整理

include/boost/smart_ptr/atomic_shared_ptr.hpp

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+#ifndef BOOST_SMART_PTR_ATOMIC_SHARED_PTR_HPP_INCLUDED
+#define BOOST_SMART_PTR_ATOMIC_SHARED_PTR_HPP_INCLUDED
+
+//
+//  atomic_shared_ptr.hpp
+//
+//  Copyright 2017 Peter Dimov
+//
+//  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)
+//
+//  See http://www.boost.org/libs/smart_ptr/ for documentation.
+//
+
+#include <boost/smart_ptr/shared_ptr.hpp>
+#include <boost/smart_ptr/detail/spinlock.hpp>
+#include <cstring>
+
+namespace boost
+{
+
+template<class T> class atomic_shared_ptr
+{
+private:
+
+    boost::shared_ptr<T> p_;
+
+    mutable boost::detail::spinlock l_;
+
+    atomic_shared_ptr(const atomic_shared_ptr&);
+    atomic_shared_ptr& operator=(const atomic_shared_ptr&);
+
+private:
+
+    bool compare_exchange( shared_ptr<T>& v, shared_ptr<T> w ) noexcept
+    {
+        l_.lock();
+
+        if( p_._internal_equiv( v ) )
+        {
+            p_.swap( w );
+
+            l_.unlock();
+            return true;
+        }
+        else
+        {
+            shared_ptr<T> tmp( p_ );
+
+            l_.unlock();
+
+            tmp.swap( v );
+            return false;
+        }
+    }
+
+public:
+
+    constexpr atomic_shared_ptr() noexcept: l_ BOOST_DETAIL_SPINLOCK_INIT
+    {
+    }
+
+    atomic_shared_ptr( shared_ptr<T> p ) noexcept
+        : p_( std::move( p ) ), l_ BOOST_DETAIL_SPINLOCK_INIT
+    {
+    }
+
+    atomic_shared_ptr& operator=( shared_ptr<T> r ) noexcept
+    {
+        boost::detail::spinlock::scoped_lock lock( l_ );
+        p_.swap( r );
+
+        return *this;
+    }
+
+    constexpr bool is_lock_free() const noexcept
+    {
+        return false;
+    }
+
+    shared_ptr<T> load() const noexcept
+    {
+        boost::detail::spinlock::scoped_lock lock( l_ );
+        return p_;
+    }
+
+    template<class M> shared_ptr<T> load( M ) const noexcept
+    {
+        boost::detail::spinlock::scoped_lock lock( l_ );
+        return p_;
+    }
+
+    operator shared_ptr<T>() const noexcept
+    {
+        boost::detail::spinlock::scoped_lock lock( l_ );
+        return p_;
+    }
+
+    void store( shared_ptr<T> r ) noexcept
+    {
+        boost::detail::spinlock::scoped_lock lock( l_ );
+        p_.swap( r );
+    }
+
+    template<class M> void store( shared_ptr<T> r, M ) noexcept
+    {
+        boost::detail::spinlock::scoped_lock lock( l_ );
+        p_.swap( r );
+    }
+
+    shared_ptr<T> exchange( shared_ptr<T> r ) noexcept
+    {
+        {
+            boost::detail::spinlock::scoped_lock lock( l_ );
+            p_.swap( r );
+        }
+
+        return std::move( r );
+    }
+
+    template<class M> shared_ptr<T> exchange( shared_ptr<T> r, M ) noexcept
+    {
+        {
+            boost::detail::spinlock::scoped_lock lock( l_ );
+            p_.swap( r );
+        }
+
+        return std::move( r );
+    }
+
+    template<class M> bool compare_exchange_weak( shared_ptr<T>& v, const shared_ptr<T>& w, M, M ) noexcept
+    {
+        return compare_exchange( v, w );
+    }
+
+    template<class M> bool compare_exchange_weak( shared_ptr<T>& v, const shared_ptr<T>& w, M ) noexcept
+    {
+        return compare_exchange( v, w );
+    }
+
+    bool compare_exchange_weak( shared_ptr<T>& v, const shared_ptr<T>& w ) noexcept
+    {
+        return compare_exchange( v, w );
+    }
+
+    template<class M> bool compare_exchange_strong( shared_ptr<T>& v, const shared_ptr<T>& w, M, M ) noexcept
+    {
+        return compare_exchange( v, w );
+    }
+
+    template<class M> bool compare_exchange_strong( shared_ptr<T>& v, const shared_ptr<T>& w, M ) noexcept
+    {
+        return compare_exchange( v, w );
+    }
+
+    bool compare_exchange_strong( shared_ptr<T>& v, const shared_ptr<T>& w ) noexcept
+    {
+        return compare_exchange( v, w );
+    }
+
+    template<class M> bool compare_exchange_weak( shared_ptr<T>& v, shared_ptr<T>&& w, M, M ) noexcept
+    {
+        return compare_exchange( v, std::move( w ) );
+    }
+
+    template<class M> bool compare_exchange_weak( shared_ptr<T>& v, shared_ptr<T>&& w, M ) noexcept
+    {
+        return compare_exchange( v, std::move( w ) );
+    }
+
+    bool compare_exchange_weak( shared_ptr<T>& v, shared_ptr<T>&& w ) noexcept
+    {
+        return compare_exchange( v, std::move( w ) );
+    }
+
+    template<class M> bool compare_exchange_strong( shared_ptr<T>& v, shared_ptr<T>&& w, M, M ) noexcept
+    {
+        return compare_exchange( v, std::move( w ) );
+    }
+
+    template<class M> bool compare_exchange_strong( shared_ptr<T>& v, shared_ptr<T>&& w, M ) noexcept
+    {
+        return compare_exchange( v, std::move( w ) );
+    }
+
+    bool compare_exchange_strong( shared_ptr<T>& v, shared_ptr<T>&& w ) noexcept
+    {
+        return compare_exchange( v, std::move( w ) );
+    }
+};
+
+} // namespace boost
+
+#endif  // #ifndef BOOST_SMART_PTR_ATOMIC_SHARED_PTR_HPP_INCLUDED