Cos.hh

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/* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *\
 * Copyright (c) 2025, Davide Stocco, Mattia Piazza and Enrico Bertolazzi.                       *
 *                                                                                               *
 * The Optimist project is distributed under the BSD 2-Clause License.                           *
 *                                                                                               *
 * Davide Stocco                          Mattia Piazza                        Enrico Bertolazzi *
 * University of Trento               University of Trento                  University of Trento *
 * davide.stocco@unitn.it            mattia.piazza@unitn.it           enrico.bertolazzi@unitn.it *
\* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */
 
#pragma once
 
#ifndef OPTIMIST_TESTSET_COS_HH
#define OPTIMIST_TESTSET_COS_HH
 
#include "Optimist/TestSet.hh"
 
namespace Optimist
{
 
  namespace TestSet
  {

    template <typename Real>
    class Cos : public Function<Real, 1, 1, Cos<Real>>
    {
    public:
      OPTIMIST_BASIC_CONSTANTS(Real)
 
      
      Cos()
      {
        this->m_solutions.emplace_back(-M_PI/2.0); // Zero
        this->m_solutions.emplace_back(M_PI/2.0); // Zero
        this->m_solutions.emplace_back(-M_PI); // Minimum
        this->m_solutions.emplace_back(M_PI); // Minimum
        this->m_guesses.emplace_back(-3.0/8.0*M_PI);
        this->m_guesses.emplace_back(3.0/8.0*M_PI);
      }

      std::string name_impl() const {return "Cos";}

      bool evaluate_impl(Real x, Real & out) const
      {
        out = std::cos(x);
        return std::isfinite(out);
      }

      bool first_derivative_impl(Real x, Real & out) const
      {
        out = -std::sin(x);
        return std::isfinite(out);
      }

      bool second_derivative_impl(Real x, Real & out) const
      {
        out = -std::cos(x);
        return std::isfinite(out);
      }
 
    }; // class Cos
 
  } // namespace TestSet
 
} // namespace Optimist
 
#endif // OPTIMIST_TESTSET_COS_HH