98 lines
2.9 KiB
C++
98 lines
2.9 KiB
C++
// (C) Copyright Matt Borland 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_FMIN_HPP
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#define BOOST_MATH_CCMATH_FMIN_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/isnan.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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inline constexpr T fmin_impl(const T x, const T y) noexcept
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{
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if (x < y)
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{
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return x;
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}
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else
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{
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return y;
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}
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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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inline constexpr Real fmin(Real x, Real y) noexcept
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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::isnan(x) && boost::math::ccmath::isnan(y) ? std::numeric_limits<Real>::quiet_NaN() :
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boost::math::ccmath::isnan(x) ? y :
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boost::math::ccmath::isnan(y) ? x :
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boost::math::ccmath::detail::fmin_impl(x, y);
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}
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else
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{
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using std::fmin;
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return fmin(x, y);
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}
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}
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template <typename T1, typename T2>
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inline constexpr auto fmin(T1 x, T2 y) noexcept
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{
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if (BOOST_MATH_IS_CONSTANT_EVALUATED(x))
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{
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// If the type is an integer (e.g. epsilon == 0) then set the epsilon value to 1 so that type is at a minimum
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// cast to double
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constexpr auto T1p = std::numeric_limits<T1>::epsilon() > 0 ? std::numeric_limits<T1>::epsilon() : 1;
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constexpr auto T2p = std::numeric_limits<T2>::epsilon() > 0 ? std::numeric_limits<T2>::epsilon() : 1;
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using promoted_type =
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#ifndef BOOST_MATH_NO_LONG_DOUBLE_MATH_FUNCTIONS
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std::conditional_t<T1p <= LDBL_EPSILON && T1p <= T2p, T1,
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std::conditional_t<T2p <= LDBL_EPSILON && T2p <= T1p, T2,
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#endif
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std::conditional_t<T1p <= DBL_EPSILON && T1p <= T2p, T1,
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std::conditional_t<T2p <= DBL_EPSILON && T2p <= T1p, T2, double
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#ifndef BOOST_MATH_NO_LONG_DOUBLE_MATH_FUNCTIONS
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>>>>;
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#else
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>>;
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#endif
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return boost::math::ccmath::fmin(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::fmin;
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return fmin(x, y);
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}
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}
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inline constexpr float fminf(float x, float y) noexcept
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{
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return boost::math::ccmath::fmin(x, y);
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}
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#ifndef BOOST_MATH_NO_LONG_DOUBLE_MATH_FUNCTIONS
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inline constexpr long double fminl(long double x, long double y) noexcept
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{
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return boost::math::ccmath::fmin(x, y);
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}
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#endif
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} // Namespace boost::math::ccmath
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#endif // BOOST_MATH_CCMATH_FMIN_HPP
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