private static void InternalVisibilityApproach()
{
Console.WriteLine("Internal Visibility Approach");
SpeedometerInternalVisibility speedo = new SpeedometerInternalVisibility();
speedo.CurrentSpeed = 50;
speedo.CurrentSpeed = 100;
Console.WriteLine("Current speed: " + speedo.CurrentSpeed);
Console.WriteLine("Previous speed: " + speedo.previousSpeed);
// Save the state of 'speedo'
SpeedometerMementoInternalVisibility memento = new SpeedometerMementoInternalVisibility(speedo);
// Change the state of 'speed'
speedo.CurrentSpeed = 80;
Console.WriteLine("After setting to 80...");
Console.WriteLine("Current speed: " + speedo.CurrentSpeed);
Console.WriteLine("Previous speed: " + speedo.previousSpeed);
// Restore the state of 'speedo'
Console.WriteLine("Now restoring state...");
memento.RestoreState();
Console.WriteLine("Current speed: " + speedo.CurrentSpeed);
Console.WriteLine("Previous speed: " + speedo.previousSpeed);
}
public SpeedometerMementoInternalVisibility(SpeedometerInternalVisibility speedometer)
{
this.speedometer = speedometer;
copyOfCurrentSpeed = speedometer.CurrentSpeed;
copyOfPreviousSpeed = speedometer.previousSpeed;
}