1 // Ceres Solver - A fast non-linear least squares minimizer
2 // Copyright 2015 Google Inc. All rights reserved.
3 // http://ceres-solver.org/
5 // Redistribution and use in source and binary forms, with or without
6 // modification, are permitted provided that the following conditions are met:
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.
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
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26 // ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
27 // POSSIBILITY OF SUCH DAMAGE.
29 // Author: keir@google.com (Keir Mierle)
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.
35 // TODO(keir): Finish porting!
37 #ifndef CERES_PUBLIC_FPCLASSIFY_H_
38 #define CERES_PUBLIC_FPCLASSIFY_H_
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) { // NOLINT
54 const int classification = _fpclass(x);
55 return (classification == _FPCLASS_NN || classification == _FPCLASS_PN);
60 // These definitions are for the normal Unix suspects.
61 inline bool IsFinite (double x) { return std::isfinite(x); }
62 inline bool IsInfinite(double x) { return std::isinf(x); }
63 inline bool IsNaN (double x) { return std::isnan(x); }
64 inline bool IsNormal (double x) { return std::isnormal(x); }
70 #endif // CERES_PUBLIC_FPCLASSIFY_H_