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vigra/sized_int.hxx |

    00001 /************************************************************************/
    00002 /*                                                                      */
    00003 /*               Copyright 1998-2002 by Ullrich Koethe                  */
    00004 /*                                                                      */
    00005 /*    This file is part of the VIGRA computer vision library.           */
    00006 /*    The VIGRA Website is                                              */
    00007 /*        http://hci.iwr.uni-heidelberg.de/vigra/                       */
    00008 /*    Please direct questions, bug reports, and contributions to        */
    00009 /*        ullrich.koethe@iwr.uni-heidelberg.de    or                    */
    00010 /*        vigra@informatik.uni-hamburg.de                               */
    00011 /*                                                                      */
    00012 /*    Permission is hereby granted, free of charge, to any person       */
    00013 /*    obtaining a copy of this software and associated documentation    */
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    00018 /*    Software is furnished to do so, subject to the following          */
    00019 /*    conditions:                                                       */
    00020 /*                                                                      */
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    00022 /*    included in all copies or substantial portions of the             */
    00023 /*    Software.                                                         */
    00024 /*                                                                      */
    00025 /*    THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND    */
    00026 /*    EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES   */
    00027 /*    OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND          */
    00028 /*    NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT       */
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    00031 /*    FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR     */
    00032 /*    OTHER DEALINGS IN THE SOFTWARE.                                   */
    00033 /*                                                                      */
    00034 /************************************************************************/
    00035
    00036
    00037 #ifndef VIGRA_SIZED_INT_HXX
    00038 #define VIGRA_SIZED_INT_HXX
    00039
    00040 #include "metaprogramming.hxx"
    00041 #include <limits>
    00042
    00043 #if   SHRT_MAX  == 0x7FL
    00044 # define VIGRA_BITSOF_SHORT 8
    00045 #elif SHRT_MAX  == 0x7FFFL
    00046 # define VIGRA_BITSOF_SHORT 16
    00047 #elif SHRT_MAX  == 0x7FFFFFFFL
    00048 # define VIGRA_BITSOF_SHORT 32
    00049 #elif SHRT_MAX  > 0xFFFFFFFFL
    00050 # define VIGRA_BITSOF_SHORT 64
    00051 #else
    00052 # define VIGRA_BITSOF_SHORT -1
    00053 #endif
    00054
    00055 #if   INT_MAX  == 0x7FL
    00056 # define VIGRA_BITSOF_INT 8
    00057 #elif INT_MAX  == 0x7FFFL
    00058 # define VIGRA_BITSOF_INT 16
    00059 #elif INT_MAX  == 0x7FFFFFFFL
    00060 # define VIGRA_BITSOF_INT 32
    00061 #elif INT_MAX  > 0xFFFFFFFFL
    00062 # define VIGRA_BITSOF_INT 64
    00063 #else
    00064 # define VIGRA_BITSOF_INT -1
    00065 #endif
    00066
    00067 #if   LONG_MAX  == 0x7FL
    00068 # define VIGRA_BITSOF_LONG 8
    00069 #elif LONG_MAX  == 0x7FFFL
    00070 # define VIGRA_BITSOF_LONG 16
    00071 #elif LONG_MAX  == 0x7FFFFFFFL
    00072 # define VIGRA_BITSOF_LONG 32
    00073 #elif LONG_MAX  > 0xFFFFFFFFL
    00074 # define VIGRA_BITSOF_LONG 64
    00075 #else
    00076 # define VIGRA_BITSOF_LONG -1
    00077 #endif
    00078
    00079 #if   LLONG_MAX  == 0x7FL
    00080 # define VIGRA_BITSOF_LONG_LONG 8
    00081 #elif LLONG_MAX  == 0x7FFFL
    00082 # define VIGRA_BITSOF_LONG_LONG 16
    00083 #elif LLONG_MAX  == 0x7FFFFFFFL
    00084 # define VIGRA_BITSOF_LONG_LONG 32
    00085 #elif LLONG_MAX  > 0xFFFFFFFFL
    00086 # define VIGRA_BITSOF_LONG_LONG 64
    00087 #else
    00088 # define VIGRA_BITSOF_LONG_LONG -1
    00089 #endif
    00090
    00091 namespace vigra {
    00092
    00093 class Int_type_not_supported_on_this_platform {};
    00094
    00095 #ifndef NO_PARTIAL_TEMPLATE_SPECIALIZATION
    00096
    00097 namespace detail {
    00098
    00099 template<class T, class NEXT>
    00100 struct IntTypeList
    00101 {
    00102     enum { size = sizeof(T)*8 };
    00103     typedef T type;
    00104     typedef NEXT next;
    00105 };
    00106
    00107 template<int SIZE, class LIST>
    00108 struct SelectIntegerType
    00109 {
    00110     typedef typename
    00111        IfBool<(SIZE == LIST::size),
    00112            typename LIST::type,
    00113            typename SelectIntegerType<SIZE, typename LIST::next>::type >::type
    00114        type;
    00115 };
    00116
    00117 template<int SIZE>
    00118 struct SelectIntegerType<SIZE, Int_type_not_supported_on_this_platform>
    00119 {
    00120     typedef Int_type_not_supported_on_this_platform type;
    00121 };
    00122
    00123 template<class LIST>
    00124 struct SelectBiggestIntegerType
    00125 {
    00126     enum { cursize = static_cast<int>(LIST::size),
    00127            nextsize = static_cast<int>(SelectBiggestIntegerType<typename LIST::next>::size),
    00128            size = (cursize < nextsize) ? nextsize : cursize };
    00129     typedef typename
    00130        IfBool<(cursize < nextsize),
    00131            typename SelectBiggestIntegerType<typename LIST::next>::type,
    00132            typename LIST::type>::type
    00133        type;
    00134 };
    00135
    00136 template<>
    00137 struct SelectBiggestIntegerType<Int_type_not_supported_on_this_platform>
    00138 {
    00139     enum { size = 0 };
    00140     typedef Int_type_not_supported_on_this_platform type;
    00141 };
    00142
    00143 typedef IntTypeList<signed char,
    00144         IntTypeList<signed short,
    00145         IntTypeList<signed int,
    00146         IntTypeList<signed long,
    00147         IntTypeList<signed long long,
    00148         Int_type_not_supported_on_this_platform > > > > > SignedIntTypes;
    00149 typedef IntTypeList<unsigned char,
    00150         IntTypeList<unsigned short,
    00151         IntTypeList<unsigned int,
    00152         IntTypeList<unsigned long,
    00153         IntTypeList<unsigned long long,
    00154         Int_type_not_supported_on_this_platform > > > > > UnsignedIntTypes;
    00155
    00156 } // namespace detail
    00157
    00158 /** \addtogroup FixedSizeInt Fixed Size Integer Types
    00159
    00160     Since the C++ standard does only specify minimal sizes for the built-in
    00161     integer types, one cannot rely on them to have a specific size. But
    00162     pixel types with a specific size are often required in image processing,
    00163     especially when reading or writing binary files. The VIGRA typedefs
    00164     are guaranteed to have exactly the correct size. If the system
    00165     does not provide a suitable type, the typedef will evaluate to
    00166     <tt>Int_type_not_supported_on_this_platform</tt>.
    00167 */
    00168 //@{
    00169
    00170     /// 8-bit signed int
    00171 typedef detail::SelectIntegerType<8,  detail::SignedIntTypes>::type Int8;
    00172     /// 16-bit signed int
    00173 typedef detail::SelectIntegerType<16, detail::SignedIntTypes>::type Int16;
    00174     /// 32-bit signed int
    00175 typedef detail::SelectIntegerType<32, detail::SignedIntTypes>::type Int32;
    00176     /// 64-bit signed int
    00177 typedef detail::SelectIntegerType<64, detail::SignedIntTypes>::type Int64;
    00178     /// 8-bit unsigned int
    00179 typedef detail::SelectIntegerType<8,  detail::UnsignedIntTypes>::type UInt8;
    00180     /// 16-bit unsigned int
    00181 typedef detail::SelectIntegerType<16, detail::UnsignedIntTypes>::type UInt16;
    00182     /// 32-bit unsigned int
    00183 typedef detail::SelectIntegerType<32, detail::UnsignedIntTypes>::type UInt32;
    00184     /// 64-bit unsigned int
    00185 typedef detail::SelectIntegerType<64, detail::UnsignedIntTypes>::type UInt64;
    00186
    00187     /// the biggest signed integer type of the system
    00188 typedef detail::SelectBiggestIntegerType<detail::SignedIntTypes>::type   IntBiggest;
    00189     /// the biggest unsigned integer type of the system
    00190 typedef detail::SelectBiggestIntegerType<detail::UnsignedIntTypes>::type UIntBiggest;
    00191
    00192 //@}
    00193
    00194 #else // NO_PARTIAL_TEMPLATE_SPECIALIZATION
    00195
    00196 typedef signed char    Int8;
    00197 typedef signed short   Int16;
    00198 typedef signed int     Int32;
    00199 typedef Int_type_not_supported_on_this_platform Int64;
    00200 typedef unsigned char  UInt8;
    00201 typedef unsigned short UInt16;
    00202 typedef unsigned int   UInt32;
    00203 typedef Int_type_not_supported_on_this_platform UInt64;
    00204
    00205 typedef Int32  IntBiggest;
    00206 typedef UInt32 UIntBiggest;
    00207
    00208 #endif // NO_PARTIAL_TEMPLATE_SPECIALIZATION
    00209
    00210 } // namespace vigra
    00211
    00212 #endif /* VIGRA_SIZED_INT_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 1.9.0 (Tue Nov 6 2012)