ceph/src/boost/boost/atomic/ipc_atomic.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.hpp
  10  *
  11  * This header contains definition of \c ipc_atomic template.
  12  */
  13
  14 #ifndef BOOST_ATOMIC_IPC_ATOMIC_HPP_INCLUDED_
  15 #define BOOST_ATOMIC_IPC_ATOMIC_HPP_INCLUDED_
  16
  17 #include <cstddef>
  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/classify.hpp>
  23 #include <boost/atomic/detail/atomic_impl.hpp>
  24 #include <boost/atomic/detail/type_traits/is_trivially_copyable.hpp>
  25 #include <boost/atomic/detail/type_traits/is_nothrow_default_constructible.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 object for inter-process communication
  36 template< typename T >
  37 class ipc_atomic :
  38     public atomics::detail::base_atomic< T, typename atomics::detail::classify< T >::type, true >
  39 {
  40 private:
  41     typedef atomics::detail::base_atomic< 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<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<T> requires T to be a trivially copyable type");
  50 #endif
  51
  52 public:
  53     BOOST_FORCEINLINE BOOST_ATOMIC_DETAIL_CONSTEXPR_UNION_INIT ipc_atomic() BOOST_NOEXCEPT_IF(atomics::detail::is_nothrow_default_constructible< value_type >::value) : base_type()
  54     {
  55     }
  56
  57     BOOST_FORCEINLINE BOOST_ATOMIC_DETAIL_CONSTEXPR_UNION_INIT ipc_atomic(value_arg_type v) BOOST_NOEXCEPT : base_type(v)
  58     {
  59     }
  60
  61     BOOST_FORCEINLINE value_type operator= (value_arg_type v) BOOST_NOEXCEPT
  62     {
  63         this->store(v);
  64         return v;
  65     }
  66
  67     BOOST_FORCEINLINE value_type operator= (value_arg_type v) volatile BOOST_NOEXCEPT
  68     {
  69         this->store(v);
  70         return v;
  71     }
  72
  73     BOOST_FORCEINLINE operator value_type() const volatile BOOST_NOEXCEPT
  74     {
  75         return this->load();
  76     }
  77
  78     BOOST_DELETED_FUNCTION(ipc_atomic(ipc_atomic const&))
  79     BOOST_DELETED_FUNCTION(ipc_atomic& operator= (ipc_atomic const&))
  80     BOOST_DELETED_FUNCTION(ipc_atomic& operator= (ipc_atomic const&) volatile)
  81 };
  82
  83 } // namespace atomics
  84
  85 using atomics::ipc_atomic;
  86
  87 } // namespace boost
  88
  89 #include <boost/atomic/detail/footer.hpp>
  90
  91 #endif // BOOST_ATOMIC_IPC_ATOMIC_HPP_INCLUDED_