1 | // |
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2 | // TypeChecks.h |
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3 | // |
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4 | // $Id: //poco/1.3/Foundation/include/Poco/MetaProgramming.h#1 $ |
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5 | // |
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6 | // Library: Foundation |
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7 | // Package: Core |
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8 | // Module: MetaProgramming |
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9 | // |
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10 | // Common definitions useful for Meta Template Programming |
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11 | // |
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12 | // Copyright (c) 2006, Applied Informatics Software Engineering GmbH. |
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13 | // and Contributors. |
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14 | // |
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15 | // Permission is hereby granted, free of charge, to any person or organization |
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16 | // obtaining a copy of the software and accompanying documentation covered by |
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17 | // this license (the "Software") to use, reproduce, display, distribute, |
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18 | // execute, and transmit the Software, and to prepare derivative works of the |
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19 | // Software, and to permit third-parties to whom the Software is furnished to |
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20 | // do so, all subject to the following: |
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21 | // |
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22 | // The copyright notices in the Software and this entire statement, including |
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23 | // the above license grant, this restriction and the following disclaimer, |
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24 | // must be included in all copies of the Software, in whole or in part, and |
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25 | // all derivative works of the Software, unless such copies or derivative |
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26 | // works are solely in the form of machine-executable object code generated by |
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27 | // a source language processor. |
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28 | // |
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29 | // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR |
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30 | // IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, |
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31 | // FITNESS FOR A PARTICULAR PURPOSE, TITLE AND NON-INFRINGEMENT. IN NO EVENT |
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32 | // SHALL THE COPYRIGHT HOLDERS OR ANYONE DISTRIBUTING THE SOFTWARE BE LIABLE |
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33 | // FOR ANY DAMAGES OR OTHER LIABILITY, WHETHER IN CONTRACT, TORT OR OTHERWISE, |
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34 | // ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER |
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35 | // DEALINGS IN THE SOFTWARE. |
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36 | // |
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37 | |
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38 | |
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39 | #ifndef Foundation_TypeChecks_INCLUDED |
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40 | #define Foundation_TypeChecks_INCLUDED |
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41 | |
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42 | |
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43 | #include "Poco/Foundation.h" |
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44 | |
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45 | |
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46 | namespace Poco { |
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47 | |
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48 | |
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49 | template <typename T> |
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50 | struct IsReference |
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51 | ///Use this struct to determine if a template type is a reference |
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52 | { |
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53 | enum |
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54 | { |
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55 | VALUE = 0 |
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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 | template <typename T> |
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61 | struct IsReference<T&> |
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62 | { |
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63 | enum |
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64 | { |
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65 | VALUE = 1 |
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66 | }; |
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67 | }; |
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68 | |
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69 | |
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70 | template <typename T> |
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71 | struct IsReference<const T&> |
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72 | { |
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73 | enum |
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74 | { |
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75 | VALUE = 1 |
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76 | }; |
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77 | }; |
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78 | |
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79 | |
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80 | |
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81 | template <typename T> |
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82 | struct IsConst |
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83 | ///Use this struct to determine if a template type is a const type |
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84 | { |
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85 | enum |
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86 | { |
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87 | VALUE = 0 |
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88 | }; |
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89 | }; |
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90 | |
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91 | |
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92 | template <typename T> |
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93 | struct IsConst<const T&> |
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94 | { |
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95 | enum |
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96 | { |
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97 | VALUE = 1 |
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98 | }; |
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99 | }; |
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100 | |
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101 | |
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102 | template <typename T> |
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103 | struct IsConst<const T> |
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104 | { |
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105 | enum |
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106 | { |
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107 | VALUE = 1 |
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108 | }; |
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109 | }; |
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110 | |
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111 | |
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112 | template <typename T> |
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113 | struct TypeWrapper |
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114 | /// Use the type wrapper if you want to dedecouple constness and references from template types |
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115 | { |
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116 | typedef T TYPE; |
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117 | typedef const T CONSTTYPE; |
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118 | typedef T& REFTYPE; |
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119 | typedef const T& CONSTREFTYPE; |
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120 | }; |
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121 | |
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122 | |
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123 | template <typename T> |
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124 | struct TypeWrapper<const T> |
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125 | { |
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126 | typedef T TYPE; |
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127 | typedef const T CONSTTYPE; |
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128 | typedef T& REFTYPE; |
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129 | typedef const T& CONSTREFTYPE; |
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130 | }; |
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131 | |
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132 | |
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133 | template <typename T> |
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134 | struct TypeWrapper<const T&> |
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135 | { |
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136 | typedef T TYPE; |
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137 | typedef const T CONSTTYPE; |
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138 | typedef T& REFTYPE; |
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139 | typedef const T& CONSTREFTYPE; |
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140 | }; |
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141 | |
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142 | |
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143 | template <typename T> |
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144 | struct TypeWrapper<T&> |
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145 | { |
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146 | typedef T TYPE; |
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147 | typedef const T CONSTTYPE; |
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148 | typedef T& REFTYPE; |
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149 | typedef const T& CONSTREFTYPE; |
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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 | } // namespace Poco |
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155 | |
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156 | |
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157 | #endif |
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