| // Copyright 2011 Google Inc. |
| // |
| // 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. |
| // |
| // Author: jmaessen@google.com (Jan Maessen) |
| |
| #ifndef PAGESPEED_KERNEL_BASE_POOL_ELEMENT_H_ |
| #define PAGESPEED_KERNEL_BASE_POOL_ELEMENT_H_ |
| |
| #include <list> |
| |
| // Include this file when defining an object that will reside in a pool. There |
| // are a couple of ways of defining such an object, but all of them require us |
| // to use the PoolPosition typedef. Most simply, we can extend the PoolElement |
| // type defined here---but in practice, we want to avoid multiple inheritance |
| // just to store a simple back link, and we're better off providing an accessor |
| // at pool construction time instead. |
| namespace net_instaweb { |
| |
| template<class T> |
| class PoolElement { |
| public: |
| typedef typename std::list<T*>::iterator Position; |
| |
| PoolElement() { } |
| |
| // Returns a pointer to a mutable location holding the position of |
| // the element in any containing pool. |
| Position* pool_position() { return &pool_position_; } |
| |
| private: |
| Position pool_position_; |
| |
| DISALLOW_COPY_AND_ASSIGN(PoolElement); |
| }; |
| |
| } // namespace net_instaweb |
| |
| #endif // PAGESPEED_KERNEL_BASE_POOL_ELEMENT_H_ |