update ceph source to reef 18.1.2

[ceph.git] / ceph / src / boost / boost / multiprecision / traits / is_convertible_arithmetic.hpp

diff --git a/ceph/src/boost/boost/multiprecision/traits/is_convertible_arithmetic.hpp b/ceph/src/boost/boost/multiprecision/traits/is_convertible_arithmetic.hpp
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+++ b/ceph/src/boost/boost/multiprecision/traits/is_convertible_arithmetic.hpp
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+///////////////////////////////////////////////////////////////////////////////
+//  Copyright 2021 John Maddock. 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_IS_CONVERTIBLE_ARITHMETIC_HPP
+#define BOOST_IS_CONVERTIBLE_ARITHMETIC_HPP
+
+#include <type_traits>
+#include <boost/multiprecision/detail/number_base.hpp>
+#include <boost/multiprecision/detail/standalone_config.hpp>
+
+namespace boost { namespace multiprecision { namespace detail {
+
+template <class V, class Backend>
+struct is_convertible_arithmetic
+{
+   static constexpr bool value = boost::multiprecision::detail::is_arithmetic<V>::value;
+};
+//
+// For extension types, we don't *require* interoperability, 
+// so only enable it if we can convert the type to the backend
+// losslessly, ie not via conversion to a narrower type.
+// Note that backends with templated constructors/=operators
+// will not be selected here, so these need to either specialize
+// this trait, or provide a proper non-template constructor/=operator
+// for the extension types it supports.
+//
+#ifdef BOOST_HAS_FLOAT128
+template <class Backend>
+struct is_convertible_arithmetic<float128_type, Backend>
+{
+   static constexpr bool value = std::is_assignable<Backend, convertible_to<float128_type>>::value;
+};
+#endif
+#ifdef BOOST_HAS_INT128
+template <class Backend>
+struct is_convertible_arithmetic<int128_type, Backend>
+{
+   static constexpr bool value = std::is_assignable<Backend, convertible_to<int128_type>>::value;
+};
+template <class Backend>
+struct is_convertible_arithmetic<uint128_type, Backend>
+{
+   static constexpr bool value = std::is_assignable<Backend, convertible_to<uint128_type>>::value;
+};
+#endif
+
+}}} // namespace boost::multiprecision::detail
+
+#endif // BOOST_IS_BYTE_CONTAINER_HPP