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1 // Template array classes -*- C++ -*- |
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2 /* |
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3 |
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4 Copyright (C) 1996 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 #if defined (__GNUG__) |
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28 #pragma interface |
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29 #endif |
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30 |
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31 #define HEAVYWEIGHT_INDEXING 1 |
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32 |
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33 #include <cassert> |
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34 #include <cstdlib> |
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35 |
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36 #include "Array2.h" |
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37 #include "lo-error.h" |
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38 |
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39 class idx_vector; |
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40 |
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41 // A two-dimensional array with diagonal elements only. |
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42 // |
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43 // Idea and example code for Proxy class and functions from: |
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44 // |
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45 // From: kanze@us-es.sel.de (James Kanze) |
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46 // Subject: Re: How to overload [] to do READ/WRITE differently ? |
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47 // Message-ID: <KANZE.93Nov29151407@slsvhdt.us-es.sel.de> |
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48 // Sender: news@us-es.sel.de |
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49 // Date: 29 Nov 1993 14:14:07 GMT |
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50 // -- |
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51 // James Kanze email: kanze@us-es.sel.de |
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52 // GABI Software, Sarl., 8 rue du Faisan, F-67000 Strasbourg, France |
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53 |
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54 template <class T> |
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55 class DiagArray2 : public Array<T> |
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56 { |
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57 private: |
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58 |
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59 T get (int i) { return Array<T>::xelem (i); } |
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60 |
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61 void set (const T& val, int i) { Array<T>::xelem (i) = val; } |
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62 |
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63 class Proxy |
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64 { |
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65 public: |
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66 |
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67 Proxy (DiagArray2<T> *ref, int r, int c) |
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68 : i (r), j (c), object (ref) { } |
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69 |
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70 const Proxy& operator = (const T& val) const |
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71 { |
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72 if (i == j) |
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73 { |
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74 if (object) |
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75 object->set (val, i); |
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76 } |
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77 else |
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78 (*current_liboctave_error_handler) |
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79 ("invalid assignment to off-diagonal in diagonal array"); |
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80 |
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81 return *this; |
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82 } |
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83 |
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84 operator T () const |
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85 { |
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86 if (object && i == j) |
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87 return object->get (i); |
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88 else |
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89 { |
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90 static T foo (0); |
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91 return foo; |
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92 } |
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93 } |
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94 |
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95 private: |
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96 |
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97 // XXX FIXME XXX -- this is declared private to keep the user from |
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98 // taking the address of a Proxy. Maybe it should be implemented |
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99 // by means of a companion function in the DiagArray2 class. |
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100 |
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101 T *operator& () const { assert (0); return (T *) 0; } |
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102 |
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103 int i; |
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104 int j; |
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105 |
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106 DiagArray2<T> *object; |
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107 |
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108 }; |
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109 |
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110 friend class Proxy; |
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111 |
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112 protected: |
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113 |
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114 int nr; |
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115 int nc; |
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116 |
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117 DiagArray2 (T *d, int r, int c) : Array<T> (d, r < c ? r : c) |
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118 { |
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119 nr = r; |
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120 nc = c; |
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121 set_max_indices (2); |
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122 } |
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123 |
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124 public: |
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125 |
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126 DiagArray2 (void) : Array<T> () |
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127 { |
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128 nr = 0; |
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129 nc = 0; |
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130 set_max_indices (2); |
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131 } |
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132 |
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133 DiagArray2 (int r, int c) : Array<T> (r < c ? r : c) |
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134 { |
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135 nr = r; |
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136 nc = c; |
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137 set_max_indices (2); |
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138 } |
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139 |
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140 DiagArray2 (int r, int c, const T& val) : Array<T> (r < c ? r : c, val) |
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141 { |
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142 nr = r; |
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143 nc = c; |
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144 set_max_indices (2); |
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145 } |
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146 |
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147 DiagArray2 (const Array<T>& a) : Array<T> (a) |
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148 { |
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149 nr = nc = a.length (); |
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150 set_max_indices (2); |
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151 } |
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152 |
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153 DiagArray2 (const DiagArray2<T>& a) : Array<T> (a) |
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154 { |
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155 nr = a.nr; |
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156 nc = a.nc; |
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157 set_max_indices (2); |
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158 } |
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159 |
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160 ~DiagArray2 (void) { } |
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161 |
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162 DiagArray2<T>& operator = (const DiagArray2<T>& a) |
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163 { |
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164 if (this != &a) |
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165 { |
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166 Array<T>::operator = (a); |
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167 nr = a.nr; |
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168 nc = a.nc; |
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169 } |
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170 |
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171 return *this; |
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172 } |
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173 |
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174 #if 0 |
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175 operator Array2<T> () const |
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176 { |
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177 Array2<T> retval (nr, nc, T (0)); |
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178 |
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179 int len = nr < nc ? nr : nc; |
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180 |
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181 for (int i = 0; i < len; i++) |
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182 retval.xelem (i, i) = xelem (i, i); |
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183 |
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184 return retval; |
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185 } |
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186 #endif |
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187 |
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188 int dim1 (void) const { return nr; } |
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189 int dim2 (void) const { return nc; } |
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190 |
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191 int rows (void) const { return nr; } |
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192 int cols (void) const { return nc; } |
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193 int columns (void) const { return nc; } |
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194 |
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195 #if 1 |
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196 Proxy elem (int r, int c) |
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197 { |
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198 return Proxy (this, r, c); |
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199 } |
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200 |
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201 Proxy checkelem (int r, int c) |
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202 { |
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203 if (r < 0 || c < 0 || r >= nr || c >= nc) |
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204 { |
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205 (*current_liboctave_error_handler) ("range error"); |
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206 return Proxy (0, r, c); |
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207 } |
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208 else |
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209 return Proxy (this, r, c); |
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210 } |
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211 |
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212 Proxy operator () (int r, int c) |
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213 { |
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214 if (r < 0 || c < 0 || r >= nr || c >= nc) |
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215 { |
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216 (*current_liboctave_error_handler) ("range error"); |
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217 return Proxy (0, r, c); |
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218 } |
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219 else |
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220 return Proxy (this, r, c); |
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221 } |
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222 #else |
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223 T& elem (int r, int c); |
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224 T& checkelem (int r, int c); |
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225 T& operator () (int r, int c); |
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226 #endif |
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227 |
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228 T elem (int r, int c) const; |
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229 T checkelem (int r, int c) const; |
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230 T operator () (int r, int c) const; |
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231 |
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232 // No checking. |
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233 |
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234 T& xelem (int r, int c); |
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235 T xelem (int r, int c) const; |
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236 |
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237 void resize (int n, int m); |
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238 void resize (int n, int m, const T& val); |
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239 |
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240 void maybe_delete_elements (idx_vector& i, idx_vector& j); |
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241 }; |
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242 |
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243 #endif |
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244 |
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245 /* |
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246 ;;; Local Variables: *** |
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247 ;;; mode: C++ *** |
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248 ;;; page-delimiter: "^/\\*" *** |
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249 ;;; End: *** |
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250 */ |
