Mercurial > projects > dang
annotate src/ast/Expr.d @ 209:42e663451371
Renamed some of the actions. Declarations now have it's own action.
author | Anders Johnsen <skabet@gmail.com> |
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date | Tue, 12 Aug 2008 19:05:17 +0200 |
parents | d3c148ca429b |
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1 module ast.Expr; |
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2 |
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3 /** |
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4 The base class for all Expressions. |
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5 */ |
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6 class Expr |
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7 { |
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8 /// Get the type of the Expr |
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9 Object getType() |
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10 { |
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11 assert(0, "Unimplemented"); |
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12 return null; |
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13 } |
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14 |
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15 /// Set the type of the Expr |
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16 void setType(Object type) |
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17 { |
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18 assert(0, "Unimplemented"); |
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19 } |
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20 |
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21 /// Returns true if the Expr can be compile-time evaluated. |
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22 bool isConstantExpr() { return false; } |
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23 |
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24 NumberLiteral asNumberLiteral() { return null; } |
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25 bool isNumberLiteral() { return false; } |
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26 |
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27 StringLiteral asStringLiteral() { return null; } |
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28 bool isStringLiteral() { return false; } |
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29 |
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30 ArrayLiteral asArrayLiteral() { return null; } |
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31 bool isArrayLiteral() { return false; } |
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32 |
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33 AssignExp asAssignExp() { return null; } |
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34 bool isAssignExp() { return false; } |
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35 |
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36 BinaryExp asBinaryExp() { return null; } |
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37 bool isBinaryExp() { return false; } |
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38 |
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39 NegateExp asNegateExp() { return null; } |
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40 bool isNegateExp() { return false; } |
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42 DerefExp asDerefExp() { return null; } |
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43 bool isDerefExp() { return false; } |
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45 AddressOfExp asAddressOfExp() { return null; } |
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46 bool isAddressOfExp() { return false; } |
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48 IndexExp asIndexExp() { return null; } |
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49 bool isIndexExp() { return false; } |
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50 |
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51 Identifier asIdentifier() { return null; } |
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52 bool isIdentifier() { return false; } |
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53 |
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54 Member asMember() { return null; } |
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55 bool isMember() { return false; } |
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56 |
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57 private: |
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58 /// FIXME: Add DType? here |
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59 } |
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60 |
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61 /** |
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62 NumberLiteral |
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63 */ |
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64 /// FIXME: Should there be an IntegerLiteral and FloatLiteral instead? |
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65 class NumberLiteral : Expr |
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66 { |
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67 override bool isConstantExpr() { return true; } |
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68 |
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69 override NumberLiteral asNumberLiteral() { return this; } |
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70 override bool isNumberLiteral() { return true; } |
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71 } |
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72 |
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73 /** |
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74 StringLiteral |
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75 */ |
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76 class StringLiteral : Expr |
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77 { |
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78 override bool isConstantExpr() { return true; } |
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79 |
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80 override StringLiteral asStringLiteral() { return this; } |
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81 override bool isStringLiteral() { return true; } |
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82 } |
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83 |
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84 /** |
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85 ArrayLiteral |
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86 */ |
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87 class ArrayLiteral : Expr |
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88 { |
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89 /// Return the arguments for the ArrayLiteral |
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90 Expr[] getArguments() { return arguments; } |
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91 |
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92 /// Return a given argument for the ArrayLiteral |
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93 Expr getArgument(int index) { return arguments[index]; } |
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94 |
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95 /// Get the count of arguments for the ArrayLiteral |
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96 int getArgumentCount() { return arguments.length; } |
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97 |
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98 override bool isConstantExpr() |
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99 { |
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100 /** |
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101 If all the arguments to the ArrayLiteral is an constant Expr, then |
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102 this ArrayLiteral can be considered an constant Expr aswell. |
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103 */ |
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104 // FIXME: consider if it should save the result |
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105 foreach (arg; arguments) |
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106 if (!arg.isConstantExpr()) |
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107 return false; |
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108 return true; |
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109 } |
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110 |
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111 override ArrayLiteral asArrayLiteral() { return this; } |
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112 override bool isArrayLiteral() { return true; } |
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113 |
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114 private: |
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115 Expr[] arguments; |
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116 } |
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117 |
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118 /** |
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119 The AssignExp expression contains two expression, a left and a right side, |
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120 left being a lvalue, right being a rvalue. |
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121 |
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122 If the right side ain't the same type as the left type, the right side will |
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123 try to be promoted through an implicit cast. If this failes, an error must |
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124 be given. |
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125 */ |
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126 class AssignExp : Expr |
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127 { |
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128 override AssignExp asAssignExp() { return this; } |
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129 override bool isAssignExp() { return true; } |
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130 |
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131 private: |
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132 Expr left, right; |
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133 } |
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134 |
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135 /** |
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136 BinaryExp |
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137 */ |
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138 class BinaryExp : Expr |
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139 { |
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140 override BinaryExp asBinaryExp() { return this; } |
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141 override bool isBinaryExp() { return true; } |
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142 |
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143 private: |
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144 Expr left, right; |
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145 } |
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146 |
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147 /** |
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148 NegateExp |
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149 */ |
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150 class NegateExp : Expr |
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151 { |
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152 override NegateExp asNegateExp() { return this; } |
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153 override bool isNegateExp() { return true; } |
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154 |
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155 private: |
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156 Expr expr; |
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157 } |
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158 |
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159 /** |
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160 DerefExp |
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161 */ |
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162 class DerefExp : Expr |
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163 { |
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164 override DerefExp asDerefExp() { return this; } |
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165 override bool isDerefExp() { return true; } |
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166 } |
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167 |
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168 /** |
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169 AddressOfExp |
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170 */ |
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171 class AddressOfExp : Expr |
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172 { |
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173 override AddressOfExp asAddressOfExp() { return this; } |
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174 override bool isAddressOfExp() { return true; } |
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175 } |
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176 |
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177 /** |
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178 IndexExp |
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179 */ |
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180 class IndexExp : Expr |
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181 { |
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182 override IndexExp asIndexExp() { return this; } |
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183 override bool isIndexExp() { return true; } |
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184 } |
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185 |
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186 /** |
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187 Identifier |
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188 */ |
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189 class Identifier : Expr |
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190 { |
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191 override Identifier asIdentifier() { return this; } |
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192 override bool isIdentifier() { return true; } |
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193 } |
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194 |
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195 /** |
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196 Member |
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197 */ |
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198 class Member : Expr |
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199 { |
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200 override Member asMember() { return this; } |
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201 override bool isMember() { return true; } |
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202 } |
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203 |