1// Ceres Solver - A fast non-linear least squares minimizer
2// Copyright 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 floating point classification. The names are picked such that they
32// do not collide with macros. For example, "isnan" in C99 is a macro and hence
33// does not respect namespaces.
34//
35// TODO(keir): Finish porting!
36
37#ifndef CERES_PUBLIC_FPCLASSIFY_H_
38#define CERES_PUBLIC_FPCLASSIFY_H_
39
40#if defined(_MSC_VER)
41#include <float.h>
42#endif
43
44#include <limits>
45
46namespace ceres {
47
48#if defined(_MSC_VER)
49
50inline bool IsFinite  (double x) { return _finite(x) != 0;                   }
51inline bool IsInfinite(double x) { return _finite(x) == 0 && _isnan(x) == 0; }
52inline bool IsNaN     (double x) { return _isnan(x) != 0;                    }
53inline bool IsNormal  (double x) {
54  int classification = _fpclass(x);
55  return classification == _FPCLASS_NN ||
56         classification == _FPCLASS_PN;
57}
58
59#elif defined(ANDROID) && defined(_STLPORT_VERSION)
60
61// On Android, when using the STLPort, the C++ isnan and isnormal functions
62// are defined as macros.
63inline bool IsNaN     (double x) { return isnan(x);    }
64inline bool IsNormal  (double x) { return isnormal(x); }
65// On Android NDK r6, when using STLPort, the isinf and isfinite functions are
66// not available, so reimplement them.
67inline bool IsInfinite(double x) {
68  return x ==  std::numeric_limits<double>::infinity() ||
69         x == -std::numeric_limits<double>::infinity();
70}
71inline bool IsFinite(double x) {
72  return !isnan(x) && !IsInfinite(x);
73}
74
75# else
76
77// These definitions are for the normal Unix suspects.
78inline bool IsFinite  (double x) { return std::isfinite(x); }
79inline bool IsInfinite(double x) { return std::isinf(x);    }
80inline bool IsNaN     (double x) { return std::isnan(x);    }
81inline bool IsNormal  (double x) { return std::isnormal(x); }
82
83#endif
84
85}  // namespace ceres
86
87#endif  // CERES_PUBLIC_FPCLASSIFY_H_
88