interface.cpp

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// Fig. 10.26: Interface.cpp
// Implementation of class Interface--client receives this file only 
// as precompiled object code, keeping the implementation hidden.
#include "Interface.h" // Interface class definition
#include "Implementation.h" // Implementation class definition

// constructor
Interface::Interface( int v ) 
   : ptr ( new Implementation( v ) ) // initialize ptr to point to
{                                    // a new Implementation object
   // empty body
} // end Interface constructor

// call Implementation's setValue function
void Interface::setValue( int v ) 
{ 
   ptr->setValue( v ); 
} // end function setValue

// call Implementation's getValue function
int Interface::getValue() const 
{ 
   return ptr->getValue(); 
} // end function getValue

// destructor
Interface::~Interface() 
{ 
   delete ptr; 
} // end ~Interface destructor

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