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#ifndef ADC_CPP_SUB_PE_HXX
#define ADC_CPP_SUB_PE_HXX



// USED SERVICES
    // BASE CLASSES
    // COMPONENTS
    // PARAMETERS


class ParseEnvironment;

template <class PE, class SUB>
class SubPe
{
  public:
    typedef SubPe< PE, SUB >    self;

                        SubPe(
                            PE &                i_rParent );
    PE &                Parent() const;
    SUB &               Child() const;

    ParseEnvironment &  Get() const;

  private:
    SUB &               CreateChild() const;

    PE &                rParent;
    Dyn<SUB>            pChild;
};



// IMPLEMENTATION


//  SubPe

template <class PE, class SUB>
SubPe<PE,SUB>::SubPe( PE & i_rParent )
    :   rParent(i_rParent)
{
}

template <class PE, class SUB>
PE &
SubPe<PE,SUB>::Parent() const
{
     return rParent;
}

template <class PE, class SUB>
inline SUB &
SubPe<PE,SUB>::Child() const
{
    return pChild ? *pChild.MutablePtr() : CreateChild();
}

template <class PE, class SUB>
ParseEnvironment &
SubPe<PE,SUB>::Get() const
{
    return Child();
}

template <class PE, class SUB>
SUB &
SubPe<PE,SUB>::CreateChild() const
{
    self * pThis = const_cast< self* >(this);

    SUB * pNewChild = new SUB( &rParent);

    pThis->pChild = pNewChild;

    return *pChild.MutablePtr();
}




#endif

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