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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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Copyright (c) 2011-2013 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_FRAC_INT_HPP
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#define SPROUT_MATH_FRAC_INT_HPP
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#include <type_traits>
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#include <sprout/config.hpp>
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#include <sprout/limits.hpp>
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#include <sprout/math/detail/config.hpp>
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#include <sprout/math/copysign.hpp>
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#include <sprout/math/isnan.hpp>
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#include <sprout/math/integer_part.hpp>
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#include <sprout/type_traits/enabler_if.hpp>
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#include <sprout/utility/pair/pair.hpp>
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namespace sprout {
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namespace math {
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namespace detail {
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template<typename T>
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inline SPROUT_CONSTEXPR sprout::pair<T, T>
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frac_int_impl(T x, T ipart) {
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typedef sprout::pair<T, T> type;
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return sprout::math::isnan(x) ? type(x, ipart)
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: x == sprout::numeric_limits<T>::infinity() || x == -sprout::numeric_limits<T>::infinity() ? type(sprout::math::copysign(T(0), x), ipart)
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: x == 0 ? type(x, ipart)
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: x == ipart ? type(T(0) * x, ipart)
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: type(sprout::math::copysign(x - ipart, x), ipart)
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;
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}
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} // namespace detail
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//
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// frac_int
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//
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template<
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typename FloatType,
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typename sprout::enabler_if<std::is_floating_point<FloatType>::value>::type = sprout::enabler
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>
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inline SPROUT_CONSTEXPR sprout::pair<FloatType, FloatType>
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frac_int(FloatType x) {
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return sprout::math::detail::frac_int_impl(x, sprout::integer_part(x));
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}
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template<
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typename IntType,
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typename sprout::enabler_if<std::is_integral<IntType>::value>::type = sprout::enabler
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>
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inline SPROUT_CONSTEXPR sprout::pair<double, double>
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frac_int(IntType x) {
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return sprout::math::frac_int(static_cast<double>(x));
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}
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} // namespace math
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using sprout::math::frac_int;
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} // namespace sprout
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#endif // #ifndef SPROUT_MATH_FRAC_INT_HPP
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