autonuller.h

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// Copyright 2020 The PDFium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
 
#ifndef CORE_FXCRT_AUTONULLER_H_
#define CORE_FXCRT_AUTONULLER_H_
 
#include "core/fxcrt/fx_memory.h"
#include "core/fxcrt/unowned_ptr.h"
 
namespace fxcrt {
 
template <typename T>
class AutoNuller {
 public:
  FX_STACK_ALLOCATED();
 
  explicit AutoNuller(T* location) : m_Location(location) {}
  ~AutoNuller() {
    if (m_Location)
      *m_Location = nullptr;
  }
  void AbandonNullification() { m_Location = nullptr; }
 
 private:
  UnownedPtr<T> m_Location;
};
 
}  // namespace fxcrt
 
using fxcrt::AutoNuller;
 
#endif  // CORE_FXCRT_AUTONULLER_H_