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annotate libinterp/octave-value/ov-null-mat.h @ 19840:c5270263d466 gui-release

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author John W. Eaton <jwe@octave.org>
date Fri, 30 Jan 2015 17:41:50 -0500
parents ebb3ef964372
children 4197fc428c7d
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1 /*
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2
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3 Copyright (C) 2008-2013 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 #if !defined (octave_ov_null_mat_h)
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24 #define octave_ov_null_mat_h 1
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25
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26 #include "ov.h"
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27 #include "ov-re-mat.h"
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28 #include "ov-str-mat.h"
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29
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30 // Design rationale:
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31 // The constructors are hidden. There is only one null matrix (or null string)
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32 // object, that can have shallow copies. Cloning the object returns just a
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33 // normal empty matrix, so all the shallow copies are, in fact, read-only. This
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34 // conveniently ensures that any attempt to fiddle with the null matrix
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35 // destroys its special status.
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36
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37 // The special [] value.
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38
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39 class
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40 OCTINTERP_API
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41 octave_null_matrix : public octave_matrix
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42 {
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43 octave_null_matrix (void) : octave_matrix () { }
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44
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45 public:
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46
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47 static const octave_value instance;
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48
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49 bool is_null_value (void) const { return true; }
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50
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51 type_conv_info numeric_conversion_function (void) const;
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53 private:
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54
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55 DECLARE_OV_TYPEID_FUNCTIONS_AND_DATA
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56 };
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57
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58 // The special "" value
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59
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60 class
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61 OCTINTERP_API
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62 octave_null_str : public octave_char_matrix_str
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63 {
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64 octave_null_str (void) : octave_char_matrix_str () { }
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65
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66 public:
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67
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68 static const octave_value instance;
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69
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70 bool is_null_value (void) const { return true; }
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71
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72 type_conv_info numeric_conversion_function (void) const;
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75 private:
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76
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77 DECLARE_OV_TYPEID_FUNCTIONS_AND_DATA
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78 };
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79
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80 // The special '' value
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81
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82 class
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83 OCTINTERP_API
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84 octave_null_sq_str : public octave_char_matrix_sq_str
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85 {
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86 octave_null_sq_str (void) : octave_char_matrix_sq_str () { }
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87
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88 public:
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89
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90 static const octave_value instance;
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91
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92 bool is_null_value (void) const { return true; }
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93
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94 type_conv_info numeric_conversion_function (void) const;
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95
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96 private:
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97
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98 DECLARE_OV_TYPEID_FUNCTIONS_AND_DATA
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99 };
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100
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101 #endif