💿🐜 Antkeeper source code
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61 lines
1.5 KiB
61 lines
1.5 KiB
/*
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* Copyright (C) 2021 Christopher J. Howard
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*
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* This file is part of Antkeeper source code.
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*
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* Antkeeper source code is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* Antkeeper source code is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with Antkeeper source code. If not, see <http://www.gnu.org/licenses/>.
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*/
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#ifndef ANTKEEPER_MATH_COMPILE_HPP
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#define ANTKEEPER_MATH_COMPILE_HPP
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#include <concepts>
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namespace math {
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/// Compile-time mathematical functions.
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namespace compile {
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/**
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* Compile-time `pow` for unsigned integrals.
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*
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* @param x Base value.
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* @param e Integral exponent.
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*
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* @return `x^e`.
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*/
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template <std::unsigned_integral T>
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consteval T pow(T x, T e) noexcept
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{
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return (e == 0) ? T(1) : (x * pow<T>(x, e - 1));
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}
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/**
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* Compile-time `ceil(log2(x))` for unsigned integrals.
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*
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* @param x Input value.
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*
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* @return `ceil(log2(x))`.
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*/
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template <std::unsigned_integral T>
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consteval T ceil_log2(T x) noexcept
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{
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return (x <= T(1)) ? T(0) : ceil_log2((x + T(1)) / T(2)) + T(1);
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}
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} // namespace compile
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} // namespace math
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#endif // ANTKEEPER_MATH_COMPILE_HPP
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