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/* -*- C++ -*- */
// $Id$
#if !defined(DATAELEMENT_H)
#define DATAELEMENT_H
class DataElementEx;
// Listing 1 code/ch05
// A simple data element class.
class DataElement
{
friend class DataElementEx;
public:
DataElement () : data_ (0) { count_++; }
DataElement (int data) : data_(data) { count_++; }
DataElement (const DataElement& e)
{
data_ = e.getData ();
count_++;
}
DataElement & operator= (const DataElement& e)
{
data_ = e.getData ();
return *this;
}
bool operator== (const DataElement& e)
{ return this->data_ == e.data_; }
~DataElement () { count_--; }
int getData (void) const { return data_; }
void setData (int val) { data_ = val; }
static int numOfActiveObjects (void) { return count_; }
private:
int data_;
static int count_;
};
// Listing 1
int DataElement::count_ = 0;
#endif /*DATAELEMENT_H*/
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