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132
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1 /**
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2 * The traits module defines tools useful for obtaining detailed type
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3 * information at compile-time.
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4 *
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5 * Copyright: Copyright (C) 2005-2006 Sean Kelly. All rights reserved.
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6 * License: BSD style: $(LICENSE)
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7 * Authors: Sean Kelly
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8 */
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9 module tango.core.Traits;
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10
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11
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12 /**
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13 *
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14 */
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15 template isCharType( T )
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16 {
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17 const bool isCharType = is( T == char ) ||
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18 is( T == wchar ) ||
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19 is( T == dchar );
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20 }
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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 template isSignedIntegerType( T )
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27 {
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28 const bool isSignedIntegerType = is( T == byte ) ||
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29 is( T == short ) ||
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30 is( T == int ) ||
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31 is( T == long )/+||
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32 is( T == cent )+/;
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33 }
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34
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35
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36 /**
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37 *
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38 */
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39 template isUnsignedIntegerType( T )
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40 {
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41 const bool isUnsignedIntegerType = is( T == ubyte ) ||
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42 is( T == ushort ) ||
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43 is( T == uint ) ||
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44 is( T == ulong )/+||
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45 is( T == ucent )+/;
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46 }
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47
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48
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49 /**
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50 *
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51 */
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52 template isIntegerType( T )
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53 {
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54 const bool isIntegerType = isSignedIntegerType!(T) ||
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55 isUnsignedIntegerType!(T);
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56 }
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57
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58
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59 /**
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60 *
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61 */
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62 template isRealType( T )
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63 {
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64 const bool isRealType = is( T == float ) ||
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65 is( T == double ) ||
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66 is( T == real );
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67 }
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68
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69
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70 /**
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71 *
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72 */
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73 template isComplexType( T )
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74 {
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75 const bool isComplexType = is( T == cfloat ) ||
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76 is( T == cdouble ) ||
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77 is( T == creal );
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78 }
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79
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80
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81 /**
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82 *
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83 */
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84 template isImaginaryType( T )
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85 {
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86 const bool isImaginaryType = is( T == ifloat ) ||
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87 is( T == idouble ) ||
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88 is( T == ireal );
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89 }
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90
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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 template isFloatingPointType( T )
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96 {
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97 const bool isFloatingPointType = isRealType!(T) ||
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98 isComplexType!(T) ||
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99 isImaginaryType!(T);
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100 }
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101
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102
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103 /**
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104 *
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105 */
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106 template isPointerType( T )
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107 {
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108 const bool isPointerType = is( typeof(*T) );
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109 }
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110
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111
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112 /**
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113 *
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114 */
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115 template isReferenceType( T )
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116 {
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117
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118 const bool isReferenceType = isPointerType!(T) ||
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119 is( T == class ) ||
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120 is( T == interface ) ||
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121 is( T == delegate );
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122 }
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123
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124
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125 /**
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126 *
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127 */
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128 template isDynamicArrayType( T )
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129 {
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130 const bool isDynamicArrayType = is( typeof(T.init[0])[] == T );
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131 }
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132
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133
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134 /**
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135 *
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136 */
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137 template isStaticArrayType( T )
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138 {
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139 const bool isStaticArrayType = is( typeof(T.init)[(T).sizeof / typeof(T.init).sizeof] == T );
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140 }
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141
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142
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143 /**
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144 *
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145 */
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146 private template isAssocArrayType( T )
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147 {
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148 const bool isAssocArrayType = is( typeof(T.init.values[0])[typeof(T.init.keys[0])] == T );
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149 }
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150
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151
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152 /**
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153 *
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154 */
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155 template isCallableType( T )
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156 {
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157 const bool isCallableType = is( T == function ) ||
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158 is( typeof(*T) == function ) ||
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159 is( T == delegate ) ||
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160 is( typeof(T.opCall) == function );
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161 }
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162
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163
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164 /**
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165 *
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166 */
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167 template ReturnTypeOf( Fn )
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168 {
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169 static if( is( Fn Ret == return ) )
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170 alias Ret ReturnTypeOf;
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171 else
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172 static assert( false, "Argument has no return type." );
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173 }
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174
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175
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176 /**
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177 *
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178 */
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179 template ReturnTypeOf( alias fn )
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180 {
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181 alias ReturnTypeOf!(typeof(fn)) ReturnTypeOf;
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182 }
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183
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184
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185 /**
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186 *
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187 */
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188 template ParameterTupleOf( Fn )
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189 {
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190 static if( is( Fn Params == function ) )
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191 alias Params ParameterTupleOf;
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192 else static if( is( Fn Params == delegate ) )
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193 alias ParameterTupleOf!(Params) ParameterTupleOf;
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194 else static if( is( Fn Params == Params* ) )
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195 alias ParameterTupleOf!(Params) ParameterTupleOf;
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196 else
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197 static assert( false, "Argument has no parameters." );
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198 }
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199
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200
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201 /**
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202 *
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203 */
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204 template ParameterTupleOf( alias fn )
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205 {
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206 alias ParameterTupleOf!(typeof(fn)) ParameterTupleOf;
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207 }
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208
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209
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210 /**
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211 *
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212 */
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213 template BaseTypeTupleOf( T )
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214 {
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215 static if( is( T Base == super ) )
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216 alias Base BaseTypeTupleOf;
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217 else
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218 static assert( false, "Argument is not a class or interface." );
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219 }
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