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1 // Template array classes |
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2 /* |
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3 |
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4 Copyright (C) 1996, 1997 John W. Eaton |
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5 |
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6 This file is part of Octave. |
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7 |
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8 Octave is free software; you can redistribute it and/or modify it |
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9 under the terms of the GNU General Public License as published by the |
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10 Free Software Foundation; either version 2, or (at your option) any |
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11 later version. |
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12 |
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13 Octave is distributed in the hope that it will be useful, but WITHOUT |
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14 ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
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15 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
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16 for more details. |
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17 |
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18 You should have received a copy of the GNU General Public License |
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19 along with Octave; see the file COPYING. If not, write to the Free |
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20 Software Foundation, 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. |
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21 |
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22 */ |
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23 |
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24 #if !defined (octave_DiagArray2_h) |
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25 #define octave_DiagArray2_h 1 |
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26 |
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27 #include <cassert> |
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28 #include <cstdlib> |
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29 |
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30 #include "Array.h" |
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31 #include "lo-error.h" |
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32 |
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33 class idx_vector; |
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34 |
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35 // A two-dimensional array with diagonal elements only. |
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36 // |
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37 // Idea and example code for Proxy class and functions from: |
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38 // |
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39 // From: kanze@us-es.sel.de (James Kanze) |
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40 // Subject: Re: How to overload [] to do READ/WRITE differently ? |
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41 // Message-ID: <KANZE.93Nov29151407@slsvhdt.us-es.sel.de> |
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42 // Sender: news@us-es.sel.de |
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43 // Date: 29 Nov 1993 14:14:07 GMT |
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44 // -- |
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45 // James Kanze email: kanze@us-es.sel.de |
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46 // GABI Software, Sarl., 8 rue du Faisan, F-67000 Strasbourg, France |
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47 |
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48 template <class T> |
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49 class |
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50 DiagArray2 : public Array<T> |
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51 { |
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52 private: |
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53 |
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54 T get (octave_idx_type i) { return Array<T>::xelem (i); } |
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55 |
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56 void set (const T& val, octave_idx_type i) { Array<T>::xelem (i) = val; } |
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57 |
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58 class Proxy |
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59 { |
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60 public: |
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61 |
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62 Proxy (DiagArray2<T> *ref, octave_idx_type r, octave_idx_type c) |
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63 : i (r), j (c), object (ref) { } |
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64 |
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65 const Proxy& operator = (const T& val) const |
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66 { |
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67 if (i == j) |
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68 { |
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69 if (object) |
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70 object->set (val, i); |
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71 } |
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72 else |
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73 (*current_liboctave_error_handler) |
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74 ("invalid assignment to off-diagonal in diagonal array"); |
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75 |
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76 return *this; |
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77 } |
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78 |
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79 operator T () const |
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80 { |
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81 if (object && i == j) |
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82 return object->get (i); |
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83 else |
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84 { |
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85 static T foo; |
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86 return foo; |
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87 } |
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88 } |
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89 |
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90 private: |
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91 |
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92 // XXX FIXME XXX -- this is declared private to keep the user from |
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93 // taking the address of a Proxy. Maybe it should be implemented |
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94 // by means of a companion function in the DiagArray2 class. |
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95 |
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96 T *operator& () const { assert (0); return (T *) 0; } |
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97 |
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98 octave_idx_type i; |
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99 octave_idx_type j; |
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100 |
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101 DiagArray2<T> *object; |
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102 |
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103 }; |
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104 |
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105 friend class Proxy; |
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106 |
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107 protected: |
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108 |
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109 DiagArray2 (T *d, octave_idx_type r, octave_idx_type c) : Array<T> (d, r < c ? r : c) |
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110 { Array<T>::dimensions = dim_vector (r, c); } |
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111 |
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112 public: |
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113 |
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114 DiagArray2 (void) : Array<T> (dim_vector (0, 0)) { } |
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115 |
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116 DiagArray2 (octave_idx_type r, octave_idx_type c) : Array<T> (r < c ? r : c) |
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117 { this->dimensions = dim_vector (r, c); } |
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118 |
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119 DiagArray2 (octave_idx_type r, octave_idx_type c, const T& val) : Array<T> (r < c ? r : c) |
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120 { |
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121 this->dimensions = dim_vector (r, c); |
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122 |
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123 fill (val); |
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124 } |
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125 |
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126 DiagArray2 (const Array<T>& a) : Array<T> (a) |
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127 { this->dimensions = dim_vector (a.length (), a.length ()); } |
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128 |
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129 DiagArray2 (const DiagArray2<T>& a) : Array<T> (a) |
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130 { this->dimensions = a.dims (); } |
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131 |
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132 ~DiagArray2 (void) { } |
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133 |
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134 DiagArray2<T>& operator = (const DiagArray2<T>& a) |
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135 { |
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136 if (this != &a) |
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137 Array<T>::operator = (a); |
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138 |
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139 return *this; |
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140 } |
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141 |
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142 Proxy elem (octave_idx_type r, octave_idx_type c) |
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143 { |
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144 return Proxy (this, r, c); |
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145 } |
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146 |
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147 Proxy checkelem (octave_idx_type r, octave_idx_type c) |
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148 { |
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149 if (r < 0 || c < 0 || r >= this->dim1 () || c >= this->dim2 ()) |
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150 { |
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151 (*current_liboctave_error_handler) ("range error in DiagArray2"); |
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152 return Proxy (0, r, c); |
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153 } |
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154 else |
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155 return Proxy (this, r, c); |
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156 } |
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157 |
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158 Proxy operator () (octave_idx_type r, octave_idx_type c) |
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159 { |
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160 if (r < 0 || c < 0 || r >= this->dim1 () || c >= this->dim2 ()) |
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161 { |
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162 (*current_liboctave_error_handler) ("range error in DiagArray2"); |
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163 return Proxy (0, r, c); |
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164 } |
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165 else |
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166 return Proxy (this, r, c); |
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167 } |
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168 |
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169 T elem (octave_idx_type r, octave_idx_type c) const; |
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170 T checkelem (octave_idx_type r, octave_idx_type c) const; |
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171 T operator () (octave_idx_type r, octave_idx_type c) const; |
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172 |
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173 // No checking. |
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174 |
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175 T& xelem (octave_idx_type r, octave_idx_type c); |
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176 T xelem (octave_idx_type r, octave_idx_type c) const; |
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177 |
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178 void resize (octave_idx_type n, octave_idx_type m); |
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179 void resize (octave_idx_type n, octave_idx_type m, const T& val); |
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180 |
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181 void maybe_delete_elements (idx_vector& i, idx_vector& j); |
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182 }; |
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183 |
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184 #endif |
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185 |
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186 /* |
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187 ;;; Local Variables: *** |
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188 ;;; mode: C++ *** |
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189 ;;; End: *** |
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190 */ |
