; -----------------------------------------------------------------------------
;
;  Copyright (C) 1997-2008  Krzysztof M. Gorski, Eric Hivon, Anthony J. Banday
;
;
;
;
;
;  This file is part of HEALPix.
;
;  HEALPix is free software; you can redistribute it and/or modify
;  it under the terms of the GNU General Public License as published by
;  the Free Software Foundation; either version 2 of the License, or
;  (at your option) any later version.
;
;  HEALPix is distributed in the hope that it will be useful,
;  but WITHOUT ANY WARRANTY; without even the implied warranty of
;  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
;  GNU General Public License for more details.
;
;  You should have received a copy of the GNU General Public License
;  along with HEALPix; if not, write to the Free Software
;  Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
;
;  For more information about HEALPix see http://healpix.jpl.nasa.gov
;
; -----------------------------------------------------------------------------
function defined,var
;+
;  def = DEFINED(var)
;
;    the result of the function is 1 if var is defined and 0 otherwise
;
;-
   s = size(var)
   ndim = s(0)
   if s(1+ndim) eq 0 then return, 0

   return,1
end