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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_Array_h) |
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25 #define octave_Array_h 1 |
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26 |
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27 #if defined (__GNUG__) && defined (USE_PRAGMA_INTERFACE_IMPLEMENTATION) |
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28 #pragma interface |
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29 #endif |
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30 |
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31 #include <cassert> |
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32 #include <cstddef> |
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33 |
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34 #include <iostream> |
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35 |
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36 #include "lo-utils.h" |
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37 |
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38 class idx_vector; |
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39 |
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40 // For now, define this here if it is not already defined. Not doing |
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41 // this can result in bugs that are very hard to find. |
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42 |
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43 #ifndef HEAVYWEIGHT_INDEXING |
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44 #define HEAVYWEIGHT_INDEXING 1 |
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45 #endif |
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46 |
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47 // One dimensional array class. Handles the reference counting for |
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48 // all the derived classes. |
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49 |
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50 template <class T> |
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51 T |
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52 resize_fill_value (const T& x) |
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53 { |
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54 return x; |
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55 } |
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56 |
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57 template <class T> |
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58 class |
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59 Array |
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60 { |
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61 protected: |
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62 |
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63 // The real representation of all arrays. |
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64 |
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65 class ArrayRep |
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66 { |
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67 public: |
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68 |
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69 T *data; |
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70 int len; |
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71 int count; |
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72 |
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73 ArrayRep& operator = (const ArrayRep& a); |
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74 |
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75 ArrayRep (T *d, int l) : data (d), len (l), count (1) { } |
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76 |
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77 ArrayRep (void) : data (0), len (0), count (1) { } |
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78 |
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79 explicit ArrayRep (int n) : data (new T [n]), len (n), count (1) { } |
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80 |
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81 ArrayRep (const ArrayRep& a) |
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82 : data (new T [a.len]), len (a.len), count (1) |
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83 { |
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84 for (int i = 0; i < len; i++) |
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85 data[i] = a.data[i]; |
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86 } |
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87 |
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88 ~ArrayRep (void) { delete [] data; } |
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89 |
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90 int length (void) const { return len; } |
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91 |
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92 T& elem (int n) { return data[n]; } |
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93 |
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94 T elem (int n) const { return data[n]; } |
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95 |
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96 void qsort (int (*compare) (const void *, const void *)) |
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97 { |
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98 octave_qsort (data, static_cast<size_t> (len), sizeof (T), compare); |
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99 } |
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100 }; |
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101 |
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102 void make_unique (void) |
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103 { |
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104 if (rep->count > 1) |
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105 { |
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106 --rep->count; |
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107 rep = new ArrayRep (*rep); |
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108 } |
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109 } |
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110 |
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111 #ifdef HEAVYWEIGHT_INDEXING |
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112 idx_vector *idx; |
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113 int max_indices; |
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114 int idx_count; |
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115 #endif |
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116 |
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117 protected: |
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118 |
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119 typename Array<T>::ArrayRep *rep; |
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120 |
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121 Array (T *d, int l) |
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122 { |
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123 rep = new typename Array<T>::ArrayRep (d, l); |
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124 |
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125 #ifdef HEAVYWEIGHT_INDEXING |
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126 idx = 0; |
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127 max_indices = 1; |
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128 idx_count = 0; |
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129 #endif |
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130 } |
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131 |
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132 public: |
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133 |
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134 Array (void) |
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135 { |
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136 rep = new typename Array<T>::ArrayRep (); |
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137 |
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138 #ifdef HEAVYWEIGHT_INDEXING |
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139 idx = 0; |
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140 max_indices = 1; |
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141 idx_count = 0; |
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142 #endif |
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143 } |
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144 |
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145 explicit Array (int n) |
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146 { |
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147 rep = new typename Array<T>::ArrayRep (n); |
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148 |
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149 #ifdef HEAVYWEIGHT_INDEXING |
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150 idx = 0; |
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151 max_indices = 1; |
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152 idx_count = 0; |
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153 #endif |
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154 } |
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155 |
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156 Array (int n, const T& val); |
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157 |
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158 Array (const Array<T>& a) |
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159 { |
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160 rep = a.rep; |
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161 rep->count++; |
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162 |
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163 #ifdef HEAVYWEIGHT_INDEXING |
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164 max_indices = a.max_indices; |
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165 idx_count = 0; |
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166 idx = 0; |
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167 #endif |
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168 } |
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169 |
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170 ~Array (void); |
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171 |
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172 Array<T>& operator = (const Array<T>& a); |
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173 |
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174 int capacity (void) const { return rep->length (); } |
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175 int length (void) const { return rep->length (); } |
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176 |
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177 T range_error (const char *fcn, int n) const; |
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178 T& range_error (const char *fcn, int n); |
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179 |
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180 // No checking, even for multiple references, ever. |
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181 |
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182 T& xelem (int n) { return rep->elem (n); } |
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183 T xelem (int n) const { return rep->elem (n); } |
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184 |
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185 // XXX FIXME XXX -- would be nice to fix this so that we don't |
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186 // unnecessarily force a copy, but that is not so easy, and I see no |
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187 // clean way to do it. |
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188 |
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189 T& checkelem (int n) |
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190 { |
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191 if (n < 0 || n >= rep->length ()) |
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192 return range_error ("T& Array<T>::checkelem", n); |
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193 else |
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194 { |
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195 make_unique (); |
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196 return xelem (n); |
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197 } |
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198 } |
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199 |
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200 T& elem (int n) |
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201 { |
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202 make_unique (); |
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203 return xelem (n); |
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204 } |
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205 |
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206 #if defined (BOUNDS_CHECKING) |
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207 T& operator () (int n) { return checkelem (n); } |
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208 #else |
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209 T& operator () (int n) { return elem (n); } |
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210 #endif |
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211 |
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212 T checkelem (int n) const |
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213 { |
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214 if (n < 0 || n >= rep->length ()) |
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215 return range_error ("T Array<T>::checkelem", n); |
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216 else |
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217 return xelem (n); |
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218 } |
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219 |
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220 T elem (int n) const { return xelem (n); } |
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221 |
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222 #if defined (BOUNDS_CHECKING) |
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223 T operator () (int n) const { return checkelem (n); } |
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224 #else |
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225 T operator () (int n) const { return elem (n); } |
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226 #endif |
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227 |
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228 void resize (int n); |
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229 void resize (int n, const T& val); |
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230 |
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231 const T *data (void) const { return rep->data; } |
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232 |
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233 const T *fortran_vec (void) const { return data (); } |
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234 |
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235 T *fortran_vec (void); |
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236 |
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237 Array<T>& qsort (int (*compare) (const void *, const void *)) |
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238 { |
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239 make_unique (); |
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240 |
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241 rep->qsort (compare); |
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242 |
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243 return *this; |
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244 } |
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245 |
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246 #ifdef HEAVYWEIGHT_INDEXING |
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247 |
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248 void set_max_indices (int mi) { max_indices = mi; } |
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249 |
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250 void clear_index (void); |
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251 |
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252 void set_index (const idx_vector& i); |
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253 |
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254 int index_count (void) const { return idx_count; } |
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255 |
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256 idx_vector *get_idx (void) const { return idx; } |
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257 |
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258 void maybe_delete_elements (idx_vector& i); |
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259 |
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260 Array<T> value (void); |
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261 |
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262 Array<T> index (idx_vector& i, int resize_ok = 0, |
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263 const T& rfv = resize_fill_value (T ())) const; |
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264 |
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265 #endif |
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266 |
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267 // static T resize_fill_value (void) { return T (); } |
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268 |
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269 void print_info (std::ostream& os, const std::string& prefix) const; |
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270 }; |
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271 |
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272 template <class LT, class RT> |
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273 int |
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274 assign (Array<LT>& lhs, const Array<RT>& rhs, const LT& rfv); |
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275 |
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276 |
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277 template <class LT, class RT> |
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278 int |
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279 assign (Array<LT>& lhs, const Array<RT>& rhs) |
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280 { |
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281 // return assign (lhs, rhs, Array<LT>::resize_fill_value ()); |
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282 return assign (lhs, rhs, resize_fill_value (LT ())); |
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283 } |
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284 |
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285 #endif |
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286 |
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287 /* |
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288 ;;; Local Variables: *** |
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289 ;;; mode: C++ *** |
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290 ;;; End: *** |
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291 */ |
