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https://github.com/bolero-MURAKAMI/Sprout.git
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60 lines
2.1 KiB
C++
60 lines
2.1 KiB
C++
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/*=============================================================================
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Copyright (c) 2011-2014 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_COMPLEX_POW_HPP
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#define SPROUT_COMPLEX_POW_HPP
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#include <sprout/config.hpp>
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#include <sprout/math/pow.hpp>
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#include <sprout/complex/complex.hpp>
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#include <sprout/complex/operators.hpp>
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#include <sprout/complex/exp.hpp>
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#include <sprout/complex/log.hpp>
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namespace sprout {
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//
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// pow
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//
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// G.6.4.1 The cpow functions
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// 1 The cpow functions raise floating-point exceptions if appropriate for the calculation of
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// the parts of the result, and may raise spurious exceptions.317)
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//
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// 317) This allows cpow(z, c) to be implemented as cexp(c clog(z)) without precluding
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// implementations that treat special cases more carefully.
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//
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template<typename T>
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inline SPROUT_CONSTEXPR sprout::complex<T>
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pow(sprout::complex<T> const& x, sprout::complex<T> const& y) {
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return x == T() ? T()
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: sprout::exp(y * sprout::log(x))
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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::complex<T> pow_impl(sprout::complex<T> const& t, T const& y) {
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return sprout::polar(sprout::exp(y * t.real()), y * t.imag());
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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::complex<T>
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pow(sprout::complex<T> const& x, T const& y) {
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return x == T() ? T()
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: x.imag() == T() && x.real() > T() ? sprout::math::pow(x.real(), y)
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: sprout::detail::pow_impl(sprout::log(x), y)
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;
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}
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template<typename T>
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inline SPROUT_CONSTEXPR sprout::complex<T>
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pow(T const& x, sprout::complex<T> const& y) {
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return x > T() ? sprout::polar(sprout::pow(x, y.real()), y.imag() * sprout::log(x))
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: sprout::pow(sprout::complex<T>(x), y)
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;
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}
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} // namespace sprout
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#endif // #ifndef SPROUT_COMPLEX_POW_HPP
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