78 lines
1.9 KiB
C++
78 lines
1.9 KiB
C++
// (C) Copyright Matt Borland 2021.
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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_MODF_HPP
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#define BOOST_MATH_CCMATH_MODF_HPP
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#include <cmath>
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#include <limits>
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#include <type_traits>
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#include <boost/math/tools/is_constant_evaluated.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/trunc.hpp>
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namespace boost::math::ccmath {
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namespace detail {
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template <typename Real>
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inline constexpr Real modf_error_impl(Real x, Real* iptr)
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{
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*iptr = x;
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return boost::math::ccmath::abs(x) == Real(0) ? x :
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x > Real(0) ? Real(0) : -Real(0);
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}
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template <typename Real>
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inline constexpr Real modf_nan_impl(Real x, Real* iptr)
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{
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*iptr = x;
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return x;
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}
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template <typename Real>
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inline constexpr Real modf_impl(Real x, Real* iptr)
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{
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*iptr = boost::math::ccmath::trunc(x);
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return (x - *iptr);
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}
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} // Namespace detail
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template <typename Real>
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inline constexpr Real modf(Real x, Real* iptr)
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{
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if(BOOST_MATH_IS_CONSTANT_EVALUATED(x))
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{
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return boost::math::ccmath::abs(x) == Real(0) ? detail::modf_error_impl(x, iptr) :
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boost::math::ccmath::isinf(x) ? detail::modf_error_impl(x, iptr) :
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boost::math::ccmath::isnan(x) ? detail::modf_nan_impl(x, iptr) :
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boost::math::ccmath::detail::modf_impl(x, iptr);
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}
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else
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{
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using std::modf;
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return modf(x, iptr);
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}
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}
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inline constexpr float modff(float x, float* iptr)
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{
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return boost::math::ccmath::modf(x, iptr);
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}
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#ifndef BOOST_MATH_NO_LONG_DOUBLE_MATH_FUNCTIONS
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inline constexpr long double modfl(long double x, long double* iptr)
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{
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return boost::math::ccmath::modf(x, iptr);
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}
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#endif
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} // Namespaces
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#endif // BOOST_MATH_CCMATH_MODF_HPP
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