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diff --git a/boost/smart_ptr/local_shared_ptr.hpp b/boost/smart_ptr/local_shared_ptr.hpp
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index 0000000000..0d1fa0182e
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+++ b/boost/smart_ptr/local_shared_ptr.hpp
@@ -0,0 +1,684 @@
+#ifndef BOOST_SMART_PTR_LOCAL_SHARED_PTR_HPP_INCLUDED
+#define BOOST_SMART_PTR_LOCAL_SHARED_PTR_HPP_INCLUDED
+
+//  local_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 local_shared_ptr;
+
+namespace detail
+{
+
+template< class E, class Y > inline void lsp_pointer_construct( boost::local_shared_ptr< E > * /*ppx*/, Y * p, boost::detail::local_counted_base * & pn )
+{
+    boost::detail::sp_assert_convertible< Y, E >();
+
+    typedef boost::detail::local_sp_deleter< boost::checked_deleter<Y> > D;
+
+    boost::shared_ptr<E> p2( p, D() );
+
+    D * pd = static_cast< D * >( p2._internal_get_untyped_deleter() );
+
+    pd->pn_ = p2._internal_count();
+
+    pn = pd;
+}
+
+template< class E, class Y > inline void lsp_pointer_construct( boost::local_shared_ptr< E[] > * /*ppx*/, Y * p, boost::detail::local_counted_base * & pn )
+{
+    boost::detail::sp_assert_convertible< Y[], E[] >();
+
+    typedef boost::detail::local_sp_deleter< boost::checked_array_deleter<E> > D;
+
+    boost::shared_ptr<E[]> p2( p, D() );
+
+    D * pd = static_cast< D * >( p2._internal_get_untyped_deleter() );
+
+    pd->pn_ = p2._internal_count();
+
+    pn = pd;
+}
+
+template< class E, std::size_t N, class Y > inline void lsp_pointer_construct( boost::local_shared_ptr< E[N] > * /*ppx*/, Y * p, boost::detail::local_counted_base * & pn )
+{
+    boost::detail::sp_assert_convertible< Y[N], E[N] >();
+
+    typedef boost::detail::local_sp_deleter< boost::checked_array_deleter<E> > D;
+
+    boost::shared_ptr<E[N]> p2( p, D() );
+
+    D * pd = static_cast< D * >( p2._internal_get_untyped_deleter() );
+
+    pd->pn_ = p2._internal_count();
+
+    pn = pd;
+}
+
+template< class E, class P, class D > inline void lsp_deleter_construct( boost::local_shared_ptr< E > * /*ppx*/, P p, D const& d, boost::detail::local_counted_base * & pn )
+{
+    typedef boost::detail::local_sp_deleter<D> D2;
+
+    boost::shared_ptr<E> p2( p, D2( d ) );
+
+    D2 * pd = static_cast< D2 * >( p2._internal_get_untyped_deleter() );
+
+    pd->pn_ = p2._internal_count();
+
+    pn = pd;
+}
+
+template< class E, class P, class D, class A > inline void lsp_allocator_construct( boost::local_shared_ptr< E > * /*ppx*/, P p, D const& d, A const& a, boost::detail::local_counted_base * & pn )
+{
+    typedef boost::detail::local_sp_deleter<D> D2;
+
+    boost::shared_ptr<E> p2( p, D2( d ), a );
+
+    D2 * pd = static_cast< D2 * >( p2._internal_get_untyped_deleter() );
+
+    pd->pn_ = p2._internal_count();
+
+    pn = pd;
+}
+
+struct lsp_internal_constructor_tag
+{
+};
+
+} // namespace detail
+
+//
+// local_shared_ptr
+//
+// as shared_ptr, but local to a thread.
+// reference count manipulations are non-atomic.
+//
+
+template<class T> class local_shared_ptr
+{
+private:
+
+    typedef local_shared_ptr this_type;
+
+public:
+
+    typedef typename boost::detail::sp_element<T>::type element_type;
+
+private:
+
+    element_type * px;
+    boost::detail::local_counted_base * pn;
+
+    template<class Y> friend class local_shared_ptr;
+
+public:
+
+    // destructor
+
+    ~local_shared_ptr() BOOST_SP_NOEXCEPT
+    {
+        if( pn )
+        {
+            pn->release();
+        }
+    }
+
+    // constructors
+
+    BOOST_CONSTEXPR local_shared_ptr() BOOST_SP_NOEXCEPT : px( 0 ), pn( 0 )
+    {
+    }
+
+#if !defined( BOOST_NO_CXX11_NULLPTR )
+
+    BOOST_CONSTEXPR local_shared_ptr( boost::detail::sp_nullptr_t ) BOOST_SP_NOEXCEPT : px( 0 ), pn( 0 )
+    {
+    }
+
+#endif
+
+    // internal constructor, used by make_shared
+    BOOST_CONSTEXPR local_shared_ptr( boost::detail::lsp_internal_constructor_tag, element_type * px_, boost::detail::local_counted_base * pn_ ) BOOST_SP_NOEXCEPT : px( px_ ), pn( pn_ )
+    {
+    }
+
+    template<class Y>
+    explicit local_shared_ptr( Y * p ): px( p ), pn( 0 )
+    {
+        boost::detail::lsp_pointer_construct( this, p, pn );
+    }
+
+    template<class Y, class D> local_shared_ptr( Y * p, D d ): px( p ), pn( 0 )
+    {
+        boost::detail::lsp_deleter_construct( this, p, d, pn );
+    }
+
+#if !defined( BOOST_NO_CXX11_NULLPTR )
+
+    template<class D> local_shared_ptr( boost::detail::sp_nullptr_t p, D d ): px( p ), pn( 0 )
+    {
+        boost::detail::lsp_deleter_construct( this, p, d, pn );
+    }
+
+#endif
+
+    template<class Y, class D, class A> local_shared_ptr( Y * p, D d, A a ): px( p ), pn( 0 )
+    {
+        boost::detail::lsp_allocator_construct( this, p, d, a, pn );
+    }
+
+#if !defined( BOOST_NO_CXX11_NULLPTR )
+
+    template<class D, class A> local_shared_ptr( boost::detail::sp_nullptr_t p, D d, A a ): px( p ), pn( 0 )
+    {
+        boost::detail::lsp_allocator_construct( this, p, d, a, pn );
+    }
+
+#endif
+
+    // construction from shared_ptr
+
+    template<class Y> local_shared_ptr( shared_ptr<Y> const & r,
+        typename boost::detail::sp_enable_if_convertible<Y, T>::type = boost::detail::sp_empty() )
+        : px( r.get() ), pn( 0 )
+    {
+        boost::detail::sp_assert_convertible< Y, T >();
+
+        if( r.use_count() != 0 )
+        {
+            pn = new boost::detail::local_counted_impl( r._internal_count() );
+        }
+    }
+
+#if !defined( BOOST_NO_CXX11_RVALUE_REFERENCES )
+
+    template<class Y> local_shared_ptr( shared_ptr<Y> && r,
+        typename boost::detail::sp_enable_if_convertible<Y, T>::type = boost::detail::sp_empty() )
+        : px( r.get() ), pn( 0 )
+    {
+        boost::detail::sp_assert_convertible< Y, T >();
+
+        if( r.use_count() != 0 )
+        {
+            pn = new boost::detail::local_counted_impl( r._internal_count() );
+            r.reset();
+        }
+    }
+
+#endif
+
+    // construction from unique_ptr
+
+#if !defined( BOOST_NO_CXX11_SMART_PTR ) && !defined( BOOST_NO_CXX11_RVALUE_REFERENCES )
+
+    template< class Y, class D >
+    local_shared_ptr( std::unique_ptr< Y, D > && r,
+        typename boost::detail::sp_enable_if_convertible<Y, T>::type = boost::detail::sp_empty() )
+        : px( r.get() ), pn( 0 )
+    {
+        boost::detail::sp_assert_convertible< Y, T >();
+
+        if( px )
+        {
+            pn = new boost::detail::local_counted_impl( shared_ptr<T>( std::move(r) )._internal_count() );
+        }
+    }
+
+#endif
+
+    template< class Y, class D >
+    local_shared_ptr( boost::movelib::unique_ptr< Y, D > r ); // !
+    //	: px( r.get() ), pn( new boost::detail::local_counted_impl( shared_ptr<T>( std::move(r) ) ) )
+    //{
+    //	boost::detail::sp_assert_convertible< Y, T >();
+    //}
+
+    // copy constructor
+
+    local_shared_ptr( local_shared_ptr const & r ) BOOST_SP_NOEXCEPT : px( r.px ), pn( r.pn )
+    {
+        if( pn )
+        {
+            pn->add_ref();
+        }
+    }
+
+    // move constructor
+
+#if !defined( BOOST_NO_CXX11_RVALUE_REFERENCES )
+
+    local_shared_ptr( local_shared_ptr && r ) BOOST_SP_NOEXCEPT : px( r.px ), pn( r.pn )
+    {
+        r.px = 0;
+        r.pn = 0;
+    }
+
+#endif
+
+    // converting copy constructor
+
+    template<class Y> local_shared_ptr( local_shared_ptr<Y> const & r,
+        typename boost::detail::sp_enable_if_convertible<Y, T>::type = boost::detail::sp_empty() ) BOOST_SP_NOEXCEPT
+        : px( r.px ), pn( r.pn )
+    {
+        boost::detail::sp_assert_convertible< Y, T >();
+
+        if( pn )
+        {
+            pn->add_ref();
+        }
+    }
+
+    // converting move constructor
+
+#if !defined( BOOST_NO_CXX11_RVALUE_REFERENCES )
+
+    template<class Y> local_shared_ptr( local_shared_ptr<Y> && r,
+        typename boost::detail::sp_enable_if_convertible<Y, T>::type = boost::detail::sp_empty() ) BOOST_SP_NOEXCEPT
+        : px( r.px ), pn( r.pn )
+    {
+        boost::detail::sp_assert_convertible< Y, T >();
+
+        r.px = 0;
+        r.pn = 0;
+    }
+
+#endif
+
+    // aliasing
+
+    template<class Y>
+    local_shared_ptr( local_shared_ptr<Y> const & r, element_type * p ) BOOST_SP_NOEXCEPT : px( p ), pn( r.pn )
+    {
+        if( pn )
+        {
+            pn->add_ref();
+        }
+    }
+
+#if !defined( BOOST_NO_CXX11_RVALUE_REFERENCES )
+
+    template<class Y>
+    local_shared_ptr( local_shared_ptr<Y> && r, element_type * p ) BOOST_SP_NOEXCEPT : px( p ), pn( r.pn )
+    {
+        r.px = 0;
+        r.pn = 0;
+    }
+
+#endif
+
+    // assignment
+
+    local_shared_ptr & operator=( local_shared_ptr const & r ) BOOST_SP_NOEXCEPT
+    {
+        local_shared_ptr( r ).swap( *this );
+        return *this;
+    }
+
+    template<class Y> local_shared_ptr & operator=( local_shared_ptr<Y> const & r ) BOOST_SP_NOEXCEPT
+    {
+        local_shared_ptr( r ).swap( *this );
+        return *this;
+    }
+
+#if !defined( BOOST_NO_CXX11_RVALUE_REFERENCES )
+
+    local_shared_ptr & operator=( local_shared_ptr && r ) BOOST_SP_NOEXCEPT
+    {
+        local_shared_ptr( std::move( r ) ).swap( *this );
+        return *this;
+    }
+
+    template<class Y>
+    local_shared_ptr & operator=( local_shared_ptr<Y> && r ) BOOST_SP_NOEXCEPT
+    {
+        local_shared_ptr( std::move( r ) ).swap( *this );
+        return *this;
+    }
+
+#endif
+
+#if !defined( BOOST_NO_CXX11_NULLPTR )
+
+    local_shared_ptr & operator=( boost::detail::sp_nullptr_t ) BOOST_SP_NOEXCEPT
+    {
+        local_shared_ptr().swap(*this);
+        return *this;
+    }
+
+#endif
+
+#if !defined( BOOST_NO_CXX11_SMART_PTR ) && !defined( BOOST_NO_CXX11_RVALUE_REFERENCES )
+
+    template<class Y, class D>
+    local_shared_ptr & operator=( std::unique_ptr<Y, D> && r )
+    {
+        local_shared_ptr( std::move(r) ).swap( *this );
+        return *this;
+    }
+
+#endif
+
+    template<class Y, class D>
+    local_shared_ptr & operator=( boost::movelib::unique_ptr<Y, D> r ); // !
+
+    // reset
+
+    void reset() BOOST_SP_NOEXCEPT
+    {
+        local_shared_ptr().swap( *this );
+    }
+
+    template<class Y> void reset( Y * p ) // Y must be complete
+    {
+        local_shared_ptr( p ).swap( *this );
+    }
+
+    template<class Y, class D> void reset( Y * p, D d )
+    {
+        local_shared_ptr( p, d ).swap( *this );
+    }
+
+    template<class Y, class D, class A> void reset( Y * p, D d, A a )
+    {
+        local_shared_ptr( p, d, a ).swap( *this );
+    }
+
+    template<class Y> void reset( local_shared_ptr<Y> const & r, element_type * p ) BOOST_SP_NOEXCEPT
+    {
+        local_shared_ptr( r, p ).swap( *this );
+    }
+
+#if !defined( BOOST_NO_CXX11_RVALUE_REFERENCES )
+
+    template<class Y> void reset( local_shared_ptr<Y> && r, element_type * p ) BOOST_SP_NOEXCEPT
+    {
+        local_shared_ptr( std::move( r ), p ).swap( *this );
+    }
+
+#endif
+
+    // accessors
+
+    typename boost::detail::sp_dereference< T >::type operator* () const BOOST_SP_NOEXCEPT
+    {
+        return *px;
+    }
+
+    typename boost::detail::sp_member_access< T >::type operator-> () const BOOST_SP_NOEXCEPT
+    {
+        return px;
+    }
+
+    typename boost::detail::sp_array_access< T >::type operator[] ( std::ptrdiff_t i ) const BOOST_SP_NOEXCEPT_WITH_ASSERT
+    {
+        BOOST_ASSERT( px != 0 );
+        BOOST_ASSERT( i >= 0 && ( i < boost::detail::sp_extent< T >::value || boost::detail::sp_extent< T >::value == 0 ) );
+
+        return static_cast< typename boost::detail::sp_array_access< T >::type >( px[ i ] );
+    }
+
+    element_type * get() const BOOST_SP_NOEXCEPT
+    {
+        return px;
+    }
+
+    // implicit conversion to "bool"
+#include <boost/smart_ptr/detail/operator_bool.hpp>
+
+    long local_use_count() const BOOST_SP_NOEXCEPT
+    {
+        return pn? pn->local_use_count(): 0;
+    }
+
+    // conversions to shared_ptr, weak_ptr
+
+#if !defined( BOOST_SP_NO_SP_CONVERTIBLE ) && !defined(BOOST_NO_CXX11_FUNCTION_TEMPLATE_DEFAULT_ARGS)
+    template<class Y, class E = typename boost::detail::sp_enable_if_convertible<T,Y>::type> operator shared_ptr<Y>() const BOOST_SP_NOEXCEPT
+#else
+    template<class Y> operator shared_ptr<Y>() const BOOST_SP_NOEXCEPT
+#endif
+    {
+        boost::detail::sp_assert_convertible<T, Y>();
+
+        if( pn )
+        {
+            return shared_ptr<Y>( boost::detail::sp_internal_constructor_tag(), px, pn->local_cb_get_shared_count() );
+        }
+        else
+        {
+            return shared_ptr<Y>();
+        }
+    }
+
+#if !defined( BOOST_SP_NO_SP_CONVERTIBLE ) && !defined(BOOST_NO_CXX11_FUNCTION_TEMPLATE_DEFAULT_ARGS)
+    template<class Y, class E = typename boost::detail::sp_enable_if_convertible<T,Y>::type> operator weak_ptr<Y>() const BOOST_SP_NOEXCEPT
+#else
+    template<class Y> operator weak_ptr<Y>() const BOOST_SP_NOEXCEPT
+#endif
+    {
+        boost::detail::sp_assert_convertible<T, Y>();
+
+        if( pn )
+        {
+            return shared_ptr<Y>( boost::detail::sp_internal_constructor_tag(), px, pn->local_cb_get_shared_count() );
+        }
+        else
+        {
+            return weak_ptr<Y>();
+        }
+    }
+
+    // swap
+
+    void swap( local_shared_ptr & r ) BOOST_SP_NOEXCEPT
+    {
+        std::swap( px, r.px );
+        std::swap( pn, r.pn );
+    }
+
+    // owner_before
+
+    template<class Y> bool owner_before( local_shared_ptr<Y> const & r ) const BOOST_SP_NOEXCEPT
+    {
+        return std::less< boost::detail::local_counted_base* >()( pn, r.pn );
+    }
+};
+
+template<class T, class U> inline bool operator==( local_shared_ptr<T> const & a, local_shared_ptr<U> const & b ) BOOST_SP_NOEXCEPT
+{
+    return a.get() == b.get();
+}
+
+template<class T, class U> inline bool operator!=( local_shared_ptr<T> const & a, local_shared_ptr<U> const & b ) BOOST_SP_NOEXCEPT
+{
+    return a.get() != b.get();
+}
+
+#if !defined( BOOST_NO_CXX11_NULLPTR )
+
+template<class T> inline bool operator==( local_shared_ptr<T> const & p, boost::detail::sp_nullptr_t ) BOOST_SP_NOEXCEPT
+{
+    return p.get() == 0;
+}
+
+template<class T> inline bool operator==( boost::detail::sp_nullptr_t, local_shared_ptr<T> const & p ) BOOST_SP_NOEXCEPT
+{
+    return p.get() == 0;
+}
+
+template<class T> inline bool operator!=( local_shared_ptr<T> const & p, boost::detail::sp_nullptr_t ) BOOST_SP_NOEXCEPT
+{
+    return p.get() != 0;
+}
+
+template<class T> inline bool operator!=( boost::detail::sp_nullptr_t, local_shared_ptr<T> const & p ) BOOST_SP_NOEXCEPT
+{
+    return p.get() != 0;
+}
+
+#endif
+
+template<class T, class U> inline bool operator==( local_shared_ptr<T> const & a, shared_ptr<U> const & b ) BOOST_SP_NOEXCEPT
+{
+    return a.get() == b.get();
+}
+
+template<class T, class U> inline bool operator!=( local_shared_ptr<T> const & a, shared_ptr<U> const & b ) BOOST_SP_NOEXCEPT
+{
+    return a.get() != b.get();
+}
+
+template<class T, class U> inline bool operator==( shared_ptr<T> const & a, local_shared_ptr<U> const & b ) BOOST_SP_NOEXCEPT
+{
+    return a.get() == b.get();
+}
+
+template<class T, class U> inline bool operator!=( shared_ptr<T> const & a, local_shared_ptr<U> const & b ) BOOST_SP_NOEXCEPT
+{
+    return a.get() != b.get();
+}
+
+template<class T, class U> inline bool operator<(local_shared_ptr<T> const & a, local_shared_ptr<U> const & b) BOOST_SP_NOEXCEPT
+{
+    return a.owner_before( b );
+}
+
+template<class T> inline void swap( local_shared_ptr<T> & a, local_shared_ptr<T> & b ) BOOST_SP_NOEXCEPT
+{
+    a.swap( b );
+}
+
+template<class T, class U> local_shared_ptr<T> static_pointer_cast( local_shared_ptr<U> const & r ) BOOST_SP_NOEXCEPT
+{
+    (void) static_cast< T* >( static_cast< U* >( 0 ) );
+
+    typedef typename local_shared_ptr<T>::element_type E;
+
+    E * p = static_cast< E* >( r.get() );
+    return local_shared_ptr<T>( r, p );
+}
+
+template<class T, class U> local_shared_ptr<T> const_pointer_cast( local_shared_ptr<U> const & r ) BOOST_SP_NOEXCEPT
+{
+    (void) const_cast< T* >( static_cast< U* >( 0 ) );
+
+    typedef typename local_shared_ptr<T>::element_type E;
+
+    E * p = const_cast< E* >( r.get() );
+    return local_shared_ptr<T>( r, p );
+}
+
+template<class T, class U> local_shared_ptr<T> dynamic_pointer_cast( local_shared_ptr<U> const & r ) BOOST_SP_NOEXCEPT
+{
+    (void) dynamic_cast< T* >( static_cast< U* >( 0 ) );
+
+    typedef typename local_shared_ptr<T>::element_type E;
+
+    E * p = dynamic_cast< E* >( r.get() );
+    return p? local_shared_ptr<T>( r, p ): local_shared_ptr<T>();
+}
+
+template<class T, class U> local_shared_ptr<T> reinterpret_pointer_cast( local_shared_ptr<U> const & r ) BOOST_SP_NOEXCEPT
+{
+    (void) reinterpret_cast< T* >( static_cast< U* >( 0 ) );
+
+    typedef typename local_shared_ptr<T>::element_type E;
+
+    E * p = reinterpret_cast< E* >( r.get() );
+    return local_shared_ptr<T>( r, p );
+}
+
+#if !defined( BOOST_NO_CXX11_RVALUE_REFERENCES )
+
+template<class T, class U> local_shared_ptr<T> static_pointer_cast( local_shared_ptr<U> && r ) BOOST_SP_NOEXCEPT
+{
+    (void) static_cast< T* >( static_cast< U* >( 0 ) );
+
+    typedef typename local_shared_ptr<T>::element_type E;
+
+    E * p = static_cast< E* >( r.get() );
+    return local_shared_ptr<T>( std::move(r), p );
+}
+
+template<class T, class U> local_shared_ptr<T> const_pointer_cast( local_shared_ptr<U> && r ) BOOST_SP_NOEXCEPT
+{
+    (void) const_cast< T* >( static_cast< U* >( 0 ) );
+
+    typedef typename local_shared_ptr<T>::element_type E;
+
+    E * p = const_cast< E* >( r.get() );
+    return local_shared_ptr<T>( std::move(r), p );
+}
+
+template<class T, class U> local_shared_ptr<T> dynamic_pointer_cast( local_shared_ptr<U> && r ) BOOST_SP_NOEXCEPT
+{
+    (void) dynamic_cast< T* >( static_cast< U* >( 0 ) );
+
+    typedef typename local_shared_ptr<T>::element_type E;
+
+    E * p = dynamic_cast< E* >( r.get() );
+    return p? local_shared_ptr<T>( std::move(r), p ): local_shared_ptr<T>();
+}
+
+template<class T, class U> local_shared_ptr<T> reinterpret_pointer_cast( local_shared_ptr<U> && r ) BOOST_SP_NOEXCEPT
+{
+    (void) reinterpret_cast< T* >( static_cast< U* >( 0 ) );
+
+    typedef typename local_shared_ptr<T>::element_type E;
+
+    E * p = reinterpret_cast< E* >( r.get() );
+    return local_shared_ptr<T>( std::move(r), p );
+}
+
+#endif // !defined( BOOST_NO_CXX11_RVALUE_REFERENCES )
+
+// get_pointer() enables boost::mem_fn to recognize local_shared_ptr
+
+template<class T> inline typename local_shared_ptr<T>::element_type * get_pointer( local_shared_ptr<T> const & p ) BOOST_SP_NOEXCEPT
+{
+    return p.get();
+}
+
+// operator<<
+
+#if !defined(BOOST_NO_IOSTREAM)
+
+template<class E, class T, class Y> std::basic_ostream<E, T> & operator<< ( std::basic_ostream<E, T> & os, local_shared_ptr<Y> const & p )
+{
+    os << p.get();
+    return os;
+}
+
+#endif // !defined(BOOST_NO_IOSTREAM)
+
+// get_deleter
+
+template<class D, class T> D * get_deleter( local_shared_ptr<T> const & p ) BOOST_SP_NOEXCEPT
+{
+    return get_deleter<D>( shared_ptr<T>( p ) );
+}
+
+// hash_value
+
+template< class T > struct hash;
+
+template< class T > std::size_t hash_value( local_shared_ptr<T> const & p ) BOOST_SP_NOEXCEPT
+{
+    return boost::hash< typename local_shared_ptr<T>::element_type* >()( p.get() );
+}
+
+} // namespace boost
+
+#endif  // #ifndef BOOST_SMART_PTR_LOCAL_SHARED_PTR_HPP_INCLUDED