fpclassify.h
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1 // Ceres Solver - A fast non-linear least squares minimizer
2 // Copyright 2012 Google Inc. All rights reserved.
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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 
46 namespace ceres {
47 
48 #if defined(_MSC_VER)
49 
50 inline bool IsFinite (double x) { return _finite(x) != 0; }
51 inline bool IsInfinite(double x) { return _finite(x) == 0 && _isnan(x) == 0; }
52 inline bool IsNaN (double x) { return _isnan(x) != 0; }
53 inline 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.
63 inline bool IsNaN (double x) { return isnan(x); }
64 inline 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.
67 inline bool IsInfinite(double x) {
68  return x == std::numeric_limits<double>::infinity() ||
69  x == -std::numeric_limits<double>::infinity();
70 }
71 inline bool IsFinite(double x) {
72  return !isnan(x) && !IsInfinite(x);
73 }
74 
75 # else
76 
77 // These definitions are for the normal Unix suspects.
78 inline bool IsFinite (double x) { return std::isfinite(x); }
79 inline bool IsInfinite(double x) { return std::isinf(x); }
80 inline bool IsNaN (double x) { return std::isnan(x); }
81 inline bool IsNormal (double x) { return std::isnormal(x); }
82 
83 #endif
84 
85 } // namespace ceres
86 
87 #endif // CERES_PUBLIC_FPCLASSIFY_H_
bool IsInfinite(double x)
Definition: fpclassify.h:79
#define isfinite(X)
Definition: main.h:95
#define isinf(X)
Definition: main.h:94
bool IsNaN(double x)
Definition: fpclassify.h:80
bool IsNormal(double x)
Definition: fpclassify.h:81
bool IsFinite(double x)
Definition: fpclassify.h:78
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#define isnan(X)
Definition: main.h:93


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autogenerated on Tue Jul 4 2023 02:34:14