MarmotConstants.h

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/* ---------------------------------------------------------------------
 *                                       _
 *  _ __ ___   __ _ _ __ _ __ ___   ___ | |_
 * | '_ ` _ \ / _` | '__| '_ ` _ \ / _ \| __|
 * | | | | | | (_| | |  | | | | | | (_) | |_
 * |_| |_| |_|\__,_|_|  |_| |_| |_|\___/ \__|
 *
 * Unit of Strength of Materials and Structural Analysis
 * University of Innsbruck,
 * 2020 - today
 *
 * festigkeitslehre@uibk.ac.at
 *
 * Matthias Neuner matthias.neuner@uibk.ac.at
 * Magdalena Schreter magdalena.schreter@uibk.ac.at
 *
 * This file is part of the MAteRialMOdellingToolbox (marmot).
 *
 * This library is free software; you can 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 marmot.
 * ---------------------------------------------------------------------
 */
 
#pragma once
#include <cmath>
 
namespace Marmot {
  namespace Constants {
    constexpr double Pi         = 3.141592653589793238463;
    constexpr double numZeroPos = 1e-16;
    inline double    cubicRootEps()
    {
      return std::pow( std::numeric_limits< double >::epsilon(), 1. / 3 );
    }
    inline double squareRootEps()
    {
      return std::pow( std::numeric_limits< double >::epsilon(), 0.5 );
    }
 
    const inline double SquareRootEps = squareRootEps();
    const inline double CubicRootEps  = cubicRootEps();
    constexpr double    sqrt3_8       = 0.61237243569579452454932101867647;
    constexpr double    sqrt2_3       = 0.8164965809277260327324280249019;
    constexpr double    sqrt3_2       = 1.2247448713915890490986420373529;
    constexpr double    sqrt2         = 1.4142135623730950488016887242097;
    constexpr double    sqrt3         = 1.7320508075688772935274463415059;
    constexpr double    sqrt6         = 2.4494897427831780981972840747059;
  } // namespace Constants
} // namespace Marmot