CWeakPtr.h

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// -*- c++ -*-
//*****************************************************************************
//*****************************************************************************

#ifndef polybori_CWeakPtr_h_
#define polybori_CWeakPtr_h_

// include basic definitions
#include <polybori/pbori_defs.h>
#include "CWeakPtrFacade.h"

BEGIN_NAMESPACE_PBORI

template <class ValueType>
class CWeakPtr {

  typedef CWeakPtr self;

public:
  typedef ValueType value_type;

  typedef value_type* data_type;
  typedef boost::shared_ptr<data_type> ptr_type;


  explicit CWeakPtr(const CWeakPtrFacade<ValueType>& val):
    m_data(val.m_data) { PBORI_ASSERT(m_data);}

  CWeakPtr(const self& rhs): m_data(rhs.m_data) {}

  ~CWeakPtr() {}

  const value_type& operator*() const {
    return *(operator->()); 
  }

  value_type* operator->() const {
    if (!*m_data)
      throw std::runtime_error("Outdated weak pointer dereferenced.");

    return (*m_data);
  }
  operator bool() const { return *m_data; }

private:
  ptr_type m_data;
};

END_NAMESPACE_PBORI

#endif /* polybori_CWeakPtr_h_ */

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