update boost

linx64/include/boost/math/ccmath/scalbln.hpp

@@ -0,0 +1,57 @@
+//  (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_SCALBLN_HPP
+#define BOOST_MATH_CCMATH_SCALBLN_HPP
+
+#include <cmath>
+#include <cfloat>
+#include <type_traits>
+#include <boost/math/tools/is_constant_evaluated.hpp>
+#include <boost/math/ccmath/scalbn.hpp>
+#include <boost/math/ccmath/abs.hpp>
+#include <boost/math/ccmath/isinf.hpp>
+#include <boost/math/ccmath/isnan.hpp>
+
+namespace boost::math::ccmath {
+
+template <typename Real, std::enable_if_t<!std::is_integral_v<Real>, bool> = true>
+inline constexpr Real scalbln(Real arg, long exp) 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::scalbn_impl(arg, exp);
+    }
+    else
+    {
+        using std::scalbln;
+        return scalbln(arg, exp);
+    }
+}
+
+template <typename Z, std::enable_if_t<std::is_integral_v<Z>, bool> = true>
+inline constexpr double scalbln(Z arg, long exp) noexcept
+{
+    return boost::math::ccmath::scalbln(static_cast<double>(arg), exp);
+}
+
+inline constexpr float scalblnf(float arg, long exp) noexcept
+{
+    return boost::math::ccmath::scalbln(arg, exp);
+}
+
+#ifndef BOOST_MATH_NO_LONG_DOUBLE_MATH_FUNCTIONS
+inline constexpr long double scalblnl(long double arg, long exp) noexcept
+{
+    return boost::math::ccmath::scalbln(arg, exp);
+}
+#endif
+
+} // Namespaces
+
+#endif // BOOST_MATH_CCMATH_SCALBLN_HPP