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45 lines
1.5 KiB
C++
45 lines
1.5 KiB
C++
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/*=============================================================================
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Copyright (c) 2011-2016 Bolero MURAKAMI
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https://github.com/bolero-MURAKAMI/Sprout
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Distributed under the Boost Software License, Version 1.0. (See accompanying
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file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
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=============================================================================*/
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#ifndef SPROUT_MATH_QUATERNION_POW_HPP
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#define SPROUT_MATH_QUATERNION_POW_HPP
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#include <sprout/config.hpp>
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#include <sprout/math/quaternion/quaternion.hpp>
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namespace sprout {
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namespace math {
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//
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// pow
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//
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namespace detail {
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template<typename T>
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inline SPROUT_CONSTEXPR sprout::math::quaternion<T>
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pow_q_impl(sprout::math::quaternion<T> const& q, int n, int m, sprout::math::quaternion<T> const& result) {
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return n != m << 1 ? result * result * q
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: result * result
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;
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}
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} // namespace detail
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template<typename T>
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inline SPROUT_CONSTEXPR sprout::math::quaternion<T>
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pow(sprout::math::quaternion<T> const& q, int n) {
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return n > 1 ? sprout::math::detail::pow_q_impl(
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q, n, n >> 1, sprout::math::pow(q, n >> 1)
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)
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: n == 1 ? q
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: n == 0 ? sprout::math::quaternion<T>(static_cast<T>(1))
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: sprout::math::pow(sprout::math::quaternion<T>(static_cast<T>(1)) / q, -n)
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;
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}
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} // namespace math
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using sprout::math::pow;
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} // namespace sprout
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#endif // #ifndef SPROUT_MATH_QUATERNION_POW_HPP
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