; -----------------------------------------------------------------------------
;
;  Copyright (C) 1997-2013  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.sourceforge.net
;
; -----------------------------------------------------------------------------
function is_idl, help=help
;+
;   flag = is_idl( [/HELP] )
;
;   flag will take value 1 if genuine IDL is being run
;   and 0 otherwise
;
;   See also  is_gdl() and is_fl()

;   2017-06-13
;
;-

routine = 'is_idl'
if keyword_set(help) then begin
    doc_library,routine
    return,-1
endif

flag = ~(is_gdl() || is_fl())

return, flag
end