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1 // Copyright 2013 The Chromium Authors. All rights reserved. | 1 // Copyright 2013 The Chromium Authors. All rights reserved. |
2 // Use of this source code is governed by a BSD-style license that can be | 2 // Use of this source code is governed by a BSD-style license that can be |
3 // found in the LICENSE file. | 3 // found in the LICENSE file. |
4 | 4 |
5 #ifndef BASE_STRINGS_STRING16_H_ | 5 #ifndef BASE_STRINGS_STRING16_H_ |
6 #define BASE_STRINGS_STRING16_H_ | 6 #define BASE_STRINGS_STRING16_H_ |
7 | 7 |
8 // WHAT: | 8 // WHAT: |
9 // A version of std::basic_string that provides 2-byte characters even when | 9 // A version of std::basic_string that provides 2-byte characters even when |
10 // wchar_t is not implemented as a 2-byte type. You can access this class as | 10 // wchar_t is not implemented as a 2-byte type. You can access this class as |
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22 // entirely improper on those systems where the encoding of wchar_t is defined | 22 // entirely improper on those systems where the encoding of wchar_t is defined |
23 // as UTF-32. | 23 // as UTF-32. |
24 // | 24 // |
25 // Here, we define string16, which is similar to std::wstring but replaces all | 25 // Here, we define string16, which is similar to std::wstring but replaces all |
26 // libc functions with custom, 2-byte-char compatible routines. It is capable | 26 // libc functions with custom, 2-byte-char compatible routines. It is capable |
27 // of carrying UTF-16-encoded data. | 27 // of carrying UTF-16-encoded data. |
28 | 28 |
29 #include <stddef.h> | 29 #include <stddef.h> |
30 #include <stdint.h> | 30 #include <stdint.h> |
31 #include <stdio.h> | 31 #include <stdio.h> |
| 32 |
| 33 #include <functional> |
32 #include <string> | 34 #include <string> |
33 | 35 |
34 #include "base/base_export.h" | 36 #include "base/base_export.h" |
35 #include "build/build_config.h" | 37 #include "build/build_config.h" |
36 | 38 |
37 #if defined(WCHAR_T_IS_UTF16) | 39 #if defined(WCHAR_T_IS_UTF16) |
38 | 40 |
39 namespace base { | 41 namespace base { |
40 | 42 |
41 typedef wchar_t char16; | 43 typedef wchar_t char16; |
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175 // in which the linker does not fully coalesce symbols when dead code | 177 // in which the linker does not fully coalesce symbols when dead code |
176 // stripping is enabled. This bug causes the memory errors described above | 178 // stripping is enabled. This bug causes the memory errors described above |
177 // to occur even when a std::basic_string<> does not cross shared library | 179 // to occur even when a std::basic_string<> does not cross shared library |
178 // boundaries, such as in statically-linked executables. | 180 // boundaries, such as in statically-linked executables. |
179 // | 181 // |
180 // TODO(mark): File this bug with Apple and update this note with a bug number. | 182 // TODO(mark): File this bug with Apple and update this note with a bug number. |
181 | 183 |
182 extern template | 184 extern template |
183 class BASE_EXPORT std::basic_string<base::char16, base::string16_char_traits>; | 185 class BASE_EXPORT std::basic_string<base::char16, base::string16_char_traits>; |
184 | 186 |
| 187 // Specialize std::hash for base::string16. Although the style guide forbids |
| 188 // this in general, it is necessary for consistency with WCHAR_T_IS_UTF16 |
| 189 // platforms, where base::string16 is a type alias for std::wstring. |
| 190 namespace std { |
| 191 template <> |
| 192 struct hash<base::string16> { |
| 193 std::size_t operator()(const base::string16& s) const { |
| 194 std::size_t result = 0; |
| 195 for (base::char16 c : s) |
| 196 result = (result * 131) + c; |
| 197 return result; |
| 198 } |
| 199 }; |
| 200 } // namespace std |
| 201 |
185 #endif // WCHAR_T_IS_UTF32 | 202 #endif // WCHAR_T_IS_UTF32 |
186 | 203 |
187 #endif // BASE_STRINGS_STRING16_H_ | 204 #endif // BASE_STRINGS_STRING16_H_ |
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