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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) 2000 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 (__GNUG__) && defined (USE_PRAGMA_INTERFACE_IMPLEMENTATION) |
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25 #pragma implementation |
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26 #endif |
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27 |
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28 #ifdef HAVE_CONFIG_H |
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29 #include <config.h> |
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30 #endif |
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31 |
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32 #include <cassert> |
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33 |
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34 #include <iostream> |
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35 |
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36 #include "ArrayN.h" |
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37 |
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38 #if defined (HEAVYWEIGHT_INDEXING) |
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39 #include "idx-vector.h" |
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40 #include "ArrayN-idx.h" |
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41 #endif |
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42 |
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43 #include "lo-error.h" |
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44 |
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45 // N-dimensional array class. |
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46 |
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47 template <class T> |
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48 int |
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49 ArrayN<T>::compute_index (const Array<int>& arr_idx) const |
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50 { |
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51 int retval = -1; |
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52 |
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53 int n = dimensions.length (); |
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54 |
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55 if (n > 0 && n == arr_idx.length ()) |
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56 { |
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57 retval = arr_idx(--n); |
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58 |
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59 while (--n >= 0) |
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60 { |
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61 retval *= dimensions(n); |
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62 retval += arr_idx(n); |
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63 } |
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64 } |
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65 else |
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66 (*current_liboctave_error_handler) |
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67 ("ArrayN<T>::compute_index: invalid arr_idxing operation"); |
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68 |
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69 return retval; |
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70 } |
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71 |
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72 // A guess (should be quite conservative). |
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73 #define MALLOC_OVERHEAD 1024 |
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74 |
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75 template <class T> |
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76 int |
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77 ArrayN<T>::get_size (const Array<int>& arr_idx) |
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78 { |
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79 // XXX KLUGE XXX |
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80 |
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81 // If an allocation of an array with r * c elements of type T |
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82 // would cause an overflow in the allocator when computing the |
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83 // size of the allocation, then return a value which, although |
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84 // not equivalent to the actual request, should be too large for |
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85 // most current hardware, but not so large to cause the |
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86 // allocator to barf on computing retval * sizeof (T). |
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87 |
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88 static int nl; |
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89 static double dl |
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90 = frexp (static_cast<double> |
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91 (INT_MAX - MALLOC_OVERHEAD) / sizeof (T), &nl); |
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92 |
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93 // This value should be an integer. If we return this value and |
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94 // things work the way we expect, we should be paying a visit to |
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95 // new_handler in no time flat. |
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96 static int max_items = static_cast<int> (ldexp (dl, nl)); |
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97 |
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98 int retval = max_items; |
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99 |
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100 int n = arr_idx.length (); |
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101 |
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102 int nt = 0; |
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103 double dt = 1; |
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104 |
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105 for (int i = 0; i < n; i++) |
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106 { |
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107 int narr_idx; |
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108 double darr_idx = frexp (static_cast<double> (arr_idx(i)), &narr_idx); |
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109 |
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110 nt += narr_idx; |
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111 dt *= darr_idx; |
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112 } |
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113 |
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114 if (dt <= 0.5) |
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115 { |
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116 nt--; |
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117 dt *= 2; |
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118 |
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119 if (dt <= 0.5) |
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120 nt--; |
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121 } |
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122 |
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123 if (nt < nl || (nt == nl && dt < dl)) |
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124 { |
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125 retval = 1; |
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126 |
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127 for (int i = 0; i < n; i++) |
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128 retval *= arr_idx(i); |
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129 } |
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130 |
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131 return retval; |
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132 } |
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133 |
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134 #undef MALLOC_OVERHEAD |
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135 |
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136 template <class T> |
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137 T |
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138 ArrayN<T>::range_error (const char *fcn, const Array<int>& arr_idx) const |
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139 { |
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140 // XXX FIXME XXX -- report index values too! |
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141 |
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142 (*current_liboctave_error_handler) ("range error in ArrayN"); |
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143 |
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144 return T (); |
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145 } |
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146 |
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147 template <class T> |
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148 T& |
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149 ArrayN<T>::range_error (const char *fcn, const Array<int>& arr_idx) |
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150 { |
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151 // XXX FIXME XXX -- report index values too! |
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152 |
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153 (*current_liboctave_error_handler) ("range error in ArrayN"); |
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154 |
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155 static T foo; |
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156 return foo; |
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157 } |
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158 |
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159 static inline bool |
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160 index_in_bounds (const Array<int>& arr_idx, const Array<int>& dimensions) |
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161 { |
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162 bool retval = true; |
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163 |
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164 int n = arr_idx.length (); |
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165 |
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166 if (n == dimensions.length ()) |
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167 { |
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168 for (int i = 0; i < n; i++) |
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169 { |
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170 if (arr_idx(i) < 0 || arr_idx(i) >= dimensions (i)) |
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171 { |
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172 retval = false; |
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173 break; |
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174 } |
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175 } |
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176 } |
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177 else |
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178 retval = false; |
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179 |
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180 return retval; |
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181 } |
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182 |
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183 static inline void |
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184 increment_index (Array<int>& arr_idx, const Array<int>& dimensions) |
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185 { |
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186 arr_idx(0)++; |
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187 |
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188 int n = arr_idx.length () - 1; |
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189 |
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190 for (int i = 0; i < n; i++) |
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191 { |
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192 if (arr_idx(i) < dimensions(i)) |
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193 break; |
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194 else |
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195 { |
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196 arr_idx(i) = 0; |
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197 arr_idx(i+1)++; |
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198 } |
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199 } |
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200 } |
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201 |
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202 template <class T> |
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203 void |
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204 ArrayN<T>::resize (const Array<int>& dims) |
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205 { |
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206 int n = dims.length (); |
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207 |
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208 for (int i = 0; i < n; i++) |
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209 { |
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210 if (dims(i) < 0) |
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211 { |
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212 (*current_liboctave_error_handler) |
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213 ("can't resize to negative dimension"); |
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214 return; |
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215 } |
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216 } |
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217 |
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218 bool no_change = true; |
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219 |
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220 for (int i = 0; i < n; i++) |
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221 { |
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222 if (dims(i) != dimensions(i)) |
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223 { |
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224 no_change = false; |
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225 break; |
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226 } |
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227 } |
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228 |
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229 if (no_change) |
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230 return; |
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231 |
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232 typename Array<T>::ArrayRep *old_rep = rep; |
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233 const T *old_data = data (); |
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234 |
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235 rep = new typename Array<T>::ArrayRep (get_size (dims)); |
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236 |
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237 Array<int> old_dimensions = dimensions; |
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238 |
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239 int old_len = length (); |
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240 |
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241 dimensions = dims; |
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242 |
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243 Array<int> arr_idx (dimensions.length (), 0); |
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244 |
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245 for (int i = 0; i < old_len; i++) |
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246 { |
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247 if (index_in_bounds (arr_idx, dimensions)) |
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248 xelem (arr_idx) = old_data[i]; |
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249 |
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250 increment_index (arr_idx, dimensions); |
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251 } |
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252 |
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253 if (--old_rep->count <= 0) |
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254 delete old_rep; |
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255 } |
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256 |
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257 template <class T> |
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258 void |
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259 ArrayN<T>::resize (const Array<int>& dims, const T& val) |
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260 { |
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261 int n = dims.length (); |
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262 |
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263 for (int i = 0; i < n; i++) |
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264 { |
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265 if (dims(i) < 0) |
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266 { |
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267 (*current_liboctave_error_handler) |
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268 ("can't resize to negative dimension"); |
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269 return; |
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270 } |
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271 } |
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272 |
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273 bool no_change = true; |
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274 |
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275 for (int i = 0; i < n; i++) |
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276 { |
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277 if (dims(i) != dimensions(i)) |
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278 { |
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279 no_change = false; |
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280 break; |
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281 } |
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282 } |
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283 |
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284 if (no_change) |
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285 return; |
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286 |
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287 typename Array<T>::ArrayRep *old_rep = rep; |
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288 const T *old_data = data (); |
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289 |
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290 int len = get_size (dims); |
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291 |
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292 rep = new typename Array<T>::ArrayRep (len); |
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293 |
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294 Array<int> old_dimensions = dimensions; |
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295 |
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296 int old_len = length (); |
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297 |
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298 dimensions = dims; |
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299 |
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300 Array<int> arr_idx (dimensions.length (), 0); |
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301 |
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302 for (int i = 0; i < len; i++) |
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303 rep->elem (i) = val; |
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304 |
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305 for (int i = 0; i < old_len; i++) |
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306 { |
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307 if (index_in_bounds (arr_idx, dimensions)) |
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308 xelem (arr_idx) = old_data[i]; |
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309 |
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310 increment_index (arr_idx, dimensions); |
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311 } |
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312 |
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313 if (--old_rep->count <= 0) |
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314 delete old_rep; |
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315 } |
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316 |
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317 template <class T> |
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318 ArrayN<T>& |
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319 ArrayN<T>::insert (const ArrayN<T>& a, const Array<int>& arr_idx) |
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320 { |
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321 int n = arr_idx.length (); |
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322 |
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323 if (n == dimensions.length ()) |
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324 { |
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325 Array<int> a_dims = a.dims (); |
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326 |
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327 for (int i = 0; i < n; i++) |
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328 { |
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329 if (arr_idx(i) < 0 || arr_idx(i) + a_dims(i) > dimensions(i)) |
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330 { |
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331 (*current_liboctave_error_handler) |
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332 ("ArrayN<T>::insert: range error for insert"); |
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333 return *this; |
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334 } |
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335 } |
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336 |
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337 #if 0 |
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338 // XXX FIXME XXX -- need to copy elements |
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339 |
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340 for (int j = 0; j < a_cols; j++) |
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341 for (int i = 0; i < a_rows; i++) |
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342 elem (r+i, c+j) = a.elem (i, j); |
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343 #endif |
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344 |
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345 } |
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346 else |
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347 (*current_liboctave_error_handler) |
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348 ("ArrayN<T>::insert: invalid indexing operation"); |
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349 |
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350 return *this; |
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351 } |
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352 |
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353 template <class T> |
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354 std::ostream& |
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355 operator << (std::ostream& os, const ArrayN<T>& a) |
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356 { |
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357 Array<int> dims = a.dimensions; |
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358 |
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359 int n_dims = dims.length (); |
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360 |
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361 os << n_dims << "-dimensional array ("; |
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362 |
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363 for (int i = 0; i < n_dims - 1; i++) |
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364 os << dims(i) << "x"; |
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365 os << dims(n_dims-1) << ")\n\n"; |
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366 |
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367 os << "data:\n"; |
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368 |
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369 int n = ArrayN<T>::get_size (dims); |
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370 |
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371 // for (int i = 0; i < n; i++) |
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372 // os << a.elem (i) << "\n"; |
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373 |
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374 return os; |
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375 } |
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376 |
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377 /* |
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378 ;;; Local Variables: *** |
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379 ;;; mode: C++ *** |
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380 ;;; End: *** |
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381 */ |
