| // Copyright 2014 The Cobalt Authors. 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_BASE_POLYMORPHIC_DOWNCAST_H_ |
| #define COBALT_BASE_POLYMORPHIC_DOWNCAST_H_ |
| |
| #include "base/logging.h" |
| |
| namespace base { |
| |
| // This function is designed to model the behavior of polymorphic_downcast from |
| // http://www.boost.org/doc/libs/1_56_0/libs/conversion/cast.htm |
| |
| template <typename Derived, typename Base> |
| Derived polymorphic_downcast(Base base) { |
| #if defined(COBALT_BUILD_TYPE_DEBUG) || defined(COBALT_BUILD_TYPE_DEVEL) |
| DCHECK(dynamic_cast<Derived>(base) == base); |
| #endif |
| return static_cast<Derived>(base); |
| } |
| |
| } // namespace base |
| |
| #endif // COBALT_BASE_POLYMORPHIC_DOWNCAST_H_ |
