@interface VFPriorityDesignator : NSObject @property (class, readonly, retain) VFPriorityDesignator *currentDesignator; @property (nonatomic) unsigned long long priority; + (id)currentDesignatorStack; + (id)installNewDesignator; + (id)currentDesignatorStackIfExists; + (id)currentDesignatorIfExists; + (id)pushNewDesignator; + (void)destroyCurrentDesignator; @end