constants.hpp

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// OpenBEM - Copyright (C) 2026 Shashwat Sharma
 
// This file is part of OpenBEM.
 
// OpenBEM is free software: you can redistribute it and/or modify it under the terms of the
// GNU General Public License as published by the Free Software Foundation, either version 3
// of the License, or (at your option) any later version.
 
// You should have received a copy of the GNU General Public License along with OpenBEM.
// If not, see <https://www.gnu.org/licenses/>.
 
 
#ifndef CONSTANTS_H
#define CONSTANTS_H
 
#include <cmath>
#include <limits>
 
#include "types.hpp"
 
#ifndef M_PI
#define M_PI 3.1415926535897932384626
#endif
 
namespace bem
{
 
const Complex J = Complex(0.0, 1.0);
 
const Float zero = 0.0;
const Float one = 1.0;
const Float two = 2.0;
const Float four = 4.0;
const Float half = 0.5;
 
const Float pi = M_PI;
const Float two_pi = (Float)(2.0 * M_PI);
const Float four_pi = (Float)(4.0 * M_PI);
const Float half_pi = (Float)(0.5 * M_PI);
const Float quarter_pi = (Float)(M_PI / 4.0);
 
const Float eps0 = 8.854187817e-12;
 
const Float mu0 = four_pi * 1.0e-7;
 
const Float c0 = 1.0 / std::sqrt(eps0 * mu0);
 
const Float eta0 = std::sqrt(mu0 / eps0);
 
const Float inf = std::numeric_limits<Float>::infinity();
 
const Float float_eps = std::numeric_limits<Float>::epsilon();
 
}
 
#endif