,-------------.           
|MyInterface  |  ,-------.
|-------------|  |Builder|
|+ GetValue() |  |-------|
`-------------'  `-------'
                          
                          
  ,----------------------.
  |Foo                   |
  |----------------------|
  |- field int           |
  |+ PublicField bool    |
  |- myPrivateFunction() |
  |+ GetValue()          |
  |+ MyPublicFunction()  |
  `----------------------'