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
46 namespace ceres {
47
48 #if defined(_MSC_VER)
49
IsFinite(double x)50 inline bool IsFinite (double x) { return _finite(x) != 0; }
IsInfinite(double x)51 inline bool IsInfinite(double x) { return _finite(x) == 0 && _isnan(x) == 0; }
IsNaN(double x)52 inline bool IsNaN (double x) { return _isnan(x) != 0; }
IsNormal(double x)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_
88