Added thirdparty: boost library

2026-08-07 16:07:53 +00:00 · 2024-01-06 19:55:56 +02:00
parent bf49f439e1
commit bccd1e7051
15683 changed files with 3239840 additions and 0 deletions
@@ -0,0 +1,101 @@
+//  (C) Copyright Christopher Kormanyos 1999 - 2021.
+//  (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_FREXP_HPP
+#define BOOST_MATH_CCMATH_FREXP_HPP
+
+#include <boost/math/ccmath/detail/config.hpp>
+
+#ifdef BOOST_MATH_NO_CCMATH
+#error "The header <boost/math/frexp.hpp> can only be used in C++17 and later."
+#endif
+
+#include <boost/math/ccmath/isinf.hpp>
+#include <boost/math/ccmath/isnan.hpp>
+#include <boost/math/ccmath/isfinite.hpp>
+
+namespace boost::math::ccmath {
+
+namespace detail
+{
+
+template <typename Real>
+inline constexpr Real frexp_zero_impl(Real arg, int* exp)
+{
+    *exp = 0;
+    return arg;
+}
+
+template <typename Real>
+inline constexpr Real frexp_impl(Real arg, int* exp)
+{
+    const bool negative_arg = (arg < Real(0));
+    
+    Real f = negative_arg ? -arg : arg;
+    int e2 = 0;
+    constexpr Real two_pow_32 = Real(4294967296);
+
+    while (f >= two_pow_32)
+    {
+        f = f / two_pow_32;
+        e2 += 32;
+    }
+
+    while(f >= Real(1))
+    {
+        f = f / Real(2);
+        ++e2;
+    }
+    
+    if(exp != nullptr)
+    {
+        *exp = e2;
+    }
+
+    return !negative_arg ? f : -f;
+}
+
+} // namespace detail
+
+template <typename Real, std::enable_if_t<!std::is_integral_v<Real>, bool> = true>
+inline constexpr Real frexp(Real arg, int* exp)
+{
+    if(BOOST_MATH_IS_CONSTANT_EVALUATED(arg))
+    {
+        return arg == Real(0)  ? detail::frexp_zero_impl(arg, exp) : 
+               arg == Real(-0) ? detail::frexp_zero_impl(arg, exp) :
+               boost::math::ccmath::isinf(arg) ? detail::frexp_zero_impl(arg, exp) : 
+               boost::math::ccmath::isnan(arg) ? detail::frexp_zero_impl(arg, exp) :
+               boost::math::ccmath::detail::frexp_impl(arg, exp);
+    }
+    else
+    {
+        using std::frexp;
+        return frexp(arg, exp);
+    }
+}
+
+template <typename Z, std::enable_if_t<std::is_integral_v<Z>, bool> = true>
+inline constexpr double frexp(Z arg, int* exp)
+{
+    return boost::math::ccmath::frexp(static_cast<double>(arg), exp);
+}
+
+inline constexpr float frexpf(float arg, int* exp)
+{
+    return boost::math::ccmath::frexp(arg, exp);
+}
+
+#ifndef BOOST_MATH_NO_LONG_DOUBLE_MATH_FUNCTIONS
+inline constexpr long double frexpl(long double arg, int* exp)
+{
+    return boost::math::ccmath::frexp(arg, exp);
+}
+#endif
+
+}
+
+#endif // BOOST_MATH_CCMATH_FREXP_HPP