/**
 * Copyright 2021 Huawei Technologies Co., Ltd
 *
 * 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 HD18A3E42_2801_4BEB_B365_03633D1D81C4
#define HD18A3E42_2801_4BEB_B365_03633D1D81C4

#include "easy_graph/eg.h"

EG_NS_BEGIN

template<typename T>
struct Singleton {
  static T &GetInstance() {
    static T instance;
    return instance;
  }

  Singleton(const Singleton &) = delete;
  Singleton &operator=(const Singleton &) = delete;

 protected:
  Singleton() {}
};

#define SINGLETON(object) struct object : ::EG_NS::Singleton<object>

EG_NS_END

#endif
