Add atomic_shared_ptr

2026-05-04 20:04:21 +02:00 · 2017-06-16 18:26:17 +03:00
parent bcc9e50a54
commit a7668291d2
3 changed files with 470 additions and 1 deletions
@@ -0,0 +1,142 @@
+#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>
+
+namespace boost
+{
+
+template<class T> class atomic_shared_ptr
+{
+private:
+
+    boost::shared_ptr<T> p_;
+
+    atomic_shared_ptr(const atomic_shared_ptr&);
+    atomic_shared_ptr& operator=(const atomic_shared_ptr&);
+
+public:
+
+    atomic_shared_ptr() BOOST_SP_NOEXCEPT
+    {
+    }
+
+    BOOST_CONSTEXPR atomic_shared_ptr( shared_ptr<T> p ) BOOST_SP_NOEXCEPT: p_( p )
+    {
+    }
+
+    atomic_shared_ptr& operator=( shared_ptr<T> r ) BOOST_SP_NOEXCEPT
+    {
+#if !defined( BOOST_NO_CXX11_RVALUE_REFERENCES )
+
+        atomic_store( &p_, std::move( r ) );
+
+#else
+
+        atomic_store( &p_, r );
+
+#endif
+        return *this;
+    }
+
+    BOOST_CONSTEXPR bool is_lock_free() const BOOST_SP_NOEXCEPT
+    {
+        return false;
+    }
+
+    shared_ptr<T> load( int = 0 ) const BOOST_SP_NOEXCEPT
+    {
+        return atomic_load( &p_ );
+    }
+
+    operator shared_ptr<T>() const BOOST_SP_NOEXCEPT
+    {
+        return atomic_load( &p_ );
+    }
+
+    void store( shared_ptr<T> r, int = 0 ) BOOST_SP_NOEXCEPT
+    {
+#if !defined( BOOST_NO_CXX11_RVALUE_REFERENCES )
+
+        atomic_store( &p_, std::move( r ) );
+
+#else
+
+        atomic_store( &p_, r );
+
+#endif
+    }
+
+    shared_ptr<T> exchange( shared_ptr<T> r, int = 0 ) BOOST_SP_NOEXCEPT
+    {
+#if !defined( BOOST_NO_CXX11_RVALUE_REFERENCES )
+
+        return atomic_exchange( &p_, std::move( r ) );
+
+#else
+
+        return atomic_exchange( &p_, r );
+
+#endif
+    }
+
+    bool compare_exchange_weak( shared_ptr<T>& v, const shared_ptr<T>& w, int, int ) BOOST_SP_NOEXCEPT
+    {
+        return atomic_compare_exchange( &p_, &v, w );
+    }
+
+    bool compare_exchange_weak( shared_ptr<T>& v, const shared_ptr<T>& w, int = 0 ) BOOST_SP_NOEXCEPT
+    {
+        return atomic_compare_exchange( &p_, &v, w );
+    }
+
+    bool compare_exchange_strong( shared_ptr<T>& v, const shared_ptr<T>& w, int, int ) BOOST_SP_NOEXCEPT
+    {
+        return atomic_compare_exchange( &p_, &v, w );
+    }
+
+    bool compare_exchange_strong( shared_ptr<T>& v, const shared_ptr<T>& w, int = 0 ) BOOST_SP_NOEXCEPT
+    {
+        return atomic_compare_exchange( &p_, &v, w );
+    }
+
+#if !defined( BOOST_NO_CXX11_RVALUE_REFERENCES )
+
+    bool compare_exchange_weak( shared_ptr<T>& v, shared_ptr<T>&& w, int,  int ) BOOST_SP_NOEXCEPT
+    {
+        return atomic_compare_exchange( &p_, &v, std::move( w ) );
+    }
+
+    bool compare_exchange_weak( shared_ptr<T>& v, shared_ptr<T>&& w, int = 0 ) BOOST_SP_NOEXCEPT
+    {
+        return atomic_compare_exchange( &p_, &v, std::move( w ) );
+    }
+
+    bool compare_exchange_strong( shared_ptr<T>& v, shared_ptr<T>&& w, int, int ) BOOST_SP_NOEXCEPT
+    {
+        return atomic_compare_exchange( &p_, &v, std::move( w ) );
+    }
+
+    bool compare_exchange_strong( shared_ptr<T>& v, shared_ptr<T>&& w, int = 0 ) BOOST_SP_NOEXCEPT
+    {
+        return atomic_compare_exchange( &p_, &v, std::move( w ) );
+    }
+
+#endif
+};
+
+} // namespace boost
+
+#endif  // #ifndef BOOST_SMART_PTR_ATOMIC_SHARED_PTR_HPP_INCLUDED