// Fig. 10.25: Interface.h
// Header file for class Interface
// Client sees this source code, but the source code does not reveal 
// the data layout of class Implementation.

class Implementation; // forward class declaration required by line 17

class Interface 
{
public:
   Interface( int ); // constructor
   void setValue( int ); // same public interface as
   int getValue() const; // class Implementation has
   ~Interface(); // destructor
private:
   // requires previous forward declaration (line 6)
   Implementation *ptr;   
}; // end class Interface

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