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+/*
+ * 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)
+ *
+ * Copyright (c) 2017 Andrey Semashev
+ */
+/*!
+ * \file atomic/detail/type_traits/is_signed.hpp
+ *
+ * This header defines \c is_signed type trait
+ */
+
+#ifndef BOOST_ATOMIC_DETAIL_TYPE_TRAITS_IS_SIGNED_HPP_INCLUDED_
+#define BOOST_ATOMIC_DETAIL_TYPE_TRAITS_IS_SIGNED_HPP_INCLUDED_
+
+#include <boost/atomic/detail/config.hpp>
+// Some versions of libstdc++ don't consider __int128 an integral type. Use Boost.TypeTraits because of that.
+#if !defined(BOOST_ATOMIC_DETAIL_NO_CXX11_HDR_TYPE_TRAITS) && !defined(BOOST_HAS_INT128)
+#include <type_traits>
+#else
+#include <boost/type_traits/is_signed.hpp>
+#endif
+
+#ifdef BOOST_HAS_PRAGMA_ONCE
+#pragma once
+#endif
+
+namespace boost {
+namespace atomics {
+namespace detail {
+
+#if !defined(BOOST_ATOMIC_DETAIL_NO_CXX11_HDR_TYPE_TRAITS) && !defined(BOOST_HAS_INT128)
+using std::is_signed;
+#else
+using boost::is_signed;
+#endif
+
+} // namespace detail
+} // namespace atomics
+} // namespace boost
+
+#endif // BOOST_ATOMIC_DETAIL_TYPE_TRAITS_IS_SIGNED_HPP_INCLUDED_