ceph/src/boost/boost/atomic/ipc_atomic_ref.hpp

   1 /*
   2  * Distributed under the Boost Software License, Version 1.0.
   3  * (See accompanying file LICENSE_1_0.txt or copy at
   4  * http://www.boost.org/LICENSE_1_0.txt)
   5  *
   6  * Copyright (c) 2020 Andrey Semashev
   7  */
   8 /*!
   9  * \file   atomic/ipc_atomic_ref.hpp
  10  *
  11  * This header contains definition of \c ipc_atomic_ref template.
  12  */
  13
  14 #ifndef BOOST_ATOMIC_IPC_ATOMIC_REF_HPP_INCLUDED_
  15 #define BOOST_ATOMIC_IPC_ATOMIC_REF_HPP_INCLUDED_
  16
  17 #include <boost/assert.hpp>
  18 #include <boost/static_assert.hpp>
  19 #include <boost/memory_order.hpp>
  20 #include <boost/atomic/capabilities.hpp>
  21 #include <boost/atomic/detail/config.hpp>
  22 #include <boost/atomic/detail/intptr.hpp>
  23 #include <boost/atomic/detail/classify.hpp>
  24 #include <boost/atomic/detail/atomic_ref_impl.hpp>
  25 #include <boost/atomic/detail/type_traits/is_trivially_copyable.hpp>
  26 #include <boost/atomic/detail/header.hpp>
  27
  28 #ifdef BOOST_HAS_PRAGMA_ONCE
  29 #pragma once
  30 #endif
  31
  32 namespace boost {
  33 namespace atomics {
  34
  35 //! Atomic reference to external object for inter-process communication
  36 template< typename T >
  37 class ipc_atomic_ref :
  38     public atomics::detail::base_atomic_ref< T, typename atomics::detail::classify< T >::type, true >
  39 {
  40 private:
  41     typedef atomics::detail::base_atomic_ref< T, typename atomics::detail::classify< T >::type, true > base_type;
  42     typedef typename base_type::value_arg_type value_arg_type;
  43
  44 public:
  45     typedef typename base_type::value_type value_type;
  46
  47     BOOST_STATIC_ASSERT_MSG(sizeof(value_type) > 0u, "boost::ipc_atomic_ref<T> requires T to be a complete type");
  48 #if !defined(BOOST_ATOMIC_DETAIL_NO_CXX11_IS_TRIVIALLY_COPYABLE)
  49     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");
  50 #endif
  51
  52 private:
  53     typedef typename base_type::storage_type storage_type;
  54
  55 public:
  56     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)) {})
  57     BOOST_FORCEINLINE explicit ipc_atomic_ref(value_type& v) BOOST_NOEXCEPT : base_type(v)
  58     {
  59         // Check that referenced object alignment satisfies required alignment
  60         BOOST_ASSERT((((atomics::detail::uintptr_t)this->m_value) & (base_type::required_alignment - 1u)) == 0u);
  61     }
  62
  63     BOOST_FORCEINLINE value_type operator= (value_arg_type v) const BOOST_NOEXCEPT
  64     {
  65         this->store(v);
  66         return v;
  67     }
  68
  69     BOOST_FORCEINLINE operator value_type() const BOOST_NOEXCEPT
  70     {
  71         return this->load();
  72     }
  73
  74     BOOST_DELETED_FUNCTION(ipc_atomic_ref& operator= (ipc_atomic_ref const&))
  75 };
  76
  77 } // namespace atomics
  78
  79 using atomics::ipc_atomic_ref;
  80
  81 } // namespace boost
  82
  83 #include <boost/atomic/detail/footer.hpp>
  84
  85 #endif // BOOST_ATOMIC_IPC_ATOMIC_REF_HPP_INCLUDED_