trigonometricfunction.hh

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// -*- tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 2 -*-
// vi: set et ts=4 sw=2 sts=2:
 
// SPDX-FileCopyrightText: Copyright © DUNE Project contributors, see file AUTHORS.md
// SPDX-License-Identifier: LicenseRef-GPL-2.0-only-with-DUNE-exception OR LGPL-3.0-or-later
 
#ifndef DUNE_FUNCTIONS_ANALYTICFUNCTIONS_TRIGONOMETRICFUNCTION_HH
#define DUNE_FUNCTIONS_ANALYTICFUNCTIONS_TRIGONOMETRICFUNCTION_HH
 
#include <cmath>
 
namespace Dune {
namespace Functions {
 
 
 
template<class K, int sinFactor, int cosFactor>
class TrigonometricFunction
{
public:
  K operator () (const K& x) const
  {
    return sinFactor * std::sin(x) + cosFactor * std::cos(x);
  }
};
 
 
template<class K, int sinFactor, int cosFactor>
TrigonometricFunction<K, -cosFactor, sinFactor> derivative(const TrigonometricFunction<K, sinFactor, cosFactor>& f)
{
  return TrigonometricFunction<K, -cosFactor, sinFactor>();
}
 
 
 
}} // namespace Dune::Functions
 
 
 
#endif // DUNE_FUNCTIONS_ANALYTICFUNCTIONS_TRIGONOMETRICFUNCTION_HH