Added thirdparty: boost library

thirdparty/include/boost/multiprecision/detail/functions/trunc.hpp

@@ -0,0 +1,78 @@
+///////////////////////////////////////////////////////////////////////////////
+//  Copyright 2022 Matt Borland. Distributed under 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_MP_DETAIL_FUNCTIONS_TRUNC_HPP
+#define BOOST_MP_DETAIL_FUNCTIONS_TRUNC_HPP
+
+#include <cmath>
+#include <limits>
+#include <stdexcept>
+#include <boost/multiprecision/detail/standalone_config.hpp>
+#include <boost/multiprecision/detail/no_exceptions_support.hpp>
+
+#ifdef BOOST_MP_MATH_AVAILABLE
+#include <boost/math/special_functions/trunc.hpp>
+#endif
+
+namespace boost { namespace multiprecision { namespace detail {
+
+namespace impl {
+
+template <typename T>
+inline T trunc BOOST_PREVENT_MACRO_SUBSTITUTION (const T arg)
+{
+    using std::floor;
+    using std::ceil;
+
+    return (arg > 0) ? floor(arg) : ceil(arg);
+}
+
+} // namespace impl
+
+#ifdef BOOST_MP_MATH_AVAILABLE
+
+template <typename T>
+inline long long lltrunc BOOST_PREVENT_MACRO_SUBSTITUTION (const T arg)
+{
+    return boost::math::lltrunc(arg);
+}
+
+template <typename T>
+inline int itrunc BOOST_PREVENT_MACRO_SUBSTITUTION (const T arg)
+{
+    return boost::math::itrunc(arg);
+}
+
+#else
+
+template <typename T>
+inline long long lltrunc BOOST_PREVENT_MACRO_SUBSTITUTION (const T arg)
+{
+    T t = boost::multiprecision::detail::impl::trunc(arg);
+    if (t > LLONG_MAX)
+    {
+        BOOST_MP_THROW_EXCEPTION(std::domain_error("arg cannot be converted into a long long"));
+    }
+
+    return static_cast<long long>(t);
+}
+
+template <typename T>
+inline int itrunc BOOST_PREVENT_MACRO_SUBSTITUTION (const T arg)
+{
+    T t = boost::multiprecision::detail::impl::trunc(arg);
+    if (t > static_cast<T>(INT_MAX))
+    {
+        BOOST_MP_THROW_EXCEPTION(std::domain_error("arg cannot be converted into an int"));
+    }
+
+    return static_cast<int>(t);
+}
+
+#endif
+
+}}} // Namespaces
+
+#endif // BOOST_MP_DETAIL_FUNCTIONS_TRUNC_HPP