1 /** 2 * Copyright 2021 Huawei Technologies Co., Ltd 3 * 4 * Licensed under the Apache License, Version 2.0 (the "License"); 5 * you may not use this file except in compliance with the License. 6 * You may obtain a copy of the License at 7 * 8 * http://www.apache.org/licenses/LICENSE-2.0 9 * 10 * Unless required by applicable law or agreed to in writing, software 11 * distributed under the License is distributed on an "AS IS" BASIS, 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 * See the License for the specific language governing permissions and 14 * limitations under the License. 15 */ 16 17 #ifndef MINDSPORE_CORE_UTILS_SINGLETON_H_ 18 #define MINDSPORE_CORE_UTILS_SINGLETON_H_ 19 20 namespace mindspore { 21 template <typename T> 22 class Singleton { 23 public: 24 explicit Singleton(T &&) = delete; 25 explicit Singleton(const T &) = delete; 26 void operator=(const T &) = delete; 27 // thread safety implement 28 template <typename... _Args> Instance(_Args...args)29 static T &Instance(_Args... args) { 30 static T instance(args...); 31 return instance; 32 } 33 34 protected: 35 Singleton() = default; 36 virtual ~Singleton() = default; 37 }; 38 } // namespace mindspore 39 #endif // MINDSPORE_CORE_UTILS_SINGLETON_H_ 40