| /************************************************************ |
| * |
| * Licensed to the Apache Software Foundation (ASF) under one |
| * or more contributor license agreements. See the NOTICE file |
| * distributed with this work for additional information |
| * regarding copyright ownership. The ASF licenses this file |
| * to you 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 SINGA_UTILS_SINGLETON_H_ |
| #define SINGA_UTILS_SINGLETON_H_ |
| |
| /// Thread-safe implementation for C++11 according to |
| // http://stackoverflow.com/questions/2576022/efficient-thread-safe-singleton-in-c |
| template<typename T> |
| class Singleton { |
| public: |
| static T* Instance() { |
| static T data_; |
| return &data_; |
| } |
| }; |
| |
| /// Thread Specific Singleton |
| /// Each thread will have its own data_ storage. |
| /* |
| template<typename T> |
| class TSingleton { |
| public: |
| static T* Instance() { |
| static thread_local T data_; // thread_local is not available in some |
| // compilers |
| return &data_; |
| } |
| }; |
| */ |
| |
| #endif // SINGA_UTILS_SINGLETON_H_ |