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sized_int.hxx
1/************************************************************************/
2/* */
3/* Copyright 1998-2002 by Ullrich Koethe */
4/* */
5/* This file is part of the VIGRA computer vision library. */
6/* The VIGRA Website is */
7/* http://hci.iwr.uni-heidelberg.de/vigra/ */
8/* Please direct questions, bug reports, and contributions to */
9/* ullrich.koethe@iwr.uni-heidelberg.de or */
10/* vigra@informatik.uni-hamburg.de */
11/* */
12/* Permission is hereby granted, free of charge, to any person */
13/* obtaining a copy of this software and associated documentation */
14/* files (the "Software"), to deal in the Software without */
15/* restriction, including without limitation the rights to use, */
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17/* sell copies of the Software, and to permit persons to whom the */
18/* Software is furnished to do so, subject to the following */
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20/* */
21/* The above copyright notice and this permission notice shall be */
22/* included in all copies or substantial portions of the */
23/* Software. */
24/* */
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33/* */
34/************************************************************************/
35
36
37#ifndef VIGRA_SIZED_INT_HXX
38#define VIGRA_SIZED_INT_HXX
39
40#include "metaprogramming.hxx"
41#include <limits>
42
43#if SHRT_MAX == 0x7FL
44# define VIGRA_BITSOF_SHORT 8
45#elif SHRT_MAX == 0x7FFFL
46# define VIGRA_BITSOF_SHORT 16
47#elif SHRT_MAX == 0x7FFFFFFFL
48# define VIGRA_BITSOF_SHORT 32
49#elif SHRT_MAX > 0xFFFFFFFFL
50# define VIGRA_BITSOF_SHORT 64
51#else
52# define VIGRA_BITSOF_SHORT -1
53#endif
54
55#if INT_MAX == 0x7FL
56# define VIGRA_BITSOF_INT 8
57#elif INT_MAX == 0x7FFFL
58# define VIGRA_BITSOF_INT 16
59#elif INT_MAX == 0x7FFFFFFFL
60# define VIGRA_BITSOF_INT 32
61#elif INT_MAX > 0xFFFFFFFFL
62# define VIGRA_BITSOF_INT 64
63#else
64# define VIGRA_BITSOF_INT -1
65#endif
66
67#if LONG_MAX == 0x7FL
68# define VIGRA_BITSOF_LONG 8
69#elif LONG_MAX == 0x7FFFL
70# define VIGRA_BITSOF_LONG 16
71#elif LONG_MAX == 0x7FFFFFFFL
72# define VIGRA_BITSOF_LONG 32
73#elif LONG_MAX > 0xFFFFFFFFL
74# define VIGRA_BITSOF_LONG 64
75#else
76# define VIGRA_BITSOF_LONG -1
77#endif
78
79#if LLONG_MAX == 0x7FL
80# define VIGRA_BITSOF_LONG_LONG 8
81#elif LLONG_MAX == 0x7FFFL
82# define VIGRA_BITSOF_LONG_LONG 16
83#elif LLONG_MAX == 0x7FFFFFFFL
84# define VIGRA_BITSOF_LONG_LONG 32
85#elif LLONG_MAX > 0xFFFFFFFFL
86# define VIGRA_BITSOF_LONG_LONG 64
87#else
88# define VIGRA_BITSOF_LONG_LONG -1
89#endif
90
91namespace vigra {
92
93class Int_type_not_supported_on_this_platform {};
94
95#ifndef NO_PARTIAL_TEMPLATE_SPECIALIZATION
96
97namespace detail {
98
99template<class T, class NEXT>
100struct IntTypeList
101{
102 enum { size = sizeof(T)*8 };
103 typedef T type;
104 typedef NEXT next;
105};
106
107template<int SIZE, class LIST>
108struct SelectIntegerType
109{
110 typedef typename
111 IfBool<(SIZE == LIST::size),
112 typename LIST::type,
113 typename SelectIntegerType<SIZE, typename LIST::next>::type >::type
114 type;
115};
116
117template<int SIZE>
118struct SelectIntegerType<SIZE, Int_type_not_supported_on_this_platform>
119{
120 typedef Int_type_not_supported_on_this_platform type;
121};
122
123template<class LIST>
124struct SelectBiggestIntegerType
125{
126 enum { cursize = static_cast<int>(LIST::size),
127 nextsize = static_cast<int>(SelectBiggestIntegerType<typename LIST::next>::size),
128 size = (cursize < nextsize) ? nextsize : cursize };
129 typedef typename
130 IfBool<(cursize < nextsize),
131 typename SelectBiggestIntegerType<typename LIST::next>::type,
132 typename LIST::type>::type
133 type;
134};
135
136template<>
137struct SelectBiggestIntegerType<Int_type_not_supported_on_this_platform>
138{
139 enum { size = 0 };
140 typedef Int_type_not_supported_on_this_platform type;
141};
142
143typedef IntTypeList<signed char,
144 IntTypeList<signed short,
145 IntTypeList<signed int,
146 IntTypeList<signed long,
147 IntTypeList<signed long long,
148 Int_type_not_supported_on_this_platform > > > > > SignedIntTypes;
149typedef IntTypeList<unsigned char,
150 IntTypeList<unsigned short,
151 IntTypeList<unsigned int,
152 IntTypeList<unsigned long,
153 IntTypeList<unsigned long long,
154 Int_type_not_supported_on_this_platform > > > > > UnsignedIntTypes;
155
156} // namespace detail
157
158/** \addtogroup FixedSizeInt Fixed Size Integer Types
159
160 Since the C++ standard does only specify minimal sizes for the built-in
161 integer types, one cannot rely on them to have a specific size. But
162 pixel types with a specific size are often required in image processing,
163 especially when reading or writing binary files. The VIGRA typedefs
164 are guaranteed to have exactly the correct size. If the system
165 does not provide a suitable type, the typedef will evaluate to
166 <tt>Int_type_not_supported_on_this_platform</tt>.
167*/
168//@{
169
170 /// 8-bit signed int
171typedef detail::SelectIntegerType<8, detail::SignedIntTypes>::type Int8;
172 /// 16-bit signed int
173typedef detail::SelectIntegerType<16, detail::SignedIntTypes>::type Int16;
174 /// 32-bit signed int
175typedef detail::SelectIntegerType<32, detail::SignedIntTypes>::type Int32;
176 /// 64-bit signed int
177typedef detail::SelectIntegerType<64, detail::SignedIntTypes>::type Int64;
178 /// 8-bit unsigned int
179typedef detail::SelectIntegerType<8, detail::UnsignedIntTypes>::type UInt8;
180 /// 16-bit unsigned int
181typedef detail::SelectIntegerType<16, detail::UnsignedIntTypes>::type UInt16;
182 /// 32-bit unsigned int
183typedef detail::SelectIntegerType<32, detail::UnsignedIntTypes>::type UInt32;
184 /// 64-bit unsigned int
185typedef detail::SelectIntegerType<64, detail::UnsignedIntTypes>::type UInt64;
186
187 /// the biggest signed integer type of the system
188typedef detail::SelectBiggestIntegerType<detail::SignedIntTypes>::type IntBiggest;
189 /// the biggest unsigned integer type of the system
190typedef detail::SelectBiggestIntegerType<detail::UnsignedIntTypes>::type UIntBiggest;
191
192//@}
193
194#else // NO_PARTIAL_TEMPLATE_SPECIALIZATION
195
196typedef signed char Int8;
197typedef signed short Int16;
198typedef signed int Int32;
199typedef Int_type_not_supported_on_this_platform Int64;
200typedef unsigned char UInt8;
201typedef unsigned short UInt16;
202typedef unsigned int UInt32;
203typedef Int_type_not_supported_on_this_platform UInt64;
204
205typedef Int32 IntBiggest;
206typedef UInt32 UIntBiggest;
207
208#endif // NO_PARTIAL_TEMPLATE_SPECIALIZATION
209
210} // namespace vigra
211
212#endif /* VIGRA_SIZED_INT_HXX */
detail::SelectBiggestIntegerType< detail::SignedIntTypes >::type IntBiggest
the biggest signed integer type of the system
Definition sized_int.hxx:188
detail::SelectIntegerType< 16, detail::SignedIntTypes >::type Int16
16-bit signed int
Definition sized_int.hxx:173
detail::SelectIntegerType< 8, detail::UnsignedIntTypes >::type UInt8
8-bit unsigned int
Definition sized_int.hxx:179
detail::SelectIntegerType< 32, detail::UnsignedIntTypes >::type UInt32
32-bit unsigned int
Definition sized_int.hxx:183
detail::SelectIntegerType< 8, detail::SignedIntTypes >::type Int8
8-bit signed int
Definition sized_int.hxx:171
detail::SelectIntegerType< 64, detail::UnsignedIntTypes >::type UInt64
64-bit unsigned int
Definition sized_int.hxx:185
detail::SelectIntegerType< 16, detail::UnsignedIntTypes >::type UInt16
16-bit unsigned int
Definition sized_int.hxx:181
detail::SelectBiggestIntegerType< detail::UnsignedIntTypes >::type UIntBiggest
the biggest unsigned integer type of the system
Definition sized_int.hxx:190
detail::SelectIntegerType< 64, detail::SignedIntTypes >::type Int64
64-bit signed int
Definition sized_int.hxx:177
detail::SelectIntegerType< 32, detail::SignedIntTypes >::type Int32
32-bit signed int
Definition sized_int.hxx:175

© Ullrich Köthe (ullrich.koethe@iwr.uni-heidelberg.de)
Heidelberg Collaboratory for Image Processing, University of Heidelberg, Germany

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