mirror of
https://github.com/bolero-MURAKAMI/Sprout.git
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87 lines
3.1 KiB
C++
87 lines
3.1 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_REMAINDER_HPP
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#define SPROUT_MATH_REMAINDER_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/isnan.hpp>
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#include <sprout/math/signbit.hpp>
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#include <sprout/math/rem_quo.hpp>
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#include <sprout/type_traits/enabler_if.hpp>
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#include <sprout/type_traits/float_promote.hpp>
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namespace sprout {
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namespace math {
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namespace detail {
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#if SPROUT_USE_BUILTIN_CMATH_FUNCTION
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inline SPROUT_CONSTEXPR float
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builtin_remainder(float x, float y) {
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return __builtin_remainderf(x, y);
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}
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inline SPROUT_CONSTEXPR double
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builtin_remainder(double x, double y) {
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return __builtin_remainder(x, y);
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}
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inline SPROUT_CONSTEXPR long double
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builtin_remainder(long double x, long double y) {
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return __builtin_remainderl(x, y);
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}
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#endif
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} // namespace detail
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//
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// remainder
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//
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// issue:
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// remainder(-NaN, -NaN) returns -NaN .
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// # returns +NaN . ( same as remainder(+NaN, +NaN) )
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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 FloatType
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remainder(FloatType x, FloatType y) {
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return y == 0 ? -sprout::numeric_limits<FloatType>::quiet_NaN()
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: sprout::math::isnan(y)
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? sprout::math::isnan(x)
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? sprout::math::signbit(y) && sprout::math::signbit(x) ? -sprout::numeric_limits<FloatType>::quiet_NaN()
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: sprout::numeric_limits<FloatType>::quiet_NaN()
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: y
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: sprout::math::isnan(x) ? x
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: x == sprout::numeric_limits<FloatType>::infinity() || x == -sprout::numeric_limits<FloatType>::infinity()
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? -sprout::numeric_limits<FloatType>::quiet_NaN()
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: x == 0 ? x
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: y == sprout::numeric_limits<FloatType>::infinity() || y == -sprout::numeric_limits<FloatType>::infinity() ? x
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#if SPROUT_USE_BUILTIN_CMATH_FUNCTION
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: sprout::math::detail::builtin_remainder(x, y)
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#else
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: sprout::math::rem_quo(x, y).first
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#endif
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;
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}
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template<
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typename ArithmeticType1,
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typename ArithmeticType2,
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typename sprout::enabler_if<
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std::is_arithmetic<ArithmeticType1>::value && std::is_arithmetic<ArithmeticType2>::value
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>::type = sprout::enabler
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>
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inline SPROUT_CONSTEXPR typename sprout::float_promote<ArithmeticType1, ArithmeticType2>::type
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remainder(ArithmeticType1 x, ArithmeticType2 y) {
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typedef typename sprout::float_promote<ArithmeticType1, ArithmeticType2>::type type;
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return sprout::math::remainder(static_cast<type>(x), static_cast<type>(y));
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}
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} // namespace math
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using sprout::math::remainder;
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} // namespace sprout
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#endif // #ifndef SPROUT_MATH_REMAINDER_HPP
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