整理

include/boost/atomic/ipc_atomic_ref.hpp

@@ -0,0 +1,97 @@
+/*
+ * 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) 2020-2021 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 <type_traits>
+#include <boost/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:
+    using base_type = atomics::detail::base_atomic_ref< T, typename atomics::detail::classify< T >::type, true >;
+    using value_arg_type = typename base_type::value_arg_type;
+
+public:
+    using value_type = typename base_type::value_type;
+
+    static_assert(sizeof(value_type) > 0u, "boost::ipc_atomic_ref<T> requires T to be a complete type");
+    static_assert(atomics::detail::is_trivially_copyable< value_type >::value, "boost::ipc_atomic_ref<T> requires T to be a trivially copyable type");
+
+private:
+    using storage_type = typename base_type::storage_type;
+
+public:
+    ipc_atomic_ref(ipc_atomic_ref const&) = default;
+
+    BOOST_FORCEINLINE explicit ipc_atomic_ref(value_type& v) 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);
+    }
+
+    ipc_atomic_ref& operator= (ipc_atomic_ref const&) = delete;
+
+    BOOST_FORCEINLINE value_type operator= (value_arg_type v) const noexcept
+    {
+        this->store(v);
+        return v;
+    }
+
+    BOOST_FORCEINLINE operator value_type() const noexcept
+    {
+        return this->load();
+    }
+};
+
+#if !defined(BOOST_NO_CXX17_DEDUCTION_GUIDES)
+template< typename T >
+ipc_atomic_ref(T&) -> ipc_atomic_ref< T >;
+#endif // !defined(BOOST_NO_CXX17_DEDUCTION_GUIDES)
+
+//! IPC atomic reference factory function
+template< typename T >
+BOOST_FORCEINLINE ipc_atomic_ref< T > make_ipc_atomic_ref(T& value) noexcept
+{
+    return ipc_atomic_ref< T >(value);
+}
+
+} // namespace atomics
+
+using atomics::ipc_atomic_ref;
+using atomics::make_ipc_atomic_ref;
+
+} // namespace boost
+
+#include <boost/atomic/detail/footer.hpp>
+
+#endif // BOOST_ATOMIC_IPC_ATOMIC_REF_HPP_INCLUDED_