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comparison: security/sandbox/chromium/base/strings/nullable_string16.h
security/sandbox/chromium/base/strings/nullable_string16.h
- changeset 2
- 7e26c7da4463
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| -1:000000000000 | 0:cdcf5e6005fa |
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| 1 // Copyright (c) 2010 The Chromium Authors. All rights reserved. | |
| 2 // Use of this source code is governed by a BSD-style license that can be | |
| 3 // found in the LICENSE file. | |
| 4 | |
| 5 #ifndef BASE_STRINGS_NULLABLE_STRING16_H_ | |
| 6 #define BASE_STRINGS_NULLABLE_STRING16_H_ | |
| 7 | |
| 8 #include <iosfwd> | |
| 9 | |
| 10 #include "base/base_export.h" | |
| 11 #include "base/strings/string16.h" | |
| 12 | |
| 13 namespace base { | |
| 14 | |
| 15 // This class is a simple wrapper for string16 which also contains a null | |
| 16 // state. This should be used only where the difference between null and | |
| 17 // empty is meaningful. | |
| 18 class NullableString16 { | |
| 19 public: | |
| 20 NullableString16() : is_null_(true) { } | |
| 21 NullableString16(const string16& string, bool is_null) | |
| 22 : string_(string), is_null_(is_null) { | |
| 23 } | |
| 24 | |
| 25 const string16& string() const { return string_; } | |
| 26 bool is_null() const { return is_null_; } | |
| 27 | |
| 28 private: | |
| 29 string16 string_; | |
| 30 bool is_null_; | |
| 31 }; | |
| 32 | |
| 33 inline bool operator==(const NullableString16& a, const NullableString16& b) { | |
| 34 return a.is_null() == b.is_null() && a.string() == b.string(); | |
| 35 } | |
| 36 | |
| 37 inline bool operator!=(const NullableString16& a, const NullableString16& b) { | |
| 38 return !(a == b); | |
| 39 } | |
| 40 | |
| 41 BASE_EXPORT std::ostream& operator<<(std::ostream& out, | |
| 42 const NullableString16& value); | |
| 43 | |
| 44 } // namespace | |
| 45 | |
| 46 #endif // BASE_STRINGS_NULLABLE_STRING16_H_ |
