99 lines
3.0 KiB
C++
99 lines
3.0 KiB
C++
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/*
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* Distributed under the Boost Software License, Version 1.0.
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* (See accompanying file LICENSE_1_0.txt or copy at
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* http://www.boost.org/LICENSE_1_0.txt)
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*
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* Copyright (c) 2020-2021 Andrey Semashev
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*/
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/*!
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* \file atomic/atomic_ref.hpp
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*
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* This header contains definition of \c atomic_ref template.
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*/
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#ifndef BOOST_ATOMIC_ATOMIC_REF_HPP_INCLUDED_
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#define BOOST_ATOMIC_ATOMIC_REF_HPP_INCLUDED_
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#include <boost/assert.hpp>
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#include <boost/static_assert.hpp>
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#include <boost/memory_order.hpp>
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#include <boost/atomic/capabilities.hpp>
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#include <boost/atomic/detail/config.hpp>
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#include <boost/atomic/detail/intptr.hpp>
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#include <boost/atomic/detail/classify.hpp>
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#include <boost/atomic/detail/atomic_ref_impl.hpp>
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#include <boost/atomic/detail/type_traits/is_trivially_copyable.hpp>
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#include <boost/atomic/detail/header.hpp>
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#ifdef BOOST_HAS_PRAGMA_ONCE
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#pragma once
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#endif
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namespace boost {
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namespace atomics {
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//! Atomic reference to external object
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template< typename T >
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class atomic_ref :
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public atomics::detail::base_atomic_ref< T, typename atomics::detail::classify< T >::type, false >
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{
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private:
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typedef atomics::detail::base_atomic_ref< T, typename atomics::detail::classify< T >::type, false > base_type;
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typedef typename base_type::value_arg_type value_arg_type;
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public:
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typedef typename base_type::value_type value_type;
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BOOST_STATIC_ASSERT_MSG(sizeof(value_type) > 0u, "boost::atomic_ref<T> requires T to be a complete type");
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#if !defined(BOOST_ATOMIC_DETAIL_NO_CXX11_IS_TRIVIALLY_COPYABLE)
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BOOST_STATIC_ASSERT_MSG(atomics::detail::is_trivially_copyable< value_type >::value, "boost::atomic_ref<T> requires T to be a trivially copyable type");
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#endif
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private:
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typedef typename base_type::storage_type storage_type;
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public:
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BOOST_DEFAULTED_FUNCTION(atomic_ref(atomic_ref const& that) BOOST_ATOMIC_DETAIL_DEF_NOEXCEPT_DECL, BOOST_ATOMIC_DETAIL_DEF_NOEXCEPT_IMPL : base_type(static_cast< base_type const& >(that)) {})
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BOOST_FORCEINLINE explicit atomic_ref(value_type& v) BOOST_NOEXCEPT : base_type(v)
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{
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// Check that referenced object alignment satisfies required alignment
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BOOST_ASSERT((((atomics::detail::uintptr_t)this->m_value) & (base_type::required_alignment - 1u)) == 0u);
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}
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BOOST_FORCEINLINE value_type operator= (value_arg_type v) const BOOST_NOEXCEPT
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{
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this->store(v);
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return v;
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}
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BOOST_FORCEINLINE operator value_type() const BOOST_NOEXCEPT
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{
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return this->load();
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}
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BOOST_DELETED_FUNCTION(atomic_ref& operator= (atomic_ref const&))
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};
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#if !defined(BOOST_NO_CXX17_DEDUCTION_GUIDES)
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template< typename T >
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atomic_ref(T&) -> atomic_ref< T >;
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#endif // !defined(BOOST_NO_CXX17_DEDUCTION_GUIDES)
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//! Atomic reference factory function
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template< typename T >
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BOOST_FORCEINLINE atomic_ref< T > make_atomic_ref(T& value) BOOST_NOEXCEPT
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{
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return atomic_ref< T >(value);
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}
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} // namespace atomics
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using atomics::atomic_ref;
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using atomics::make_atomic_ref;
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} // namespace boost
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#include <boost/atomic/detail/footer.hpp>
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#endif // BOOST_ATOMIC_ATOMIC_REF_HPP_INCLUDED_
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