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1 /* |
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2 |
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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_lvalue_h) |
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24 #define octave_lvalue_h 1 |
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25 |
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26 class octave_value; |
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27 class octave_value_list; |
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28 |
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29 #include <string> |
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30 |
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31 #include "SLList.h" |
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32 |
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33 #include "oct-obj.h" |
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34 #include "pt-idx.h" |
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35 #include "symtab.h" |
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36 |
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37 // XXX FIXME XXX -- eliminate the following kluge? |
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38 |
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39 // This variable is used when creating dummy octave_lvalue objects. |
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40 static octave_value dummy_val; |
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41 |
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42 class |
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43 octave_lvalue |
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44 { |
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45 public: |
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46 |
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47 octave_lvalue (octave_value *v = &dummy_val, |
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48 symbol_record::change_function f = 0) |
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49 : val (v), type (), idx (), chg_fcn (f), index_set (false) { } |
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50 |
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51 octave_lvalue (const octave_lvalue& vr) |
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52 : val (vr.val), type (vr.type), idx (vr.idx), chg_fcn (vr.chg_fcn), |
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53 index_set (vr.index_set) { } |
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54 |
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55 octave_lvalue& operator = (const octave_lvalue& vr) |
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56 { |
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57 if (this != &vr) |
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58 { |
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59 val = vr.val; |
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60 type = vr.type; |
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61 idx = vr.idx; |
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62 chg_fcn = vr.chg_fcn; |
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63 index_set = vr.index_set; |
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64 } |
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65 |
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66 return *this; |
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67 } |
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68 |
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69 ~octave_lvalue (void) { } |
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70 |
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71 bool is_defined (void) { return val->is_defined (); } |
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72 |
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73 bool is_undefined (void) { return val->is_undefined (); } |
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74 |
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75 bool is_map (void) { return val->is_map (); } |
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76 |
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77 void define (const octave_value& v) { *val = v; } |
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78 |
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79 void assign (octave_value::assign_op, const octave_value&); |
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80 |
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81 void set_index (const std::string& t, const SLList<octave_value_list>& i); |
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82 |
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83 void clear_index (void) { type = std::string (); idx.clear (); } |
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84 |
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85 void do_unary_op (octave_value::unary_op op); |
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86 |
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87 octave_value value (void) |
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88 { return idx.empty () ? *val : val->subsref (type, idx); } |
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89 |
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90 private: |
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91 |
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92 octave_value *val; |
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93 |
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94 std::string type; |
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95 |
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96 SLList<octave_value_list> idx; |
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97 |
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98 symbol_record::change_function chg_fcn; |
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99 |
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100 bool index_set; |
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101 }; |
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102 |
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103 #endif |
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104 |
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105 /* |
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106 ;;; Local Variables: *** |
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107 ;;; mode: C++ *** |
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108 ;;; End: *** |
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109 */ |
