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// (C) Copyright Matt Borland 2021.
// Use, modification and distribution are subject to the
// Boost Software License, Version 1.0. (See accompanying file
// LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
#ifndef BOOST_MATH_CCMATH_MODF_HPP
#define BOOST_MATH_CCMATH_MODF_HPP
#include <boost/math/ccmath/detail/config.hpp>
#ifdef BOOST_MATH_NO_CCMATH
#error "The header <boost/math/modf.hpp> can only be used in C++17 and later."
#endif
#include <boost/math/ccmath/abs.hpp>
#include <boost/math/ccmath/isinf.hpp>
#include <boost/math/ccmath/isnan.hpp>
#include <boost/math/ccmath/trunc.hpp>
namespace boost::math::ccmath {
namespace detail {
template <typename Real>
inline constexpr Real modf_error_impl(Real x, Real* iptr)
{
*iptr = x;
return boost::math::ccmath::abs(x) == Real(0) ? x :
x > Real(0) ? Real(0) : -Real(0);
}
template <typename Real>
inline constexpr Real modf_nan_impl(Real x, Real* iptr)
{
*iptr = x;
return x;
}
template <typename Real>
inline constexpr Real modf_impl(Real x, Real* iptr)
{
*iptr = boost::math::ccmath::trunc(x);
return (x - *iptr);
}
} // Namespace detail
template <typename Real>
inline constexpr Real modf(Real x, Real* iptr)
{
if(BOOST_MATH_IS_CONSTANT_EVALUATED(x))
{
return boost::math::ccmath::abs(x) == Real(0) ? detail::modf_error_impl(x, iptr) :
boost::math::ccmath::isinf(x) ? detail::modf_error_impl(x, iptr) :
boost::math::ccmath::isnan(x) ? detail::modf_nan_impl(x, iptr) :
boost::math::ccmath::detail::modf_impl(x, iptr);
}
else
{
using std::modf;
return modf(x, iptr);
}
}
inline constexpr float modff(float x, float* iptr)
{
return boost::math::ccmath::modf(x, iptr);
}
#ifndef BOOST_MATH_NO_LONG_DOUBLE_MATH_FUNCTIONS
inline constexpr long double modfl(long double x, long double* iptr)
{
return boost::math::ccmath::modf(x, iptr);
}
#endif
} // Namespaces
#endif // BOOST_MATH_CCMATH_MODF_HPP
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