root / windows / trunk / libs / poco / include / Poco / MetaProgramming.h @ 23
View | Annotate | Download (3.1 KB)
| 1 | //
|
|---|---|
| 2 | // TypeChecks.h
|
| 3 | //
|
| 4 | // $Id: //poco/1.3/Foundation/include/Poco/MetaProgramming.h#1 $
|
| 5 | //
|
| 6 | // Library: Foundation
|
| 7 | // Package: Core
|
| 8 | // Module: MetaProgramming
|
| 9 | //
|
| 10 | // Common definitions useful for Meta Template Programming
|
| 11 | //
|
| 12 | // Copyright (c) 2006, Applied Informatics Software Engineering GmbH.
|
| 13 | // and Contributors.
|
| 14 | //
|
| 15 | // Permission is hereby granted, free of charge, to any person or organization
|
| 16 | // obtaining a copy of the software and accompanying documentation covered by
|
| 17 | // this license (the "Software") to use, reproduce, display, distribute,
|
| 18 | // execute, and transmit the Software, and to prepare derivative works of the
|
| 19 | // Software, and to permit third-parties to whom the Software is furnished to
|
| 20 | // do so, all subject to the following:
|
| 21 | //
|
| 22 | // The copyright notices in the Software and this entire statement, including
|
| 23 | // the above license grant, this restriction and the following disclaimer,
|
| 24 | // must be included in all copies of the Software, in whole or in part, and
|
| 25 | // all derivative works of the Software, unless such copies or derivative
|
| 26 | // works are solely in the form of machine-executable object code generated by
|
| 27 | // a source language processor.
|
| 28 | //
|
| 29 | // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
|
| 30 | // IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
|
| 31 | // FITNESS FOR A PARTICULAR PURPOSE, TITLE AND NON-INFRINGEMENT. IN NO EVENT
|
| 32 | // SHALL THE COPYRIGHT HOLDERS OR ANYONE DISTRIBUTING THE SOFTWARE BE LIABLE
|
| 33 | // FOR ANY DAMAGES OR OTHER LIABILITY, WHETHER IN CONTRACT, TORT OR OTHERWISE,
|
| 34 | // ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
|
| 35 | // DEALINGS IN THE SOFTWARE.
|
| 36 | //
|
| 37 | |
| 38 | |
| 39 | #ifndef Foundation_TypeChecks_INCLUDED
|
| 40 | #define Foundation_TypeChecks_INCLUDED
|
| 41 | |
| 42 | |
| 43 | #include "Poco/Foundation.h" |
| 44 | |
| 45 | |
| 46 | namespace Poco {
|
| 47 | |
| 48 | |
| 49 | template <typename T> |
| 50 | struct IsReference
|
| 51 | ///Use this struct to determine if a template type is a reference
|
| 52 | {
|
| 53 | enum
|
| 54 | {
|
| 55 | VALUE = 0
|
| 56 | }; |
| 57 | }; |
| 58 | |
| 59 | |
| 60 | template <typename T> |
| 61 | struct IsReference<T&>
|
| 62 | {
|
| 63 | enum
|
| 64 | {
|
| 65 | VALUE = 1
|
| 66 | }; |
| 67 | }; |
| 68 | |
| 69 | |
| 70 | template <typename T> |
| 71 | struct IsReference<const T&> |
| 72 | {
|
| 73 | enum
|
| 74 | {
|
| 75 | VALUE = 1
|
| 76 | }; |
| 77 | }; |
| 78 | |
| 79 | |
| 80 | |
| 81 | template <typename T> |
| 82 | struct IsConst
|
| 83 | ///Use this struct to determine if a template type is a const type
|
| 84 | {
|
| 85 | enum
|
| 86 | {
|
| 87 | VALUE = 0
|
| 88 | }; |
| 89 | }; |
| 90 | |
| 91 | |
| 92 | template <typename T> |
| 93 | struct IsConst<const T&> |
| 94 | {
|
| 95 | enum
|
| 96 | {
|
| 97 | VALUE = 1
|
| 98 | }; |
| 99 | }; |
| 100 | |
| 101 | |
| 102 | template <typename T> |
| 103 | struct IsConst<const T> |
| 104 | {
|
| 105 | enum
|
| 106 | {
|
| 107 | VALUE = 1
|
| 108 | }; |
| 109 | }; |
| 110 | |
| 111 | |
| 112 | template <typename T> |
| 113 | struct TypeWrapper
|
| 114 | /// Use the type wrapper if you want to dedecouple constness and references from template types
|
| 115 | {
|
| 116 | typedef T TYPE;
|
| 117 | typedef const T CONSTTYPE; |
| 118 | typedef T& REFTYPE;
|
| 119 | typedef const T& CONSTREFTYPE; |
| 120 | }; |
| 121 | |
| 122 | |
| 123 | template <typename T> |
| 124 | struct TypeWrapper<const T> |
| 125 | {
|
| 126 | typedef T TYPE;
|
| 127 | typedef const T CONSTTYPE; |
| 128 | typedef T& REFTYPE;
|
| 129 | typedef const T& CONSTREFTYPE; |
| 130 | }; |
| 131 | |
| 132 | |
| 133 | template <typename T> |
| 134 | struct TypeWrapper<const T&> |
| 135 | {
|
| 136 | typedef T TYPE;
|
| 137 | typedef const T CONSTTYPE; |
| 138 | typedef T& REFTYPE;
|
| 139 | typedef const T& CONSTREFTYPE; |
| 140 | }; |
| 141 | |
| 142 | |
| 143 | template <typename T> |
| 144 | struct TypeWrapper<T&>
|
| 145 | {
|
| 146 | typedef T TYPE;
|
| 147 | typedef const T CONSTTYPE; |
| 148 | typedef T& REFTYPE;
|
| 149 | typedef const T& CONSTREFTYPE; |
| 150 | }; |
| 151 | |
| 152 | |
| 153 | |
| 154 | } // namespace Poco
|
| 155 | |
| 156 | |
| 157 | #endif
|
