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# vigra/metaprogramming.hxx

    00001 /************************************************************************/
    00002 /*                                                                      */
    00003 /*               Copyright 1998-2002 by Ullrich Koethe                  */
    00004 /*       Cognitive Systems Group, University of Hamburg, Germany        */
    00005 /*                                                                      */
    00006 /*    This file is part of the VIGRA computer vision library.           */
    00007 /*    ( Version 1.6.0, Aug 13 2008 )                                    */
    00008 /*    The VIGRA Website is                                              */
    00009 /*        http://kogs-www.informatik.uni-hamburg.de/~koethe/vigra/      */
    00010 /*    Please direct questions, bug reports, and contributions to        */
    00011 /*        ullrich.koethe@iwr.uni-heidelberg.de    or                    */
    00012 /*        vigra@informatik.uni-hamburg.de                               */
    00013 /*                                                                      */
    00014 /*    Permission is hereby granted, free of charge, to any person       */
    00015 /*    obtaining a copy of this software and associated documentation    */
    00016 /*    files (the "Software"), to deal in the Software without           */
    00017 /*    restriction, including without limitation the rights to use,      */
    00018 /*    copy, modify, merge, publish, distribute, sublicense, and/or      */
    00019 /*    sell copies of the Software, and to permit persons to whom the    */
    00020 /*    Software is furnished to do so, subject to the following          */
    00021 /*    conditions:                                                       */
    00022 /*                                                                      */
    00023 /*    The above copyright notice and this permission notice shall be    */
    00024 /*    included in all copies or substantial portions of the             */
    00025 /*    Software.                                                         */
    00026 /*                                                                      */
    00027 /*    THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND    */
    00028 /*    EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES   */
    00029 /*    OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND          */
    00030 /*    NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT       */
    00031 /*    HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,      */
    00032 /*    WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING      */
    00033 /*    FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR     */
    00034 /*    OTHER DEALINGS IN THE SOFTWARE.                                   */
    00035 /*                                                                      */
    00036 /************************************************************************/
    00037
    00038 #ifndef VIGRA_METAPROGRAMMING_HXX
    00039 #define VIGRA_METAPROGRAMMING_HXX
    00040
    00041 #include "config.hxx"
    00042 #include <limits.h>
    00043
    00044 namespace vigra {
    00045
    00046 template <int N>
    00047 class MetaInt
    00048 {
    00049   public:
    00050     enum { value = N };
    00051 };
    00052
    00053 struct VigraTrueType
    00054 {
    00055    enum { asBool = true };
    00056 };
    00057
    00058 struct VigraFalseType
    00059 {
    00060     enum { asBool = false };
    00061 };
    00062
    00063 /**  \addtogroup MultiArrayTags Multi-dimensional Array Tags
    00064       Meta-programming tags to mark array's as strided or unstrided.
    00065 */
    00066
    00067 //@{
    00068
    00069 /********************************************************/
    00070 /*                                                      */
    00071 /*                   StridedArrayTag                    */
    00072 /*                                                      */
    00073 /********************************************************/
    00074
    00075 /** tag for marking a MultiArray strided.
    00076
    00077 <b>\#include</b>
    00078 <<a href="multi__array_8hxx-source.html">vigra/multi_array.hxx</a>>
    00079
    00080 Namespace: vigra
    00081 */
    00082 struct StridedArrayTag {};
    00083
    00084 /********************************************************/
    00085 /*                                                      */
    00086 /*                  UnstridedArrayTag                   */
    00087 /*                                                      */
    00088 /********************************************************/
    00089
    00090 /** tag for marking a MultiArray unstrided.
    00091
    00092 <b>\#include</b>
    00093 <<a href="multi__array_8hxx-source.html">vigra/multi_array.hxx</a>>
    00094
    00095 Namespace: vigra
    00096 */
    00097 struct UnstridedArrayTag {};
    00098
    00099 template<class T>
    00100 class TypeTraits
    00101 {
    00102   public:
    00103     typedef VigraFalseType isConst;
    00104     typedef VigraFalseType isPOD;
    00105     typedef VigraFalseType isBuiltinType;
    00106 };
    00107
    00108 #ifndef NO_PARTIAL_TEMPLATE_SPECIALIZATION
    00109
    00110 template<class T>
    00111 class TypeTraits<T const>
    00112 : public TypeTraits<T>
    00113 {
    00114   public:
    00115     typedef VigraTrueType isConst;
    00116 };
    00117
    00118 template<class T>
    00119 class TypeTraits<T *>
    00120 {
    00121   public:
    00122     typedef VigraFalseType isConst;
    00123     typedef VigraTrueType isPOD;
    00124     typedef VigraTrueType isBuiltinType;
    00125 };
    00126
    00127 template<class T>
    00128 class TypeTraits<T const *>
    00129 {
    00130   public:
    00131     typedef VigraFalseType isConst;
    00132     typedef VigraTrueType isPOD;
    00133     typedef VigraTrueType isBuiltinType;
    00134 };
    00135
    00136 #endif // NO_PARTIAL_TEMPLATE_SPECIALIZATION
    00137
    00138 namespace detail {
    00139
    00140 template <int size>
    00141 struct SizeToType;
    00142
    00143 } // namespace detail
    00144
    00145 #define VIGRA_TYPE_TRAITS(type, size) \
    00146 template<> \
    00147 class TypeTraits<type> \
    00148 { \
    00149   public: \
    00150     typedef VigraFalseType isConst; \
    00151     typedef VigraTrueType isPOD; \
    00152     typedef VigraTrueType isBuiltinType; \
    00153     typedef char TypeToSize[size]; \
    00154 }; \
    00155  \
    00156 namespace detail { \
    00157   TypeTraits<type>::TypeToSize * typeToSize(type); \
    00158   \
    00159   template <> \
    00160   struct SizeToType<size> \
    00161   { \
    00162       typedef type result; \
    00163   }; \
    00164 }
    00165
    00166 VIGRA_TYPE_TRAITS(char, 1)
    00167 VIGRA_TYPE_TRAITS(signed char, 2)
    00168 VIGRA_TYPE_TRAITS(unsigned char, 3)
    00169 VIGRA_TYPE_TRAITS(short, 4)
    00170 VIGRA_TYPE_TRAITS(unsigned short, 5)
    00171 VIGRA_TYPE_TRAITS(int, 6)
    00172 VIGRA_TYPE_TRAITS(unsigned int, 7)
    00173 VIGRA_TYPE_TRAITS(long, 8)
    00174 VIGRA_TYPE_TRAITS(unsigned long, 9)
    00175 VIGRA_TYPE_TRAITS(float, 10)
    00176 VIGRA_TYPE_TRAITS(double, 11)
    00177 VIGRA_TYPE_TRAITS(long double, 12)
    00178 #ifdef LLONG_MAX
    00179 VIGRA_TYPE_TRAITS(long long, 13)
    00180 VIGRA_TYPE_TRAITS(unsigned long long, 14)
    00181 #endif
    00182
    00183 #undef VIGRA_TYPE_TRAITS
    00184
    00185 //@}
    00186
    00187 template <class A>
    00188 struct Not;
    00189
    00190 template <>
    00191 struct Not<VigraTrueType>
    00192 {
    00193     typedef VigraFalseType result;
    00194     static const bool boolResult = false;
    00195 };
    00196
    00197 template <>
    00198 struct Not<VigraFalseType>
    00199 {
    00200     typedef VigraTrueType result;
    00201     static const bool boolResult = true;
    00202 };
    00203
    00204 template <class L, class R>
    00205 struct And;
    00206
    00207 template <>
    00208 struct And<VigraFalseType, VigraFalseType>
    00209 {
    00210     typedef VigraFalseType result;
    00211     static const bool boolResult = false;
    00212 };
    00213
    00214 template <>
    00215 struct And<VigraFalseType, VigraTrueType>
    00216 {
    00217     typedef VigraFalseType result;
    00218     static const bool boolResult = false;
    00219 };
    00220
    00221 template <>
    00222 struct And<VigraTrueType, VigraFalseType>
    00223 {
    00224     typedef VigraFalseType result;
    00225     static const bool boolResult = false;
    00226 };
    00227
    00228 template <>
    00229 struct And<VigraTrueType, VigraTrueType>
    00230 {
    00231     typedef VigraTrueType result;
    00232     static const bool boolResult = true;
    00233 };
    00234
    00235 template <class L, class R>
    00236 struct Or;
    00237
    00238 template <>
    00239 struct Or<VigraFalseType, VigraFalseType>
    00240 {
    00241     typedef VigraFalseType result;
    00242     static const bool boolResult = false;
    00243 };
    00244
    00245 template <>
    00246 struct Or<VigraTrueType, VigraFalseType>
    00247 {
    00248     typedef VigraTrueType result;
    00249     static const bool boolResult = true;
    00250 };
    00251
    00252 template <>
    00253 struct Or<VigraFalseType, VigraTrueType>
    00254 {
    00255     typedef VigraTrueType result;
    00256     static const bool boolResult = true;
    00257 };
    00258
    00259 template <>
    00260 struct Or<VigraTrueType, VigraTrueType>
    00261 {
    00262     typedef VigraTrueType result;
    00263     static const bool boolResult = true;
    00264 };
    00265
    00266 #ifndef NO_PARTIAL_TEMPLATE_SPECIALIZATION
    00267
    00268 template <class PREDICATE, class TRUECASE, class FALSECASE>
    00269 struct If;
    00270
    00271 template <class TRUECASE, class FALSECASE>
    00272 struct If<VigraTrueType, TRUECASE, FALSECASE>
    00273 {
    00274     typedef TRUECASE type;
    00275 };
    00276
    00277 template <class TRUECASE, class FALSECASE>
    00278 struct If<VigraFalseType, TRUECASE, FALSECASE>
    00279 {
    00280     typedef FALSECASE type;
    00281 };
    00282
    00283 template <bool PREDICATE, class TRUECASE, class FALSECASE>
    00284 struct IfBool;
    00285
    00286 template <class TRUECASE, class FALSECASE>
    00287 struct IfBool<true, TRUECASE, FALSECASE>
    00288 {
    00289     typedef TRUECASE type;
    00290 };
    00291
    00292 template <class TRUECASE, class FALSECASE>
    00293 struct IfBool<false, TRUECASE, FALSECASE>
    00294 {
    00295     typedef FALSECASE type;
    00296 };
    00297
    00298 template <class L, class R>
    00299 struct IsSameType
    00300 {
    00301     typedef VigraFalseType result;
    00302     static const bool boolResult = false;
    00303 };
    00304
    00305 template <class T>
    00306 struct IsSameType<T, T>
    00307 {
    00308     typedef VigraTrueType result;
    00309     static const bool boolResult = true;
    00310 };
    00311
    00312 template <class DERIVED, class BASE>
    00313 struct IsDerivedFrom
    00314 {
    00315     typedef char falseResult[1];
    00316     typedef char trueResult[2];
    00317
    00318     static falseResult * testIsDerivedFrom(...);
    00319     static trueResult * testIsDerivedFrom(BASE const *);
    00320
    00321     enum { resultSize = sizeof(*testIsDerivedFrom((DERIVED const *)0)) };
    00322
    00323     static const bool boolResult = (resultSize == 2);
    00324     typedef typename
    00325         IfBool<boolResult, VigraTrueType, VigraFalseType>::type
    00326         result;
    00327 };
    00328
    00329 #endif // NO_PARTIAL_TEMPLATE_SPECIALIZATION
    00330
    00331 } // namespace vigra
    00332
    00333 #endif /* VIGRA_METAPROGRAMMING_HXX */

© Ullrich Köthe (ullrich.koethe@iwr.uni-heidelberg.de) Heidelberg Collaboratory for Image Processing, University of Heidelberg, Germany | html generated using doxygen and Python VIGRA 1.6.0 (13 Aug 2008)