1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
|
//===----------------------------------------------------------------------===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
// UNSUPPORTED: c++03, c++11, c++14, c++17, c++20, c++23
// <string>
// [string.op.plus]
//
// template<class charT, class traits, class Allocator>
// constexpr basic_string<charT, traits, Allocator>
// operator+(const basic_string<charT, traits, Allocator>& lhs,
// type_identity_t<basic_string_view<charT, traits>> rhs); // Since C++26
// template<class charT, class traits, class Allocator>
// constexpr basic_string<charT, traits, Allocator>
// operator+(basic_string<charT, traits, Allocator>&& lhs,
// type_identity_t<basic_string_view<charT, traits>> rhs); // Since C++26
// template<class charT, class traits, class Allocator>
// constexpr basic_string<charT, traits, Allocator>
// operator+(type_identity_t<basic_string_view<charT, traits>> lhs,
// const basic_string<charT, traits, Allocator>& rhs); // Since C++26
// template<class charT, class traits, class Allocator>
// constexpr basic_string<charT, traits, Allocator>
// operator+(type_identity_t<basic_string_view<charT, traits>> lhs,
// basic_string<charT, traits, Allocator>&& rhs); // Since C++26
#include <cassert>
#include <concepts>
#include <string>
#include <utility>
#include "asan_testing.h"
#include "constexpr_char_traits.h"
#include "make_string.h"
#include "min_allocator.h"
#include "test_allocator.h"
#include "test_macros.h"
template <typename CharT, class TraitsT = std::char_traits<CharT>>
class ConvertibleToStringView {
public:
constexpr explicit ConvertibleToStringView(const CharT* cs) : cs_{cs} {}
constexpr operator std::basic_string_view<CharT, TraitsT>() { return std::basic_string_view<CharT, TraitsT>(cs_); }
constexpr operator std::basic_string_view<CharT, TraitsT>() const {
return std::basic_string_view<CharT, TraitsT>(cs_);
}
private:
const CharT* cs_;
};
static_assert(std::constructible_from<std::basic_string_view<char>, const ConvertibleToStringView<char>>);
static_assert(std::convertible_to<const ConvertibleToStringView<char>, std::basic_string_view<char>>);
static_assert(std::constructible_from<std::basic_string_view<char>, ConvertibleToStringView<char>>);
static_assert(std::convertible_to<ConvertibleToStringView<char>, std::basic_string_view<char>>);
#define CS(S) MAKE_CSTRING(CharT, S)
template <template <typename, typename> typename StringViewT, typename CharT, typename TraitsT, typename AllocT>
constexpr void test(const CharT* x, const CharT* y, const CharT* expected) {
AllocT allocator;
// string& + string_view
{
std::basic_string<CharT, TraitsT, AllocT> st{x, allocator};
StringViewT<CharT, TraitsT> sv{y};
std::same_as<std::basic_string<CharT, TraitsT, AllocT>> decltype(auto) result = st + sv;
assert(result == expected);
assert(result.get_allocator() == allocator);
LIBCPP_ASSERT(is_string_asan_correct(st + sv));
}
// const string& + string_view
{
const std::basic_string<CharT, TraitsT, AllocT> st{x, allocator};
StringViewT<CharT, TraitsT> sv{y};
std::same_as<std::basic_string<CharT, TraitsT, AllocT>> decltype(auto) result = st + sv;
assert(result == expected);
assert(result.get_allocator() == allocator);
LIBCPP_ASSERT(is_string_asan_correct(st + sv));
}
// string&& + string_view
{
std::basic_string<CharT, TraitsT, AllocT> st{x, allocator};
StringViewT<CharT, TraitsT> sv{y};
std::same_as<std::basic_string<CharT, TraitsT, AllocT>> decltype(auto) result = std::move(st) + sv;
assert(result == expected);
assert(result.get_allocator() == allocator);
LIBCPP_ASSERT(is_string_asan_correct(std::move(st) + sv));
}
// string_view + string&
{
StringViewT<CharT, TraitsT> sv{x};
std::basic_string<CharT, TraitsT, AllocT> st{y, allocator};
std::same_as<std::basic_string<CharT, TraitsT, AllocT>> decltype(auto) result = sv + st;
assert(result == expected);
assert(result.get_allocator() == allocator);
LIBCPP_ASSERT(is_string_asan_correct(sv + st));
}
// string_view + const string&
{
StringViewT<CharT, TraitsT> sv{x};
const std::basic_string<CharT, TraitsT, AllocT> st{y, allocator};
std::same_as<std::basic_string<CharT, TraitsT, AllocT>> decltype(auto) result = sv + st;
assert(result == expected);
assert(result.get_allocator() == allocator);
LIBCPP_ASSERT(is_string_asan_correct(sv + st));
}
// string_view + string&&
{
// TODO: Remove workaround once https://github.com/llvm/llvm-project/issues/92382 is fixed.
// Create a `basic_string` to workaround clang bug:
// https://github.com/llvm/llvm-project/issues/92382
// Comparison between pointers to a string literal and some other object results in constant evaluation failure.
if constexpr (std::same_as<StringViewT<CharT, TraitsT>, std::basic_string_view<CharT, TraitsT>>) {
std::basic_string<CharT, TraitsT, AllocT> st_{x, allocator};
StringViewT<CharT, TraitsT> sv{st_};
std::basic_string<CharT, TraitsT, AllocT> st{y, allocator};
std::same_as<std::basic_string<CharT, TraitsT, AllocT>> decltype(auto) result = sv + std::move(st);
assert(result == expected);
assert(result.get_allocator() == allocator);
LIBCPP_ASSERT(is_string_asan_correct(sv + std::move(st)));
}
}
}
template <template <typename, typename> typename StringViewT,
typename CharT,
typename TraitsT,
typename AllocT = std::allocator<CharT>>
constexpr void test() {
// Concatenate with an empty `string`/`string_view`
test<StringViewT, CharT, TraitsT, AllocT>(CS(""), CS(""), CS(""));
test<StringViewT, CharT, TraitsT, AllocT>(CS(""), CS("short"), CS("short"));
test<StringViewT, CharT, TraitsT, AllocT>(CS(""), CS("not so short"), CS("not so short"));
test<StringViewT, CharT, TraitsT, AllocT>(
CS(""), CS("this is a much longer string"), CS("this is a much longer string"));
test<StringViewT, CharT, TraitsT, AllocT>(CS(""), CS(""), CS(""));
test<StringViewT, CharT, TraitsT, AllocT>(CS("short"), CS(""), CS("short"));
test<StringViewT, CharT, TraitsT, AllocT>(CS("not so short"), CS(""), CS("not so short"));
test<StringViewT, CharT, TraitsT, AllocT>(
CS("this is a much longer string"), CS(""), CS("this is a much longer string"));
// Non empty
test<StringViewT, CharT, TraitsT, AllocT>(CS("B"), CS("D"), CS("BD"));
test<StringViewT, CharT, TraitsT, AllocT>(CS("zmt94"), CS("+hkt82"), CS("zmt94+hkt82"));
test<StringViewT, CharT, TraitsT, AllocT>(CS("not so short"), CS("+is not bad"), CS("not so short+is not bad"));
test<StringViewT, CharT, TraitsT, AllocT>(
CS("this is a much longer string"),
CS("+which is so much better"),
CS("this is a much longer string+which is so much better"));
}
template <template <typename, typename> typename StringViewT, typename CharT>
constexpr bool test() {
test<StringViewT, CharT, std::char_traits<CharT>>();
test<StringViewT, CharT, std::char_traits<CharT>, min_allocator<CharT>>();
test<StringViewT, CharT, std::char_traits<CharT>, safe_allocator<CharT>>();
test<StringViewT, CharT, std::char_traits<CharT>, test_allocator<CharT>>();
test<StringViewT, CharT, constexpr_char_traits<CharT>>();
test<StringViewT, CharT, constexpr_char_traits<CharT>, min_allocator<CharT>>();
test<StringViewT, CharT, constexpr_char_traits<CharT>, safe_allocator<CharT>>();
test<StringViewT, CharT, constexpr_char_traits<CharT>, test_allocator<CharT>>();
return true;
}
int main(int, char**) {
// std::basic_string_view
test<std::basic_string_view, char>();
static_assert(test<std::basic_string_view, char>());
#ifndef TEST_HAS_NO_WIDE_CHARACTERS
test<std::basic_string_view, wchar_t>();
static_assert(test<std::basic_string_view, wchar_t>());
#endif
#ifndef TEST_HAS_NO_CHAR8_T
test<std::basic_string_view, char8_t>();
static_assert(test<std::basic_string_view, char8_t>());
#endif
test<std::basic_string_view, char16_t>();
static_assert(test<std::basic_string_view, char16_t>());
test<std::basic_string_view, char32_t>();
static_assert(test<std::basic_string_view, char32_t>());
// ConvertibleToStringView
test<ConvertibleToStringView, char>();
static_assert(test<ConvertibleToStringView, char>());
#ifndef TEST_HAS_NO_WIDE_CHARACTERS
test<ConvertibleToStringView, wchar_t>();
static_assert(test<ConvertibleToStringView, wchar_t>());
#endif
#ifndef TEST_HAS_NO_CHAR8_T
test<ConvertibleToStringView, char8_t>();
static_assert(test<ConvertibleToStringView, char8_t>());
#endif
test<ConvertibleToStringView, char16_t>();
static_assert(test<ConvertibleToStringView, char16_t>());
test<ConvertibleToStringView, char32_t>();
static_assert(test<ConvertibleToStringView, char32_t>());
return 0;
}
|
