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## Copyright (C) 2010-2013 Ben Abbott
##
## This file is part of Octave.
##
## Octave 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 3 of the License, or (at
## your option) any later version.
##
## Octave 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 Octave; see the file COPYING. If not, see
## <http://www.gnu.org/licenses/>.
## -*- texinfo -*-
## @deftypefn {Function File} {@var{res} =} isprop (@var{h}, "@var{prop}")
## Return true if @var{prop} is a property of the object with handle @var{h}.
##
## @var{h} may also be an array of handles in which case @var{res} will be a
## logical array indicating whether each handle has the property @var{prop}.
## @seealso{get, set, ismethod, isobject}
## @end deftypefn
## Author: Ben Abbott <bpabbott@mac.com>
function res = isprop (h, prop)
if (nargin != 2)
print_usage ();
endif
if (! all (ishandle (h)))
error ("isprop: H must be a graphics handle or vector of handles");
elseif (! ischar (prop))
error ("isprop: PROP name must be a string");
endif
res = false (size (h));
for i = 1:numel (res)
try
v = get (h(i), prop);
res(i) = true;
end_try_catch
endfor
endfunction
%!assert (isprop (0, "foobar"), false)
%!assert (isprop (0, "screenpixelsperinch"), true)
%!assert (isprop (zeros (2, 3), "visible"), true (2, 3))
%!error isprop ()
%!error isprop (1)
%!error isprop (1,2,3)
%!error <H must be a graphics handle> isprop ({1}, "visible")
%!error <PROP name must be a string> isprop (0, {"visible"})
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