update ceph source to reef 18.1.2

[ceph.git] / ceph / src / boost / boost / math / ccmath / fmax.hpp

diff --git a/ceph/src/boost/boost/math/ccmath/fmax.hpp b/ceph/src/boost/boost/math/ccmath/fmax.hpp
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+++ b/ceph/src/boost/boost/math/ccmath/fmax.hpp
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+//  (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_FMAX_HPP
+#define BOOST_MATH_CCMATH_FMAX_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 fmax_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 fmax(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::fmax_impl(x, y);
+    }
+    else
+    {
+        using std::fmax;
+        return fmax(x, y);
+    }
+}
+
+template <typename T1, typename T2>
+inline constexpr auto fmax(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::fmax(promoted_type(x), promoted_type(y));
+    }
+    else
+    {
+        using std::fmax;
+        return fmax(x, y);
+    }
+}
+
+inline constexpr float fmaxf(float x, float y) noexcept
+{
+    return boost::math::ccmath::fmax(x, y);
+}
+
+#ifndef BOOST_MATH_NO_LONG_DOUBLE_MATH_FUNCTIONS
+inline constexpr long double fmaxl(long double x, long double y) noexcept
+{
+    return boost::math::ccmath::fmax(x, y);
+}
+#endif
+
+} // Namespace boost::math::ccmath
+
+#endif // BOOST_MATH_CCMATH_FMAX_HPP