constants.hpp

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// -------------------------------------------------------//
//
// SHAMROCK code for hydrodynamics
// Copyright (c) 2021-2026 Timothée David--Cléris <tim.shamrock@proton.me>
// SPDX-License-Identifier: CeCILL Free Software License Agreement v2.1
// Shamrock is licensed under the CeCILL 2.1 License, see LICENSE for more information
//
// -------------------------------------------------------//
 
#pragma once
 
namespace shambase::constants {
 
    // clang-format off
    template<class T> constexpr T unity = 1;
    template<class T> constexpr T zero = 0;
    template<class T> constexpr T pi = 3.141592653589793116;
    template<class T> constexpr T tau = 6.283185307179586232;
    template<class T> constexpr T pi_square = 9.8696044010893579923;
    template<class T> constexpr T pi2_sqrt = 2.5066282746310002416;
    template<class T> constexpr T gamma_1_6 = 5.5663160017802360002;
    template<class T> constexpr T gamma_1_5 = 4.590843711998803478;
    template<class T> constexpr T gamma_1_4 = 3.6256099082219086505;
    template<class T> constexpr T gamma_1_3 = 2.6789385347077478983;
    template<class T> constexpr T gamma_2_5 = 2.2181595437576877572;
    template<class T> constexpr T gamma_1_2 = 1.7724538509055158819;
    template<class T> constexpr T gamma_3_5 = 1.4891922488128168656;
    template<class T> constexpr T gamma_2_3 = 1.3541179394264004632;
    template<class T> constexpr T gamma_3_4 = 1.225416702465177865;
    template<class T> constexpr T gamma_4_5 = 1.1642297137253030392;
    template<class T> constexpr T gamma_5_6 = 1.1287870299081257386;
    template<class T> constexpr T gamma_1 = 1;
    template<class T> constexpr T sqrt_2 = 1.4142135623730951455;
    template<class T> constexpr T sqrt_pi = 1.7724538509055158819; // same as gamma_1_2
    template<class T> constexpr T e = 2.7182818284590450908;
    // clang-format on
 
} // namespace shambase::constants