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 inline bool IsFinite (double x) { return _finite(x); } 50 inline bool IsInfinite(double x) { return !_finite(x) && !_isnan(x); } 51 inline bool IsNaN (double x) { return _isnan(x); } 52 inline bool IsNormal (double x) { 53 int classification = _fpclass(x); 54 return classification == _FPCLASS_NN || 55 classification == _FPCLASS_PN; 56 } 57 #elif defined(ANDROID) 58 59 // On Android when using the GNU STL, the C++ fpclassify functions are not 60 // available. Strictly speaking, the std functions are are not standard until 61 // C++11. Instead use the C99 macros on Android. 62 inline bool IsNaN (double x) { return isnan(x); } 63 inline bool IsNormal (double x) { return isnormal(x); } 64 65 // On Android NDK r6, when using STLPort, the isinf and isfinite functions are 66 // not available, so reimplement them. 67 # if defined(_STLPORT_VERSION) 68 inline bool IsInfinite(double x) { 69 return x == std::numeric_limits<double>::infinity() || 70 x == -std::numeric_limits<double>::infinity(); 71 } 72 inline bool IsFinite(double x) { 73 return !isnan(x) && !IsInfinite(x); 74 } 75 # else 76 inline bool IsFinite (double x) { return isfinite(x); } 77 inline bool IsInfinite(double x) { return isinf(x); } 78 # endif // defined(_STLPORT_VERSION) 79 #else 80 // These definitions are for the normal Unix suspects. 81 // TODO(keir): Test the "else" with more platforms. 82 inline bool IsFinite (double x) { return std::isfinite(x); } 83 inline bool IsInfinite(double x) { return std::isinf(x); } 84 inline bool IsNaN (double x) { return std::isnan(x); } 85 inline bool IsNormal (double x) { return std::isnormal(x); } 86 #endif 87 88 } // namespace ceres 89 90 #endif // CERES_PUBLIC_FPCLASSIFY_H_ 91
