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Partial implementation of derived classes using the old form with "@" files.
author rtshort@smoketree.phaselocked.com
date Tue, 24 Mar 2009 11:29:53 -0400
parents eb63fbe60fab
children 5579998f8acf
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eb63fbe60fab update copyright notices
John W. Eaton <jwe@octave.org>
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1 ## Copyright (C) 2004, 2005, 2007, 2008 John W. Eaton
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2 ##
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3 ## This file is part of Octave.
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4 ##
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5 ## Octave is free software; you can redistribute it and/or modify it
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6 ## under the terms of the GNU General Public License as published by
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7 ## the Free Software Foundation; either version 3 of the License, or (at
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8 ## your option) any later version.
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9 ##
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10 ## Octave is distributed in the hope that it will be useful, but
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11 ## WITHOUT ANY WARRANTY; without even the implied warranty of
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12 ## MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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13 ## General Public License for more details.
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14 ##
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15 ## You should have received a copy of the GNU General Public License
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16 ## along with Octave; see the file COPYING. If not, see
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17 ## <http://www.gnu.org/licenses/>.
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18
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19 ## -*- texinfo -*-
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20 ## @deftypefn {Function File} {} isa (@var{x}, @var{class})
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21 ## Return true if @var{x} is a value from the class @var{class}.
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22 ## @end deftypefn
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23
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24 ## Author: Paul Kienzle <pkienzle@users.sf.net>
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25 ## Adapted-by: jwe
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26
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27 function retval = isa (x, cname)
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28
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29 if (nargin != 2)
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30 print_usage ();
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31 endif
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32
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33 persistent float_classes = {"double", "single"};
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34
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35 persistent fnum_classes = {"double", "single", ...
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36 "uint8", "uint16", "uint32", "uint64", ...
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37 "int8", "int16", "int32", "int64"};
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38
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39 if (strcmp (cname, "float"))
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40 retval = any (strcmp (class (x), float_classes));
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41 elseif (strcmp (cname, "numeric"))
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42 retval = any (strcmp (class (x), fnum_classes));
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43 else
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44 class_of_x = class (x);
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45 retval = strcmp (class_of_x, cname);
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46 if (! retval && isobject (x))
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47 parent_classes_of_x = __parent_classes__ (x);
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48 if (! isempty (parent_classes_of_x))
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49 retval = any (strcmp (parent_classes_of_x, cname));
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50 endif
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51 endif
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52 endif
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53
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54 endfunction
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55
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56 %!assert (isa ("char", "float"), false)
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57 %!assert (isa (double (13), "float"), true)
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58 %!assert (isa (single (13), "float"), true)
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59 %!assert (isa (int8 (13), "float"), false)
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60 %!assert (isa (int16 (13), "float"), false)
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61 %!assert (isa (int32 (13), "float"), false)
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62 %!assert (isa (int64 (13), "float"), false)
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63 %!assert (isa (uint8 (13), "float"), false)
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64 %!assert (isa (uint16 (13), "float"), false)
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65 %!assert (isa (uint32 (13), "float"), false)
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66 %!assert (isa (uint64 (13), "float"), false)
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67 %!assert (isa ("char", "numeric"), false)
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68 %!assert (isa (double (13), "numeric"), true)
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69 %!assert (isa (single (13), "numeric"), true)
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70 %!assert (isa (int8 (13), "numeric"), true)
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71 %!assert (isa (int16 (13), "numeric"), true)
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72 %!assert (isa (int32 (13), "numeric"), true)
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73 %!assert (isa (int64 (13), "numeric"), true)
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74 %!assert (isa (uint8 (13), "numeric"), true)
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75 %!assert (isa (uint16 (13), "numeric"), true)
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76 %!assert (isa (uint32 (13), "numeric"), true)
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77 %!assert (isa (uint64 (13), "numeric"), true)