整理

include/boost/smart_ptr/detail/atomic_count.hpp

@@ -0,0 +1,62 @@
+#ifndef BOOST_SMART_PTR_DETAIL_ATOMIC_COUNT_HPP_INCLUDED
+#define BOOST_SMART_PTR_DETAIL_ATOMIC_COUNT_HPP_INCLUDED
+
+// MS compatible compilers support #pragma once
+
+#if defined(_MSC_VER) && (_MSC_VER >= 1020)
+# pragma once
+#endif
+
+//
+//  boost/detail/atomic_count.hpp - thread/SMP safe reference counter
+//
+//  Copyright (c) 2001, 2002 Peter Dimov and Multi Media Ltd.
+//  Copyright (c) 2013 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
+//
+//  typedef <implementation-defined> boost::detail::atomic_count;
+//
+//  atomic_count a(n);
+//
+//    (n is convertible to long)
+//
+//    Effects: Constructs an atomic_count with an initial value of n
+//
+//  a;
+//
+//    Returns: (long) the current value of a
+//    Memory Ordering: acquire
+//
+//  ++a;
+//
+//    Effects: Atomically increments the value of a
+//    Returns: (long) the new value of a
+//    Memory Ordering: acquire/release
+//
+//  --a;
+//
+//    Effects: Atomically decrements the value of a
+//    Returns: (long) the new value of a
+//    Memory Ordering: acquire/release
+//
+
+#include <boost/smart_ptr/detail/deprecated_macros.hpp>
+
+#if defined( BOOST_AC_DISABLE_THREADS )
+# include <boost/smart_ptr/detail/atomic_count_nt.hpp>
+
+#elif defined( BOOST_AC_USE_STD_ATOMIC )
+# include <boost/smart_ptr/detail/atomic_count_std_atomic.hpp>
+
+#elif defined( BOOST_SP_DISABLE_THREADS )
+# include <boost/smart_ptr/detail/atomic_count_nt.hpp>
+
+#else
+# include <boost/smart_ptr/detail/atomic_count_std_atomic.hpp>
+
+#endif
+
+#endif // #ifndef BOOST_SMART_PTR_DETAIL_ATOMIC_COUNT_HPP_INCLUDED

include/boost/smart_ptr/detail/atomic_count_nt.hpp

@@ -0,0 +1,66 @@
+#ifndef BOOST_SMART_PTR_DETAIL_ATOMIC_COUNT_NT_HPP_INCLUDED
+#define BOOST_SMART_PTR_DETAIL_ATOMIC_COUNT_NT_HPP_INCLUDED
+
+//
+//  boost/detail/atomic_count_nt.hpp
+//
+//  Trivial atomic_count for the single-threaded case
+//
+//  http://gcc.gnu.org/onlinedocs/porting/Thread-safety.html
+//
+//  Copyright 2013 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
+//
+
+#if defined(BOOST_SP_REPORT_IMPLEMENTATION)
+
+#include <boost/config/pragma_message.hpp>
+BOOST_PRAGMA_MESSAGE("Using single-threaded, non-atomic atomic_count")
+
+#endif
+
+namespace boost
+{
+
+namespace detail
+{
+
+class atomic_count
+{
+public:
+
+    explicit atomic_count( long v ): value_( v )
+    {
+    }
+
+    long operator++()
+    {
+        return ++value_;
+    }
+
+    long operator--()
+    {
+        return --value_;
+    }
+
+    operator long() const
+    {
+        return value_;
+    }
+
+private:
+
+    atomic_count(atomic_count const &);
+    atomic_count & operator=(atomic_count const &);
+
+    long value_;
+};
+
+} // namespace detail
+
+} // namespace boost
+
+#endif // #ifndef BOOST_SMART_PTR_DETAIL_ATOMIC_COUNT_NT_HPP_INCLUDED

include/boost/smart_ptr/detail/atomic_count_std_atomic.hpp

@@ -0,0 +1,67 @@
+#ifndef BOOST_SMART_PTR_DETAIL_ATOMIC_COUNT_STD_ATOMIC_HPP_INCLUDED
+#define BOOST_SMART_PTR_DETAIL_ATOMIC_COUNT_STD_ATOMIC_HPP_INCLUDED
+
+//
+//  boost/detail/atomic_count_std_atomic.hpp
+//
+//  atomic_count for std::atomic
+//
+//  Copyright 2013 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
+//
+
+#include <atomic>
+#include <cstdint>
+
+#if defined(BOOST_SP_REPORT_IMPLEMENTATION)
+
+#include <boost/config/pragma_message.hpp>
+BOOST_PRAGMA_MESSAGE("Using std::atomic atomic_count")
+
+#endif
+
+namespace boost
+{
+
+namespace detail
+{
+
+class atomic_count
+{
+public:
+
+    explicit atomic_count( long v ): value_( static_cast< std::int_least32_t >( v ) )
+    {
+    }
+
+    long operator++()
+    {
+        return value_.fetch_add( 1, std::memory_order_acq_rel ) + 1;
+    }
+
+    long operator--()
+    {
+        return value_.fetch_sub( 1, std::memory_order_acq_rel ) - 1;
+    }
+
+    operator long() const
+    {
+        return value_.load( std::memory_order_acquire );
+    }
+
+private:
+
+    atomic_count(atomic_count const &);
+    atomic_count & operator=(atomic_count const &);
+
+    std::atomic_int_least32_t value_;
+};
+
+} // namespace detail
+
+} // namespace boost
+
+#endif // #ifndef BOOST_SMART_PTR_DETAIL_ATOMIC_COUNT_STD_ATOMIC_HPP_INCLUDED

include/boost/smart_ptr/detail/deprecated_macros.hpp

@@ -0,0 +1,52 @@
+#ifndef BOOST_SMART_PTR_DETAIL_DEPRECATED_MACROS_HPP_INCLUDED
+#define BOOST_SMART_PTR_DETAIL_DEPRECATED_MACROS_HPP_INCLUDED
+
+// Copyright 2024 Peter Dimov
+// Distributed under the Boost Software License, Version 1.0.
+// https://www.boost.org/LICENSE_1_0.txt
+
+#include <boost/config/pragma_message.hpp>
+
+#if defined(BOOST_SP_ENABLE_DEBUG_HOOKS)
+
+BOOST_PRAGMA_MESSAGE("The macro BOOST_SP_ENABLE_DEBUG_HOOKS has been deprecated in 1.87 and support for it was removed in 1.90.")
+
+#endif
+
+#if defined(BOOST_SP_USE_STD_ALLOCATOR)
+
+BOOST_PRAGMA_MESSAGE("The macro BOOST_SP_USE_STD_ALLOCATOR has been deprecated in 1.87 and support for it was removed in 1.90.")
+
+#endif
+
+#if defined(BOOST_SP_USE_QUICK_ALLOCATOR)
+
+BOOST_PRAGMA_MESSAGE("The macro BOOST_SP_USE_QUICK_ALLOCATOR has been deprecated in 1.87 and support for it was removed in 1.90.")
+
+#endif
+
+#if defined(BOOST_AC_USE_SPINLOCK)
+
+BOOST_PRAGMA_MESSAGE("The macro BOOST_AC_USE_SPINLOCK has been deprecated in 1.87 and support for it was removed in 1.90.")
+
+#endif
+
+#if defined(BOOST_AC_USE_PTHREADS)
+
+BOOST_PRAGMA_MESSAGE("The macro BOOST_AC_USE_PTHREADS has been deprecated in 1.87 and support for it was removed in 1.90.")
+
+#endif
+
+#if defined(BOOST_SP_USE_SPINLOCK)
+
+BOOST_PRAGMA_MESSAGE("The macro BOOST_SP_USE_SPINLOCK has been deprecated in 1.87 and support for it was removed in 1.90.")
+
+#endif
+
+#if defined(BOOST_SP_USE_PTHREADS)
+
+BOOST_PRAGMA_MESSAGE("The macro BOOST_SP_USE_PTHREADS has been deprecated in 1.87 and support for it was removed in 1.90.")
+
+#endif
+
+#endif // #ifndef BOOST_SMART_PTR_DETAIL_DEPRECATED_MACROS_HPP_INCLUDED

include/boost/smart_ptr/detail/lightweight_mutex.hpp

@@ -0,0 +1,31 @@
+#ifndef BOOST_SMART_PTR_DETAIL_LIGHTWEIGHT_MUTEX_HPP_INCLUDED
+#define BOOST_SMART_PTR_DETAIL_LIGHTWEIGHT_MUTEX_HPP_INCLUDED
+
+// MS compatible compilers support #pragma once
+
+#if defined(_MSC_VER) && (_MSC_VER >= 1020)
+# pragma once
+#endif
+
+//
+//  boost/detail/lightweight_mutex.hpp - lightweight mutex
+//
+//  Copyright (c) 2002, 2003 Peter Dimov and Multi Media Ltd.
+//
+// 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)
+//
+//  typedef <unspecified> boost::detail::lightweight_mutex;
+//
+//  boost::detail::lightweight_mutex is a header-only implementation of
+//  a subset of the Mutex concept requirements:
+//
+//  http://www.boost.org/doc/html/threads/concepts.html#threads.concepts.Mutex
+//
+//  It's obsoleted by std::mutex.
+//
+
+#include <boost/smart_ptr/detail/lwm_std_mutex.hpp>
+
+#endif // #ifndef BOOST_SMART_PTR_DETAIL_LIGHTWEIGHT_MUTEX_HPP_INCLUDED

include/boost/smart_ptr/detail/lightweight_thread.hpp

@@ -0,0 +1,56 @@
+#ifndef BOOST_SMART_PTR_DETAIL_LIGHTWEIGHT_THREAD_HPP_INCLUDED
+#define BOOST_SMART_PTR_DETAIL_LIGHTWEIGHT_THREAD_HPP_INCLUDED
+
+// MS compatible compilers support #pragma once
+
+#if defined(_MSC_VER) && (_MSC_VER >= 1020)
+# pragma once
+#endif
+
+//  boost/detail/lightweight_thread.hpp
+//
+//  Copyright (c) 2002 Peter Dimov and Multi Media Ltd.
+//  Copyright (c) 2008, 2018 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
+//
+//
+//  typedef /*...*/ lw_thread_t; // as pthread_t
+//  template<class F> int lw_thread_create( lw_thread_t & th, F f );
+//  void lw_thread_join( lw_thread_t th );
+
+#include <thread>
+#include <exception>
+
+namespace boost
+{
+namespace detail
+{
+
+using lw_thread_t = std::thread*;
+
+template<class F> int lw_thread_create( lw_thread_t& th, F f )
+{
+    try
+    {
+        th = new std::thread( f );
+        return 0;
+    }
+    catch( std::exception const& )
+    {
+        return -1;
+    }
+}
+
+void lw_thread_join( lw_thread_t th )
+{
+    th->join();
+    delete th;
+}
+
+} // namespace detail
+} // namespace boost
+
+#endif // #ifndef BOOST_SMART_PTR_DETAIL_LIGHTWEIGHT_THREAD_HPP_INCLUDED

include/boost/smart_ptr/detail/local_counted_base.hpp

@@ -0,0 +1,144 @@
+#ifndef BOOST_SMART_PTR_DETAIL_LOCAL_COUNTED_BASE_HPP_INCLUDED
+#define BOOST_SMART_PTR_DETAIL_LOCAL_COUNTED_BASE_HPP_INCLUDED
+
+// MS compatible compilers support #pragma once
+
+#if defined(_MSC_VER) && (_MSC_VER >= 1020)
+# pragma once
+#endif
+
+//  detail/local_counted_base.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/detail/shared_count.hpp>
+#include <boost/config.hpp>
+#include <utility>
+
+namespace boost
+{
+
+namespace detail
+{
+
+class BOOST_SYMBOL_VISIBLE local_counted_base
+{
+private:
+
+    local_counted_base & operator= ( local_counted_base const & );
+
+private:
+
+    // not 'int' or 'unsigned' to avoid aliasing and enable optimizations
+    enum count_type { min_ = 0, initial_ = 1, max_ = 2147483647 };
+
+    count_type local_use_count_;
+
+public:
+
+    constexpr local_counted_base() noexcept: local_use_count_( initial_ )
+    {
+    }
+
+    constexpr local_counted_base( local_counted_base const & ) noexcept: local_use_count_( initial_ )
+    {
+    }
+
+    virtual ~local_counted_base() /*noexcept*/
+    {
+    }
+
+    virtual void local_cb_destroy() noexcept = 0;
+
+    virtual boost::detail::shared_count local_cb_get_shared_count() const noexcept = 0;
+
+    void add_ref() noexcept
+    {
+#if !defined(__NVCC__)
+#if defined( __has_builtin )
+# if __has_builtin( __builtin_assume )
+
+        __builtin_assume( local_use_count_ >= 1 );
+
+# endif
+#endif
+#endif
+
+        local_use_count_ = static_cast<count_type>( local_use_count_ + 1 );
+    }
+
+    void release() noexcept
+    {
+        local_use_count_ = static_cast<count_type>( local_use_count_ - 1 );
+
+        if( local_use_count_ == 0 )
+        {
+            local_cb_destroy();
+        }
+    }
+
+    long local_use_count() const noexcept
+    {
+        return local_use_count_;
+    }
+};
+
+class BOOST_SYMBOL_VISIBLE local_counted_impl: public local_counted_base
+{
+private:
+
+    local_counted_impl( local_counted_impl const & );
+
+private:
+
+    shared_count pn_;
+
+public:
+
+    explicit local_counted_impl( shared_count const& pn ) noexcept: pn_( pn )
+    {
+    }
+
+    explicit local_counted_impl( shared_count && pn ) noexcept: pn_( std::move(pn) )
+    {
+    }
+
+    void local_cb_destroy() noexcept override
+    {
+        delete this;
+    }
+
+    boost::detail::shared_count local_cb_get_shared_count() const noexcept override
+    {
+        return pn_;
+    }
+};
+
+class BOOST_SYMBOL_VISIBLE local_counted_impl_em: public local_counted_base
+{
+public:
+
+    shared_count pn_;
+
+    void local_cb_destroy() noexcept override
+    {
+        shared_count().swap( pn_ );
+    }
+
+    boost::detail::shared_count local_cb_get_shared_count() const noexcept override
+    {
+        return pn_;
+    }
+};
+
+} // namespace detail
+
+} // namespace boost
+
+#endif  // #ifndef BOOST_SMART_PTR_DETAIL_LOCAL_COUNTED_BASE_HPP_INCLUDED

include/boost/smart_ptr/detail/local_sp_deleter.hpp

@@ -0,0 +1,83 @@
+#ifndef BOOST_SMART_PTR_DETAIL_LOCAL_SP_DELETER_HPP_INCLUDED
+#define BOOST_SMART_PTR_DETAIL_LOCAL_SP_DELETER_HPP_INCLUDED
+
+// MS compatible compilers support #pragma once
+
+#if defined(_MSC_VER) && (_MSC_VER >= 1020)
+# pragma once
+#endif
+
+//  detail/local_sp_deleter.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/detail/local_counted_base.hpp>
+#include <boost/config.hpp>
+
+namespace boost
+{
+
+namespace detail
+{
+
+template<class D> class local_sp_deleter: public local_counted_impl_em
+{
+private:
+
+    D d_;
+
+public:
+
+    local_sp_deleter(): d_()
+    {
+    }
+
+    explicit local_sp_deleter( D const& d ) noexcept: d_( d )
+    {
+    }
+
+    explicit local_sp_deleter( D&& d ) noexcept: d_( std::move(d) )
+    {
+    }
+
+    D& deleter() noexcept
+    {
+        return d_;
+    }
+
+    template<class Y> void operator()( Y* p ) noexcept
+    {
+        d_( p );
+    }
+
+    void operator()( std::nullptr_t p ) noexcept
+    {
+        d_( p );
+    }
+};
+
+template<> class local_sp_deleter<void>
+{
+};
+
+template<class D> D * get_local_deleter( local_sp_deleter<D> * p ) noexcept
+{
+    return &p->deleter();
+}
+
+inline void * get_local_deleter( local_sp_deleter<void> * /*p*/ ) noexcept
+{
+    return 0;
+}
+
+} // namespace detail
+
+} // namespace boost
+
+#endif  // #ifndef BOOST_SMART_PTR_DETAIL_LOCAL_SP_DELETER_HPP_INCLUDED

include/boost/smart_ptr/detail/lwm_std_mutex.hpp

@@ -0,0 +1,62 @@
+#ifndef BOOST_SMART_PTR_DETAIL_LWM_STD_MUTEX_HPP_INCLUDED
+#define BOOST_SMART_PTR_DETAIL_LWM_STD_MUTEX_HPP_INCLUDED
+
+// Copyright 2020 Peter Dimov
+// Distributed under the Boost Software License, Version 1.0.
+// https://www.boost.org/LICENSE_1_0.txt)
+
+#include <boost/assert.hpp>
+#include <mutex>
+
+namespace boost
+{
+
+namespace detail
+{
+
+class lightweight_mutex
+{
+private:
+
+    std::mutex m_;
+
+    lightweight_mutex(lightweight_mutex const &);
+    lightweight_mutex & operator=(lightweight_mutex const &);
+
+public:
+
+    lightweight_mutex()
+    {
+    }
+
+    class scoped_lock;
+    friend class scoped_lock;
+
+    class scoped_lock
+    {
+    private:
+
+        std::mutex & m_;
+
+        scoped_lock(scoped_lock const &);
+        scoped_lock & operator=(scoped_lock const &);
+
+    public:
+
+        scoped_lock( lightweight_mutex & m ): m_( m.m_ )
+        {
+            m_.lock();
+        }
+
+        ~scoped_lock()
+        {
+            m_.unlock();
+        }
+    };
+};
+
+} // namespace detail
+
+} // namespace boost
+
+#endif // #ifndef BOOST_SMART_PTR_DETAIL_LWM_STD_MUTEX_HPP_INCLUDED

include/boost/smart_ptr/detail/quick_allocator.hpp

@@ -0,0 +1,63 @@
+#ifndef BOOST_SMART_PTR_DETAIL_QUICK_ALLOCATOR_HPP_INCLUDED
+#define BOOST_SMART_PTR_DETAIL_QUICK_ALLOCATOR_HPP_INCLUDED
+
+// Copyright 2003 David Abrahams
+// Copyright 2003, 2025 Peter Dimov
+// Distributed under the Boost Software License, Version 1.0.
+// https://www.boost.org/LICENSE_1_0.txt
+
+#include <boost/config/header_deprecated.hpp>
+#include <memory>
+#include <cstddef>
+
+BOOST_HEADER_DEPRECATED("std::allocator or std::pmr::synchronized_pool_resource")
+
+namespace boost
+{
+namespace detail
+{
+
+template<class T> struct quick_allocator
+{
+    static void* alloc()
+    {
+        return std::allocator<T>().allocate( 1 );
+    }
+
+    static void* alloc( std::size_t n )
+    {
+        if( n != sizeof(T) ) // class-specific delete called for a derived object
+        {
+            return ::operator new( n );
+        }
+        else
+        {
+            return alloc();
+        }
+    }
+
+    static void dealloc( void* p )
+    {
+        if( p != 0 ) // 18.4.1.1/13
+        {
+            std::allocator<T>().deallocate( static_cast<T*>( p ), 1 );
+        }
+    }
+
+    static void dealloc( void* p, std::size_t n )
+    {
+        if( n != sizeof(T) ) // class-specific delete called for a derived object
+        {
+            ::operator delete( p );
+        }
+        else
+        {
+            dealloc( p );
+        }
+    }
+};
+
+} // namespace detail
+} // namespace boost
+
+#endif  // #ifndef BOOST_SMART_PTR_DETAIL_QUICK_ALLOCATOR_HPP_INCLUDED

include/boost/smart_ptr/detail/shared_count.hpp

@@ -0,0 +1,581 @@
+#ifndef BOOST_SMART_PTR_DETAIL_SHARED_COUNT_HPP_INCLUDED
+#define BOOST_SMART_PTR_DETAIL_SHARED_COUNT_HPP_INCLUDED
+
+// MS compatible compilers support #pragma once
+
+#if defined(_MSC_VER) && (_MSC_VER >= 1020)
+# pragma once
+#endif
+
+//
+//  detail/shared_count.hpp
+//
+//  Copyright (c) 2001, 2002, 2003 Peter Dimov and Multi Media Ltd.
+//  Copyright 2004-2005 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)
+//
+
+#include <boost/smart_ptr/bad_weak_ptr.hpp>
+#include <boost/smart_ptr/detail/sp_counted_base.hpp>
+#include <boost/smart_ptr/detail/sp_counted_impl.hpp>
+#include <boost/smart_ptr/detail/sp_disable_deprecated.hpp>
+#include <boost/smart_ptr/detail/deprecated_macros.hpp>
+#include <boost/core/checked_delete.hpp>
+#include <boost/throw_exception.hpp>
+#include <boost/core/addressof.hpp>
+#include <boost/config.hpp>
+#include <boost/config/workaround.hpp>
+#include <cstdint>
+#include <memory>            // std::auto_ptr
+#include <functional>        // std::less
+#include <cstddef>           // std::size_t
+
+#ifdef BOOST_NO_EXCEPTIONS
+# include <new>              // std::bad_alloc
+#endif
+
+#if defined( BOOST_SP_DISABLE_DEPRECATED )
+#pragma GCC diagnostic push
+#pragma GCC diagnostic ignored "-Wdeprecated-declarations"
+#endif
+
+namespace boost
+{
+
+namespace movelib
+{
+
+template< class T, class D > class unique_ptr;
+
+} // namespace movelib
+
+namespace detail
+{
+
+struct sp_nothrow_tag {};
+
+template< class D > struct sp_inplace_tag
+{
+};
+
+template< class T > class sp_reference_wrapper
+{ 
+public:
+
+    explicit sp_reference_wrapper( T & t): t_( boost::addressof( t ) )
+    {
+    }
+
+    template< class Y > void operator()( Y * p ) const
+    {
+        (*t_)( p );
+    }
+
+private:
+
+    T * t_;
+};
+
+template< class D > struct sp_convert_reference
+{
+    typedef D type;
+};
+
+template< class D > struct sp_convert_reference< D& >
+{
+    typedef sp_reference_wrapper< D > type;
+};
+
+template<class T> std::size_t sp_hash_pointer( T* p ) noexcept
+{
+    std::uintptr_t v = reinterpret_cast<std::uintptr_t>( p );
+
+    // match boost::hash<T*>
+    return static_cast<std::size_t>( v + ( v >> 3 ) );
+}
+
+class weak_count;
+
+class shared_count
+{
+private:
+
+    sp_counted_base * pi_;
+
+    friend class weak_count;
+
+public:
+
+    constexpr shared_count() noexcept: pi_(0)
+    {
+    }
+
+    constexpr explicit shared_count( sp_counted_base * pi ) noexcept: pi_( pi )
+    {
+    }
+
+    template<class Y> explicit shared_count( Y * p ): pi_( 0 )
+    {
+#ifndef BOOST_NO_EXCEPTIONS
+
+        try
+        {
+            pi_ = new sp_counted_impl_p<Y>( p );
+        }
+        catch(...)
+        {
+            boost::checked_delete( p );
+            throw;
+        }
+
+#else
+
+        pi_ = new sp_counted_impl_p<Y>( p );
+
+        if( pi_ == 0 )
+        {
+            boost::checked_delete( p );
+            boost::throw_exception( std::bad_alloc() );
+        }
+
+#endif
+    }
+
+    template<class P, class D> shared_count( P p, D d ): pi_(0)
+    {
+#ifndef BOOST_NO_EXCEPTIONS
+
+        try
+        {
+            pi_ = new sp_counted_impl_pd<P, D>(p, d);
+        }
+        catch(...)
+        {
+            d(p); // delete p
+            throw;
+        }
+
+#else
+
+        pi_ = new sp_counted_impl_pd<P, D>(p, d);
+
+        if(pi_ == 0)
+        {
+            d(p); // delete p
+            boost::throw_exception(std::bad_alloc());
+        }
+
+#endif
+    }
+
+    template< class P, class D > shared_count( P p, sp_inplace_tag<D> ): pi_( 0 )
+    {
+#ifndef BOOST_NO_EXCEPTIONS
+
+        try
+        {
+            pi_ = new sp_counted_impl_pd< P, D >( p );
+        }
+        catch( ... )
+        {
+            D::operator_fn( p ); // delete p
+            throw;
+        }
+
+#else
+
+        pi_ = new sp_counted_impl_pd< P, D >( p );
+
+        if( pi_ == 0 )
+        {
+            D::operator_fn( p ); // delete p
+            boost::throw_exception( std::bad_alloc() );
+        }
+
+#endif // #ifndef BOOST_NO_EXCEPTIONS
+    }
+
+    template<class P, class D, class A> shared_count( P p, D d, A a ): pi_( 0 )
+    {
+        typedef sp_counted_impl_pda<P, D, A> impl_type;
+
+        typedef typename std::allocator_traits<A>::template rebind_alloc< impl_type > A2;
+
+        A2 a2( a );
+
+#ifndef BOOST_NO_EXCEPTIONS
+
+        try
+        {
+            pi_ = a2.allocate( 1 );
+            ::new( static_cast< void* >( pi_ ) ) impl_type( p, d, a );
+        }
+        catch(...)
+        {
+            d( p );
+
+            if( pi_ != 0 )
+            {
+                a2.deallocate( static_cast< impl_type* >( pi_ ), 1 );
+            }
+
+            throw;
+        }
+
+#else
+
+        pi_ = a2.allocate( 1 );
+
+        if( pi_ != 0 )
+        {
+            ::new( static_cast< void* >( pi_ ) ) impl_type( p, d, a );
+        }
+        else
+        {
+            d( p );
+            boost::throw_exception( std::bad_alloc() );
+        }
+
+#endif
+    }
+
+    template< class P, class D, class A > shared_count( P p, sp_inplace_tag< D >, A a ): pi_( 0 )
+    {
+        typedef sp_counted_impl_pda< P, D, A > impl_type;
+
+        typedef typename std::allocator_traits<A>::template rebind_alloc< impl_type > A2;
+
+        A2 a2( a );
+
+#ifndef BOOST_NO_EXCEPTIONS
+
+        try
+        {
+            pi_ = a2.allocate( 1 );
+            ::new( static_cast< void* >( pi_ ) ) impl_type( p, a );
+        }
+        catch(...)
+        {
+            D::operator_fn( p );
+
+            if( pi_ != 0 )
+            {
+                a2.deallocate( static_cast< impl_type* >( pi_ ), 1 );
+            }
+
+            throw;
+        }
+
+#else
+
+        pi_ = a2.allocate( 1 );
+
+        if( pi_ != 0 )
+        {
+            ::new( static_cast< void* >( pi_ ) ) impl_type( p, a );
+        }
+        else
+        {
+            D::operator_fn( p );
+            boost::throw_exception( std::bad_alloc() );
+        }
+
+#endif // #ifndef BOOST_NO_EXCEPTIONS
+    }
+
+#ifndef BOOST_NO_AUTO_PTR
+
+    // auto_ptr<Y> is special cased to provide the strong guarantee
+
+    template<class Y>
+    explicit shared_count( std::auto_ptr<Y> & r ): pi_( new sp_counted_impl_p<Y>( r.get() ) )
+    {
+#ifdef BOOST_NO_EXCEPTIONS
+
+        if( pi_ == 0 )
+        {
+            boost::throw_exception(std::bad_alloc());
+        }
+
+#endif
+
+        r.release();
+    }
+
+#endif 
+
+    template<class Y, class D>
+    explicit shared_count( std::unique_ptr<Y, D> & r ): pi_( 0 )
+    {
+        typedef typename sp_convert_reference<D>::type D2;
+
+        D2 d2( static_cast<D&&>( r.get_deleter() ) );
+        pi_ = new sp_counted_impl_pd< typename std::unique_ptr<Y, D>::pointer, D2 >( r.get(), d2 );
+
+#ifdef BOOST_NO_EXCEPTIONS
+
+        if( pi_ == 0 )
+        {
+            boost::throw_exception( std::bad_alloc() );
+        }
+
+#endif
+
+        r.release();
+    }
+
+    template<class Y, class D>
+    explicit shared_count( boost::movelib::unique_ptr<Y, D> & r ): pi_( 0 )
+    {
+        typedef typename sp_convert_reference<D>::type D2;
+
+        D2 d2( r.get_deleter() );
+        pi_ = new sp_counted_impl_pd< typename boost::movelib::unique_ptr<Y, D>::pointer, D2 >( r.get(), d2 );
+
+#ifdef BOOST_NO_EXCEPTIONS
+
+        if( pi_ == 0 )
+        {
+            boost::throw_exception( std::bad_alloc() );
+        }
+
+#endif
+
+        r.release();
+    }
+
+    ~shared_count() /*noexcept*/
+    {
+        if( pi_ != 0 ) pi_->release();
+    }
+
+    shared_count(shared_count const & r) noexcept: pi_(r.pi_)
+    {
+        if( pi_ != 0 ) pi_->add_ref_copy();
+    }
+
+    shared_count(shared_count && r) noexcept: pi_(r.pi_)
+    {
+        r.pi_ = 0;
+    }
+
+    explicit shared_count(weak_count const & r); // throws bad_weak_ptr when r.use_count() == 0
+    shared_count( weak_count const & r, sp_nothrow_tag ) noexcept; // constructs an empty *this when r.use_count() == 0
+
+    shared_count & operator= (shared_count const & r) noexcept
+    {
+        sp_counted_base * tmp = r.pi_;
+
+        if( tmp != pi_ )
+        {
+            if( tmp != 0 ) tmp->add_ref_copy();
+            if( pi_ != 0 ) pi_->release();
+            pi_ = tmp;
+        }
+
+        return *this;
+    }
+
+    void swap(shared_count & r) noexcept
+    {
+        sp_counted_base * tmp = r.pi_;
+        r.pi_ = pi_;
+        pi_ = tmp;
+    }
+
+    long use_count() const noexcept
+    {
+        return pi_ != 0? pi_->use_count(): 0;
+    }
+
+    bool unique() const noexcept
+    {
+        return use_count() == 1;
+    }
+
+    bool empty() const noexcept
+    {
+        return pi_ == 0;
+    }
+
+    bool operator==( shared_count const & r ) const noexcept
+    {
+        return pi_ == r.pi_;
+    }
+
+    bool operator==( weak_count const & r ) const noexcept;
+
+    bool operator<( shared_count const & r ) const noexcept
+    {
+        return std::less<sp_counted_base *>()( pi_, r.pi_ );
+    }
+
+    bool operator<( weak_count const & r ) const noexcept;
+
+    void * get_deleter( sp_typeinfo_ const & ti ) const noexcept
+    {
+        return pi_? pi_->get_deleter( ti ): 0;
+    }
+
+    void * get_local_deleter( sp_typeinfo_ const & ti ) const noexcept
+    {
+        return pi_? pi_->get_local_deleter( ti ): 0;
+    }
+
+    void * get_untyped_deleter() const noexcept
+    {
+        return pi_? pi_->get_untyped_deleter(): 0;
+    }
+
+    std::size_t hash_value() const noexcept
+    {
+        return sp_hash_pointer( pi_ );
+    }
+};
+
+
+class weak_count
+{
+private:
+
+    sp_counted_base * pi_;
+
+    friend class shared_count;
+
+public:
+
+    constexpr weak_count() noexcept: pi_(0)
+    {
+    }
+
+    weak_count(shared_count const & r) noexcept: pi_(r.pi_)
+    {
+        if(pi_ != 0) pi_->weak_add_ref();
+    }
+
+    weak_count(weak_count const & r) noexcept: pi_(r.pi_)
+    {
+        if(pi_ != 0) pi_->weak_add_ref();
+    }
+
+// Move support
+
+    weak_count(weak_count && r) noexcept: pi_(r.pi_)
+    {
+        r.pi_ = 0;
+    }
+
+    ~weak_count() /*noexcept*/
+    {
+        if(pi_ != 0) pi_->weak_release();
+    }
+
+    weak_count & operator= (shared_count const & r) noexcept
+    {
+        sp_counted_base * tmp = r.pi_;
+
+        if( tmp != pi_ )
+        {
+            if(tmp != 0) tmp->weak_add_ref();
+            if(pi_ != 0) pi_->weak_release();
+            pi_ = tmp;
+        }
+
+        return *this;
+    }
+
+    weak_count & operator= (weak_count const & r) noexcept
+    {
+        sp_counted_base * tmp = r.pi_;
+
+        if( tmp != pi_ )
+        {
+            if(tmp != 0) tmp->weak_add_ref();
+            if(pi_ != 0) pi_->weak_release();
+            pi_ = tmp;
+        }
+
+        return *this;
+    }
+
+    void swap(weak_count & r) noexcept
+    {
+        sp_counted_base * tmp = r.pi_;
+        r.pi_ = pi_;
+        pi_ = tmp;
+    }
+
+    long use_count() const noexcept
+    {
+        return pi_ != 0? pi_->use_count(): 0;
+    }
+
+    bool empty() const noexcept
+    {
+        return pi_ == 0;
+    }
+
+    bool operator==( weak_count const & r ) const noexcept
+    {
+        return pi_ == r.pi_;
+    }
+
+    bool operator==( shared_count const & r ) const noexcept
+    {
+        return pi_ == r.pi_;
+    }
+
+    bool operator<( weak_count const & r ) const noexcept
+    {
+        return std::less<sp_counted_base *>()( pi_, r.pi_ );
+    }
+
+    bool operator<( shared_count const & r ) const noexcept
+    {
+        return std::less<sp_counted_base *>()( pi_, r.pi_ );
+    }
+
+    std::size_t hash_value() const noexcept
+    {
+        return sp_hash_pointer( pi_ );
+    }
+};
+
+inline shared_count::shared_count( weak_count const & r ): pi_( r.pi_ )
+{
+    if( pi_ == 0 || !pi_->add_ref_lock() )
+    {
+        boost::throw_exception( boost::bad_weak_ptr() );
+    }
+}
+
+inline shared_count::shared_count( weak_count const & r, sp_nothrow_tag ) noexcept: pi_( r.pi_ )
+{
+    if( pi_ != 0 && !pi_->add_ref_lock() )
+    {
+        pi_ = 0;
+    }
+}
+
+inline bool shared_count::operator==( weak_count const & r ) const noexcept
+{
+    return pi_ == r.pi_;
+}
+
+inline bool shared_count::operator<( weak_count const & r ) const noexcept
+{
+    return std::less<sp_counted_base *>()( pi_, r.pi_ );
+}
+
+} // namespace detail
+
+} // namespace boost
+
+#if defined( BOOST_SP_DISABLE_DEPRECATED )
+#pragma GCC diagnostic pop
+#endif
+
+#endif  // #ifndef BOOST_SMART_PTR_DETAIL_SHARED_COUNT_HPP_INCLUDED

include/boost/smart_ptr/detail/sp_convertible.hpp

@@ -0,0 +1,76 @@
+#ifndef BOOST_SMART_PTR_DETAIL_SP_CONVERTIBLE_HPP_INCLUDED
+#define BOOST_SMART_PTR_DETAIL_SP_CONVERTIBLE_HPP_INCLUDED
+
+// MS compatible compilers support #pragma once
+
+#if defined(_MSC_VER) && (_MSC_VER >= 1020)
+# pragma once
+#endif
+
+//  detail/sp_convertible.hpp
+//
+//  Copyright 2008 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
+
+#include <boost/config.hpp>
+#include <cstddef>
+
+namespace boost
+{
+
+namespace detail
+{
+
+template< class Y, class T > struct sp_convertible
+{
+    typedef char (&yes) [1];
+    typedef char (&no)  [2];
+
+    static yes f( T* );
+    static no  f( ... );
+
+    enum _vt { value = sizeof( (f)( static_cast<Y*>(0) ) ) == sizeof(yes) };
+};
+
+template< class Y, class T > struct sp_convertible< Y, T[] >
+{
+    enum _vt { value = false };
+};
+
+template< class Y, class T > struct sp_convertible< Y[], T[] >
+{
+    enum _vt { value = sp_convertible< Y[1], T[1] >::value };
+};
+
+template< class Y, std::size_t N, class T > struct sp_convertible< Y[N], T[] >
+{
+    enum _vt { value = sp_convertible< Y[1], T[1] >::value };
+};
+
+struct sp_empty
+{
+};
+
+template< bool > struct sp_enable_if_convertible_impl;
+
+template<> struct sp_enable_if_convertible_impl<true>
+{
+    typedef sp_empty type;
+};
+
+template<> struct sp_enable_if_convertible_impl<false>
+{
+};
+
+template< class Y, class T > struct sp_enable_if_convertible: public sp_enable_if_convertible_impl< sp_convertible< Y, T >::value >
+{
+};
+
+} // namespace detail
+
+} // namespace boost
+
+#endif  // #ifndef BOOST_SMART_PTR_DETAIL_SP_CONVERTIBLE_HPP_INCLUDED

include/boost/smart_ptr/detail/sp_counted_base.hpp

@@ -0,0 +1,30 @@
+#ifndef BOOST_SMART_PTR_DETAIL_SP_COUNTED_BASE_HPP_INCLUDED
+#define BOOST_SMART_PTR_DETAIL_SP_COUNTED_BASE_HPP_INCLUDED
+
+// MS compatible compilers support #pragma once
+
+#if defined(_MSC_VER) && (_MSC_VER >= 1020)
+# pragma once
+#endif
+
+//
+//  detail/sp_counted_base.hpp
+//
+//  Copyright 2005-2013 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)
+//
+
+#include <boost/smart_ptr/detail/deprecated_macros.hpp>
+
+#if defined( BOOST_SP_DISABLE_THREADS )
+# include <boost/smart_ptr/detail/sp_counted_base_nt.hpp>
+
+#else
+# include <boost/smart_ptr/detail/sp_counted_base_std_atomic.hpp>
+
+#endif
+
+#endif  // #ifndef BOOST_SMART_PTR_DETAIL_SP_COUNTED_BASE_HPP_INCLUDED

include/boost/smart_ptr/detail/sp_counted_base_nt.hpp

@@ -0,0 +1,118 @@
+#ifndef BOOST_SMART_PTR_DETAIL_SP_COUNTED_BASE_NT_HPP_INCLUDED
+#define BOOST_SMART_PTR_DETAIL_SP_COUNTED_BASE_NT_HPP_INCLUDED
+
+// MS compatible compilers support #pragma once
+
+#if defined(_MSC_VER) && (_MSC_VER >= 1020)
+# pragma once
+#endif
+
+//
+//  detail/sp_counted_base_nt.hpp
+//
+//  Copyright (c) 2001, 2002, 2003 Peter Dimov and Multi Media Ltd.
+//  Copyright 2004-2005 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)
+//
+
+#include <boost/smart_ptr/detail/sp_typeinfo_.hpp>
+#include <boost/config.hpp>
+#include <cstdint>
+
+#if defined(BOOST_SP_REPORT_IMPLEMENTATION)
+
+#include <boost/config/pragma_message.hpp>
+BOOST_PRAGMA_MESSAGE("Using single-threaded, non-atomic sp_counted_base")
+
+#endif
+
+namespace boost
+{
+
+namespace detail
+{
+
+class BOOST_SYMBOL_VISIBLE sp_counted_base
+{
+private:
+
+    sp_counted_base( sp_counted_base const & );
+    sp_counted_base & operator= ( sp_counted_base const & );
+
+    std::int_least32_t use_count_;        // #shared
+    std::int_least32_t weak_count_;       // #weak + (#shared != 0)
+
+public:
+
+    sp_counted_base() noexcept: use_count_( 1 ), weak_count_( 1 )
+    {
+    }
+
+    virtual ~sp_counted_base() /*noexcept*/
+    {
+    }
+
+    // dispose() is called when use_count_ drops to zero, to release
+    // the resources managed by *this.
+
+    virtual void dispose() noexcept = 0; // nothrow
+
+    // destroy() is called when weak_count_ drops to zero.
+
+    virtual void destroy() noexcept // nothrow
+    {
+        delete this;
+    }
+
+    virtual void * get_deleter( sp_typeinfo_ const & ti ) noexcept = 0;
+    virtual void * get_local_deleter( sp_typeinfo_ const & ti ) noexcept = 0;
+    virtual void * get_untyped_deleter() noexcept = 0;
+
+    void add_ref_copy() noexcept
+    {
+        ++use_count_;
+    }
+
+    bool add_ref_lock() noexcept // true on success
+    {
+        if( use_count_ == 0 ) return false;
+        ++use_count_;
+        return true;
+    }
+
+    void release() noexcept
+    {
+        if( --use_count_ == 0 )
+        {
+            dispose();
+            weak_release();
+        }
+    }
+
+    void weak_add_ref() noexcept
+    {
+        ++weak_count_;
+    }
+
+    void weak_release() noexcept
+    {
+        if( --weak_count_ == 0 )
+        {
+            destroy();
+        }
+    }
+
+    long use_count() const noexcept
+    {
+        return use_count_;
+    }
+};
+
+} // namespace detail
+
+} // namespace boost
+
+#endif  // #ifndef BOOST_SMART_PTR_DETAIL_SP_COUNTED_BASE_NT_HPP_INCLUDED

include/boost/smart_ptr/detail/sp_counted_base_std_atomic.hpp

@@ -0,0 +1,146 @@
+#ifndef BOOST_SMART_PTR_DETAIL_SP_COUNTED_BASE_STD_ATOMIC_HPP_INCLUDED
+#define BOOST_SMART_PTR_DETAIL_SP_COUNTED_BASE_STD_ATOMIC_HPP_INCLUDED
+
+// MS compatible compilers support #pragma once
+
+#if defined(_MSC_VER) && (_MSC_VER >= 1020)
+# pragma once
+#endif
+
+//  detail/sp_counted_base_std_atomic.hpp - C++11 std::atomic
+//
+//  Copyright (c) 2007, 2013 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
+
+#include <boost/smart_ptr/detail/sp_typeinfo_.hpp>
+#include <boost/config.hpp>
+#include <atomic>
+#include <cstdint>
+
+#if defined(BOOST_SP_REPORT_IMPLEMENTATION)
+
+#include <boost/config/pragma_message.hpp>
+BOOST_PRAGMA_MESSAGE("Using std::atomic sp_counted_base")
+
+#endif
+
+namespace boost
+{
+
+namespace detail
+{
+
+inline void atomic_increment( std::atomic_int_least32_t * pw ) noexcept
+{
+    pw->fetch_add( 1, std::memory_order_relaxed );
+}
+
+inline std::int_least32_t atomic_decrement( std::atomic_int_least32_t * pw ) noexcept
+{
+    return pw->fetch_sub( 1, std::memory_order_acq_rel );
+}
+
+inline std::int_least32_t atomic_conditional_increment( std::atomic_int_least32_t * pw ) noexcept
+{
+    // long r = *pw;
+    // if( r != 0 ) ++*pw;
+    // return r;
+
+    std::int_least32_t r = pw->load( std::memory_order_relaxed );
+
+    for( ;; )
+    {
+        if( r == 0 )
+        {
+            return r;
+        }
+
+        if( pw->compare_exchange_weak( r, r + 1, std::memory_order_relaxed, std::memory_order_relaxed ) )
+        {
+            return r;
+        }
+    }    
+}
+
+class BOOST_SYMBOL_VISIBLE sp_counted_base
+{
+private:
+
+    sp_counted_base( sp_counted_base const & );
+    sp_counted_base & operator= ( sp_counted_base const & );
+
+    std::atomic_int_least32_t use_count_;   // #shared
+    std::atomic_int_least32_t weak_count_;  // #weak + (#shared != 0)
+
+public:
+
+    sp_counted_base() noexcept: use_count_( 1 ), weak_count_( 1 )
+    {
+    }
+
+    virtual ~sp_counted_base() /*noexcept*/
+    {
+    }
+
+    // dispose() is called when use_count_ drops to zero, to release
+    // the resources managed by *this.
+
+    virtual void dispose() noexcept = 0;
+
+    // destroy() is called when weak_count_ drops to zero.
+
+    virtual void destroy() noexcept
+    {
+        delete this;
+    }
+
+    virtual void * get_deleter( sp_typeinfo_ const & ti ) noexcept = 0;
+    virtual void * get_local_deleter( sp_typeinfo_ const & ti ) noexcept = 0;
+    virtual void * get_untyped_deleter() noexcept = 0;
+
+    void add_ref_copy() noexcept
+    {
+        atomic_increment( &use_count_ );
+    }
+
+    bool add_ref_lock() noexcept // true on success
+    {
+        return atomic_conditional_increment( &use_count_ ) != 0;
+    }
+
+    void release() noexcept
+    {
+        if( atomic_decrement( &use_count_ ) == 1 )
+        {
+            dispose();
+            weak_release();
+        }
+    }
+
+    void weak_add_ref() noexcept
+    {
+        atomic_increment( &weak_count_ );
+    }
+
+    void weak_release() noexcept
+    {
+        if( atomic_decrement( &weak_count_ ) == 1 )
+        {
+            destroy();
+        }
+    }
+
+    long use_count() const noexcept
+    {
+        return use_count_.load( std::memory_order_acquire );
+    }
+};
+
+} // namespace detail
+
+} // namespace boost
+
+#endif  // #ifndef BOOST_SMART_PTR_DETAIL_SP_COUNTED_BASE_STD_ATOMIC_HPP_INCLUDED

include/boost/smart_ptr/detail/sp_counted_impl.hpp

@@ -0,0 +1,193 @@
+#ifndef BOOST_SMART_PTR_DETAIL_SP_COUNTED_IMPL_HPP_INCLUDED
+#define BOOST_SMART_PTR_DETAIL_SP_COUNTED_IMPL_HPP_INCLUDED
+
+// MS compatible compilers support #pragma once
+
+#if defined(_MSC_VER) && (_MSC_VER >= 1020)
+# pragma once
+#endif
+
+//
+//  detail/sp_counted_impl.hpp
+//
+//  Copyright (c) 2001, 2002, 2003 Peter Dimov and Multi Media Ltd.
+//  Copyright 2004-2005 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)
+//
+
+#include <boost/smart_ptr/detail/sp_counted_base.hpp>
+#include <boost/smart_ptr/detail/deprecated_macros.hpp>
+#include <boost/core/checked_delete.hpp>
+#include <boost/core/addressof.hpp>
+#include <boost/config.hpp>
+
+#include <memory>           // std::allocator, std::allocator_traits
+#include <cstddef>          // std::size_t
+
+namespace boost
+{
+
+namespace detail
+{
+
+// get_local_deleter
+
+template<class D> class local_sp_deleter;
+
+template<class D> D * get_local_deleter( D * /*p*/ ) noexcept
+{
+    return 0;
+}
+
+template<class D> D * get_local_deleter( local_sp_deleter<D> * p ) noexcept;
+
+//
+
+template<class X> class BOOST_SYMBOL_VISIBLE sp_counted_impl_p: public sp_counted_base
+{
+private:
+
+    X * px_;
+
+    sp_counted_impl_p( sp_counted_impl_p const & );
+    sp_counted_impl_p & operator= ( sp_counted_impl_p const & );
+
+    typedef sp_counted_impl_p<X> this_type;
+
+public:
+
+    explicit sp_counted_impl_p( X * px ): px_( px )
+    {
+    }
+
+    void dispose() noexcept override
+    {
+        boost::checked_delete( px_ );
+    }
+
+    void * get_deleter( sp_typeinfo_ const & ) noexcept override
+    {
+        return 0;
+    }
+
+    void * get_local_deleter( sp_typeinfo_ const & ) noexcept override
+    {
+        return 0;
+    }
+
+    void * get_untyped_deleter() noexcept override
+    {
+        return 0;
+    }
+};
+
+template<class P, class D> class BOOST_SYMBOL_VISIBLE sp_counted_impl_pd: public sp_counted_base
+{
+private:
+
+    P ptr; // copy constructor must not throw
+    D del; // copy/move constructor must not throw
+
+    sp_counted_impl_pd( sp_counted_impl_pd const & );
+    sp_counted_impl_pd & operator= ( sp_counted_impl_pd const & );
+
+    typedef sp_counted_impl_pd<P, D> this_type;
+
+public:
+
+    // pre: d(p) must not throw
+
+    sp_counted_impl_pd( P p, D & d ): ptr( p ), del( static_cast< D&& >( d ) )
+    {
+    }
+
+    sp_counted_impl_pd( P p ): ptr( p ), del()
+    {
+    }
+
+    void dispose() noexcept override
+    {
+        del( ptr );
+    }
+
+    void * get_deleter( sp_typeinfo_ const & ti ) noexcept override
+    {
+        return ti == BOOST_SP_TYPEID_(D)? &reinterpret_cast<char&>( del ): 0;
+    }
+
+    void * get_local_deleter( sp_typeinfo_ const & ti ) noexcept override
+    {
+        return ti == BOOST_SP_TYPEID_(D)? boost::detail::get_local_deleter( boost::addressof( del ) ): 0;
+    }
+
+    void * get_untyped_deleter() noexcept override
+    {
+        return &reinterpret_cast<char&>( del );
+    }
+};
+
+template<class P, class D, class A> class BOOST_SYMBOL_VISIBLE sp_counted_impl_pda: public sp_counted_base
+{
+private:
+
+    P p_; // copy constructor must not throw
+    D d_; // copy/move constructor must not throw
+    A a_; // copy constructor must not throw
+
+    sp_counted_impl_pda( sp_counted_impl_pda const & );
+    sp_counted_impl_pda & operator= ( sp_counted_impl_pda const & );
+
+    typedef sp_counted_impl_pda<P, D, A> this_type;
+
+public:
+
+    // pre: d( p ) must not throw
+
+    sp_counted_impl_pda( P p, D & d, A a ): p_( p ), d_( static_cast< D&& >( d ) ), a_( a )
+    {
+    }
+
+    sp_counted_impl_pda( P p, A a ): p_( p ), d_( a ), a_( a )
+    {
+    }
+
+    void dispose() noexcept override
+    {
+        d_( p_ );
+    }
+
+    void destroy() noexcept override
+    {
+        typedef typename std::allocator_traits<A>::template rebind_alloc< this_type > A2;
+
+        A2 a2( a_ );
+
+        this->~this_type();
+
+        a2.deallocate( this, 1 );
+    }
+
+    void * get_deleter( sp_typeinfo_ const & ti ) noexcept override
+    {
+        return ti == BOOST_SP_TYPEID_( D )? &reinterpret_cast<char&>( d_ ): 0;
+    }
+
+    void * get_local_deleter( sp_typeinfo_ const & ti ) noexcept override
+    {
+        return ti == BOOST_SP_TYPEID_( D )? boost::detail::get_local_deleter( boost::addressof( d_ ) ): 0;
+    }
+
+    void * get_untyped_deleter() noexcept override
+    {
+        return &reinterpret_cast<char&>( d_ );
+    }
+};
+
+} // namespace detail
+
+} // namespace boost
+
+#endif  // #ifndef BOOST_SMART_PTR_DETAIL_SP_COUNTED_IMPL_HPP_INCLUDED

include/boost/smart_ptr/detail/sp_cxx20_constexpr.hpp

@@ -0,0 +1,37 @@
+#ifndef BOOST_SMART_PTR_DETAIL_SP_CXX20_CONSTEXPR_HPP_INCLUDED
+#define BOOST_SMART_PTR_DETAIL_SP_CXX20_CONSTEXPR_HPP_INCLUDED
+
+// MS compatible compilers support #pragma once
+
+#if defined(_MSC_VER) && (_MSC_VER >= 1020)
+#pragma once
+#endif
+
+//  detail/sp_noexcept.hpp
+//
+//  Copyright 2025 Mathias Stearn
+//
+//  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
+
+
+// This macro is used to mark functions as constexpr if the compiler supports
+// constexpr destructors. Since you can't have a constexpr smart pointer object,
+// everything except null constructors are guided behind this macro. Because
+// this also guards a use of dynamic_cast, we need to check for its availability
+// as well. It isn't worth splitting out since all known compilers that support
+// constexpr dynamic_cast also support constexpr destructors.
+//
+// WARNING: This does not check for changing active member of a union in
+// constant expressions which is allowed in C++20. If that is needed, we
+// need to raise the checked version to 202002L.
+#if defined(__cpp_constexpr_dynamic_alloc) && __cpp_constexpr_dynamic_alloc >= 201907L \
+    && defined(__cpp_constexpr) && __cpp_constexpr >= 201907L
+#define BOOST_SP_CXX20_CONSTEXPR constexpr
+#else
+#define BOOST_SP_CXX20_CONSTEXPR
+#define BOOST_SP_NO_CXX20_CONSTEXPR
+#endif
+
+#endif // #ifndef BOOST_SMART_PTR_DETAIL_SP_CXX20_CONSTEXPR_HPP_INCLUDED

include/boost/smart_ptr/detail/sp_disable_deprecated.hpp

@@ -0,0 +1,40 @@
+#ifndef BOOST_SMART_PTR_DETAIL_SP_DISABLE_DEPRECATED_HPP_INCLUDED
+#define BOOST_SMART_PTR_DETAIL_SP_DISABLE_DEPRECATED_HPP_INCLUDED
+
+// MS compatible compilers support #pragma once
+
+#if defined(_MSC_VER) && (_MSC_VER >= 1020)
+# pragma once
+#endif
+
+//
+//  boost/smart_ptr/detail/sp_disable_deprecated.hpp
+//
+//  Copyright 2015 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)
+//
+
+#include <boost/config.hpp>
+
+#if defined( __GNUC__ ) && ( defined( __GXX_EXPERIMENTAL_CXX0X__ ) || ( __cplusplus >= 201103L ) )
+
+# if defined( BOOST_GCC )
+
+#  if BOOST_GCC >= 40600
+#   define BOOST_SP_DISABLE_DEPRECATED
+#  endif
+
+# elif defined( __clang__ ) && defined( __has_warning )
+
+#  if __has_warning( "-Wdeprecated-declarations" )
+#   define BOOST_SP_DISABLE_DEPRECATED
+#  endif
+
+# endif
+
+#endif
+
+#endif // #ifndef BOOST_SMART_PTR_DETAIL_SP_DISABLE_DEPRECATED_HPP_INCLUDED

include/boost/smart_ptr/detail/sp_noexcept.hpp

@@ -0,0 +1,39 @@
+#ifndef BOOST_SMART_PTR_DETAIL_SP_NOEXCEPT_HPP_INCLUDED
+#define BOOST_SMART_PTR_DETAIL_SP_NOEXCEPT_HPP_INCLUDED
+
+// MS compatible compilers support #pragma once
+
+#if defined(_MSC_VER) && (_MSC_VER >= 1020)
+# pragma once
+#endif
+
+//  detail/sp_noexcept.hpp
+//
+//  Copyright 2016, 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
+
+
+// BOOST_SP_NOEXCEPT (obsolete, only retained for compatibility)
+
+#define BOOST_SP_NOEXCEPT noexcept
+
+// BOOST_SP_NOEXCEPT_WITH_ASSERT (noexcept, unless a user assertion handler is present)
+
+#if defined(BOOST_DISABLE_ASSERTS) || ( defined(BOOST_ENABLE_ASSERT_DEBUG_HANDLER) && defined(NDEBUG) )
+
+#  define BOOST_SP_NOEXCEPT_WITH_ASSERT noexcept
+
+#elif defined(BOOST_ENABLE_ASSERT_HANDLER) || ( defined(BOOST_ENABLE_ASSERT_DEBUG_HANDLER) && !defined(NDEBUG) )
+
+#  define BOOST_SP_NOEXCEPT_WITH_ASSERT
+
+#else
+
+#  define BOOST_SP_NOEXCEPT_WITH_ASSERT noexcept
+
+#endif
+
+#endif  // #ifndef BOOST_SMART_PTR_DETAIL_SP_NOEXCEPT_HPP_INCLUDED

include/boost/smart_ptr/detail/sp_thread_pause.hpp

@@ -0,0 +1,23 @@
+#ifndef BOOST_SMART_PTR_DETAIL_SP_THREAD_PAUSE_HPP_INCLUDED
+#define BOOST_SMART_PTR_DETAIL_SP_THREAD_PAUSE_HPP_INCLUDED
+
+// Copyright 2023 Peter Dimov
+// Distributed under the Boost Software License, Version 1.0.
+// https://www.boost.org/LICENSE_1_0.txt
+
+#include <boost/core/yield_primitives.hpp>
+#include <boost/config/header_deprecated.hpp>
+
+BOOST_HEADER_DEPRECATED( "<boost/core/yield_primitives.hpp>" )
+
+namespace boost
+{
+namespace detail
+{
+
+using boost::core::sp_thread_pause;
+
+} // namespace detail
+} // namespace boost
+
+#endif // #ifndef BOOST_SMART_PTR_DETAIL_SP_THREAD_PAUSE_HPP_INCLUDED

include/boost/smart_ptr/detail/sp_thread_sleep.hpp

@@ -0,0 +1,23 @@
+#ifndef BOOST_SMART_PTR_DETAIL_SP_THREAD_SLEEP_HPP_INCLUDED
+#define BOOST_SMART_PTR_DETAIL_SP_THREAD_SLEEP_HPP_INCLUDED
+
+// Copyright 2023 Peter Dimov
+// Distributed under the Boost Software License, Version 1.0.
+// https://www.boost.org/LICENSE_1_0.txt
+
+#include <boost/core/yield_primitives.hpp>
+#include <boost/config/header_deprecated.hpp>
+
+BOOST_HEADER_DEPRECATED( "<boost/core/yield_primitives.hpp>" )
+
+namespace boost
+{
+namespace detail
+{
+
+using boost::core::sp_thread_sleep;
+
+} // namespace detail
+} // namespace boost
+
+#endif // #ifndef BOOST_SMART_PTR_DETAIL_SP_THREAD_SLEEP_HPP_INCLUDED

include/boost/smart_ptr/detail/sp_thread_yield.hpp

@@ -0,0 +1,23 @@
+#ifndef BOOST_SMART_PTR_DETAIL_SP_THREAD_YIELD_HPP_INCLUDED
+#define BOOST_SMART_PTR_DETAIL_SP_THREAD_YIELD_HPP_INCLUDED
+
+// Copyright 2023 Peter Dimov
+// Distributed under the Boost Software License, Version 1.0.
+// https://www.boost.org/LICENSE_1_0.txt
+
+#include <boost/core/yield_primitives.hpp>
+#include <boost/config/header_deprecated.hpp>
+
+BOOST_HEADER_DEPRECATED( "<boost/core/yield_primitives.hpp>" )
+
+namespace boost
+{
+namespace detail
+{
+
+using boost::core::sp_thread_yield;
+
+} // namespace detail
+} // namespace boost
+
+#endif // #ifndef BOOST_SMART_PTR_DETAIL_SP_THREAD_YIELD_HPP_INCLUDED

include/boost/smart_ptr/detail/sp_type_traits.hpp

@@ -0,0 +1,55 @@
+#ifndef BOOST_SMART_PTR_DETAIL_SP_TYPE_TRAITS_HPP_INCLUDED
+#define BOOST_SMART_PTR_DETAIL_SP_TYPE_TRAITS_HPP_INCLUDED
+
+// Copyright 2024 Peter Dimov
+// Distributed under the Boost Software License, Version 1.0.
+// https://www.boost.org/LICENSE_1_0.txt
+
+#include <type_traits>
+
+namespace boost
+{
+namespace detail
+{
+
+// std::is_bounded_array (C++20)
+
+template<class T> struct sp_is_bounded_array: std::false_type
+{
+};
+
+template<class T, std::size_t N> struct sp_is_bounded_array< T[N] >: std::true_type
+{
+};
+
+// std::is_unbounded_array (C++20)
+
+template<class T> struct sp_is_unbounded_array: std::false_type
+{
+};
+
+template<class T> struct sp_is_unbounded_array< T[] >: std::true_type
+{
+};
+
+// std::type_identity (C++20)
+
+template<class T> struct sp_type_identity
+{
+    typedef T type;
+};
+
+// boost::type_with_alignment
+
+template<std::size_t A> struct sp_type_with_alignment
+{
+    struct alignas(A) type
+    {
+        unsigned char padding[ A ];
+    };
+};
+
+} // namespace detail
+} // namespace boost
+
+#endif  // #ifndef BOOST_SMART_PTR_DETAIL_SP_TYPE_TRAITS_HPP_INCLUDED

include/boost/smart_ptr/detail/sp_typeinfo_.hpp

@@ -0,0 +1,58 @@
+#ifndef BOOST_SMART_PTR_DETAIL_SP_TYPEINFO_HPP_INCLUDED
+#define BOOST_SMART_PTR_DETAIL_SP_TYPEINFO_HPP_INCLUDED
+
+// MS compatible compilers support #pragma once
+
+#if defined(_MSC_VER) && (_MSC_VER >= 1020)
+# pragma once
+#endif
+
+//  smart_ptr/detail/sp_typeinfo_.hpp
+//
+//  Copyright 2007, 2019 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)
+
+#include <boost/config.hpp>
+
+#if defined( BOOST_NO_TYPEID ) || defined( BOOST_NO_STD_TYPEINFO )
+
+#include <boost/core/typeinfo.hpp>
+
+namespace boost
+{
+
+namespace detail
+{
+
+typedef boost::core::typeinfo sp_typeinfo_;
+
+} // namespace detail
+
+} // namespace boost
+
+#define BOOST_SP_TYPEID_(T) BOOST_CORE_TYPEID(T)
+
+#else // defined( BOOST_NO_TYPEID ) || defined( BOOST_NO_STD_TYPEINFO )
+
+#include <typeinfo>
+
+namespace boost
+{
+
+namespace detail
+{
+
+typedef std::type_info sp_typeinfo_;
+
+} // namespace detail
+
+} // namespace boost
+
+#define BOOST_SP_TYPEID_(T) typeid(T)
+
+#endif // defined( BOOST_NO_TYPEID ) || defined( BOOST_NO_STD_TYPEINFO )
+
+#endif  // #ifndef BOOST_SMART_PTR_DETAIL_SP_TYPEINFO_HPP_INCLUDED

include/boost/smart_ptr/detail/spinlock.hpp

@@ -0,0 +1,44 @@
+#ifndef BOOST_SMART_PTR_DETAIL_SPINLOCK_HPP_INCLUDED
+#define BOOST_SMART_PTR_DETAIL_SPINLOCK_HPP_INCLUDED
+
+// MS compatible compilers support #pragma once
+
+#if defined(_MSC_VER) && (_MSC_VER >= 1020)
+# pragma once
+#endif
+
+//
+//  boost/detail/spinlock.hpp
+//
+//  Copyright (c) 2008 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)
+//
+//  struct spinlock
+//  {
+//      void lock();
+//      bool try_lock();
+//      void unlock();
+//
+//      class scoped_lock;
+//  };
+//
+//  #define BOOST_DETAIL_SPINLOCK_INIT <unspecified>
+//
+
+#include <boost/smart_ptr/detail/deprecated_macros.hpp>
+
+#if defined(__clang__)
+
+// Old Clang versions have trouble with ATOMIC_FLAG_INIT
+# include <boost/smart_ptr/detail/spinlock_gcc_atomic.hpp>
+
+#else
+
+# include <boost/smart_ptr/detail/spinlock_std_atomic.hpp>
+
+#endif
+
+#endif // #ifndef BOOST_SMART_PTR_DETAIL_SPINLOCK_HPP_INCLUDED

include/boost/smart_ptr/detail/spinlock_gcc_atomic.hpp

@@ -0,0 +1,94 @@
+#ifndef BOOST_SMART_PTR_DETAIL_SPINLOCK_GCC_ATOMIC_HPP_INCLUDED
+#define BOOST_SMART_PTR_DETAIL_SPINLOCK_GCC_ATOMIC_HPP_INCLUDED
+
+// MS compatible compilers support #pragma once
+
+#if defined(_MSC_VER) && (_MSC_VER >= 1020)
+# pragma once
+#endif
+
+// Copyright 2008, 2020 Peter Dimov
+// Distributed under the Boost Software License, Version 1.0.
+// https://www.boost.org/LICENSE_1_0.txt
+
+#include <boost/smart_ptr/detail/yield_k.hpp>
+
+#if defined(BOOST_SP_REPORT_IMPLEMENTATION)
+
+#include <boost/config/pragma_message.hpp>
+BOOST_PRAGMA_MESSAGE("Using __atomic spinlock")
+
+#endif
+
+namespace boost
+{
+
+namespace detail
+{
+
+class spinlock
+{
+public:
+
+    // `bool` alignment is required for Apple PPC32
+    // https://github.com/boostorg/smart_ptr/issues/105
+    // https://github.com/PurpleI2P/i2pd/issues/1726
+    // https://gcc.gnu.org/bugzilla/show_bug.cgi?id=107590
+
+    union
+    {
+        unsigned char v_;
+        bool align_;
+    };
+
+public:
+
+    bool try_lock()
+    {
+        return __atomic_test_and_set( &v_, __ATOMIC_ACQUIRE ) == 0;
+    }
+
+    void lock()
+    {
+        for( unsigned k = 0; !try_lock(); ++k )
+        {
+            boost::detail::yield( k );
+        }
+    }
+
+    void unlock()
+    {
+        __atomic_clear( &v_, __ATOMIC_RELEASE );
+    }
+
+public:
+
+    class scoped_lock
+    {
+    private:
+
+        spinlock & sp_;
+
+        scoped_lock( scoped_lock const & );
+        scoped_lock & operator=( scoped_lock const & );
+
+    public:
+
+        explicit scoped_lock( spinlock & sp ): sp_( sp )
+        {
+            sp.lock();
+        }
+
+        ~scoped_lock()
+        {
+            sp_.unlock();
+        }
+    };
+};
+
+} // namespace detail
+} // namespace boost
+
+#define BOOST_DETAIL_SPINLOCK_INIT {{0}}
+
+#endif // #ifndef BOOST_SMART_PTR_DETAIL_SPINLOCK_GCC_ATOMIC_HPP_INCLUDED

include/boost/smart_ptr/detail/spinlock_pool.hpp

@@ -0,0 +1,91 @@
+#ifndef BOOST_SMART_PTR_DETAIL_SPINLOCK_POOL_HPP_INCLUDED
+#define BOOST_SMART_PTR_DETAIL_SPINLOCK_POOL_HPP_INCLUDED
+
+// MS compatible compilers support #pragma once
+
+#if defined(_MSC_VER) && (_MSC_VER >= 1020)
+# pragma once
+#endif
+
+//
+//  boost/detail/spinlock_pool.hpp
+//
+//  Copyright (c) 2008 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)
+//
+//  spinlock_pool<0> is reserved for atomic<>, when/if it arrives
+//  spinlock_pool<1> is reserved for shared_ptr reference counts
+//  spinlock_pool<2> is reserved for shared_ptr atomic access
+//
+
+#include <boost/config.hpp>
+#include <boost/smart_ptr/detail/spinlock.hpp>
+#include <cstddef>
+
+namespace boost
+{
+
+namespace detail
+{
+
+template< int M > class spinlock_pool
+{
+private:
+
+    static spinlock pool_[ 41 ];
+
+public:
+
+    static spinlock & spinlock_for( void const * pv )
+    {
+#if defined(__VMS) && __INITIAL_POINTER_SIZE == 64  
+        std::size_t i = reinterpret_cast< unsigned long long >( pv ) % 41;
+#else  
+        std::size_t i = reinterpret_cast< std::size_t >( pv ) % 41;
+#endif  
+        return pool_[ i ];
+    }
+
+    class scoped_lock
+    {
+    private:
+
+        spinlock & sp_;
+
+        scoped_lock( scoped_lock const & );
+        scoped_lock & operator=( scoped_lock const & );
+
+    public:
+
+        explicit scoped_lock( void const * pv ): sp_( spinlock_for( pv ) )
+        {
+            sp_.lock();
+        }
+
+        ~scoped_lock()
+        {
+            sp_.unlock();
+        }
+    };
+};
+
+template< int M > spinlock spinlock_pool< M >::pool_[ 41 ] =
+{
+    BOOST_DETAIL_SPINLOCK_INIT, BOOST_DETAIL_SPINLOCK_INIT, BOOST_DETAIL_SPINLOCK_INIT, BOOST_DETAIL_SPINLOCK_INIT, BOOST_DETAIL_SPINLOCK_INIT, 
+    BOOST_DETAIL_SPINLOCK_INIT, BOOST_DETAIL_SPINLOCK_INIT, BOOST_DETAIL_SPINLOCK_INIT, BOOST_DETAIL_SPINLOCK_INIT, BOOST_DETAIL_SPINLOCK_INIT, 
+    BOOST_DETAIL_SPINLOCK_INIT, BOOST_DETAIL_SPINLOCK_INIT, BOOST_DETAIL_SPINLOCK_INIT, BOOST_DETAIL_SPINLOCK_INIT, BOOST_DETAIL_SPINLOCK_INIT, 
+    BOOST_DETAIL_SPINLOCK_INIT, BOOST_DETAIL_SPINLOCK_INIT, BOOST_DETAIL_SPINLOCK_INIT, BOOST_DETAIL_SPINLOCK_INIT, BOOST_DETAIL_SPINLOCK_INIT, 
+    BOOST_DETAIL_SPINLOCK_INIT, BOOST_DETAIL_SPINLOCK_INIT, BOOST_DETAIL_SPINLOCK_INIT, BOOST_DETAIL_SPINLOCK_INIT, BOOST_DETAIL_SPINLOCK_INIT, 
+    BOOST_DETAIL_SPINLOCK_INIT, BOOST_DETAIL_SPINLOCK_INIT, BOOST_DETAIL_SPINLOCK_INIT, BOOST_DETAIL_SPINLOCK_INIT, BOOST_DETAIL_SPINLOCK_INIT, 
+    BOOST_DETAIL_SPINLOCK_INIT, BOOST_DETAIL_SPINLOCK_INIT, BOOST_DETAIL_SPINLOCK_INIT, BOOST_DETAIL_SPINLOCK_INIT, BOOST_DETAIL_SPINLOCK_INIT, 
+    BOOST_DETAIL_SPINLOCK_INIT, BOOST_DETAIL_SPINLOCK_INIT, BOOST_DETAIL_SPINLOCK_INIT, BOOST_DETAIL_SPINLOCK_INIT, BOOST_DETAIL_SPINLOCK_INIT, 
+    BOOST_DETAIL_SPINLOCK_INIT
+};
+
+} // namespace detail
+} // namespace boost
+
+#endif // #ifndef BOOST_SMART_PTR_DETAIL_SPINLOCK_POOL_HPP_INCLUDED

include/boost/smart_ptr/detail/spinlock_std_atomic.hpp

@@ -0,0 +1,90 @@
+#ifndef BOOST_SMART_PTR_DETAIL_SPINLOCK_STD_ATOMIC_HPP_INCLUDED
+#define BOOST_SMART_PTR_DETAIL_SPINLOCK_STD_ATOMIC_HPP_INCLUDED
+
+// MS compatible compilers support #pragma once
+
+#if defined(_MSC_VER) && (_MSC_VER >= 1020)
+# pragma once
+#endif
+
+//
+//  Copyright (c) 2014 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)
+//
+
+#include <boost/smart_ptr/detail/yield_k.hpp>
+#include <atomic>
+
+#if defined(BOOST_SP_REPORT_IMPLEMENTATION)
+
+#include <boost/config/pragma_message.hpp>
+BOOST_PRAGMA_MESSAGE("Using std::atomic spinlock")
+
+#endif
+
+namespace boost
+{
+
+namespace detail
+{
+
+class spinlock
+{
+public:
+
+    std::atomic_flag v_;
+
+public:
+
+    bool try_lock() noexcept
+    {
+        return !v_.test_and_set( std::memory_order_acquire );
+    }
+
+    void lock() noexcept
+    {
+        for( unsigned k = 0; !try_lock(); ++k )
+        {
+            boost::detail::yield( k );
+        }
+    }
+
+    void unlock() noexcept
+    {
+        v_ .clear( std::memory_order_release );
+    }
+
+public:
+
+    class scoped_lock
+    {
+    private:
+
+        spinlock & sp_;
+
+        scoped_lock( scoped_lock const & );
+        scoped_lock & operator=( scoped_lock const & );
+
+    public:
+
+        explicit scoped_lock( spinlock & sp ) noexcept: sp_( sp )
+        {
+            sp.lock();
+        }
+
+        ~scoped_lock() /*noexcept*/
+        {
+            sp_.unlock();
+        }
+    };
+};
+
+} // namespace detail
+} // namespace boost
+
+#define BOOST_DETAIL_SPINLOCK_INIT { ATOMIC_FLAG_INIT }
+
+#endif // #ifndef BOOST_SMART_PTR_DETAIL_SPINLOCK_STD_ATOMIC_HPP_INCLUDED

include/boost/smart_ptr/detail/yield_k.hpp

@@ -0,0 +1,49 @@
+#ifndef BOOST_SMART_PTR_DETAIL_YIELD_K_HPP_INCLUDED
+#define BOOST_SMART_PTR_DETAIL_YIELD_K_HPP_INCLUDED
+
+// MS compatible compilers support #pragma once
+
+#if defined(_MSC_VER) && (_MSC_VER >= 1020)
+# pragma once
+#endif
+
+// boost/smart_ptr/detail/yield_k.hpp
+//
+// Copyright 2008, 2020 Peter Dimov
+//
+// inline void boost::detail::yield( unsigned k );
+//
+//   Typical use:
+//   for( unsigned k = 0; !try_lock(); ++k ) yield( k );
+//
+// Distributed under the Boost Software License, Version 1.0.
+// https://www.boost.org/LICENSE_1_0.txt
+
+#include <boost/core/yield_primitives.hpp>
+
+namespace boost
+{
+
+namespace detail
+{
+
+inline void yield( unsigned k )
+{
+    // Experiments on Windows and Fedora 32 show that a single pause,
+    // followed by an immediate sp_thread_sleep(), is best.
+
+    if( k & 1 )
+    {
+        boost::core::sp_thread_sleep();
+    }
+    else
+    {
+        boost::core::sp_thread_pause();
+    }
+}
+
+} // namespace detail
+
+} // namespace boost
+
+#endif // #ifndef BOOST_SMART_PTR_DETAIL_YIELD_K_HPP_INCLUDED