pub(crate) fn is_member(&self, x: &C::NodeId) -> bool {
        for c in self.configs.iter() {
            if c.contains(x) {
                return true;
            }
        }
        false
    }
/// Check if the given `NodeId` exists in this membership config.
Check if the given `NodeId` exists in this membership config.
Check if the given ` NodeId ` exists in this membership config .
pub(crate) fn is_member(&self, x: &C::NodeId) -> bool {
        for c in self.configs.iter() {
            if c.contains(x) {
                return true;
            }
        }
        false
    }
pub ( crate ) fn is_member ( & self , x : & C :: NodeId ) -> bool { for c in self . configs . iter ( ) { if c . contains ( x ) { return true ; } } false }
Check if the given `NodeId` exists in this membership config.
Check if the given ` NodeId ` exists in this membership config .
&self
x
&C::NodeId