// Ceres Solver - A fast non-linear least squares minimizer
// Copyright 2023 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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//   this list of conditions and the following disclaimer.
// * Redistributions in binary form must reproduce the above copyright notice,
//   this list of conditions and the following disclaimer in the documentation
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// Authors: keir@google.com (Keir Mierle), dgossow@google.com (David Gossow)
//
// Utility routine for comparing two values.

#ifndef CERES_INTERNAL_IS_CLOSE_H_
#define CERES_INTERNAL_IS_CLOSE_H_

#include "ceres/internal/disable_warnings.h"
#include "ceres/internal/export.h"

namespace ceres::internal {
// Returns true if x and y have a relative (unsigned) difference less than
// relative_precision and false otherwise. Stores the relative and absolute
// difference in relative/absolute_error if non-nullptr. If one of the two
// values is exactly zero, the absolute difference will be compared, and
// relative_error will be set to the absolute difference.
CERES_NO_EXPORT bool IsClose(double x,
                             double y,
                             double relative_precision,
                             double* relative_error,
                             double* absolute_error);
}  // namespace ceres::internal

#include "ceres/internal/reenable_warnings.h"

#endif  // CERES_INTERNAL_IS_CLOSE_H_
