// 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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//   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
//   and/or other materials provided with the distribution.
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//   used to endorse or promote products derived from this software without
//   specific prior written permission.
//
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// AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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// Author: sameeragarwal@google.com (Sameer Agarwal)

#include "ceres/function_sample.h"
#include "ceres/stringprintf.h"

namespace ceres {
namespace internal {

FunctionSample::FunctionSample()
    : x(0.0),
      vector_x_is_valid(false),
      value(0.0),
      value_is_valid(false),
      vector_gradient_is_valid(false),
      gradient(0.0),
      gradient_is_valid(false) {}

FunctionSample::FunctionSample(const double x, const double value)
    : x(x),
      vector_x_is_valid(false),
      value(value),
      value_is_valid(true),
      vector_gradient_is_valid(false),
      gradient(0.0),
      gradient_is_valid(false) {}

FunctionSample::FunctionSample(const double x,
                               const double value,
                               const double gradient)
    : x(x),
      vector_x_is_valid(false),
      value(value),
      value_is_valid(true),
      vector_gradient_is_valid(false),
      gradient(gradient),
      gradient_is_valid(true) {}

std::string FunctionSample::ToDebugString() const {
  return StringPrintf("[x: %.8e, value: %.8e, gradient: %.8e, "
                      "value_is_valid: %d, gradient_is_valid: %d]",
                      x, value, gradient, value_is_valid, gradient_is_valid);
}

}  // namespace internal
}  // namespace ceres