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annotate libinterp/octave-value/ov-null-mat.h @ 27919:1891570abac8

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update Octave Project Developers copyright for the new year In files that have the "Octave Project Developers" copyright notice, update for 2020.
author John W. Eaton <jwe@octave.org>
date Mon, 06 Jan 2020 22:29:51 -0500
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1 /*
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2
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3 Copyright (C) 2008-2020 The Octave Project Developers
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4
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5 See the file COPYRIGHT.md in the top-level directory of this distribution
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6 or <https://octave.org/COPYRIGHT.html/>.
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7
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8
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9 This file is part of Octave.
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10
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11 Octave is free software: you can redistribute it and/or modify it
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12 under the terms of the GNU General Public License as published by
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13 the Free Software Foundation, either version 3 of the License, or
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14 (at your option) any later version.
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15
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16 Octave is distributed in the hope that it will be useful, but
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17 WITHOUT ANY WARRANTY; without even the implied warranty of
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18 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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19 GNU General Public License for more details.
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20
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21 You should have received a copy of the GNU General Public License
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22 along with Octave; see the file COPYING. If not, see
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23 <https://www.gnu.org/licenses/>.
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24
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25 */
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26
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27 #if ! defined (octave_ov_null_mat_h)
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28 #define octave_ov_null_mat_h 1
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29
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30 #include "octave-config.h"
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31
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32 #include "ov.h"
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33 #include "ov-re-mat.h"
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34 #include "ov-str-mat.h"
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35
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36 // Design rationale:
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37 // The constructors are hidden. There is only one null matrix (or null string)
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38 // object, that can have shallow copies. Cloning the object returns just a
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39 // normal empty matrix, so all the shallow copies are, in fact, read-only.
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40 // This conveniently ensures that any attempt to fiddle with the null matrix
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41 // destroys its special status.
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42
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43 // The special [] value.
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44
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45 class
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46 OCTINTERP_API
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47 octave_null_matrix : public octave_matrix
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48 {
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49 octave_null_matrix (void) : octave_matrix () { }
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50
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51 public:
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52
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53 static const octave_value instance;
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54
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55 bool isnull (void) const { return true; }
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56
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57 type_conv_info numeric_conversion_function (void) const;
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58
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59 private:
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60
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61 DECLARE_OV_TYPEID_FUNCTIONS_AND_DATA
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62 };
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63
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64 // The special "" value
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65
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66 class
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67 OCTINTERP_API
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68 octave_null_str : public octave_char_matrix_str
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69 {
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70 octave_null_str (void) : octave_char_matrix_str () { }
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72 public:
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73
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74 static const octave_value instance;
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75
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76 bool isnull (void) const { return true; }
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77
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78 type_conv_info numeric_conversion_function (void) const;
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79
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80 private:
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81
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82 DECLARE_OV_TYPEID_FUNCTIONS_AND_DATA
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83 };
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84
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85 // The special '' value
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86
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87 class
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88 OCTINTERP_API
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89 octave_null_sq_str : public octave_char_matrix_sq_str
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90 {
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91 octave_null_sq_str (void) : octave_char_matrix_sq_str () { }
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92
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93 public:
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94
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95 static const octave_value instance;
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96
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97 bool isnull (void) const { return true; }
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98
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99 type_conv_info numeric_conversion_function (void) const;
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100
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101 private:
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102
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103 DECLARE_OV_TYPEID_FUNCTIONS_AND_DATA
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104 };
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105
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106 #endif