utils/Observer.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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/* Observer.h                                                  (C) 2000-2021 */
/*                                                                           */
/* Observateur.                                                              */
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#ifndef ARCANE_UTILS_OBSERVER_H
#define ARCANE_UTILS_OBSERVER_H
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/*---------------------------------------------------------------------------*/
 
#include "arcane/utils/IObserver.h"
#include "arcane/utils/IObservable.h"
 
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namespace Arcane
{
 
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class ARCANE_UTILS_EXPORT AbstractObserver
: public IObserver
{
 public:
 
  AbstractObserver() : m_observable(nullptr) {}
  virtual ~AbstractObserver();
 
 public:
  
  void attachToObservable(IObservable* obs) override;

  void detach() override;
 
 private:
 
  IObservable* m_observable;
};
 
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template<class T>
class ObserverT
: public AbstractObserver
{
 public:
  
  typedef void (T::*Func0Ptr)(); 
  typedef void (T::*Func1Ptr)(const IObservable&); 
 
 public:
  
  ObserverT(T* object,Func1Ptr funcptr)
  : m_object(object), m_function0(nullptr), m_function1(funcptr) {}
  ObserverT(T* object,Func0Ptr funcptr)
  : m_object(object), m_function0(funcptr), m_function1(nullptr) {}
 
 public:
  
 
 public:

  void observerUpdate(IObservable* iob) override
  {
    if (m_function1)
      (m_object->*m_function1)(*iob);
    if (m_function0)
      (m_object->*m_function0)();
  }
 
 private:
 
  T* m_object;    
  Func0Ptr m_function0; 
  Func1Ptr m_function1; 
};
 
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} // End namespace Arcane
 
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#endif