83      * @param int $flag
86     public function addFlag(int $flag): void  argument
88         $this->flags |= $flag;
94      * @param int $flag
97     public function hasFlag(int $flag): bool  argument
99         return ($this->flags & $flag) === $flag;
105      * @param int $flag
108     public function hasNotFlag(int $flag): bool  argument
110         return ($this->flags & $flag) !== $flag;
116      * @param int $flag
119     public function removeFlag(int $flag): void  argument
121         $this->flags &= ~$flag;