ipow.hpp

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// SPDX-License-Identifier: BSL-1.0
// SPDX-FileCopyrightText: Copyright (C) 2023 Tobias Hienzsch
 
#ifndef TETL_MATH_IPOW_HPP
#define TETL_MATH_IPOW_HPP
 
#include <etl/_concepts/integral.hpp>
 
namespace etl {
 
template <integral Int>
[[nodiscard]] constexpr auto ipow(Int base, Int exponent) noexcept -> Int
{
    auto result = Int(1);
    for (auto i = Int(0); i < exponent; ++i) {
        result *= base;
    }
    return result;
}
 
template <auto Base>
[[nodiscard]] constexpr auto ipow(decltype(Base) exponent) noexcept -> decltype(Base)
{
    using Int = decltype(Base);
 
    if constexpr (Base == Int(2)) {
        return static_cast<Int>(Int(1) << exponent);
    } else {
        return ipow(Base, exponent);
    }
}
 
} // namespace etl
 
#endif // TETL_MATH_IPOW_HPP