( noexcept(std::wstring_view(std::declval<const R&>())) ); | |
151 | } | |
152 | ||
153 | void | |
154 | test04() | |
155 | { | |
156 | struct R | |
157 | { | |
158 | const wchar_t* begin() const { return nullptr; } | |
159 | const wchar_t* end() const { return nullptr; } | |
160 | }; | |
161 | ||
162 | R r; | |
2678386d | 163 | std::basic_string_view s(r); // Use deduction guide. |
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164 | |
165 | static_assert( std::is_same_v<decltype(s), std::wstring_view> ); | |
166 | } | |
167 | ||
2678386d JW |
168 | void |
169 | test05() | |
170 | { | |
171 | struct R | |
172 | { | |
173 | const wchar_t* begin() const { return nullptr; } | |
174 | const wchar_t* end() const { return nullptr; } | |
175 | }; | |
176 | ||
177 | // P2499R0 string_view range constructor should be explicit | |
178 | // P2516R0 string_view is implicitly convertible from what? | |
179 | static_assert( ! std::is_convertible_v<R, std::wstring_view> ); | |
180 | } | |
181 | ||
7c100613 JW |
182 | int main() |
183 | { | |
184 | test01(); | |
185 | test02(); | |
186 | test03(); | |
187 | test04(); | |
2678386d | 188 | test05(); |
7c100613 | 189 | } |