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 46namespace ceres { 47 48#if defined(_MSC_VER) 49 50inline bool IsFinite (double x) { return _finite(x) != 0; } 51inline bool IsInfinite(double x) { return _finite(x) == 0 && _isnan(x) == 0; } 52inline bool IsNaN (double x) { return _isnan(x) != 0; } 53inline 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. 63inline bool IsNaN (double x) { return isnan(x); } 64inline 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. 67inline bool IsInfinite(double x) { 68 return x == std::numeric_limits<double>::infinity() || 69 x == -std::numeric_limits<double>::infinity(); 70} 71inline bool IsFinite(double x) { 72 return !isnan(x) && !IsInfinite(x); 73} 74 75# else 76 77// These definitions are for the normal Unix suspects. 78inline bool IsFinite (double x) { return std::isfinite(x); } 79inline bool IsInfinite(double x) { return std::isinf(x); } 80inline bool IsNaN (double x) { return std::isnan(x); } 81inline bool IsNormal (double x) { return std::isnormal(x); } 82 83#endif 84 85} // namespace ceres 86 87#endif // CERES_PUBLIC_FPCLASSIFY_H_ 88