## Copyright (C) 2004-2012 John W. Eaton
##
## 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} {} isa (@var{obj}, @var{classname})
## Return true if @var{obj} is an object from the class @var{classname}.
##
## @var{classname} may also be one of the following class categories: 
##
## @table @asis
## @item "float"
## Floating point value comprising classes "double" and "single".
##
## @item "integer"
## Integer value comprising classes (u)int8, (u)int16, (u)int32, (u)int64.
##
## @item "numeric"
## Numeric value comprising either a floating point or integer value.
## @end table
## @seealso{class, typeinfo}
## @end deftypefn

## Author: Paul Kienzle <pkienzle@users.sf.net>
## Adapted-by: jwe

function retval = isa (obj, classname)

  if (nargin != 2)
    print_usage ();
  endif

  if (strcmp (classname, "float"))
    retval = isfloat (obj);
  elseif (strcmp (classname, "integer"))
    retval = isinteger (obj);
  elseif (strcmp (classname, "numeric"))
    retval = isnumeric (obj);
  else
    class_of_obj = class (obj);
    retval = strcmp (class_of_obj, classname);
    if (! retval && isobject (obj))
      retval = __isa_parent__ (obj, classname);
    endif
  endif

endfunction


%!assert (isa ("char", "float"), false)
%!assert (isa (logical (1), "float"), false)
%!assert (isa (double (13), "float"), true)
%!assert (isa (single (13), "float"), true)
%!assert (isa (int8 (13), "float"), false)
%!assert (isa (int16 (13), "float"), false)
%!assert (isa (int32 (13), "float"), false)
%!assert (isa (int64 (13), "float"), false)
%!assert (isa (uint8 (13), "float"), false)
%!assert (isa (uint16 (13), "float"), false)
%!assert (isa (uint32 (13), "float"), false)
%!assert (isa (uint64 (13), "float"), false)
%!assert (isa ("char", "numeric"), false)
%!assert (isa (logical (1), "numeric"), false)
%!assert (isa (double (13), "numeric"), true)
%!assert (isa (single (13), "numeric"), true)
%!assert (isa (int8 (13), "numeric"), true)
%!assert (isa (int16 (13), "numeric"), true)
%!assert (isa (int32 (13), "numeric"), true)
%!assert (isa (int64 (13), "numeric"), true)
%!assert (isa (uint8 (13), "numeric"), true)
%!assert (isa (uint16 (13), "numeric"), true)
%!assert (isa (uint32 (13), "numeric"), true)
%!assert (isa (uint64 (13), "numeric"), true)
%!assert (isa (uint8 (13), "integer"), true)
%!assert (isa (double (13), "integer"), false)
%!assert (isa (single (13), "integer"), false)

%!assert (isa (double (13), "double"))
%!assert (isa (single (13), "single"))
%!assert (isa (int8 (13), "int8"))
%!assert (isa (int16 (13), "int16"))
%!assert (isa (int32 (13), "int32"))
%!assert (isa (int64 (13), "int64"))
%!assert (isa (uint8 (13), "uint8"))
%!assert (isa (uint16 (13), "uint16"))
%!assert (isa (uint32 (13), "uint32"))
%!assert (isa (uint64 (13), "uint64"))
%!assert (isa ("string", "char"))
%!assert (isa (true, "logical"))
%!assert (isa (false, "logical"))
%!assert (isa ({1, 2}, "cell"))
%!test
%! a.b = 1;
%! assert (isa (a, "struct"));