update ceph source to reef 18.1.2

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

diff --git a/ceph/src/boost/boost/math/ccmath/round.hpp b/ceph/src/boost/boost/math/ccmath/round.hpp
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+++ b/ceph/src/boost/boost/math/ccmath/round.hpp
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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_ROUND_HPP
+#define BOOST_MATH_CCMATH_ROUND_HPP
+
+#include <cmath>
+#include <type_traits>
+#include <stdexcept>
+#include <boost/math/tools/is_constant_evaluated.hpp>
+#include <boost/math/ccmath/abs.hpp>
+#include <boost/math/ccmath/isinf.hpp>
+#include <boost/math/ccmath/isnan.hpp>
+#include <boost/math/ccmath/modf.hpp>
+
+namespace boost::math::ccmath {
+
+namespace detail {
+
+// Computes the nearest integer value to arg (in floating-point format), 
+// rounding halfway cases away from zero, regardless of the current rounding mode.
+template <typename T>
+inline constexpr T round_impl(T arg) noexcept
+{
+    T iptr = 0;
+    const T x = boost::math::ccmath::modf(arg, &iptr);
+    constexpr T half = T(1)/2;
+
+    if(x >= half && iptr > 0)
+    {
+        return iptr + 1;
+    }
+    else if(boost::math::ccmath::abs(x) >= half && iptr < 0)
+    {
+        return iptr - 1;
+    }
+    else
+    {
+        return iptr;
+    }
+}
+
+template <typename ReturnType, typename T>
+inline constexpr ReturnType int_round_impl(T arg)
+{
+    const T rounded_arg = round_impl(arg);
+
+    if(rounded_arg > static_cast<T>((std::numeric_limits<ReturnType>::max)()))
+    {
+        if constexpr (std::is_same_v<ReturnType, long long>)
+        {
+            throw std::domain_error("Rounded value cannot be represented by a long long type without overflow");
+        }
+        else
+        {
+            throw std::domain_error("Rounded value cannot be represented by a long type without overflow");
+        }
+    }
+    else
+    {
+        return static_cast<ReturnType>(rounded_arg);
+    }
+}
+
+} // Namespace detail
+
+template <typename Real, std::enable_if_t<!std::is_integral_v<Real>, bool> = true>
+inline constexpr Real round(Real arg) noexcept
+{
+    if(BOOST_MATH_IS_CONSTANT_EVALUATED(arg))
+    {
+        return boost::math::ccmath::abs(arg) == Real(0) ? arg :
+               boost::math::ccmath::isinf(arg) ? arg :
+               boost::math::ccmath::isnan(arg) ? arg :
+               boost::math::ccmath::detail::round_impl(arg);
+    }
+    else
+    {
+        using std::round;
+        return round(arg);
+    }
+}
+
+template <typename Z, std::enable_if_t<std::is_integral_v<Z>, bool> = true>
+inline constexpr double round(Z arg) noexcept
+{
+    return boost::math::ccmath::round(static_cast<double>(arg));
+}
+
+inline constexpr float roundf(float arg) noexcept
+{
+    return boost::math::ccmath::round(arg);
+}
+
+#ifndef BOOST_MATH_NO_LONG_DOUBLE_MATH_FUNCTIONS
+inline constexpr long double roundl(long double arg) noexcept
+{
+    return boost::math::ccmath::round(arg);
+}
+#endif
+
+template <typename Real, std::enable_if_t<!std::is_integral_v<Real>, bool> = true>
+inline constexpr long lround(Real arg)
+{
+    if(BOOST_MATH_IS_CONSTANT_EVALUATED(arg))
+    {
+        return boost::math::ccmath::abs(arg) == Real(0) ? 0l :
+               boost::math::ccmath::isinf(arg) ? 0l :
+               boost::math::ccmath::isnan(arg) ? 0l :
+               boost::math::ccmath::detail::int_round_impl<long>(arg);
+    }
+    else
+    {
+        using std::lround;
+        return lround(arg);
+    }
+}
+
+template <typename Z, std::enable_if_t<std::is_integral_v<Z>, bool> = true>
+inline constexpr long lround(Z arg)
+{
+    return boost::math::ccmath::lround(static_cast<double>(arg));
+}
+
+inline constexpr long lroundf(float arg)
+{
+    return boost::math::ccmath::lround(arg);
+}
+
+#ifndef BOOST_MATH_NO_LONG_DOUBLE_MATH_FUNCTIONS
+inline constexpr long lroundl(long double arg)
+{
+    return boost::math::ccmath::lround(arg);
+}
+#endif
+
+template <typename Real, std::enable_if_t<!std::is_integral_v<Real>, bool> = true>
+inline constexpr long long llround(Real arg)
+{
+    if(BOOST_MATH_IS_CONSTANT_EVALUATED(arg))
+    {
+        return boost::math::ccmath::abs(arg) == Real(0) ? 0ll :
+               boost::math::ccmath::isinf(arg) ? 0ll :
+               boost::math::ccmath::isnan(arg) ? 0ll :
+               boost::math::ccmath::detail::int_round_impl<long long>(arg);
+    }
+    else
+    {
+        using std::llround;
+        return llround(arg);
+    }
+}
+
+template <typename Z, std::enable_if_t<std::is_integral_v<Z>, bool> = true>
+inline constexpr long llround(Z arg)
+{
+    return boost::math::ccmath::llround(static_cast<double>(arg));
+}
+
+inline constexpr long long llroundf(float arg)
+{
+    return boost::math::ccmath::llround(arg);
+}
+
+#ifndef BOOST_MATH_NO_LONG_DOUBLE_MATH_FUNCTIONS
+inline constexpr long long llroundl(long double arg)
+{
+    return boost::math::ccmath::llround(arg);
+}
+#endif
+
+} // Namespaces
+
+#endif // BOOST_MATH_CCMATH_ROUND_HPP