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vigra/sized_int.hxx | ![]() |
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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 1.4.0, Dec 21 2005 ) */ 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 /* koethe@informatik.uni-hamburg.de or */ 00012 /* vigra@kogs1.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 00039 #ifndef VIGRA_SIZED_INT_HXX 00040 #define VIGRA_SIZED_INT_HXX 00041 00042 #include "metaprogramming.hxx" 00043 00044 namespace vigra { 00045 00046 class Int_type_not_supported_on_this_platform {}; 00047 00048 #ifndef NO_PARTIAL_TEMPLATE_SPECIALIZATION 00049 00050 namespace detail { 00051 00052 template<class T, class NEXT> 00053 struct IntTypeList 00054 { 00055 enum { size = sizeof(T)*8 }; 00056 typedef T type; 00057 typedef NEXT next; 00058 }; 00059 00060 template<int SIZE, class LIST> 00061 struct SelectIntegerType 00062 { 00063 typedef typename 00064 IfBool<(SIZE == LIST::size), 00065 typename LIST::type, 00066 typename SelectIntegerType<SIZE, typename LIST::next>::type >::type 00067 type; 00068 }; 00069 00070 template<int SIZE> 00071 struct SelectIntegerType<SIZE, Int_type_not_supported_on_this_platform> 00072 { 00073 typedef Int_type_not_supported_on_this_platform type; 00074 }; 00075 00076 template<class LIST> 00077 struct SelectBiggestIntegerType 00078 { 00079 enum { cursize = LIST::size, 00080 nextsize = SelectBiggestIntegerType<typename LIST::next>::size, 00081 size = (cursize < nextsize) ? nextsize : cursize }; 00082 typedef typename 00083 IfBool<(cursize < nextsize), 00084 typename SelectBiggestIntegerType<typename LIST::next>::type, 00085 typename LIST::type>::type 00086 type; 00087 }; 00088 00089 template<> 00090 struct SelectBiggestIntegerType<Int_type_not_supported_on_this_platform> 00091 { 00092 enum { size = 0 }; 00093 typedef Int_type_not_supported_on_this_platform type; 00094 }; 00095 00096 typedef IntTypeList<signed char, 00097 IntTypeList<signed short, 00098 IntTypeList<signed int, 00099 IntTypeList<signed long, 00100 Int_type_not_supported_on_this_platform > > > > SignedIntTypes; 00101 typedef IntTypeList<unsigned char, 00102 IntTypeList<unsigned short, 00103 IntTypeList<unsigned int, 00104 IntTypeList<unsigned long, 00105 Int_type_not_supported_on_this_platform > > > > UnsignedIntTypes; 00106 00107 } // namespace detail 00108 00109 /** \addtogroup FixedSizeInt Fixed Size Integer Types 00110 00111 Since the C++ standard does only specifiy minimal sizes for the built-in 00112 integer types, one cannot rely on them have a specific size. But 00113 pixel types with a specific size are often required in image processing, 00114 especially when reading or writing binary files. The VIGRA typedefs 00115 are guaranteed to have exactly the correct size. If the system 00116 does not provide a suitable type, the typedef will evaluate to 00117 <tt>Int_type_not_supported_on_this_platform</tt>. 00118 */ 00119 //@{ 00120 00121 /// 8-bit signed int 00122 typedef detail::SelectIntegerType<8, detail::SignedIntTypes>::type Int8; 00123 /// 16-bit signed int 00124 typedef detail::SelectIntegerType<16, detail::SignedIntTypes>::type Int16; 00125 /// 32-bit signed int 00126 typedef detail::SelectIntegerType<32, detail::SignedIntTypes>::type Int32; 00127 /// 64-bit signed int 00128 typedef detail::SelectIntegerType<64, detail::SignedIntTypes>::type Int64; 00129 /// 8-bit unsigned int 00130 typedef detail::SelectIntegerType<8, detail::UnsignedIntTypes>::type UInt8; 00131 /// 16-bit unsigned int 00132 typedef detail::SelectIntegerType<16, detail::UnsignedIntTypes>::type UInt16; 00133 /// 32-bit unsigned int 00134 typedef detail::SelectIntegerType<32, detail::UnsignedIntTypes>::type UInt32; 00135 /// 64-bit unsigned int 00136 typedef detail::SelectIntegerType<64, detail::UnsignedIntTypes>::type UInt64; 00137 00138 /// the biggest signed integer type of the system 00139 typedef detail::SelectBiggestIntegerType<detail::SignedIntTypes>::type IntBiggest; 00140 /// the biggest unsigned integer type of the system 00141 typedef detail::SelectBiggestIntegerType<detail::UnsignedIntTypes>::type UIntBiggest; 00142 00143 //@} 00144 00145 #else // NO_PARTIAL_TEMPLATE_SPECIALIZATION 00146 00147 typedef signed char Int8; 00148 typedef signed short Int16; 00149 typedef signed int Int32; 00150 typedef Int_type_not_supported_on_this_platform Int64; 00151 typedef unsigned char UInt8; 00152 typedef unsigned short UInt16; 00153 typedef unsigned int UInt32; 00154 typedef Int_type_not_supported_on_this_platform UInt64; 00155 00156 typedef Int32 IntBiggest; 00157 typedef UInt32 UIntBiggest; 00158 00159 #endif // NO_PARTIAL_TEMPLATE_SPECIALIZATION 00160 00161 } // namespace vigra 00162 00163 #endif /* VIGRA_SIZED_INT_HXX */
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