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1 /* |
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3 Copyright (C) 1996, 1997 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_tree_const_h) |
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24 #define octave_tree_const_h 1 |
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25 |
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26 #if defined (__GNUG__) |
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27 #pragma interface |
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28 #endif |
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29 |
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30 #include <string> |
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31 |
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32 class ostream; |
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33 |
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34 #include "oct-alloc.h" |
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35 |
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36 #include "pt-fvc.h" |
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37 |
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38 class octave_value_list; |
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39 |
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40 class tree_walker; |
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41 |
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42 #include "ov.h" |
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43 |
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44 class |
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45 tree_constant : public tree_fvc |
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46 { |
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47 public: |
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48 |
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49 tree_constant (int l = -1, int c = -1) |
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50 : tree_fvc (l, c), val (), orig_text () { } |
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51 |
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52 tree_constant (const octave_value& v, int l = -1, int c = -1) |
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53 : tree_fvc (l, c), val (v), orig_text () { } |
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54 |
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55 tree_constant (const tree_constant& a) |
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56 : tree_fvc (), val (a.val), orig_text () { } |
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57 |
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58 ~tree_constant (void) { } |
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59 |
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60 tree_constant& operator = (const tree_constant& a) |
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61 { |
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62 if (this != &a) |
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63 { |
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64 tree_fvc::operator = (a); |
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65 val = a.val; |
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66 } |
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67 return *this; |
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68 } |
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69 |
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70 void *operator new (size_t size) |
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71 { return allocator.alloc (size); } |
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72 |
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73 void operator delete (void *p, size_t size) |
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74 { allocator.free (p, size); } |
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75 |
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76 // Indexed assignment. |
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77 |
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78 octave_value index (const octave_value_list& idx) const |
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79 { return val.index (idx); } |
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80 |
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81 octave_value& reference (void) |
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82 { |
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83 val.make_unique (); |
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84 return val; |
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85 } |
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86 |
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87 octave_value value (void) const |
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88 { return val; } |
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89 |
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90 octave_value assign (octave_value::assign_op op, |
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91 const octave_value_list& idx, |
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92 const octave_value& rhs) |
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93 { |
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94 val.assign (op, idx, rhs); |
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95 return val; |
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96 } |
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97 |
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98 // Type. It would be nice to eliminate the need for this. |
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99 |
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100 bool is_constant (void) const { return true; } |
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101 |
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102 void maybe_mutate (void) |
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103 { val.maybe_mutate (); } |
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104 |
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105 void print (ostream& os, bool pr_as_read_syntax = false, |
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106 bool pr_orig_txt = true); |
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107 |
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108 octave_value eval (bool print = false); |
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109 |
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110 octave_value_list eval (bool, int, const octave_value_list&); |
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111 |
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112 // Store the original text corresponding to this constant for later |
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113 // pretty printing. |
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114 |
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115 void stash_original_text (const string& s) |
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116 { orig_text = s; } |
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117 |
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118 string original_text (void) const |
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119 { return orig_text; } |
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120 |
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121 void accept (tree_walker& tw); |
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122 |
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123 private: |
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124 |
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125 // For custom memory management. |
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126 static octave_allocator allocator; |
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127 |
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128 // The actual value that this constant refers to. |
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129 octave_value val; |
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130 |
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131 // The original text form of this constant. |
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132 string orig_text; |
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133 }; |
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134 |
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135 #endif |
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136 |
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137 /* |
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138 ;;; Local Variables: *** |
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139 ;;; mode: C++ *** |
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140 ;;; End: *** |
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141 */ |
