CoreMath.h

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/*
 *  File:       CoreMath.h
 *
 *  Created:    18/03/2017
 *
 *  This file is part of WECore.
 *
 *  WECore 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.
 *
 *  WECore is distributed in the hope that it will be useful,
 *  but WITHOUT ANY WARRANTY; without even the implied warranty of
 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *  GNU General Public License for more details.
 *
 *  You should have received a copy of the GNU General Public License
 *  along with WECore.  If not, see <http://www.gnu.org/licenses/>.
 */
 
#ifndef CoreMath_h
#define CoreMath_h
 
#include <cmath>
#include <limits>
 
namespace WECore::CoreMath {
    constexpr long double LONG_PI {3.14159265358979323846264338327950288};
    constexpr double DOUBLE_PI {static_cast<double>(LONG_PI)};
 
    constexpr long double LONG_TAU {2 * LONG_PI};
    constexpr double DOUBLE_TAU {static_cast<double>(LONG_TAU)};
 
    constexpr long double LONG_E {2.71828182845904523536028747135266250};
    constexpr double DOUBLE_E {static_cast<double>(LONG_E)};
 
    template <typename T>
    bool compareFloatsEqual(T x, T y, T tolerance = std::numeric_limits<T>::epsilon()) {
        return std::abs(x - y) < tolerance;
    }
 
    constexpr double MINUS_INF_DB {-200};
    inline double linearTodB(double val) { return val > 0 ? std::fmax(20 * std::log10(val), MINUS_INF_DB) : MINUS_INF_DB; }
    inline double dBToLinear(double val) { return std::pow(10.0, val / 20.0); }
}
 
#endif /* CoreMath_h */