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4680 | right-hear | 1 | /* |
2 | * |
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3 | * Copyright (c) 1997 |
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4 | * Silicon Graphics Computer Systems, Inc. |
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5 | * |
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6 | * Permission to use, copy, modify, distribute and sell this software |
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7 | * and its documentation for any purpose is hereby granted without fee, |
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8 | * provided that the above copyright notice appear in all copies and |
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9 | * that both that copyright notice and this permission notice appear |
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10 | * in supporting documentation. Silicon Graphics makes no |
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11 | * representations about the suitability of this software for any |
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12 | * purpose. It is provided "as is" without express or implied warranty. |
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13 | */ |
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14 | |||
15 | #ifndef _CPP_BITS_TYPE_TRAITS_H |
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16 | #define _CPP_BITS_TYPE_TRAITS_H 1 |
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17 | |||
18 | #pragma GCC system_header |
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19 | |||
20 | #include |
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21 | |||
22 | /* |
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23 | This header file provides a framework for allowing compile time dispatch |
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24 | based on type attributes. This is useful when writing template code. |
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25 | For example, when making a copy of an array of an unknown type, it helps |
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26 | to know if the type has a trivial copy constructor or not, to help decide |
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27 | if a memcpy can be used. |
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28 | |||
29 | The class template __type_traits provides a series of typedefs each of |
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30 | which is either __true_type or __false_type. The argument to |
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31 | __type_traits can be any type. The typedefs within this template will |
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32 | attain their correct values by one of these means: |
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33 | 1. The general instantiation contain conservative values which work |
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34 | for all types. |
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35 | 2. Specializations may be declared to make distinctions between types. |
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36 | 3. Some compilers (such as the Silicon Graphics N32 and N64 compilers) |
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37 | will automatically provide the appropriate specializations for all |
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38 | types. |
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39 | |||
40 | EXAMPLE: |
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41 | |||
42 | //Copy an array of elements which have non-trivial copy constructors |
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43 | template |
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44 | copy(_Tp* __source,_Tp* __destination,int __n,__false_type); |
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45 | //Copy an array of elements which have trivial copy constructors. Use memcpy. |
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46 | template |
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47 | copy(_Tp* __source,_Tp* __destination,int __n,__true_type); |
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48 | |||
49 | //Copy an array of any type by using the most efficient copy mechanism |
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50 | template |
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51 | copy(__source,__destination,__n, |
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52 | typename __type_traits<_Tp>::has_trivial_copy_constructor()); |
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53 | } |
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54 | */ |
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55 | |||
56 | |||
57 | template |
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58 | typedef _Bool |
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59 | typedef _Bool |
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60 | |||
61 | template |
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62 | struct __type_traits { |
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63 | typedef __true_type this_dummy_member_must_be_first; |
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64 | /* Do not remove this member. It informs a compiler which |
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65 | automatically specializes __type_traits that this |
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66 | __type_traits template is special. It just makes sure that |
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67 | things work if an implementation is using a template |
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68 | called __type_traits for something unrelated. */ |
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69 | |||
70 | /* The following restrictions should be observed for the sake of |
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71 | compilers which automatically produce type specific specializations |
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72 | of this class: |
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73 | - You may reorder the members below if you wish |
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74 | - You may remove any of the members below if you wish |
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75 | - You must not rename members without making the corresponding |
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76 | name change in the compiler |
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77 | - Members you add will be treated like regular members unless |
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78 | you add the appropriate support in the compiler. */ |
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79 | |||
80 | |||
81 | typedef __false_type has_trivial_default_constructor; |
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82 | typedef __false_type has_trivial_copy_constructor; |
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83 | typedef __false_type has_trivial_assignment_operator; |
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84 | typedef __false_type has_trivial_destructor; |
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85 | typedef __false_type is_POD_type; |
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86 | }; |
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87 | |||
88 | |||
89 | // Provide some specializations. |
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90 | |||
91 | template<> struct __type_traits |
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92 | typedef __true_type has_trivial_default_constructor; |
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93 | typedef __true_type has_trivial_copy_constructor; |
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94 | typedef __true_type has_trivial_assignment_operator; |
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95 | typedef __true_type has_trivial_destructor; |
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96 | typedef __true_type is_POD_type; |
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97 | }; |
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98 | |||
99 | template<> struct __type_traits |
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100 | typedef __true_type has_trivial_default_constructor; |
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101 | typedef __true_type has_trivial_copy_constructor; |
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102 | typedef __true_type has_trivial_assignment_operator; |
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103 | typedef __true_type has_trivial_destructor; |
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104 | typedef __true_type is_POD_type; |
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105 | }; |
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106 | |||
107 | template<> struct __type_traits |
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108 | typedef __true_type has_trivial_default_constructor; |
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109 | typedef __true_type has_trivial_copy_constructor; |
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110 | typedef __true_type has_trivial_assignment_operator; |
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111 | typedef __true_type has_trivial_destructor; |
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112 | typedef __true_type is_POD_type; |
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113 | }; |
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114 | |||
115 | template<> struct __type_traits |
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116 | typedef __true_type has_trivial_default_constructor; |
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117 | typedef __true_type has_trivial_copy_constructor; |
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118 | typedef __true_type has_trivial_assignment_operator; |
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119 | typedef __true_type has_trivial_destructor; |
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120 | typedef __true_type is_POD_type; |
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121 | }; |
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122 | |||
123 | template<> struct __type_traits |
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124 | typedef __true_type has_trivial_default_constructor; |
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125 | typedef __true_type has_trivial_copy_constructor; |
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126 | typedef __true_type has_trivial_assignment_operator; |
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127 | typedef __true_type has_trivial_destructor; |
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128 | typedef __true_type is_POD_type; |
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129 | }; |
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130 | |||
131 | template<> struct __type_traits |
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132 | typedef __true_type has_trivial_default_constructor; |
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133 | typedef __true_type has_trivial_copy_constructor; |
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134 | typedef __true_type has_trivial_assignment_operator; |
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135 | typedef __true_type has_trivial_destructor; |
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136 | typedef __true_type is_POD_type; |
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137 | }; |
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138 | |||
139 | template<> struct __type_traits |
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140 | typedef __true_type has_trivial_default_constructor; |
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141 | typedef __true_type has_trivial_copy_constructor; |
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142 | typedef __true_type has_trivial_assignment_operator; |
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143 | typedef __true_type has_trivial_destructor; |
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144 | typedef __true_type is_POD_type; |
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145 | }; |
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146 | |||
147 | template<> struct __type_traits |
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148 | typedef __true_type has_trivial_default_constructor; |
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149 | typedef __true_type has_trivial_copy_constructor; |
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150 | typedef __true_type has_trivial_assignment_operator; |
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151 | typedef __true_type has_trivial_destructor; |
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152 | typedef __true_type is_POD_type; |
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153 | }; |
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154 | |||
155 | template<> struct __type_traits |
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156 | typedef __true_type has_trivial_default_constructor; |
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157 | typedef __true_type has_trivial_copy_constructor; |
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158 | typedef __true_type has_trivial_assignment_operator; |
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159 | typedef __true_type has_trivial_destructor; |
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160 | typedef __true_type is_POD_type; |
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161 | }; |
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162 | |||
163 | template<> struct __type_traits |
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164 | typedef __true_type has_trivial_default_constructor; |
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165 | typedef __true_type has_trivial_copy_constructor; |
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166 | typedef __true_type has_trivial_assignment_operator; |
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167 | typedef __true_type has_trivial_destructor; |
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168 | typedef __true_type is_POD_type; |
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169 | }; |
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170 | |||
171 | template<> struct __type_traits |
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172 | typedef __true_type has_trivial_default_constructor; |
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173 | typedef __true_type has_trivial_copy_constructor; |
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174 | typedef __true_type has_trivial_assignment_operator; |
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175 | typedef __true_type has_trivial_destructor; |
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176 | typedef __true_type is_POD_type; |
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177 | }; |
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178 | |||
179 | #ifdef _GLIBCPP_USE_LONG_LONG |
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180 | |||
181 | template<> struct __type_traits |
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182 | typedef __true_type has_trivial_default_constructor; |
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183 | typedef __true_type has_trivial_copy_constructor; |
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184 | typedef __true_type has_trivial_assignment_operator; |
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185 | typedef __true_type has_trivial_destructor; |
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186 | typedef __true_type is_POD_type; |
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187 | }; |
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188 | |||
189 | template<> struct __type_traits |
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190 | typedef __true_type has_trivial_default_constructor; |
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191 | typedef __true_type has_trivial_copy_constructor; |
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192 | typedef __true_type has_trivial_assignment_operator; |
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193 | typedef __true_type has_trivial_destructor; |
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194 | typedef __true_type is_POD_type; |
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195 | }; |
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196 | |||
197 | #endif /* _GLIBCPP_USE_LONG_LONG */ |
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198 | |||
199 | template<> struct __type_traits |
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200 | typedef __true_type has_trivial_default_constructor; |
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201 | typedef __true_type has_trivial_copy_constructor; |
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202 | typedef __true_type has_trivial_assignment_operator; |
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203 | typedef __true_type has_trivial_destructor; |
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204 | typedef __true_type is_POD_type; |
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205 | }; |
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206 | |||
207 | template<> struct __type_traits |
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208 | typedef __true_type has_trivial_default_constructor; |
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209 | typedef __true_type has_trivial_copy_constructor; |
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210 | typedef __true_type has_trivial_assignment_operator; |
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211 | typedef __true_type has_trivial_destructor; |
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212 | typedef __true_type is_POD_type; |
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213 | }; |
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214 | |||
215 | template<> struct __type_traits |
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216 | typedef __true_type has_trivial_default_constructor; |
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217 | typedef __true_type has_trivial_copy_constructor; |
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218 | typedef __true_type has_trivial_assignment_operator; |
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219 | typedef __true_type has_trivial_destructor; |
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220 | typedef __true_type is_POD_type; |
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221 | }; |
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222 | |||
223 | template |
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224 | struct __type_traits<_Tp*> { |
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225 | typedef __true_type has_trivial_default_constructor; |
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226 | typedef __true_type has_trivial_copy_constructor; |
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227 | typedef __true_type has_trivial_assignment_operator; |
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228 | typedef __true_type has_trivial_destructor; |
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229 | typedef __true_type is_POD_type; |
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230 | }; |
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231 | |||
232 | |||
233 | // The following could be written in terms of numeric_limits. |
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234 | // We're doing it separately to reduce the number of dependencies. |
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235 | |||
236 | template |
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237 | typedef __false_type _Integral; |
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238 | }; |
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239 | |||
240 | template<> struct _Is_integer |
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241 | typedef __true_type _Integral; |
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242 | }; |
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243 | |||
244 | template<> struct _Is_integer |
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245 | typedef __true_type _Integral; |
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246 | }; |
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247 | |||
248 | template<> struct _Is_integer |
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249 | typedef __true_type _Integral; |
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250 | }; |
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251 | |||
252 | template<> struct _Is_integer |
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253 | typedef __true_type _Integral; |
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254 | }; |
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255 | |||
256 | template<> struct _Is_integer |
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257 | typedef __true_type _Integral; |
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258 | }; |
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259 | |||
260 | template<> struct _Is_integer |
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261 | typedef __true_type _Integral; |
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262 | }; |
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263 | |||
264 | template<> struct _Is_integer |
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265 | typedef __true_type _Integral; |
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266 | }; |
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267 | |||
268 | template<> struct _Is_integer |
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269 | typedef __true_type _Integral; |
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270 | }; |
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271 | |||
272 | template<> struct _Is_integer |
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273 | typedef __true_type _Integral; |
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274 | }; |
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275 | |||
276 | template<> struct _Is_integer |
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277 | typedef __true_type _Integral; |
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278 | }; |
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279 | |||
280 | template<> struct _Is_integer |
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281 | typedef __true_type _Integral; |
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282 | }; |
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283 | |||
284 | #ifdef _GLIBCPP_USE_LONG_LONG |
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285 | |||
286 | template<> struct _Is_integer |
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287 | typedef __true_type _Integral; |
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288 | }; |
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289 | |||
290 | template<> struct _Is_integer |
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291 | typedef __true_type _Integral; |
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292 | }; |
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293 | |||
294 | #endif /* _GLIBCPP_USE_LONG_LONG */ |
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295 | |||
296 | template |
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297 | typedef __false_type _Normal; |
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298 | }; |
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299 | |||
300 | // Forward declaration hack, should really include this from somewhere. |
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301 | namespace std { |
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302 | template |
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303 | }; |
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304 | |||
305 | template |
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306 | struct _Is_normal_iterator< std::__normal_iterator<_Iterator, _Container> > { |
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307 | typedef __true_type _Normal; |
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308 | }; |
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309 | |||
310 | #endif /* _CPP_BITS_TYPE_TRAITS_H */ |
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311 | |||
312 | // Local Variables: |
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313 | // mode:C++ |
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314 | // End:>>>>>>>>>>>>>>>>>>>>>>>>>>>>>> |