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 #ifndef BOOST_SMART_PTR_SHARED_PTR_HPP_INCLUDED
 #define BOOST_SMART_PTR_SHARED_PTR_HPP_INCLUDED
 
 //
 //  shared_ptr.hpp
 //
 //  (C) Copyright Greg Colvin and Beman Dawes 1998, 1999.
 //  Copyright (c) 2001-2008 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)
 //
 //  See http://www.boost.org/libs/smart_ptr/ for documentation.
 //
 
 #include <boost/smart_ptr/detail/shared_count.hpp>
 #include <boost/smart_ptr/detail/sp_convertible.hpp>
 #include <boost/smart_ptr/detail/sp_disable_deprecated.hpp>
 #include <boost/smart_ptr/detail/sp_noexcept.hpp>
 #include <boost/core/checked_delete.hpp>
 #include <boost/throw_exception.hpp>
 #include <boost/assert.hpp>
 #include <boost/config.hpp>
 #include <boost/config/workaround.hpp>
 
 #if !defined(BOOST_SP_NO_ATOMIC_ACCESS)
 #include <boost/smart_ptr/detail/spinlock_pool.hpp>
 #endif
 
 #include <algorithm>            // for std::swap
 #include <functional>           // for std::less
 #include <typeinfo>             // for std::bad_cast
 #include <cstddef>              // for std::size_t
 #include <memory>               // for std::auto_ptr
 #include <iosfwd>               // for std::basic_ostream
 
 #if defined( BOOST_SP_DISABLE_DEPRECATED )
 #pragma GCC diagnostic push
 #pragma GCC diagnostic ignored "-Wdeprecated-declarations"
 #endif
 
 namespace boost
 {
 
 template<class T> class shared_ptr;
 template<class T> class weak_ptr;
 template<class T> class enable_shared_from_this;
 class enable_shared_from_raw;
 
 namespace movelib
 {
 
     template< class T, class D > class unique_ptr;
 
 } // namespace movelib
 
 namespace detail
 {
 
 // sp_element, element_type
 
 template< class T > struct sp_element
 {
     typedef T type;
 };
 
 template< class T > struct sp_element< T[] >
 {
     typedef T type;
 };
 
 template< class T, std::size_t N > struct sp_element< T[N] >
 {
     typedef T type;
 };
 
 // sp_dereference, return type of operator*
 
 template< class T > struct sp_dereference
 {
     typedef T & type;
 };
 
 template<> struct sp_dereference< void >
 {
     typedef void type;
 };
 
 template<> struct sp_dereference< void const >
 {
     typedef void type;
 };
 
 template<> struct sp_dereference< void volatile >
 {
     typedef void type;
 };
 
 template<> struct sp_dereference< void const volatile >
 {
     typedef void type;
 };
 
 template< class T > struct sp_dereference< T[] >
 {
     typedef void type;
 };
 
 template< class T, std::size_t N > struct sp_dereference< T[N] >
 {
     typedef void type;
 };
 
 // sp_member_access, return type of operator->
 
 template< class T > struct sp_member_access
 {
     typedef T * type;
 };
 
 template< class T > struct sp_member_access< T[] >
 {
     typedef void type;
 };
 
 template< class T, std::size_t N > struct sp_member_access< T[N] >
 {
     typedef void type;
 };
 
 // sp_array_access, return type of operator[]
 
 template< class T > struct sp_array_access
 {
     typedef void type;
 };
 
 template< class T > struct sp_array_access< T[] >
 {
     typedef T & type;
 };
 
 template< class T, std::size_t N > struct sp_array_access< T[N] >
 {
     typedef T & type;
 };
 
 // sp_extent, for operator[] index check
 
 template< class T > struct sp_extent
 {
     enum _vt { value = 0 };
 };
 
 template< class T, std::size_t N > struct sp_extent< T[N] >
 {
     enum _vt { value = N };
 };
 
 // enable_shared_from_this support
 
 template< class X, class Y, class T > inline void sp_enable_shared_from_this( boost::shared_ptr<X> const * ppx, Y const * py, boost::enable_shared_from_this< T > const * pe )
 {
     if( pe != 0 )
     {
         pe->_internal_accept_owner( ppx, const_cast< Y* >( py ) );
     }
 }
 
 template< class X, class Y > inline void sp_enable_shared_from_this( boost::shared_ptr<X> * ppx, Y const * py, boost::enable_shared_from_raw const * pe );
 
 #ifdef _MANAGED
 
 // Avoid C4793, ... causes native code generation
 
 struct sp_any_pointer
 {
     template<class T> sp_any_pointer( T* ) {}
 };
 
 inline void sp_enable_shared_from_this( sp_any_pointer, sp_any_pointer, sp_any_pointer )
 {
 }
 
 #else // _MANAGED
 
 inline void sp_enable_shared_from_this( ... )
 {
 }
 
 #endif // _MANAGED
 
 // sp_assert_convertible
 
 template< class Y, class T > inline void sp_assert_convertible() noexcept
 {
     static_assert( sp_convertible< Y, T >::value, "incompatible pointer type" );
 }
 
 // pointer constructor helper
 
 template< class T, class Y > inline void sp_pointer_construct( boost::shared_ptr< T > * ppx, Y * p, boost::detail::shared_count & pn )
 {
     boost::detail::shared_count( p ).swap( pn );
     boost::detail::sp_enable_shared_from_this( ppx, p, p );
 }
 
 template< class T, class Y > inline void sp_pointer_construct( boost::shared_ptr< T[] > * /*ppx*/, Y * p, boost::detail::shared_count & pn )
 {
     sp_assert_convertible< Y[], T[] >();
     boost::detail::shared_count( p, boost::checked_array_deleter< T >() ).swap( pn );
 }
 
 template< class T, std::size_t N, class Y > inline void sp_pointer_construct( boost::shared_ptr< T[N] > * /*ppx*/, Y * p, boost::detail::shared_count & pn )
 {
     sp_assert_convertible< Y[N], T[N] >();
     boost::detail::shared_count( p, boost::checked_array_deleter< T >() ).swap( pn );
 }
 
 // deleter constructor helper
 
 template< class T, class Y > inline void sp_deleter_construct( boost::shared_ptr< T > * ppx, Y * p )
 {
     boost::detail::sp_enable_shared_from_this( ppx, p, p );
 }
 
 template< class T, class Y > inline void sp_deleter_construct( boost::shared_ptr< T[] > * /*ppx*/, Y * /*p*/ )
 {
     sp_assert_convertible< Y[], T[] >();
 }
 
 template< class T, std::size_t N, class Y > inline void sp_deleter_construct( boost::shared_ptr< T[N] > * /*ppx*/, Y * /*p*/ )
 {
     sp_assert_convertible< Y[N], T[N] >();
 }
 
 struct sp_internal_constructor_tag
 {
 };
 
 } // namespace detail
 
 
 //
 //  shared_ptr
 //
 //  An enhanced relative of scoped_ptr with reference counted copy semantics.
 //  The object pointed to is deleted when the last shared_ptr pointing to it
 //  is destroyed or reset.
 //
 
 template<class T> class shared_ptr
 {
 private:
 
     // Borland 5.5.1 specific workaround
     typedef shared_ptr<T> this_type;
 
 public:
 
     typedef typename boost::detail::sp_element< T >::type element_type;
 
     constexpr shared_ptr() noexcept : px( 0 ), pn()
     {
     }
 
     constexpr shared_ptr( std::nullptr_t ) noexcept : px( 0 ), pn()
     {
     }
 
     constexpr shared_ptr( boost::detail::sp_internal_constructor_tag, element_type * px_, boost::detail::shared_count const & pn_ ) noexcept : px( px_ ), pn( pn_ )
     {
     }
 
     constexpr shared_ptr( boost::detail::sp_internal_constructor_tag, element_type * px_, boost::detail::shared_count && pn_ ) noexcept : px( px_ ), pn( std::move( pn_ ) )
     {
     }
 
     template<class Y>
     explicit shared_ptr( Y * p ): px( p ), pn() // Y must be complete
     {
         boost::detail::sp_pointer_construct( this, p, pn );
     }
 
     //
     // Requirements: D's copy/move constructors must not throw
     //
     // shared_ptr will release p by calling d(p)
     //
 
     template<class Y, class D> shared_ptr( Y * p, D d ): px( p ), pn( p, static_cast< D&& >( d ) )
     {
         boost::detail::sp_deleter_construct( this, p );
     }
 
     template<class D> shared_ptr( std::nullptr_t p, D d ): px( p ), pn( p, static_cast< D&& >( d ) )
     {
     }
 
     // As above, but with allocator. A's copy constructor shall not throw.
 
     template<class Y, class D, class A> shared_ptr( Y * p, D d, A a ): px( p ), pn( p, static_cast< D&& >( d ), a )
     {
         boost::detail::sp_deleter_construct( this, p );
     }
 
     template<class D, class A> shared_ptr( std::nullptr_t p, D d, A a ): px( p ), pn( p, static_cast< D&& >( d ), a )
     {
     }
 
 //  generated copy constructor, destructor are fine...
 // ... except in C++0x, move disables the implicit copy
 
     shared_ptr( shared_ptr const & r ) noexcept : px( r.px ), pn( r.pn )
     {
     }
 
     template<class Y>
     explicit shared_ptr( weak_ptr<Y> const & r ): pn( r.pn ) // may throw
     {
         boost::detail::sp_assert_convertible< Y, T >();
 
         // it is now safe to copy r.px, as pn(r.pn) did not throw
         px = r.px;
     }
 
     template<class Y>
     shared_ptr( weak_ptr<Y> const & r, boost::detail::sp_nothrow_tag )
     noexcept : px( 0 ), pn( r.pn, boost::detail::sp_nothrow_tag() )
     {
         if( !pn.empty() )
         {
             px = r.px;
         }
     }
 
     template<class Y>
     shared_ptr( shared_ptr<Y> const & r, typename boost::detail::sp_enable_if_convertible<Y,T>::type = boost::detail::sp_empty() )
     noexcept : px( r.px ), pn( r.pn )
     {
         boost::detail::sp_assert_convertible< Y, T >();
     }
 
     // aliasing
     template< class Y >
     shared_ptr( shared_ptr<Y> const & r, element_type * p ) noexcept : px( p ), pn( r.pn )
     {
     }
 
 #ifndef BOOST_NO_AUTO_PTR
 
     template<class Y>
     explicit shared_ptr( std::auto_ptr<Y> & r ): px(r.get()), pn()
     {
         boost::detail::sp_assert_convertible< Y, T >();
 
         Y * tmp = r.get();
         pn = boost::detail::shared_count( r );
 
         boost::detail::sp_deleter_construct( this, tmp );
     }
 
     template<class Y>
     shared_ptr( std::auto_ptr<Y> && r ): px(r.get()), pn()
     {
         boost::detail::sp_assert_convertible< Y, T >();
 
         Y * tmp = r.get();
         pn = boost::detail::shared_count( r );
 
         boost::detail::sp_deleter_construct( this, tmp );
     }
 
 #endif // BOOST_NO_AUTO_PTR
 
     template< class Y, class D >
     shared_ptr( std::unique_ptr< Y, D > && r ): px( r.get() ), pn()
     {
         boost::detail::sp_assert_convertible< Y, T >();
 
         typename std::unique_ptr< Y, D >::pointer tmp = r.get();
 
         if( tmp != 0 )
         {
             pn = boost::detail::shared_count( r );
             boost::detail::sp_deleter_construct( this, tmp );
         }
     }
 
     template< class Y, class D >
     shared_ptr( boost::movelib::unique_ptr< Y, D > r ): px( r.get() ), pn()
     {
         boost::detail::sp_assert_convertible< Y, T >();
 
         typename boost::movelib::unique_ptr< Y, D >::pointer tmp = r.get();
 
         if( tmp != 0 )
         {
             pn = boost::detail::shared_count( r );
             boost::detail::sp_deleter_construct( this, tmp );
         }
     }
 
     // assignment
 
     shared_ptr & operator=( shared_ptr const & r ) noexcept
     {
         this_type(r).swap(*this);
         return *this;
     }
 
     template<class Y>
     shared_ptr & operator=(shared_ptr<Y> const & r) noexcept
     {
         this_type(r).swap(*this);
         return *this;
     }
 
 #ifndef BOOST_NO_AUTO_PTR
 
     template<class Y>
     shared_ptr & operator=( std::auto_ptr<Y> & r )
     {
         this_type( r ).swap( *this );
         return *this;
     }
 
     template<class Y>
     shared_ptr & operator=( std::auto_ptr<Y> && r )
     {
         this_type( static_cast< std::auto_ptr<Y> && >( r ) ).swap( *this );
         return *this;
     }
 
 #endif // BOOST_NO_AUTO_PTR
 
     template<class Y, class D>
     shared_ptr & operator=( std::unique_ptr<Y, D> && r )
     {
         this_type( static_cast< std::unique_ptr<Y, D> && >( r ) ).swap(*this);
         return *this;
     }
 
     template<class Y, class D>
     shared_ptr & operator=( boost::movelib::unique_ptr<Y, D> r )
     {
         // this_type( static_cast< unique_ptr<Y, D> && >( r ) ).swap( *this );
 
         boost::detail::sp_assert_convertible< Y, T >();
 
         typename boost::movelib::unique_ptr< Y, D >::pointer p = r.get();
 
         shared_ptr tmp;
 
         if( p != 0 )
         {
             tmp.px = p;
             tmp.pn = boost::detail::shared_count( r );
 
             boost::detail::sp_deleter_construct( &tmp, p );
         }
 
         tmp.swap( *this );
 
         return *this;
     }
 
 // Move support
 
     shared_ptr( shared_ptr && r ) noexcept : px( r.px ), pn( static_cast< boost::detail::shared_count && >( r.pn ) )
     {
         r.px = 0;
     }
 
     template<class Y>
     shared_ptr( shared_ptr<Y> && r, typename boost::detail::sp_enable_if_convertible<Y,T>::type = boost::detail::sp_empty() )
     noexcept : px( r.px ), pn( static_cast< boost::detail::shared_count && >( r.pn ) )
     {
         boost::detail::sp_assert_convertible< Y, T >();
         r.px = 0;
     }
 
     shared_ptr & operator=( shared_ptr && r ) noexcept
     {
         this_type( static_cast< shared_ptr && >( r ) ).swap( *this );
         return *this;
     }
 
     template<class Y>
     shared_ptr & operator=( shared_ptr<Y> && r ) noexcept
     {
         this_type( static_cast< shared_ptr<Y> && >( r ) ).swap( *this );
         return *this;
     }
 
     // aliasing move
     template<class Y>
     shared_ptr( shared_ptr<Y> && r, element_type * p ) noexcept : px( p ), pn()
     {
         pn.swap( r.pn );
         r.px = 0;
     }
 
     shared_ptr & operator=( std::nullptr_t ) noexcept
     {
         this_type().swap(*this);
         return *this;
     }
 
     void reset() noexcept
     {
         this_type().swap(*this);
     }
 
     template<class Y> void reset( Y * p ) // Y must be complete
     {
         BOOST_ASSERT( p == 0 || p != px ); // catch self-reset errors
         this_type( p ).swap( *this );
     }
 
     template<class Y, class D> void reset( Y * p, D d )
     {
         this_type( p, static_cast< D&& >( d ) ).swap( *this );
     }
 
     template<class Y, class D, class A> void reset( Y * p, D d, A a )
     {
         this_type( p, static_cast< D&& >( d ), a ).swap( *this );
     }
 
     template<class Y> void reset( shared_ptr<Y> const & r, element_type * p ) noexcept
     {
         this_type( r, p ).swap( *this );
     }
 
     template<class Y> void reset( shared_ptr<Y> && r, element_type * p ) noexcept
     {
         this_type( static_cast< shared_ptr<Y> && >( r ), p ).swap( *this );
     }
 
     typename boost::detail::sp_dereference< T >::type operator* () const BOOST_SP_NOEXCEPT_WITH_ASSERT
     {
         BOOST_ASSERT( px != 0 );
         return *px;
     }
     
     typename boost::detail::sp_member_access< T >::type operator-> () const BOOST_SP_NOEXCEPT_WITH_ASSERT
     {
         BOOST_ASSERT( px != 0 );
         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 noexcept
     {
         return px;
     }
 
     explicit operator bool () const noexcept
     {
         return px != 0;
     }
 
     bool unique() const noexcept
     {
         return pn.unique();
     }
 
     long use_count() const noexcept
     {
         return pn.use_count();
     }
 
     void swap( shared_ptr & other ) noexcept
     {
         std::swap(px, other.px);
         pn.swap(other.pn);
     }
 
     template<class Y> bool owner_before( shared_ptr<Y> const & rhs ) const noexcept
     {
         return pn < rhs.pn;
     }
 
     template<class Y> bool owner_before( weak_ptr<Y> const & rhs ) const noexcept
     {
         return pn < rhs.pn;
     }
 
     template<class Y> bool owner_equals( shared_ptr<Y> const & rhs ) const noexcept
     {
         return pn == rhs.pn;
     }
 
     template<class Y> bool owner_equals( weak_ptr<Y> const & rhs ) const noexcept
     {
         return pn == rhs.pn;
     }
 
     std::size_t owner_hash_value() const noexcept
     {
         return pn.hash_value();
     }
 
     void * _internal_get_deleter( boost::detail::sp_typeinfo_ const & ti ) const noexcept
     {
         return pn.get_deleter( ti );
     }
 
     void * _internal_get_local_deleter( boost::detail::sp_typeinfo_ const & ti ) const noexcept
     {
         return pn.get_local_deleter( ti );
     }
 
     void * _internal_get_untyped_deleter() const noexcept
     {
         return pn.get_untyped_deleter();
     }
 
     bool _internal_equiv( shared_ptr const & r ) const noexcept
     {
         return px == r.px && pn == r.pn;
     }
 
     boost::detail::shared_count _internal_count() const noexcept
     {
         return pn;
     }
 
 private:
 
     template<class Y> friend class shared_ptr;
     template<class Y> friend class weak_ptr;
 
 
     element_type * px;                 // contained pointer
     boost::detail::shared_count pn;    // reference counter
 
 };  // shared_ptr
 
 template<class T, class U> inline bool operator==(shared_ptr<T> const & a, shared_ptr<U> const & b) noexcept
 {
     return a.get() == b.get();
 }
 
 template<class T, class U> inline bool operator!=(shared_ptr<T> const & a, shared_ptr<U> const & b) noexcept
 {
     return a.get() != b.get();
 }
 
 template<class T> inline bool operator==( shared_ptr<T> const & p, std::nullptr_t ) noexcept
 {
     return p.get() == 0;
 }
 
 template<class T> inline bool operator==( std::nullptr_t, shared_ptr<T> const & p ) noexcept
 {
     return p.get() == 0;
 }
 
 template<class T> inline bool operator!=( shared_ptr<T> const & p, std::nullptr_t ) noexcept
 {
     return p.get() != 0;
 }
 
 template<class T> inline bool operator!=( std::nullptr_t, shared_ptr<T> const & p ) noexcept
 {
     return p.get() != 0;
 }
 
 template<class T, class U> inline bool operator<(shared_ptr<T> const & a, shared_ptr<U> const & b) noexcept
 {
     return a.owner_before( b );
 }
 
 template<class T> inline void swap(shared_ptr<T> & a, shared_ptr<T> & b) noexcept
 {
     a.swap(b);
 }
 
 template<class T, class U> shared_ptr<T> static_pointer_cast( shared_ptr<U> const & r ) noexcept
 {
     (void) static_cast< T* >( static_cast< U* >( 0 ) );
 
     typedef typename shared_ptr<T>::element_type E;
 
     E * p = static_cast< E* >( r.get() );
     return shared_ptr<T>( r, p );
 }
 
 template<class T, class U> shared_ptr<T> const_pointer_cast( shared_ptr<U> const & r ) noexcept
 {
     (void) const_cast< T* >( static_cast< U* >( 0 ) );
 
     typedef typename shared_ptr<T>::element_type E;
 
     E * p = const_cast< E* >( r.get() );
     return shared_ptr<T>( r, p );
 }
 
 template<class T, class U> shared_ptr<T> dynamic_pointer_cast( shared_ptr<U> const & r ) noexcept
 {
     (void) dynamic_cast< T* >( static_cast< U* >( 0 ) );
 
     typedef typename shared_ptr<T>::element_type E;
 
     E * p = dynamic_cast< E* >( r.get() );
     return p? shared_ptr<T>( r, p ): shared_ptr<T>();
 }
 
 template<class T, class U> shared_ptr<T> reinterpret_pointer_cast( shared_ptr<U> const & r ) noexcept
 {
     (void) reinterpret_cast< T* >( static_cast< U* >( 0 ) );
 
     typedef typename shared_ptr<T>::element_type E;
 
     E * p = reinterpret_cast< E* >( r.get() );
     return shared_ptr<T>( r, p );
 }
 
 template<class T, class U> shared_ptr<T> static_pointer_cast( shared_ptr<U> && r ) noexcept
 {
     (void) static_cast< T* >( static_cast< U* >( 0 ) );
 
     typedef typename shared_ptr<T>::element_type E;
 
     E * p = static_cast< E* >( r.get() );
     return shared_ptr<T>( std::move(r), p );
 }
 
 template<class T, class U> shared_ptr<T> const_pointer_cast( shared_ptr<U> && r ) noexcept
 {
     (void) const_cast< T* >( static_cast< U* >( 0 ) );
 
     typedef typename shared_ptr<T>::element_type E;
 
     E * p = const_cast< E* >( r.get() );
     return shared_ptr<T>( std::move(r), p );
 }
 
 template<class T, class U> shared_ptr<T> dynamic_pointer_cast( shared_ptr<U> && r ) noexcept
 {
     (void) dynamic_cast< T* >( static_cast< U* >( 0 ) );
 
     typedef typename shared_ptr<T>::element_type E;
 
     E * p = dynamic_cast< E* >( r.get() );
     return p? shared_ptr<T>( std::move(r), p ): shared_ptr<T>();
 }
 
 template<class T, class U> shared_ptr<T> reinterpret_pointer_cast( shared_ptr<U> && r ) noexcept
 {
     (void) reinterpret_cast< T* >( static_cast< U* >( 0 ) );
 
     typedef typename shared_ptr<T>::element_type E;
 
     E * p = reinterpret_cast< E* >( r.get() );
     return shared_ptr<T>( std::move(r), p );
 }
 
 // get_pointer() enables boost::mem_fn to recognize shared_ptr
 
 template<class T> inline typename shared_ptr<T>::element_type * get_pointer(shared_ptr<T> const & p) noexcept
 {
     return p.get();
 }
 
 // operator<<
 
 template<class E, class T, class Y> std::basic_ostream<E, T> & operator<< (std::basic_ostream<E, T> & os, shared_ptr<Y> const & p)
 {
     os << p.get();
     return os;
 }
 
 // get_deleter
 
 namespace detail
 {
 
 template<class D, class T> D * basic_get_deleter( shared_ptr<T> const & p ) noexcept
 {
     return static_cast<D *>( p._internal_get_deleter(BOOST_SP_TYPEID_(D)) );
 }
 
 template<class D, class T> D * basic_get_local_deleter( D *, shared_ptr<T> const & p ) noexcept;
 template<class D, class T> D const * basic_get_local_deleter( D const *, shared_ptr<T> const & p ) noexcept;
 
 class esft2_deleter_wrapper
 {
 private:
 
     shared_ptr<void const volatile> deleter_;
 
 public:
 
     esft2_deleter_wrapper() noexcept
     {
     }
 
     template< class T > void set_deleter( shared_ptr<T> const & deleter ) noexcept
     {
         deleter_ = deleter;
     }
 
     template<typename D> D* get_deleter() const noexcept
     {
         return boost::detail::basic_get_deleter<D>( deleter_ );
     }
 
     template< class T> void operator()( T* ) BOOST_SP_NOEXCEPT_WITH_ASSERT
     {
         BOOST_ASSERT( deleter_.use_count() <= 1 );
         deleter_.reset();
     }
 };
 
 } // namespace detail
 
 template<class D, class T> D * get_deleter( shared_ptr<T> const & p ) noexcept
 {
     D * d = boost::detail::basic_get_deleter<D>( p );
 
     if( d == 0 )
     {
         d = boost::detail::basic_get_local_deleter( d, p );
     }
 
     if( d == 0 )
     {
         boost::detail::esft2_deleter_wrapper *del_wrapper = boost::detail::basic_get_deleter<boost::detail::esft2_deleter_wrapper>(p);
 // The following get_deleter method call is fully qualified because
 // older versions of gcc (2.95, 3.2.3) fail to compile it when written del_wrapper->get_deleter<D>()
         if(del_wrapper) d = del_wrapper->::boost::detail::esft2_deleter_wrapper::get_deleter<D>();
     }
 
     return d;
 }
 
 // atomic access
 
 #if !defined(BOOST_SP_NO_ATOMIC_ACCESS)
 
 template<class T> inline bool atomic_is_lock_free( shared_ptr<T> const * /*p*/ ) noexcept
 {
     return false;
 }
 
 template<class T> shared_ptr<T> atomic_load( shared_ptr<T> const * p ) noexcept
 {
     boost::detail::spinlock_pool<2>::scoped_lock lock( p );
     return *p;
 }
 
 template<class T, class M> inline shared_ptr<T> atomic_load_explicit( shared_ptr<T> const * p, /*memory_order mo*/ M ) noexcept
 {
     return atomic_load( p );
 }
 
 template<class T> void atomic_store( shared_ptr<T> * p, shared_ptr<T> r ) noexcept
 {
     boost::detail::spinlock_pool<2>::scoped_lock lock( p );
     p->swap( r );
 }
 
 template<class T, class M> inline void atomic_store_explicit( shared_ptr<T> * p, shared_ptr<T> r, /*memory_order mo*/ M ) noexcept
 {
     atomic_store( p, r ); // std::move( r )
 }
 
 template<class T> shared_ptr<T> atomic_exchange( shared_ptr<T> * p, shared_ptr<T> r ) noexcept
 {
     boost::detail::spinlock & sp = boost::detail::spinlock_pool<2>::spinlock_for( p );
 
     sp.lock();
     p->swap( r );
     sp.unlock();
 
     return r; // return std::move( r )
 }
 
 template<class T, class M> shared_ptr<T> inline atomic_exchange_explicit( shared_ptr<T> * p, shared_ptr<T> r, /*memory_order mo*/ M ) noexcept
 {
     return atomic_exchange( p, r ); // std::move( r )
 }
 
 template<class T> bool atomic_compare_exchange( shared_ptr<T> * p, shared_ptr<T> * v, shared_ptr<T> w ) noexcept
 {
     boost::detail::spinlock & sp = boost::detail::spinlock_pool<2>::spinlock_for( p );
 
     sp.lock();
 
     if( p->_internal_equiv( *v ) )
     {
         p->swap( w );
 
         sp.unlock();
 
         return true;
     }
     else
     {
         shared_ptr<T> tmp( *p );
 
         sp.unlock();
 
         tmp.swap( *v );
         return false;
     }
 }
 
 template<class T, class M> inline bool atomic_compare_exchange_explicit( shared_ptr<T> * p, shared_ptr<T> * v, shared_ptr<T> w, /*memory_order success*/ M, /*memory_order failure*/ M ) noexcept
 {
     return atomic_compare_exchange( p, v, w ); // std::move( w )
 }
 
 #endif // !defined(BOOST_SP_NO_ATOMIC_ACCESS)
 
 // hash_value
 
 template< class T > struct hash;
 
 template< class T > std::size_t hash_value( boost::shared_ptr<T> const & p ) noexcept
 {
     return boost::hash< typename boost::shared_ptr<T>::element_type* >()( p.get() );
 }
 
 } // namespace boost
 
 // std::hash
 
 namespace std
 {
 
 template<class T> struct hash< ::boost::shared_ptr<T> >
 {
     std::size_t operator()( ::boost::shared_ptr<T> const & p ) const noexcept
     {
         return std::hash< typename ::boost::shared_ptr<T>::element_type* >()( p.get() );
     }
 };
 
 } // namespace std
 
 #include <boost/smart_ptr/detail/local_sp_deleter.hpp>
 
 namespace boost
 {
 
 namespace detail
 {
 
 template<class D, class T> D * basic_get_local_deleter( D *, shared_ptr<T> const & p ) noexcept
 {
     return static_cast<D *>( p._internal_get_local_deleter( BOOST_SP_TYPEID_(local_sp_deleter<D>) ) );
 }
 
 template<class D, class T> D const * basic_get_local_deleter( D const *, shared_ptr<T> const & p ) noexcept
 {
     return static_cast<D *>( p._internal_get_local_deleter( BOOST_SP_TYPEID_(local_sp_deleter<D>) ) );
 }
 
 } // namespace detail
 
 #if defined(__cpp_deduction_guides)
 
 template<class T> shared_ptr( weak_ptr<T> ) -> shared_ptr<T>;
 template<class T, class D> shared_ptr( std::unique_ptr<T, D> ) -> shared_ptr<T>;
 
 #endif
 
 } // namespace boost
 
 #if defined( BOOST_SP_DISABLE_DEPRECATED )
 #pragma GCC diagnostic pop
 #endif
 
 #endif  // #ifndef BOOST_SMART_PTR_SHARED_PTR_HPP_INCLUDED

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