import quincy beta 17.1.0

[ceph.git] / ceph / src / boost / boost / atomic / ipc_atomic_ref.hpp

diff --git a/ceph/src/boost/boost/atomic/ipc_atomic_ref.hpp b/ceph/src/boost/boost/atomic/ipc_atomic_ref.hpp
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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) 2020 Andrey Semashev
+ */
+/*!
+ * \file   atomic/ipc_atomic_ref.hpp
+ *
+ * This header contains definition of \c ipc_atomic_ref template.
+ */
+
+#ifndef BOOST_ATOMIC_IPC_ATOMIC_REF_HPP_INCLUDED_
+#define BOOST_ATOMIC_IPC_ATOMIC_REF_HPP_INCLUDED_
+
+#include <boost/assert.hpp>
+#include <boost/static_assert.hpp>
+#include <boost/memory_order.hpp>
+#include <boost/atomic/capabilities.hpp>
+#include <boost/atomic/detail/config.hpp>
+#include <boost/atomic/detail/intptr.hpp>
+#include <boost/atomic/detail/classify.hpp>
+#include <boost/atomic/detail/atomic_ref_impl.hpp>
+#include <boost/atomic/detail/type_traits/is_trivially_copyable.hpp>
+#include <boost/atomic/detail/header.hpp>
+
+#ifdef BOOST_HAS_PRAGMA_ONCE
+#pragma once
+#endif
+
+namespace boost {
+namespace atomics {
+
+//! Atomic reference to external object for inter-process communication
+template< typename T >
+class ipc_atomic_ref :
+    public atomics::detail::base_atomic_ref< T, typename atomics::detail::classify< T >::type, true >
+{
+private:
+    typedef atomics::detail::base_atomic_ref< T, typename atomics::detail::classify< T >::type, true > base_type;
+    typedef typename base_type::value_arg_type value_arg_type;
+
+public:
+    typedef typename base_type::value_type value_type;
+
+    BOOST_STATIC_ASSERT_MSG(sizeof(value_type) > 0u, "boost::ipc_atomic_ref<T> requires T to be a complete type");
+#if !defined(BOOST_ATOMIC_DETAIL_NO_CXX11_IS_TRIVIALLY_COPYABLE)
+    BOOST_STATIC_ASSERT_MSG(atomics::detail::is_trivially_copyable< value_type >::value, "boost::ipc_atomic_ref<T> requires T to be a trivially copyable type");
+#endif
+
+private:
+    typedef typename base_type::storage_type storage_type;
+
+public:
+    BOOST_DEFAULTED_FUNCTION(ipc_atomic_ref(ipc_atomic_ref const& that) BOOST_ATOMIC_DETAIL_DEF_NOEXCEPT_DECL, BOOST_ATOMIC_DETAIL_DEF_NOEXCEPT_IMPL : base_type(static_cast< base_type const& >(that)) {})
+    BOOST_FORCEINLINE explicit ipc_atomic_ref(value_type& v) BOOST_NOEXCEPT : base_type(v)
+    {
+        // Check that referenced object alignment satisfies required alignment
+        BOOST_ASSERT((((atomics::detail::uintptr_t)this->m_value) & (base_type::required_alignment - 1u)) == 0u);
+    }
+
+    BOOST_FORCEINLINE value_type operator= (value_arg_type v) const BOOST_NOEXCEPT
+    {
+        this->store(v);
+        return v;
+    }
+
+    BOOST_FORCEINLINE operator value_type() const BOOST_NOEXCEPT
+    {
+        return this->load();
+    }
+
+    BOOST_DELETED_FUNCTION(ipc_atomic_ref& operator= (ipc_atomic_ref const&))
+};
+
+} // namespace atomics
+
+using atomics::ipc_atomic_ref;
+
+} // namespace boost
+
+#include <boost/atomic/detail/footer.hpp>
+
+#endif // BOOST_ATOMIC_IPC_ATOMIC_REF_HPP_INCLUDED_