// Copyright (c) 2010 The Chromium Authors. All rights reserved. // Use of this source code is governed by a BSD-style license that can be // found in the LICENSE file. #ifndef BUTIL_STRINGS_NULLABLE_STRING16_H_ #define BUTIL_STRINGS_NULLABLE_STRING16_H_ #include <iosfwd> #include "butil/base_export.h" #include "butil/strings/string16.h" namespace butil { // This class is a simple wrapper for string16 which also contains a null // state. This should be used only where the difference between null and // empty is meaningful. class NullableString16 { public: NullableString16() : is_null_(true) { } NullableString16(const string16& string, bool is_null) : string_(string), is_null_(is_null) { } const string16& string() const { return string_; } bool is_null() const { return is_null_; } private: string16 string_; bool is_null_; }; inline bool operator==(const NullableString16& a, const NullableString16& b) { return a.is_null() == b.is_null() && a.string() == b.string(); } inline bool operator!=(const NullableString16& a, const NullableString16& b) { return !(a == b); } BUTIL_EXPORT std::ostream& operator<<(std::ostream& out, const NullableString16& value); } // namespace #endif // BUTIL_STRINGS_NULLABLE_STRING16_H_