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doc: Update documentation on indexing expressions * expr.txi, octave.texi: Update documentation on indexing expressions
author Rik <octave@nomad.inbox5.com>
date Sun, 11 Dec 2011 22:15:48 -0800
parents 12df7854fa7c
children 72c96de7a403
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1 /*
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2
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3 Copyright (C) 2008-2011 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_null_matrix_h)
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24 #define octave_null_matrix_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) object,
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32 // that can have shallow copies. Cloning the object returns just a normal empty matrix,
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33 // so all the shallow copies are, in fact, read-only. This conveniently ensures that any
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34 // attempt to fiddle with the null matrix destroys its special status.
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35
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36 // The special [] value.
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37
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38 class
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39 OCTINTERP_API
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40 octave_null_matrix : public octave_matrix
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41 {
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42 octave_null_matrix (void) : octave_matrix () { }
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43
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44 public:
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45
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46 static const octave_value instance;
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47
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48 bool is_null_value (void) const { return true; }
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49
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50 type_conv_info numeric_conversion_function (void) const;
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52 private:
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53
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54 DECLARE_OV_TYPEID_FUNCTIONS_AND_DATA
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55 };
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56
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57 // The special "" value
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58
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59 class
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60 OCTINTERP_API
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61 octave_null_str : public octave_char_matrix_str
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62 {
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63 octave_null_str (void) : octave_char_matrix_str () { }
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64
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65 public:
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66
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67 static const octave_value instance;
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68
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69 bool is_null_value (void) const { return true; }
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70
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71 type_conv_info numeric_conversion_function (void) const;
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72
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73
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74 private:
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75
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76 DECLARE_OV_TYPEID_FUNCTIONS_AND_DATA
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77 };
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78
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79 // The special '' value
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80
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81 class
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82 OCTINTERP_API
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83 octave_null_sq_str : public octave_char_matrix_sq_str
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84 {
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85 octave_null_sq_str (void) : octave_char_matrix_sq_str () { }
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86
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87 public:
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88
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89 static const octave_value instance;
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90
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91 bool is_null_value (void) const { return true; }
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92
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93 type_conv_info numeric_conversion_function (void) const;
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94
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95 private:
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96
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97 DECLARE_OV_TYPEID_FUNCTIONS_AND_DATA
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98 };
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99
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100 #endif