The C++ transformation converts Platform-Independent Model (PIM) element types to C++ specific Class element types and creates encapsulation (producing the getters and setters) according to the options you have set for creating properties from C++ attributes (on the 'C++ Specifications' page of the 'Preferences' dialog). Note that the public attributes in the PIM are converted to private attributes in the PSM. All operations on an interface are transformed into pure virtual methods on an equivalent class.
The PIM elements
After transformation, become the PSM elements