void deleteMember(final TypeMember member){
  members.remove(Preconditions.checkNotNull(member,"Error: member argument can not be null."));
}

void deleteMember ( final TypeMember member ) { members . remove ( Preconditions . checkNotNull ( member , "Error: member argument can not be null." ) ) ; }
deletes a member from the list of members . this function removes the member without moving subsequent members and doesn ' t update the size of this type .
