// Ceres Solver - A fast non-linear least squares minimizer

// Copyright 2015 Google Inc. All rights reserved.

// http://ceres-solver.org/

//

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// modification, are permitted provided that the following conditions are met:

//

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// Author: keir@google.com (Keir Mierle)

//

// Portable floating point classification. The names are picked such that they

// do not collide with macros. For example, "isnan" in C99 is a macro and hence

// does not respect namespaces.

//

// TODO(keir): Finish porting!

#ifndef CERES_PUBLIC_FPCLASSIFY_H_

#define CERES_PUBLIC_FPCLASSIFY_H_

#if defined(_MSC_VER)

#include <float.h>

#endif

#include <limits>

namespace ceres {

#if defined(_MSC_VER)

inline bool IsFinite  (double x) { return _finite(x) != 0;                   }

inline bool IsInfinite(double x) { return _finite(x) == 0 && _isnan(x) == 0; }

inline bool IsNaN     (double x) { return _isnan(x) != 0;                    }

inline bool IsNormal  (double x) {  // NOLINT

  const int classification = _fpclass(x);

  return (classification == _FPCLASS_NN || classification == _FPCLASS_PN);

}

# else

// These definitions are for the normal Unix suspects.

inline bool IsFinite  (double x) { return std::isfinite(x); }

inline bool IsInfinite(double x) { return std::isinf(x);    }

inline bool IsNaN     (double x) { return std::isnan(x);    }

inline bool IsNormal  (double x) { return std::isnormal(x); }

#endif

}  // namespace ceres

#endif  // CERES_PUBLIC_FPCLASSIFY_H_