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annotate libinterp/octave-value/ov-null-mat.cc @ 30565:83f9f8bda883

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maint: Merge stable to default.
author John W. Eaton <jwe@octave.org>
date Tue, 28 Dec 2021 18:59:33 -0500
parents 841a10208c38 796f54d4ddbf
children e88a07dec498
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1 ////////////////////////////////////////////////////////////////////////
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2 //
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3 // Copyright (C) 2008-2022 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
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6 // distribution or <https://octave.org/copyright/>.
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7 //
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8 // This file is part of Octave.
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9 //
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10 // Octave is free software: you can redistribute it and/or modify it
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11 // under the terms of the GNU General Public License as published by
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12 // the Free Software Foundation, either version 3 of the License, or
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13 // (at your option) any later version.
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14 //
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15 // Octave is distributed in the hope that it will be useful, but
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16 // WITHOUT ANY WARRANTY; without even the implied warranty of
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17 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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18 // GNU General Public License for more details.
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19 //
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20 // You should have received a copy of the GNU General Public License
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21 // along with Octave; see the file COPYING. If not, see
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22 // <https://www.gnu.org/licenses/>.
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23 //
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24 ////////////////////////////////////////////////////////////////////////
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25
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26 #if defined (HAVE_CONFIG_H)
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27 # include "config.h"
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28 #endif
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29
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30 #include "ov-null-mat.h"
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31 #include "ops.h"
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32 #include "defun.h"
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33
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34 DEFINE_OV_TYPEID_FUNCTIONS_AND_DATA (octave_null_matrix, "null_matrix",
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35 "double");
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36
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37 const octave_value octave_null_matrix::instance (new octave_null_matrix ());
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38
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39 static octave_base_value *
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40 default_null_matrix_numeric_conversion_function (const octave_base_value& a)
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41 {
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42 // The cast is not necessary?
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43 // const octave_null_matrix& v = dynamic_cast<const octave_null_matrix&> (a);
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44
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45 return a.empty_clone ();
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46 }
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47
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48 octave_base_value::type_conv_info
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49 octave_null_matrix::numeric_conversion_function (void) const
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50 {
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51 return octave_base_value::type_conv_info
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52 (default_null_matrix_numeric_conversion_function,
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53 octave_matrix::static_type_id ());
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54 }
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55
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56 DEFINE_OV_TYPEID_FUNCTIONS_AND_DATA (octave_null_str, "null_string", "char");
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57
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58 const octave_value octave_null_str::instance (new octave_null_str ());
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59
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60 static octave_base_value *
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61 default_null_str_numeric_conversion_function (const octave_base_value& a)
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62 {
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63 // The cast is not necessary?
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64 // const octave_null_str& v = dynamic_cast<const octave_null_str&> (a);
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65
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66 return a.empty_clone ();
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67 }
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68
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69 octave_base_value::type_conv_info
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70 octave_null_str::numeric_conversion_function (void) const
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71 {
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72 return octave_base_value::type_conv_info
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73 (default_null_str_numeric_conversion_function,
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74 octave_char_matrix_str::static_type_id ());
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75 }
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76
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77 DEFINE_OV_TYPEID_FUNCTIONS_AND_DATA (octave_null_sq_str, "null_sq_string",
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78 "char");
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79
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80 const octave_value octave_null_sq_str::instance (new octave_null_sq_str ());
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81
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82 static octave_base_value *
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83 default_null_sq_str_numeric_conversion_function (const octave_base_value& a)
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84 {
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85 // The cast is not necessary?
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86 // const octave_null_sq_str& v = dynamic_cast<const octave_null_sq_str&> (a);
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87
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88 return a.empty_clone ();
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89 }
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90
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91 octave_base_value::type_conv_info
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92 octave_null_sq_str::numeric_conversion_function (void) const
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93 {
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94 return octave_base_value::type_conv_info
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95 (default_null_sq_str_numeric_conversion_function,
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96 octave_char_matrix_sq_str::static_type_id ());
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97 }
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98
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99 OCTAVE_NAMESPACE_BEGIN
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100
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101 DEFUN (isnull, args, ,
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102 doc: /* -*- texinfo -*-
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103 @deftypefn {} {@var{tf} =} isnull (@var{x})
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104 Return true if @var{x} is a special null matrix, string, or single quoted
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105 string.
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106
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107 Indexed assignment with such a null value on the right-hand side should delete
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108 array elements. This function is used in place of @code{isempty} when
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109 overloading the indexed assignment method (@code{subsasgn}) for user-defined
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110 classes. @code{isnull} is used to distinguish between these two cases:
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111
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112 @code{@var{A}(@var{I}) = []}
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113
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114 and
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115
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116 @code{@var{X} = []; @var{A}(@var{I}) = @var{X}}
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117
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118 In the first assignment, the right-hand side is @code{[]} which is a special
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119 null value. As long as the index @var{I} is not empty, this code should
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120 delete elements from @var{A} rather than perform assignment.
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121
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122 In the second assignment, the right-hand side is empty (because @var{X} is
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123 @code{[]}), but it is @strong{not} null. This code should assign the empty
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124 value to elements in @var{A}.
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125
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126 An example from Octave's built-in char class demonstrates the interpreter
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127 behavior when @code{isnull} is used correctly.
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128
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129 @example
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130 @group
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131 str = "Hello World";
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132 nm = "Wally";
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133 str(7:end) = nm # indexed assignment
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134 @result{} str = Hello Wally
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135 str(7:end) = "" # indexed deletion
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136 @result{} str = Hello
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137 @end group
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138 @end example
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139 @seealso{isempty, isindex}
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140 @end deftypefn */)
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141 {
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142 if (args.length () != 1)
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143 print_usage ();
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144
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145 return ovl (args(0).isnull ());
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146 }
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147
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148 /*
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149 %!assert (isnull ([]), true)
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150 %!assert (isnull ([1]), false)
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151 %!assert (isnull (zeros (0,3)), false)
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152 %!assert (isnull (""), true)
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153 %!assert (isnull ("A"), false)
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154 %!assert (isnull (''), true)
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155 %!assert (isnull ('A'), false)
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156 %!test
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157 %! x = [];
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158 %! assert (isnull (x), false);
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159 */
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160
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161 OCTAVE_NAMESPACE_END