98 lines
2.9 KiB
C++
98 lines
2.9 KiB
C++
|
// (C) Copyright Matt Borland 2022.
|
||
|
|
// 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_FMIN_HPP
|
||
|
|
#define BOOST_MATH_CCMATH_FMIN_HPP
|
||
|
|
|
||
|
|
#include <cmath>
|
||
|
|
#include <limits>
|
||
|
|
#include <type_traits>
|
||
|
|
#include <boost/math/tools/is_constant_evaluated.hpp>
|
||
|
|
#include <boost/math/ccmath/isnan.hpp>
|
||
|
|
|
||
|
|
namespace boost::math::ccmath {
|
||
|
|
|
||
|
|
namespace detail {
|
||
|
|
|
||
|
|
template <typename T>
|
||
|
|
inline constexpr T fmin_impl(const T x, const T y) noexcept
|
||
|
|
{
|
||
|
|
if (x < y)
|
||
|
|
{
|
||
|
|
return x;
|
||
|
|
}
|
||
|
|
else
|
||
|
|
{
|
||
|
|
return y;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
} // Namespace detail
|
||
|
|
|
||
|
|
template <typename Real, std::enable_if_t<!std::is_integral_v<Real>, bool> = true>
|
||
|
|
inline constexpr Real fmin(Real x, Real y) noexcept
|
||
|
|
{
|
||
|
|
if (BOOST_MATH_IS_CONSTANT_EVALUATED(x))
|
||
|
|
{
|
||
|
|
return boost::math::ccmath::isnan(x) && boost::math::ccmath::isnan(y) ? std::numeric_limits<Real>::quiet_NaN() :
|
||
|
|
boost::math::ccmath::isnan(x) ? y :
|
||
|
|
boost::math::ccmath::isnan(y) ? x :
|
||
|
|
boost::math::ccmath::detail::fmin_impl(x, y);
|
||
|
|
}
|
||
|
|
else
|
||
|
|
{
|
||
|
|
using std::fmin;
|
||
|
|
return fmin(x, y);
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
template <typename T1, typename T2>
|
||
|
|
inline constexpr auto fmin(T1 x, T2 y) noexcept
|
||
|
|
{
|
||
|
|
if (BOOST_MATH_IS_CONSTANT_EVALUATED(x))
|
||
|
|
{
|
||
|
|
// If the type is an integer (e.g. epsilon == 0) then set the epsilon value to 1 so that type is at a minimum
|
||
|
|
// cast to double
|
||
|
|
constexpr auto T1p = std::numeric_limits<T1>::epsilon() > 0 ? std::numeric_limits<T1>::epsilon() : 1;
|
||
|
|
constexpr auto T2p = std::numeric_limits<T2>::epsilon() > 0 ? std::numeric_limits<T2>::epsilon() : 1;
|
||
|
|
|
||
|
|
using promoted_type =
|
||
|
|
#ifndef BOOST_MATH_NO_LONG_DOUBLE_MATH_FUNCTIONS
|
||
|
|
std::conditional_t<T1p <= LDBL_EPSILON && T1p <= T2p, T1,
|
||
|
|
std::conditional_t<T2p <= LDBL_EPSILON && T2p <= T1p, T2,
|
||
|
|
#endif
|
||
|
|
std::conditional_t<T1p <= DBL_EPSILON && T1p <= T2p, T1,
|
||
|
|
std::conditional_t<T2p <= DBL_EPSILON && T2p <= T1p, T2, double
|
||
|
|
#ifndef BOOST_MATH_NO_LONG_DOUBLE_MATH_FUNCTIONS
|
||
|
|
>>>>;
|
||
|
|
#else
|
||
|
|
>>;
|
||
|
|
#endif
|
||
|
|
|
||
|
|
return boost::math::ccmath::fmin(promoted_type(x), promoted_type(y));
|
||
|
|
}
|
||
|
|
else
|
||
|
|
{
|
||
|
|
using std::fmin;
|
||
|
|
return fmin(x, y);
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
inline constexpr float fminf(float x, float y) noexcept
|
||
|
|
{
|
||
|
|
return boost::math::ccmath::fmin(x, y);
|
||
|
|
}
|
||
|
|
|
||
|
|
#ifndef BOOST_MATH_NO_LONG_DOUBLE_MATH_FUNCTIONS
|
||
|
|
inline constexpr long double fminl(long double x, long double y) noexcept
|
||
|
|
{
|
||
|
|
return boost::math::ccmath::fmin(x, y);
|
||
|
|
}
|
||
|
|
#endif
|
||
|
|
|
||
|
|
} // Namespace boost::math::ccmath
|
||
|
|
|
||
|
|
#endif // BOOST_MATH_CCMATH_FMIN_HPP
|