| // Copyright 2015 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_ENABLE_IF_H_ |
| #define COBALT_BASE_ENABLE_IF_H_ |
| |
| namespace base { |
| |
| // These classes are used to implement std::enable_if, which is available |
| // only in C++11. |
| // See http://en.cppreference.com/w/cpp/types/enable_if for documentation. |
| template <bool B, class T = void> |
| struct enable_if {}; |
| |
| template <class T> |
| struct enable_if<true, T> { |
| typedef T type; |
| }; |
| |
| } // namespace base |
| |
| #endif // COBALT_BASE_ENABLE_IF_H_ |
