#include <iostream.h>

class IntCell

{

public:

explicit IntCell( int initialValue = 0 );

IntCell( const IntCell & rhs );

~IntCell( );

const IntCell & operator=( const IntCell & rhs );

int read( ) const;

void write( int x );

private:

int *storedValue;

};

IntCell::IntCell( int initialValue )

{

storedValue = new int( initialValue );

}

IntCell::IntCell( const IntCell & rhs )

{

storedValue = new int( *rhs.storedValue );

}

IntCell::~IntCell( )

{

delete storedValue;

}

const IntCell & IntCell::operator=( const IntCell & rhs )

{

if( this != &rhs )

*storedValue = *rhs.storedValue;

return *this;

}

int IntCell::read( ) const

{

return *storedValue;

}

void IntCell::write( int x )

{

*storedValue = x;

}

/*

* Figure 1.15.

*/

int f( )

{

IntCell a( 2 );

IntCell b = a;

IntCell c;

c = b;

a.write( 4 );

cout << a.read( ) << endl << b.read( ) << endl << c.read( ) << endl;

return 0;

}

int main( )

{

f( );

return 0;

}