Added thirdparty: boost library

thirdparty/include/boost/math/ccmath/ldexp.hpp

@@ -0,0 +1,81 @@
+//  (C) Copyright Matt Borland 2021.
+//  (C) Copyright John Maddock 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_LDEXP_HPP
+#define BOOST_MATH_CCMATH_LDEXP_HPP
+
+#include <boost/math/ccmath/detail/config.hpp>
+
+#ifdef BOOST_MATH_NO_CCMATH
+#error "The header <boost/math/ldexp.hpp> can only be used in C++17 and later."
+#endif
+
+#include <stdexcept>
+#include <boost/math/ccmath/abs.hpp>
+#include <boost/math/ccmath/isinf.hpp>
+#include <boost/math/ccmath/isnan.hpp>
+
+namespace boost::math::ccmath {
+
+namespace detail {
+
+template <typename Real>
+inline constexpr Real ldexp_impl(Real arg, int exp) noexcept
+{
+    while(exp > 0)
+    {
+        arg *= 2;
+        --exp;
+    }
+    while(exp < 0)
+    {
+        arg /= 2;
+        ++exp;
+    }
+
+    return arg;
+}
+
+} // Namespace detail
+
+template <typename Real, std::enable_if_t<!std::is_integral_v<Real>, bool> = true>
+inline constexpr Real ldexp(Real arg, int 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::ldexp_impl(arg, exp);
+    }
+    else
+    {
+        using std::ldexp;
+        return ldexp(arg, exp);
+    }
+}
+
+template <typename Z, std::enable_if_t<std::is_integral_v<Z>, bool> = true>
+inline constexpr double ldexp(Z arg, int exp) noexcept
+{
+    return boost::math::ccmath::ldexp(static_cast<double>(arg), exp);
+}
+
+inline constexpr float ldexpf(float arg, int exp) noexcept
+{
+    return boost::math::ccmath::ldexp(arg, exp);
+}
+
+#ifndef BOOST_MATH_NO_LONG_DOUBLE_MATH_FUNCTIONS
+inline constexpr long double ldexpl(long double arg, int exp) noexcept
+{
+    return boost::math::ccmath::ldexp(arg, exp);
+}
+#endif
+
+} // Namespaces
+
+#endif // BOOST_MATH_CCMATH_LDEXP_HPP