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1 // Map.h -*- C++ -*- |
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2 /* |
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3 |
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4 Copyright (C) 1992, 1993, 1994, 1995 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, 675 Mass Ave, Cambridge, MA 02139, USA. |
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21 |
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22 */ |
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23 |
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24 /* |
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25 |
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26 The classes in this file are derived from the old `genclass' versions |
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27 of Map and CHMap from libg++, originally: |
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28 |
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29 Copyright (C) 1988 Free Software Foundation |
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30 written by Doug Lea (dl@rocky.oswego.edu) |
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31 |
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32 and distributed under the terms of the GNU Library General Public |
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33 License as published by the Free Software Foundation. |
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34 |
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35 */ |
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36 |
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37 #if ! defined (octave_Map_h) |
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38 #define octave_Map_h 1 |
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39 |
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40 #include <Pix.h> |
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41 |
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42 #include "utils.h" |
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43 |
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44 template <class C> |
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45 class Map |
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46 { |
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47 protected: |
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48 int count; |
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49 C def; |
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50 |
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51 public: |
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52 Map (const C& dflt) : def (dflt) { count = 0; } |
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53 |
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54 virtual ~Map (void) { } |
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55 |
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56 int length (void) const { return count; } // current number of items |
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57 int empty (void) const { return count == 0; } |
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58 |
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59 virtual int contains (const char *key) const; // is key mapped? |
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60 |
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61 virtual void clear (void); // delete all items |
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62 |
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63 virtual C& operator [] (const char *key) = 0; // access contents by key |
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64 |
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65 virtual void del (const char *key) = 0; // delete entry |
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66 |
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67 virtual Pix first (void) const = 0; // Pix of first item or 0 |
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68 virtual void next (Pix& i) const = 0; // advance to next or 0 |
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69 virtual const char *key (Pix i) const = 0; // access key at i |
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70 virtual C& contents (Pix i) const = 0; // access contents at i |
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71 |
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72 virtual int owns (Pix i) const; // is i a valid Pix ? |
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73 virtual Pix seek (const char *key) const; // Pix of key |
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74 |
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75 C& dflt (void) { return def; } // access default val |
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76 |
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77 void error (const char* msg) const; |
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78 |
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79 virtual int OK (void) const = 0; // rep invariant |
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80 }; |
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81 |
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82 template <class C> |
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83 struct CHNode |
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84 { |
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85 CHNode *tl; |
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86 char *hd; |
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87 C cont; |
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88 |
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89 CHNode (void) : tl (0), hd (0) { } |
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90 |
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91 CHNode (const char *h, const C& c, CHNode *t = 0) |
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92 : tl (t), cont (c) |
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93 { hd = strsave (h); } |
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94 |
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95 ~CHNode (void) |
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96 { delete [] hd; } |
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97 }; |
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98 |
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99 #ifndef DEFAULT_INITIAL_CAPACITY |
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100 #define DEFAULT_INITIAL_CAPACITY 8 |
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101 #endif |
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102 |
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103 template <class C> |
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104 class CHMap : public Map<C> |
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105 { |
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106 protected: |
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107 CHNode<C> **tab; |
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108 unsigned int size; |
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109 |
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110 public: |
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111 CHMap (const C& dflt, unsigned int sz = DEFAULT_INITIAL_CAPACITY); |
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112 |
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113 CHMap (const CHMap& a); |
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114 |
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115 ~CHMap (void) |
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116 { |
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117 clear (); |
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118 delete tab; |
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119 } |
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120 |
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121 C& operator [] (const char *key); |
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122 |
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123 void del (const char *key); |
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124 |
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125 Pix first (void) const; |
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126 void next (Pix& i) const; |
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127 |
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128 const char *key (Pix p) const |
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129 { |
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130 if (p == 0) |
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131 error ("null Pix"); |
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132 |
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133 return ((CHNode<C> *) p)->hd; |
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134 } |
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135 |
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136 C& contents (Pix p) const |
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137 { |
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138 if (p == 0) |
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139 error ("null Pix"); |
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140 |
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141 return ((CHNode<C> *) p)->cont; |
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142 } |
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143 |
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144 Pix seek (const char *key) const; |
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145 |
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146 int contains (const char *key) const |
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147 { |
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148 return seek (key) != 0; |
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149 } |
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150 |
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151 void clear (void); |
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152 int OK (void) const; |
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153 }; |
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154 |
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155 #endif |
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156 |
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157 /* |
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158 ;;; Local Variables: *** |
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159 ;;; mode: C++ *** |
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160 ;;; page-delimiter: "^/\\*" *** |
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161 ;;; End: *** |
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162 */ |
