1// Ceres Solver - A fast non-linear least squares minimizer
2// Copyright 2010, 2011, 2012 Google Inc. All rights reserved.
3// http://code.google.com/p/ceres-solver/
4//
5// Redistribution and use in source and binary forms, with or without
6// modification, are permitted provided that the following conditions are met:
7//
8// * Redistributions of source code must retain the above copyright notice,
9//   this list of conditions and the following disclaimer.
10// * Redistributions in binary form must reproduce the above copyright notice,
11//   this list of conditions and the following disclaimer in the documentation
12//   and/or other materials provided with the distribution.
13// * Neither the name of Google Inc. nor the names of its contributors may be
14//   used to endorse or promote products derived from this software without
15//   specific prior written permission.
16//
17// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
18// AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
19// IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
20// ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
21// LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
22// CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
23// SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
24// INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
25// CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
26// ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
27// POSSIBILITY OF SUCH DAMAGE.
28//
29// Author: keir@google.com (Keir Mierle)
30//
31// Portable typedefs for various fixed-size integers. Uses template
32// metaprogramming instead of fragile compiler defines.
33
34#ifndef CERES_INTERNAL_INTEGRAL_TYPES_H_
35#define CERES_INTERNAL_INTEGRAL_TYPES_H_
36
37namespace ceres {
38namespace internal {
39
40// Compile time ternary on types.
41template<bool kCondition, typename kTrueType, typename kFalseType>
42struct Ternary {
43  typedef kTrueType type;
44};
45template<typename kTrueType, typename kFalseType>
46struct Ternary<false, kTrueType, kFalseType> {
47  typedef kFalseType type;
48};
49
50#define CERES_INTSIZE(TYPE) \
51    typename Ternary<sizeof(TYPE) * 8 == kBits, TYPE,
52
53template<int kBits>
54struct Integer {
55  typedef
56      CERES_INTSIZE(char)
57      CERES_INTSIZE(short)
58      CERES_INTSIZE(int)
59      CERES_INTSIZE(long int)
60      CERES_INTSIZE(long long)
61      void>::type >::type >::type >::type >::type
62      type;
63};
64
65template<int kBits>
66struct UnsignedInteger {
67  typedef
68      CERES_INTSIZE(unsigned char)
69      CERES_INTSIZE(unsigned short)
70      CERES_INTSIZE(unsigned int)
71      CERES_INTSIZE(unsigned long int)
72      CERES_INTSIZE(unsigned long long)
73      void>::type >::type >::type >::type >::type
74      type;
75};
76
77#undef CERES_INTSIZE
78
79typedef Integer< 8>::type int8;
80typedef Integer<32>::type int32;
81typedef Integer<64>::type int64;
82
83typedef UnsignedInteger< 8>::type uint8;
84typedef UnsignedInteger<16>::type uint16;
85typedef UnsignedInteger<32>::type uint32;
86typedef UnsignedInteger<64>::type uint64;
87
88}  // namespace internal
89}  // namespace ceres
90
91#endif  // CERES_INTERNAL_INTEGRAL_TYPES_H_
92