DelayedDestruction.h

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/*
 * Copyright 2014-present Facebook, 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.
 */

#pragma once

#include <folly/io/async/DelayedDestructionBase.h>

#include <glog/logging.h>

namespace folly {

class DelayedDestruction : public DelayedDestructionBase {
 public:
  virtual void destroy() {
    // If guardCount_ is not 0, just set destroyPending_ to delay
    // actual destruction.
    if (getDestructorGuardCount() != 0) {
      destroyPending_ = true;
    } else {
      onDelayedDestroy(false);
    }
  }

  class Destructor {
   public:
    void operator()(DelayedDestruction* dd) const {
      dd->destroy();
    }
  };

  bool getDestroyPending() const {
    return destroyPending_;
  }

 protected:
  ~DelayedDestruction() override = default;

  DelayedDestruction() : destroyPending_(false) {}

 private:
  bool destroyPending_;

  void onDelayedDestroy(bool delayed) override {
    // check if it is ok to destroy now
    if (delayed && !destroyPending_) {
      return;
    }
    destroyPending_ = false;
    delete this;
  }
};
} // namespace folly