107 lines
2.6 KiB
C++
107 lines
2.6 KiB
C++
// (C) Copyright Matt Borland 2021 - 2022.
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// Use, modification and distribution are subject to the
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// Boost Software License, Version 1.0. (See accompanying file
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// LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
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#ifndef BOOST_MATH_CCMATH_REMAINDER_HPP
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#define BOOST_MATH_CCMATH_REMAINDER_HPP
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#include <boost/math/ccmath/detail/config.hpp>
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#ifdef BOOST_MATH_NO_CCMATH
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#error "The header <boost/math/remainder.hpp> can only be used in C++17 and later."
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#endif
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#include <cstdint>
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#include <boost/math/tools/promotion.hpp>
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#include <boost/math/ccmath/abs.hpp>
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#include <boost/math/ccmath/isinf.hpp>
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#include <boost/math/ccmath/isnan.hpp>
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#include <boost/math/ccmath/isfinite.hpp>
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#include <boost/math/ccmath/modf.hpp>
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namespace boost::math::ccmath {
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namespace detail {
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template <typename T>
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constexpr T remainder_impl(const T x, const T y)
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{
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T n = 0;
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if (T fractional_part = boost::math::ccmath::modf((x / y), &n); fractional_part > static_cast<T>(1.0/2))
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{
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++n;
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}
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else if (fractional_part < static_cast<T>(-1.0/2))
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{
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--n;
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}
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return x - n*y;
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}
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} // Namespace detail
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template <typename Real, std::enable_if_t<!std::is_integral_v<Real>, bool> = true>
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constexpr Real remainder(Real x, Real y)
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{
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if (BOOST_MATH_IS_CONSTANT_EVALUATED(x))
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{
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if (boost::math::ccmath::isinf(x) && !boost::math::ccmath::isnan(y))
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{
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return std::numeric_limits<Real>::quiet_NaN();
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}
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else if (boost::math::ccmath::abs(y) == static_cast<Real>(0) && !boost::math::ccmath::isnan(x))
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{
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return std::numeric_limits<Real>::quiet_NaN();
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}
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else if (boost::math::ccmath::isnan(x))
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{
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return x;
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}
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else if (boost::math::ccmath::isnan(y))
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{
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return y;
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}
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return boost::math::ccmath::detail::remainder_impl(x, y);
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}
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else
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{
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using std::remainder;
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return remainder(x, y);
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}
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}
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template <typename T1, typename T2>
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constexpr auto remainder(T1 x, T2 y)
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{
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if (BOOST_MATH_IS_CONSTANT_EVALUATED(x))
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{
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using promoted_type = boost::math::tools::promote_args_t<T1, T2>;
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return boost::math::ccmath::remainder(promoted_type(x), promoted_type(y));
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}
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else
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{
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using std::remainder;
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return remainder(x, y);
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}
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}
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constexpr float remainderf(float x, float y)
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{
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return boost::math::ccmath::remainder(x, y);
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}
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#ifndef BOOST_MATH_NO_LONG_DOUBLE_MATH_FUNCTIONS
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constexpr long double remainderl(long double x, long double y)
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{
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return boost::math::ccmath::remainder(x, y);
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}
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#endif
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} // Namespaces
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#endif // BOOST_MATH_CCMATH_REMAINDER_HPP
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