package Ġcom . gy org yz olt an . sp ray App . domain . tutorial Ċ Ċ import Ġcom . gy org yz olt an . sp ray App . repository . repository . tutorial . Tutorial Repository Ċ Ċ class ĠHas Seen Tutorial UseCase ( ĊĠĠĠ Ġprivate Ġval Ġtutorial Repository : ĠTutorial Repository Ċ ) Ġ{ ĊĠĠĠ Ġoperator Ġfun Ġinvoke () Ġ= Ġtutorial Repository . has Seen Tutorial Ċ }