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annotate src/ov-null-mat.cc @ 8150:283989f2da9b

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make null assignment matlab compatible
author Jaroslav Hajek <highegg@gmail.com>
date Fri, 26 Sep 2008 11:52:01 -0400
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children c777f3ce02d8
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8150
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1 /*
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2
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3 Copyright (C) 2008 Jaroslav Hajek
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4
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5 This file is part of Octave.
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6
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7 Octave is free software; you can redistribute it and/or modify it
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8 under the terms of the GNU General Public License as published by the
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9 Free Software Foundation; either version 3 of the License, or (at your
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10 option) any later version.
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11
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12 Octave is distributed in the hope that it will be useful, but WITHOUT
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13 ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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14 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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15 for more details.
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16
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17 You should have received a copy of the GNU General Public License
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18 along with Octave; see the file COPYING. If not, see
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19 <http://www.gnu.org/licenses/>.
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20
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21 */
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22
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23 #ifdef HAVE_CONFIG_H
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24 #include <config.h>
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25 #endif
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26
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27 #include "ov-null-mat.h"
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28 #include "ops.h"
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29 #include "defun.h"
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30
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31 DEFINE_OV_TYPEID_FUNCTIONS_AND_DATA (octave_null_matrix, "null_matrix", "double");
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32
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33 const octave_value octave_null_matrix::instance (new octave_null_matrix ());
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34
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35 static octave_base_value *
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36 default_null_matrix_numeric_conversion_function (const octave_base_value& a)
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37 {
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38 CAST_CONV_ARG (const octave_null_matrix&);
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39
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40 return a.empty_clone ();
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41 }
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42
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43 octave_base_value::type_conv_fcn
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44 octave_null_matrix::numeric_conversion_function (void) const
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45 {
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46 return default_null_matrix_numeric_conversion_function;
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47 }
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48
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49 DEFINE_OV_TYPEID_FUNCTIONS_AND_DATA (octave_null_str, "null_string", "char");
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50
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51 const octave_value octave_null_str::instance (new octave_null_str ());
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52
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53 static octave_base_value *
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54 default_null_str_numeric_conversion_function (const octave_base_value& a)
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55 {
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56 CAST_CONV_ARG (const octave_null_str&);
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57
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58 return a.empty_clone ();
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59 }
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60
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61 octave_base_value::type_conv_fcn
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62 octave_null_str::numeric_conversion_function (void) const
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63 {
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64 return default_null_str_numeric_conversion_function;
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65 }
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66
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67 DEFINE_OV_TYPEID_FUNCTIONS_AND_DATA (octave_null_sq_str, "null_sq_string", "char");
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68
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69 const octave_value octave_null_sq_str::instance (new octave_null_sq_str ());
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70
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71 static octave_base_value *
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72 default_null_sq_str_numeric_conversion_function (const octave_base_value& a)
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73 {
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74 CAST_CONV_ARG (const octave_null_sq_str&);
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75
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76 return a.empty_clone ();
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77 }
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78
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79 octave_base_value::type_conv_fcn
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80 octave_null_sq_str::numeric_conversion_function (void) const
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81 {
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82 return default_null_sq_str_numeric_conversion_function;
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83 }
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84
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85 DEFUN (isnull, args, ,
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86 "-*- texinfo -*-\n\
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87 @deftypefn {Built-in Function} {} isnull (@var{x})\n\
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88 Return 1 if @var{x} is a special null matrix, string or single quoted string.\n\
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89 Indexed assignment with such a value as right-hand side should delete array elements.\n\
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90 This function should be used when overloading indexed assignment for user-defined \n\
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91 classes instead of @code{isempty}, to distinguish the cases:\n\
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92 @table @asis\n\
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93 @item @code{A(I) = []}\n\
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94 This should delete elements if @code{I} is nonempty.\n\
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95 @item @code{X = []; A(I) = X}\n\
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96 This should give an error if @code{I} is nonempty.\n\
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97 @end table\n\
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98 @end deftypefn")
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99 {
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100 octave_value retval;
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101
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102 int nargin = args.length ();
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103
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104 if (nargin == 1 && args(0).is_defined ())
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105 retval = args(0).is_null_value ();
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106 else
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107 print_usage ();
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108
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109 return retval;
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110 }
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111