CheckedPointer.h

// -*- tab-width: 2; indent-tabs-mode: nil; coding: utf-8-with-signature -*-
//-----------------------------------------------------------------------------
// Copyright 2000-2022 CEA (www.cea.fr) IFPEN (www.ifpenergiesnouvelles.com)
// See the top-level COPYRIGHT file for details.
// SPDX-License-Identifier: Apache-2.0
//-----------------------------------------------------------------------------
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/* CheckedPointer.h                                            (C) 2000-2023 */
/*                                                                           */
/* Classes encapsulant un pointeur permettant de vérifier l'utilisation.     */
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#ifndef ARCCORE_BASE_CHECKEDPOINTER_H
#define ARCCORE_BASE_CHECKEDPOINTER_H
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#include "arccore/base/ArccoreGlobal.h"
 
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namespace Arccore
{
 
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template<class T>
class CheckedPointer
{
 protected:
 
  const CheckedPointer<T>& operator=(const CheckedPointer<T>& from)
  {
    m_value = from.m_value;
    return (*this);
  }
  
  template <typename T2>
  const CheckedPointer<T>& operator=(const CheckedPointer<T2>& from)
  {
    m_value = from.get();
    return (*this);
  }
 
 
  const CheckedPointer<T>& operator=(T* new_value)
  {
    m_value = new_value; return (*this);
  }
 
  CheckedPointer(const CheckedPointer<T>& from) : m_value(from.m_value) {}
 
  template <typename T2>
  CheckedPointer(const CheckedPointer<T2>& from) : m_value(from.m_value) {}
 
 public:
 
  CheckedPointer() : m_value(nullptr) {}
 
  explicit CheckedPointer(T* t) : m_value(t) {}
 
 public:
  explicit operator bool() const { return get()!=nullptr; }
 public:
  
  inline T* operator->() const
    {
#ifdef ARCCORE_CHECK
      if (!m_value)
        arccoreNullPointerError();
#endif
      return m_value;
    }
 
  inline T& operator*() const
    {
#ifdef ARCCORE_CHECK
      if (!m_value)
        arccoreNullPointerError();
#endif
      return *m_value;
    }
 
  inline T* get() const
  {
    return m_value;
  }
 
  inline bool isNull() const
  {
    return (!m_value);
  }
 
 
  template<typename T2> friend bool
  operator==(const CheckedPointer<T>& v1,const CheckedPointer<T2>& v2)
  {
    return v1.get() == v2.get();
  }
 
  template<typename T2> friend bool
  operator!=(const CheckedPointer<T>& v1,const CheckedPointer<T2>& v2)
  {
    return v1.get() != v2.get();
  }
 
 protected:
  
  T* m_value; 
};
 
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} // End namespace Arccore
 
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#endif