cmath.h

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// ---------------------------------------------------------------------
//
// Copyright (C) 2018 - 2019 by the deal.II authors
//
// This file is part of the deal.II library.
//
// The deal.II library is free software; you can use it, redistribute
// it, and/or modify it under the terms of the GNU Lesser General
// Public License as published by the Free Software Foundation; either
// version 2.1 of the License, or (at your option) any later version.
// The full text of the license can be found in the file LICENSE.md at
// the top level directory of deal.II.
//
// ---------------------------------------------------------------------
#ifndef dealii_cxx17_cmath_h
#define dealii_cxx17_cmath_h

#include <deal.II/base/config.h>

#ifndef __cpp_lib_math_special_functions
#  include <boost/math/special_functions/bessel.hpp>
#endif // __cpp_lib_math_special_functions

#include <cmath>

DEAL_II_NAMESPACE_OPEN
namespace std_cxx17
{
#ifndef __cpp_lib_math_special_functions
  double (&cyl_bessel_j)(double,
                         double) = boost::math::cyl_bessel_j<double, double>;
  float (&cyl_bessel_jf)(float,
                         float)  = boost::math::cyl_bessel_j<float, float>;
  long double (&cyl_bessel_jl)(long double, long double) =
    boost::math::cyl_bessel_j<long double, long double>;
#else
  using std::cyl_bessel_j;
  using std::cyl_bessel_jf;
  using std::cyl_bessel_jl;
#endif // __cpp_lib_math_special_functions
} // namespace std_cxx17
DEAL_II_NAMESPACE_CLOSE

#endif // dealii_cxx17_cmath_h