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1 /* |
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2 |
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3 Copyright (C) 2003 John W. Eaton |
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4 |
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5 This file is part of Octave. |
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6 |
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7 Octave is free software; you can redistribute it and/or modify it |
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8 under the terms of the GNU General Public License as published by the |
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9 Free Software Foundation; either version 2, or (at your option) any |
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10 later version. |
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11 |
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12 Octave is distributed in the hope that it will be useful, but WITHOUT |
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13 ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
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14 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
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15 for more details. |
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16 |
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17 You should have received a copy of the GNU General Public License |
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18 along with Octave; see the file COPYING. If not, write to the Free |
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19 Software Foundation, 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. |
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20 |
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21 */ |
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22 |
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23 #if !defined (octave_dim_vector_h) |
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24 #define octave_dim_vector_h 1 |
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25 |
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26 #if defined (__GNUG__) && defined (USE_PRAGMA_INTERFACE_IMPLEMENTATION) |
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27 #pragma interface |
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28 #endif |
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29 |
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30 #include <cassert> |
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31 #include <string> |
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32 |
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33 #include "lo-sstream.h" |
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34 |
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35 class |
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36 dim_vector |
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37 { |
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38 protected: |
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39 |
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40 class dim_vector_rep |
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41 { |
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42 public: |
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43 |
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44 int *dims; |
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45 int ndims; |
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46 int count; |
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47 |
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48 dim_vector_rep (void) : dims (0), ndims (0), count (1) { } |
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49 |
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50 dim_vector_rep (int n) : dims (new int [1]), ndims (1), count (1) |
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51 { |
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52 dims[0] = n; |
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53 } |
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54 |
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55 dim_vector_rep (int r, int c) : dims (new int [2]), ndims (2), count (1) |
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56 { |
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57 dims[0] = r; |
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58 dims[1] = c; |
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59 } |
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60 |
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61 dim_vector_rep (int r, int c, int p) |
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62 : dims (new int [3]), ndims (3), count (1) |
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63 { |
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64 dims[0] = r; |
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65 dims[1] = c; |
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66 dims[2] = p; |
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67 } |
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68 |
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69 dim_vector_rep (const dim_vector_rep& dv) |
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70 : dims (dv.ndims > 0 ? new int [dv.ndims] : 0), |
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71 ndims (dv.ndims > 0 ? dv.ndims : 0), count (1) |
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72 { |
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73 if (dims) |
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74 { |
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75 for (int i = 0; i < ndims; i++) |
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76 dims[i] = dv.dims[i]; |
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77 } |
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78 } |
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79 |
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80 dim_vector_rep (int n, const dim_vector_rep *dv, int fill_value = 0) |
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81 : dims ((dv && n > 0) ? new int [n] : 0), |
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82 ndims (n > 0 ? n : 0), count (1) |
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83 { |
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84 if (dims) |
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85 { |
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86 int dv_ndims = dv ? dv->ndims : 0; |
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87 |
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88 int min_len = n < dv_ndims ? n : dv_ndims; |
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89 |
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90 for (int i = 0; i < min_len; i++) |
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91 dims[i] = dv->dims[i]; |
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92 |
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93 for (int i = dv_ndims; i < n; i++) |
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94 dims[i] = fill_value; |
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95 } |
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96 } |
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97 |
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98 ~dim_vector_rep (void) { delete [] dims; } |
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99 |
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100 int length (void) const { return ndims; } |
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101 |
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102 int& elem (int i) |
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103 { |
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104 assert (i >= 0 && i < ndims); |
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105 return dims[i]; |
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106 } |
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107 |
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108 int elem (int i) const |
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109 { |
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110 assert (i >= 0 && i < ndims); |
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111 return dims[i]; |
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112 } |
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113 |
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114 void chop_trailing_singletons (void) |
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115 { |
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116 for (int i = ndims - 1; i > 1; i--) |
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117 { |
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118 if (dims[i] == 1) |
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119 ndims--; |
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120 else |
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121 break; |
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122 } |
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123 } |
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124 |
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125 private: |
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126 |
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127 // No assignment! |
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128 |
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129 dim_vector_rep& operator = (const dim_vector_rep& dv); |
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130 }; |
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131 |
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132 dim_vector_rep *rep; |
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133 |
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134 void make_unique (void) |
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135 { |
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136 if (rep->count > 1) |
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137 { |
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138 --rep->count; |
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139 rep = new dim_vector_rep (*rep); |
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140 } |
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141 } |
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142 |
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143 private: |
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144 |
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145 dim_vector_rep *nil_rep (void) const |
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146 { |
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147 static dim_vector_rep *nr = new dim_vector_rep (); |
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148 |
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149 return nr; |
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150 } |
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151 |
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152 public: |
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153 |
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154 explicit dim_vector (void) |
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155 : rep (nil_rep ()) { rep->count++; } |
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156 |
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157 explicit dim_vector (int n) |
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158 : rep (new dim_vector_rep (n)) { } |
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159 |
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160 explicit dim_vector (int r, int c) |
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161 : rep (new dim_vector_rep (r, c)) { } |
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162 |
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163 explicit dim_vector (int r, int c, int p) |
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164 : rep (new dim_vector_rep (r, c, p)) { } |
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165 |
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166 dim_vector (const dim_vector& dv) |
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167 : rep (dv.rep) { rep->count++; } |
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168 |
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169 dim_vector& operator = (const dim_vector& dv) |
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170 { |
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171 if (&dv != this) |
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172 { |
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173 if (--rep->count <= 0) |
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174 delete rep; |
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175 |
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176 rep = dv.rep; |
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177 rep->count++; |
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178 } |
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179 |
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180 return *this; |
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181 } |
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182 |
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183 ~dim_vector (void) |
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184 { |
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185 if (--rep->count <= 0) |
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186 delete rep; |
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187 } |
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188 |
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189 int length (void) const { return rep->length (); } |
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190 |
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191 int& elem (int i) { make_unique (); return rep->elem (i); } |
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192 |
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193 int elem (int i) const { return rep->elem (i); } |
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194 |
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195 int& operator () (int i) { return elem (i); } |
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196 |
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197 int operator () (int i) const { return elem (i); } |
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198 |
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199 void resize (int n, int fill_value = 0) |
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200 { |
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201 int len = length (); |
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202 |
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203 if (n != len) |
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204 { |
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205 dim_vector_rep *old_rep = rep; |
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206 |
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207 rep = new dim_vector_rep (n, old_rep, fill_value); |
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208 |
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209 if (--old_rep->count <= 0) |
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210 delete old_rep; |
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211 } |
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212 } |
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213 |
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214 std::string str (char sep = 'x') const |
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215 { |
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216 OSSTREAM buf; |
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217 |
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218 for (int i = 0; i < length (); i++) |
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219 { |
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220 buf << elem (i); |
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221 |
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222 if (i < length () - 1) |
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223 buf << sep; |
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224 } |
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225 |
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226 buf << OSSTREAM_ENDS; |
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227 |
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228 std::string retval = OSSTREAM_STR (buf); |
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229 |
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230 OSSTREAM_FREEZE (buf); |
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231 |
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232 return retval; |
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233 } |
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234 |
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235 bool all_zero (void) const |
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236 { |
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237 bool retval = true; |
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238 |
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239 for (int i = 0; i < length (); i++) |
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240 { |
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241 if (elem (i) != 0) |
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242 { |
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243 retval = false; |
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244 break; |
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245 } |
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246 } |
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247 |
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248 return retval; |
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249 } |
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250 |
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251 bool any_zero (void) const |
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252 { |
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253 bool retval = false; |
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254 |
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255 for (int i = 0; i < length (); i++) |
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256 { |
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257 if (elem (i) == 0) |
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258 { |
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259 retval = true; |
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260 break; |
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261 } |
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262 } |
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263 |
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264 return retval; |
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265 } |
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266 |
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267 int |
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268 num_ones (void) const |
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269 { |
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270 int retval = 0; |
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271 |
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272 for (int i = 0; i < length (); i++) |
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273 if (elem (i) == 1) |
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274 retval++; |
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275 |
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276 return retval; |
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277 } |
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278 |
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279 bool |
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280 all_ones (void) const |
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281 { |
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282 return (num_ones () == length ()); |
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283 } |
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284 |
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285 // This is the number of elements that a matrix with this dimension |
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286 // vector would have, NOT the number of dimensions (elements in the |
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287 // dimension vector). |
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288 |
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289 int numel (void) const |
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290 { |
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291 int n_dims = length (); |
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292 |
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293 int retval = n_dims > 0 ? elem (0) : 0; |
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294 |
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295 for (int i = 1; i < n_dims; i++) |
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296 retval *= elem (i); |
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297 |
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298 return retval; |
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299 } |
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300 |
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301 void chop_trailing_singletons (void) |
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302 { |
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303 make_unique (); |
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304 rep->chop_trailing_singletons (); |
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305 } |
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306 |
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307 dim_vector squeeze (void) const |
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308 { |
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309 dim_vector new_dims = *this; |
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310 |
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311 bool dims_changed = 1; |
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312 |
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313 int k = 0; |
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314 |
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315 for (int i = 0; i < length (); i++) |
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316 { |
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317 if (elem (i) == 1) |
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318 dims_changed = true; |
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319 else |
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320 new_dims(k++) = elem (i); |
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321 } |
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322 |
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323 if (dims_changed) |
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324 { |
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325 if (k == 0) |
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326 new_dims = dim_vector (1, 1); |
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327 else if (k == 1) |
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328 { |
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329 // There is one non-singleton dimension, so we need |
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330 // to decide the correct orientation. |
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331 |
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332 if (elem (0) == 1) |
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333 { |
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334 // The original dimension vector had a leading |
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335 // singleton dimension. |
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336 |
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337 int tmp = new_dims(0); |
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338 |
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339 new_dims.resize (2); |
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340 |
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341 new_dims(0) = 1; |
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342 new_dims(1) = tmp; |
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343 } |
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344 else |
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345 { |
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346 // The first element of the original dimension vector |
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347 // was not a singleton dimension. |
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348 |
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349 new_dims.resize (2); |
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350 |
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351 new_dims(1) = 1; |
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352 } |
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353 } |
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354 else |
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355 new_dims.resize(k); |
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356 } |
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357 |
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358 return new_dims; |
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359 } |
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360 }; |
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361 |
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362 static inline bool |
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363 operator == (const dim_vector& a, const dim_vector& b) |
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364 { |
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365 bool retval = true; |
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366 |
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367 int a_len = a.length (); |
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368 int b_len = b.length (); |
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369 |
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370 if (a_len != b_len) |
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371 retval = false; |
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372 else |
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373 { |
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374 for (int i = 0; i < a_len; i++) |
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375 { |
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376 if (a(i) != b(i)) |
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377 { |
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378 retval = false; |
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379 break; |
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380 } |
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381 } |
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382 } |
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383 |
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384 return retval; |
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385 } |
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386 |
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387 static inline bool |
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388 operator != (const dim_vector& a, const dim_vector& b) |
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389 { |
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390 return ! operator == (a, b); |
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391 } |
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392 |
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393 #endif |
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394 |
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395 /* |
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396 ;;; Local Variables: *** |
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397 ;;; mode: C++ *** |
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398 ;;; End: *** |
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399 */ |
