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 (at) 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_ 88
