| /* |
| * Copyright 2014 Google Inc. All Rights Reserved. |
| * |
| * Licensed under the Apache License, Version 2.0 (the "License"); |
| * you may not use this file except in compliance with the License. |
| * You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, software |
| * distributed under the License is distributed on an "AS IS" BASIS, |
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| * See the License for the specific language governing permissions and |
| * limitations under the License. |
| */ |
| |
| #ifndef COBALT_CSSOM_PROPERTY_VALUE_H_ |
| #define COBALT_CSSOM_PROPERTY_VALUE_H_ |
| |
| #include <string> |
| |
| #include "base/memory/ref_counted.h" |
| #include "cobalt/base/polymorphic_equatable.h" |
| |
| namespace cobalt { |
| namespace cssom { |
| |
| class PropertyValueVisitor; |
| |
| // A base type for all values of CSS properties. |
| // All derived classes must be immutable. |
| class PropertyValue : public base::RefCountedThreadSafe<PropertyValue>, |
| public base::PolymorphicEquatable { |
| public: |
| virtual void Accept(PropertyValueVisitor* visitor) = 0; |
| |
| virtual std::string ToString() const = 0; |
| |
| protected: |
| virtual ~PropertyValue() {} |
| |
| friend class base::RefCountedThreadSafe<PropertyValue>; |
| }; |
| |
| } // namespace cssom |
| } // namespace cobalt |
| |
| #endif // COBALT_CSSOM_PROPERTY_VALUE_H_ |