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annotate d2/qtd/meta/Runtime.d @ 382:1d56b2a2e10c

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Fixes to debugging stuff. Added size_t as primitive type to workaround Qwt build failure in debug
author Max Samukha <maxter@spambox.com>
date Mon, 12 Jul 2010 20:36:07 +0300
parents a032df77b6ab
children
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1 /**************************************************************************
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2 Copyright: Copyright Max Samukha, 2010
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3 Authors: Max Samukha
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4 License: Boost Software License 1.0
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5 **************************************************************************/
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6 module qtd.meta.Runtime;
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7
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8 import
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9 qtd.meta.Compiletime,
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10
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11 std.typetuple,
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12 std.conv,
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13 std.stdio,
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14 std.traits,
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15 std.variant;
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16
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17 import std.range : isForwardRange, isRandomAccessRange;
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18
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19 /**
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20 Object to lock on when accessing thread-shared meta-objects.
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21 */
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22 immutable Object metaLock;
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23 shared static this()
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24 {
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25 metaLock = cast(immutable)new Object;
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26 }
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27
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28 /**
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29 IDs of the built-in basic types.
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30 */
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31 enum BasicTypeId
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32 {
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33 ///
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34 void_,
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35 ///
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36 bool_,
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37 ///
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38 byte_,
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39 ///
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40 ubyte_,
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41 ///
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42 short_,
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43 ///
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44 ushort_,
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45 ///
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46 int_,
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47 ///
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48 uint_,
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49 ///
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50 long_,
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51 ///
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52 ulong_,
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53 ///
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54 cent_,
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55 ///
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56 ucent_,
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57 ///
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58 float_,
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59 ///
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60 double_,
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61 ///
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62 real_,
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63 ///
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64 ifloat_,
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65 ///
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66 idouble_,
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67 ///
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68 ireal_,
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69 ///
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70 cfloat_,
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71 ///
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72 cdouble_,
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73 ///
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74 creal_,
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75 ///
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76 char_,
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77 ///
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78 wchar_,
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79 ///
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80 dchar_
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81 }
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82
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83 /**
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84 Thrown on meta-system errors.
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85 */
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86 class MetaException : Exception
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87 {
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88 this(string msg)
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89 {
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90 super(msg);
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91 }
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92 }
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93
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94 /**
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95 All meta-object classes inherit from this base class.
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96 */
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97 abstract class MetaBase
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98 {
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99 alias typeof(this) This;
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100
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101 string name;
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102 MetaAttribute[] attributes;
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103
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104 protected MetaBase[] members_;
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105
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106 template createImpl(M : This)
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107 {
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108 static M createImpl(alias symbol)()
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109 {
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110 auto m = new M;
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111 m.construct!symbol;
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112 return m;
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113 }
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114 }
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115
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116 private void createAttrs(alias symbol)()
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117 {
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118 alias GetAttributes!symbol attrs;
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119 enum len = attrs.length; // COMPILER BUG
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120 foreach (i, _; Repeat!(void, len))
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121 {
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122 alias TypeTuple!(attrs[i].tuple) attr;
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123 // if the third element of the attribute data is a MetaAttribute subclass,
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124 // use that to create the attribute instance.
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125 static if (attr.length > 2 && (is(attr[2] : MetaAttribute)))
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126 {
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127 alias attr[2] MA;
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128 alias TypeTuple!(attr[0..2], attr[3..$]) args;
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129 attributes ~= MA /*COMPILER BUG: tuple element as tuple*/[0].create(args);
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130 }
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131 }
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132 }
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133
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134 protected void construct(alias symbol)()
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135 {
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136 name = symbol.stringof;
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137 createAttrs!symbol;
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138 }
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139
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140 static struct MembersRange
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141 {
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142 private MetaBase[] members_;
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143
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144 @property
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145 MetaBase front()
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146 {
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147 return members_[0];
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148 }
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149
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150 @property
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151 bool empty()
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152 {
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153 return members_.length == 0;
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154 }
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155
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156 @property
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157 MembersRange save()
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158 {
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159 return this;
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160 }
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161
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162 @property
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163 MetaBase back()
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164 {
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165 return members_[$ - 1];
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166 }
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167
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168 void popFront()
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169 {
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170 members_ = members_[1..$];
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171 }
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172
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173 void popBack()
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174 {
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175 members_ = members_[0..$ - 1];
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176 }
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177
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178 MetaBase opIndex(size_t i)
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179 {
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180 return members_[i];
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181 }
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182
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183 @property
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184 size_t length()
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185 {
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186 return members_.length;
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187 }
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188 }
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189
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190 /**
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191 Returns a random access range of members of the class described by this meta-object.
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192 */
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193 @property
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194 MembersRange members()
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195 {
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196 return MembersRange(members_);
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197 }
351
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198 }
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199
368
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200 version (QtdUnittest) unittest
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201 {
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202 static assert(isRandomAccessRange!(MetaBase.MembersRange));
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203 }
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204
351
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205 /**
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206 Base class for run-time attributes.
351
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207 */
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208 abstract class MetaAttribute
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209 {
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210 string name;
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211 AttributeOptions options;
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212
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213 this(string name, AttributeOptions opts)
351
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214 {
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215 this.name = name;
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216 options = opts;
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217 }
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218 }
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219
368
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220 abstract class MetaType : MetaBase
351
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221 {
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222 }
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223
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224 abstract class MetaAggregate : MetaType
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225 {
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226 }
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227
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228 class MetaClass : MetaAggregate
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229 {
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230 alias typeof(this) This;
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231
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232 private
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233 {
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234 This base_;
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235 This firstDerived_;
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236 This next_;
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237 ClassInfo classInfo_;
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238 }
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239
365
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240 alias createImpl!This create;
368
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241
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242 static struct AllMembersRange
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243 {
372
a032df77b6ab Simple debug helper. Unittests. Meta-object for polymorphic non-QObjects
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244 private
368
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245 {
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246 This metaClass_;
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247 MetaBase[] members_;
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248
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249 void skipEmpty()
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250 {
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251 while (!metaClass_.members_.length)
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252 {
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253 metaClass_ = metaClass_.base_;
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254 if (!metaClass_)
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255 return;
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256 }
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257
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258 members_ = metaClass_.members_;
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259 }
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260 }
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261
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262 this(This metaClass)
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263 {
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264 metaClass_ = metaClass;
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265 skipEmpty();
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266 }
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267
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268 @property
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269 MetaBase front()
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270 {
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271 return members_[0];
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272 }
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273
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274 @property
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275 bool empty()
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276 {
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277 return members_.length == 0;
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278 }
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279
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280 @property
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281 AllMembersRange save()
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282 {
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283 return this;
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284 }
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285
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286 void popFront()
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287 {
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288 members_ = members_[1..$];
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289 if (!members_.length)
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290 {
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291 metaClass_ = metaClass_.base_;
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292 if (metaClass_)
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293 skipEmpty();
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294 }
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295 }
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296 }
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297
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298 /**
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299 Returns a forward range of members of the class described by this meta-object,
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300 including base class members.
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301 */
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302 @property
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303 AllMembersRange allMembers()
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304 {
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305 return AllMembersRange(this);
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306 }
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307
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308 /**
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309 Returns the meta-object of the base class.
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310 */
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311 @property
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312 This base()
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313 {
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314 return base_;
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315 }
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316
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317 /**
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318 Returns the next meta-object on this level of the inheritance hierarchy.
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319 */
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320 @property
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321 This next()
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322 {
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323 return next_;
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324 }
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325
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326 /**
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327 Returns the meta-object for the first derived class.
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328 */
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329 @property
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330 This firstDerived()
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331 {
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332 return firstDerived_;
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333 }
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334
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335 /**
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336 D class info.
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337 */
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338 @property
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339 ClassInfo classInfo()
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340 {
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341 return classInfo_;
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342 }
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343
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344
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345 /* internal */ void construct(T : Object)()
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346 {
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347 super.construct!T();
372
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348 classInfo_ = T.classinfo;
368
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349 static if (!is(T == Object))
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350 {
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351 alias BaseClassesTuple!(T)[0] Base;
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352 base_ = meta!Base;
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353
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354 next_ = base_.firstDerived_;
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355 base_.firstDerived_ = this;
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356 }
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357 }
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358
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359 /**
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360 */
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361 override string toString() const
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362 {
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363 return "MetaClass for " ~ classInfo_.name;
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364 }
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365 }
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366
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367 version (QtdUnittest) unittest
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368 {
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369 static assert (isForwardRange!(MetaClass.AllMembersRange));
351
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370 }
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371
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372 class MetaStruct : MetaAggregate
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373 {
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374 alias typeof(this) This;
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375 alias createImpl!This create;
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376 }
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377
368
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378 /**
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379 */
351
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380 @property
368
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381 M meta(alias symbol, M : MetaBase)()
351
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382 {
368
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383 __gshared static M sharedM;
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384 static M m;
365
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385
368
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386 if (!m)
365
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387 {
368
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388 synchronized(metaLock)
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389 {
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390 if (!sharedM)
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391 sharedM = M.create!symbol;
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392 }
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393 m = sharedM;
365
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394 }
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395
351
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396 return m;
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397 }
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398
368
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399 /**
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400 */
351
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401 // only classes and structs for now
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402 @property
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403 auto meta(T)()
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404 {
368
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405 static if (is(T.Meta))
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406 return meta!(T, T.Meta);
351
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407 else static if (is(T == class))
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408 return meta!(T, MetaClass);
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409 else static if (is(T == struct))
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410 return meta!(T, MetaStruct);
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411 else
368
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412 static assert(false, "No meta-object for symbol " ~ T.stringof);
351
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413 }
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414
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415 /**
368
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416 A run-time attribute implementation that stores the attribute data in an
351
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417 array of variants.
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418 */
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419 class MetaVariantAttribute : MetaAttribute
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420 {
368
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421 alias typeof(this) This;
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422
351
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423 Variant[] values;
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424
368
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425 private this(string name, AttributeOptions opts)
351
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426 {
368
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427 super(name, opts);
351
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428 }
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429
372
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430 static MetaVariantAttribute create(A...)(string name, AttributeOptions opts, A args)
351
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431 {
368
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432 auto ret = new This(name, opts);
372
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433
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434 foreach(i, _; A)
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435 ret.values ~= Variant(args[i]);
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436
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437 return ret;
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438 }
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439 }
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440
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441 /**
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442 A run-time attribute implementation that stores the attribute data in an
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443 assiciative array of variants.
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444 */
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445 class MetaVariantDictAttribute : MetaAttribute
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446 {
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447 Variant[string] values;
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448 alias typeof(this) This;
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449
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450 private this(string name, AttributeOptions opts)
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451 {
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452 super(name, opts);
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453 }
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454
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455 static This create(A...)(string name, AttributeOptions opts, A args)
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456 {
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457 auto ret = new This(name, opts);
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458 foreach(i, _; A)
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459 ret.values[args[i]] = Variant(args[i + 1]); // PHOBOS BUG: phobos asserts on this
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460
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461 return ret;
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462 }
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463 }
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464
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465 version(QtdUnittest) unittest
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466 {
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467 enum x = 42;
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468 static void foo() {}
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469
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470 static class C
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471 {
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472
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473 mixin InnerAttribute!("variantAttribute", MetaVariantAttribute, "22", x, 33);
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474
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475 /+ PHOBOS BUG: variant is unusable with AAs
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476 mixin InnerAttribute!("variantDictAttribute", MetaVariantDictAttribute,
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477 "a", "33",
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478 "b", 44,
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479 "c", x
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480 );
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481 +/
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482 }
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483
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484 auto attrs = meta!(C).attributes;
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485 assert(attrs.length == 1);
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486 auto attr = cast(MetaVariantAttribute)attrs[0];
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487
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488 assert(attr.name == "variantAttribute");
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489 assert(attr.values[0] == "22");
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490 assert(attr.values[1] == x);
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491 assert(attr.values[2] == 33);
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492
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493 /+
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494
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495 auto attr2 = cast(MetaVariantDictAttribute) attrs[1];
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496 assert(attr2.name == "variantDictAttribute");
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497 //assert(attr2.values["a"] == "33");
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498 //assert(attr2.values["b"] == 44);
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499 //assert(attr2.values["c"] == x);
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500 +/
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501 }