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+#ifndef BOOST_SIGNALS2_DECONSTRUCT_HPP
+#define BOOST_SIGNALS2_DECONSTRUCT_HPP
+
+//  deconstruct.hpp
+//
+// A factory function for creating a shared_ptr which creates
+// an object and its owning shared_ptr with one allocation, similar
+// to make_shared<T>().  It also supports postconstructors
+// and predestructors through unqualified calls of adl_postconstruct() and
+// adl_predestruct, relying on argument-dependent
+// lookup to find the appropriate postconstructor or predestructor.
+// Passing arguments to postconstructors is also supported.
+//
+//  based on make_shared.hpp and make_shared_access patch from Michael Marcin
+//
+//  Copyright (c) 2007, 2008 Peter Dimov
+//  Copyright (c) 2008 Michael Marcin
+//  Copyright (c) 2009 Frank Mori Hess
+//
+//  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
+//  for more information
+
+#include <boost/config.hpp>
+#include <boost/shared_ptr.hpp>
+#include <boost/signals2/deconstruct_ptr.hpp>
+#include <boost/type_traits/alignment_of.hpp>
+#include <boost/type_traits/remove_const.hpp>
+#include <boost/type_traits/type_with_alignment.hpp>
+#include <cstddef>
+#include <new>
+
+namespace boost
+{
+  template<typename T> class enable_shared_from_this;
+
+namespace signals2
+{
+  class deconstruct_access;
+
+namespace detail
+{
+  inline void adl_predestruct(...) {}
+} // namespace detail
+
+template<typename T>
+    class postconstructor_invoker
+{
+public:
+    operator const shared_ptr<T> & () const
+    {
+        return postconstruct();
+    }
+    const shared_ptr<T>& postconstruct() const
+    {
+        if(!_postconstructed)
+        {
+            adl_postconstruct(_sp, const_cast<typename boost::remove_const<T>::type *>(_sp.get()));
+            _postconstructed = true;
+        }
+        return _sp;
+    }
+#if !defined(BOOST_NO_CXX11_VARIADIC_TEMPLATES) && !defined(BOOST_NO_CXX11_RVALUE_REFERENCES)
+    template<class... Args>
+      const shared_ptr<T>& postconstruct(Args && ... args)
+    {
+        if(!_postconstructed)
+        {
+            adl_postconstruct(_sp, const_cast<typename boost::remove_const<T>::type *>(_sp.get()),
+                std::forward<Args>(args)...);
+            _postconstructed = true;
+        }
+        return _sp;
+    }
+#else // !defined(BOOST_NO_CXX11_VARIADIC_TEMPLATES) && !defined(BOOST_NO_CXX11_RVALUE_REFERENCES)
+    template<typename A1>
+      const shared_ptr<T>& postconstruct(const A1 &a1) const
+    {
+        if(!_postconstructed)
+        {
+            adl_postconstruct(_sp, const_cast<typename boost::remove_const<T>::type *>(_sp.get()),
+                a1);
+            _postconstructed = true;
+        }
+        return _sp;
+    }
+    template<typename A1, typename A2>
+      const shared_ptr<T>& postconstruct(const A1 &a1, const A2 &a2) const
+    {
+        if(!_postconstructed)
+        {
+            adl_postconstruct(_sp, const_cast<typename boost::remove_const<T>::type *>(_sp.get()),
+                a1, a2);
+            _postconstructed = true;
+        }
+        return _sp;
+    }
+    template<typename A1, typename A2, typename A3>
+      const shared_ptr<T>& postconstruct(const A1 &a1, const A2 &a2, const A3 &a3) const
+    {
+        if(!_postconstructed)
+        {
+            adl_postconstruct(_sp, const_cast<typename boost::remove_const<T>::type *>(_sp.get()),
+                a1, a2, a3);
+            _postconstructed = true;
+        }
+        return _sp;
+    }
+    template<typename A1, typename A2, typename A3, typename A4>
+      const shared_ptr<T>& postconstruct(const A1 &a1, const A2 &a2, const A3 &a3, const A4 &a4) const
+    {
+        if(!_postconstructed)
+        {
+            adl_postconstruct(_sp, const_cast<typename boost::remove_const<T>::type *>(_sp.get()),
+                a1, a2, a3, a4);
+            _postconstructed = true;
+        }
+        return _sp;
+    }
+    template<typename A1, typename A2, typename A3, typename A4, typename A5>
+      const shared_ptr<T>& postconstruct(const A1 &a1, const A2 &a2, const A3 &a3, const A4 &a4, const A5 &a5) const
+    {
+        if(!_postconstructed)
+        {
+            adl_postconstruct(_sp, const_cast<typename boost::remove_const<T>::type *>(_sp.get()),
+                a1, a2, a3, a4, a5);
+            _postconstructed = true;
+        }
+        return _sp;
+    }
+    template<typename A1, typename A2, typename A3, typename A4, typename A5,
+      typename A6>
+      const shared_ptr<T>& postconstruct(const A1 &a1, const A2 &a2, const A3 &a3, const A4 &a4, const A5 &a5,
+      const A6 &a6) const
+    {
+        if(!_postconstructed)
+        {
+            adl_postconstruct(_sp, const_cast<typename boost::remove_const<T>::type *>(_sp.get()),
+                a1, a2, a3, a4, a5, a6);
+            _postconstructed = true;
+        }
+        return _sp;
+    }
+    template<typename A1, typename A2, typename A3, typename A4, typename A5,
+      typename A6, typename A7>
+      const shared_ptr<T>& postconstruct(const A1 &a1, const A2 &a2, const A3 &a3, const A4 &a4, const A5 &a5,
+      const A6 &a6, const A7 &a7) const
+    {
+        if(!_postconstructed)
+        {
+            adl_postconstruct(_sp, const_cast<typename boost::remove_const<T>::type *>(_sp.get()),
+                a1, a2, a3, a4, a5, a6, a7);
+            _postconstructed = true;
+        }
+        return _sp;
+    }
+    template<typename A1, typename A2, typename A3, typename A4, typename A5,
+      typename A6, typename A7, typename A8>
+      const shared_ptr<T>& postconstruct(const A1 &a1, const A2 &a2, const A3 &a3, const A4 &a4, const A5 &a5,
+      const A6 &a6, const A7 &a7, const A8 &a8) const
+    {
+        if(!_postconstructed)
+        {
+            adl_postconstruct(_sp, const_cast<typename boost::remove_const<T>::type *>(_sp.get()),
+                a1, a2, a3, a4, a5, a6, a7, a8);
+            _postconstructed = true;
+        }
+        return _sp;
+    }
+    template<typename A1, typename A2, typename A3, typename A4, typename A5,
+      typename A6, typename A7, typename A8, typename A9>
+      const shared_ptr<T>& postconstruct(const A1 &a1, const A2 &a2, const A3 &a3, const A4 &a4, const A5 &a5,
+      const A6 &a6, const A7 &a7, const A8 &a8, const A9 &a9) const
+    {
+        if(!_postconstructed)
+        {
+            adl_postconstruct(_sp, const_cast<typename boost::remove_const<T>::type *>(_sp.get()),
+                a1, a2, a3, a4, a5, a6, a7, a8, a9);
+            _postconstructed = true;
+        }
+        return _sp;
+    }
+#endif // !defined(BOOST_NO_CXX11_VARIADIC_TEMPLATES) && !defined(BOOST_NO_CXX11_RVALUE_REFERENCES)
+private:
+    friend class boost::signals2::deconstruct_access;
+    postconstructor_invoker(const shared_ptr<T> & sp):
+        _sp(sp), _postconstructed(false)
+    {}
+    shared_ptr<T> _sp;
+    mutable bool _postconstructed;
+};
+
+namespace detail
+{
+
+template< std::size_t N, std::size_t A > struct sp_aligned_storage
+{
+    union type
+    {
+        char data_[ N ];
+        typename boost::type_with_alignment< A >::type align_;
+    };
+};
+
+template< class T > class deconstruct_deleter
+{
+private:
+
+    typedef typename sp_aligned_storage< sizeof( T ), ::boost::alignment_of< T >::value >::type storage_type;
+
+    bool initialized_;
+    storage_type storage_;
+
+private:
+
+    void destroy()
+    {
+        if( initialized_ )
+        {
+            T* p = reinterpret_cast< T* >( storage_.data_ );
+            using boost::signals2::detail::adl_predestruct;
+            adl_predestruct(const_cast<typename boost::remove_const<T>::type *>(p));
+            p->~T();
+            initialized_ = false;
+        }
+    }
+
+public:
+
+    deconstruct_deleter(): initialized_( false )
+    {
+    }
+
+    // this copy constructor is an optimization: we don't need to copy the storage_ member,
+    // and shouldn't be copying anyways after initialized_ becomes true
+    deconstruct_deleter(const deconstruct_deleter &): initialized_( false )
+    {
+    }
+
+    ~deconstruct_deleter()
+    {
+        destroy();
+    }
+
+    void operator()( T * )
+    {
+        destroy();
+    }
+
+    void * address()
+    {
+        return storage_.data_;
+    }
+
+    void set_initialized()
+    {
+        initialized_ = true;
+    }
+};
+}  // namespace detail
+
+class deconstruct_access
+{
+public:
+
+    template< class T >
+    static postconstructor_invoker<T> deconstruct()
+    {
+        boost::shared_ptr< T > pt( static_cast< T* >( 0 ), detail::deconstruct_deleter< T >() );
+
+        detail::deconstruct_deleter< T > * pd = boost::get_deleter< detail::deconstruct_deleter< T > >( pt );
+
+        void * pv = pd->address();
+
+        new( pv ) T();
+        pd->set_initialized();
+
+        boost::shared_ptr< T > retval( pt, static_cast< T* >( pv ) );
+        boost::detail::sp_enable_shared_from_this(&retval, retval.get(), retval.get());
+        return retval;
+
+    }
+
+#if !defined(BOOST_NO_CXX11_VARIADIC_TEMPLATES) && !defined(BOOST_NO_CXX11_RVALUE_REFERENCES)
+
+    // Variadic templates, rvalue reference
+
+    template< class T, class... Args >
+    static postconstructor_invoker<T> deconstruct( Args && ... args )
+    {
+        boost::shared_ptr< T > pt( static_cast< T* >( 0 ), detail::deconstruct_deleter< T >() );
+
+        detail::deconstruct_deleter< T > * pd = boost::get_deleter< detail::deconstruct_deleter< T > >( pt );
+
+        void * pv = pd->address();
+
+        new( pv ) T( std::forward<Args>( args )... );
+        pd->set_initialized();
+
+        boost::shared_ptr< T > retval( pt, static_cast< T* >( pv ) );
+        boost::detail::sp_enable_shared_from_this(&retval, retval.get(), retval.get());
+        return retval;
+    }
+
+#else
+
+    template< class T, class A1 >
+    static postconstructor_invoker<T> deconstruct( A1 const & a1 )
+    {
+        boost::shared_ptr< T > pt( static_cast< T* >( 0 ), detail::deconstruct_deleter< T >() );
+
+        detail::deconstruct_deleter< T > * pd = boost::get_deleter< detail::deconstruct_deleter< T > >( pt );
+
+        void * pv = pd->address();
+
+        new( pv ) T( a1 );
+        pd->set_initialized();
+
+        boost::shared_ptr< T > retval( pt, static_cast< T* >( pv ) );
+        boost::detail::sp_enable_shared_from_this(&retval, retval.get(), retval.get());
+        return retval;
+    }
+
+    template< class T, class A1, class A2 >
+    static postconstructor_invoker<T> deconstruct( A1 const & a1, A2 const & a2 )
+    {
+        boost::shared_ptr< T > pt( static_cast< T* >( 0 ), detail::deconstruct_deleter< T >() );
+
+        detail::deconstruct_deleter< T > * pd = boost::get_deleter< detail::deconstruct_deleter< T > >( pt );
+
+        void * pv = pd->address();
+
+        new( pv ) T( a1, a2 );
+        pd->set_initialized();
+
+        boost::shared_ptr< T > retval( pt, static_cast< T* >( pv ) );
+        boost::detail::sp_enable_shared_from_this(&retval, retval.get(), retval.get());
+        return retval;
+    }
+
+    template< class T, class A1, class A2, class A3 >
+    static postconstructor_invoker<T> deconstruct( A1 const & a1, A2 const & a2, A3 const & a3 )
+    {
+        boost::shared_ptr< T > pt( static_cast< T* >( 0 ), detail::deconstruct_deleter< T >() );
+
+        detail::deconstruct_deleter< T > * pd = boost::get_deleter< detail::deconstruct_deleter< T > >( pt );
+
+        void * pv = pd->address();
+
+        new( pv ) T( a1, a2, a3 );
+        pd->set_initialized();
+
+        boost::shared_ptr< T > retval( pt, static_cast< T* >( pv ) );
+        boost::detail::sp_enable_shared_from_this(&retval, retval.get(), retval.get());
+        return retval;
+    }
+
+    template< class T, class A1, class A2, class A3, class A4 >
+    static postconstructor_invoker<T> deconstruct( A1 const & a1, A2 const & a2, A3 const & a3, A4 const & a4 )
+    {
+        boost::shared_ptr< T > pt( static_cast< T* >( 0 ), detail::deconstruct_deleter< T >() );
+
+        detail::deconstruct_deleter< T > * pd = boost::get_deleter< detail::deconstruct_deleter< T > >( pt );
+
+        void * pv = pd->address();
+
+        new( pv ) T( a1, a2, a3, a4 );
+        pd->set_initialized();
+
+        boost::shared_ptr< T > retval( pt, static_cast< T* >( pv ) );
+        boost::detail::sp_enable_shared_from_this(&retval, retval.get(), retval.get());
+        return retval;
+    }
+
+    template< class T, class A1, class A2, class A3, class A4, class A5 >
+    static postconstructor_invoker<T> deconstruct( A1 const & a1, A2 const & a2, A3 const & a3, A4 const & a4, A5 const & a5 )
+    {
+        boost::shared_ptr< T > pt( static_cast< T* >( 0 ), detail::deconstruct_deleter< T >() );
+
+        detail::deconstruct_deleter< T > * pd = boost::get_deleter< detail::deconstruct_deleter< T > >( pt );
+
+        void * pv = pd->address();
+
+        new( pv ) T( a1, a2, a3, a4, a5 );
+        pd->set_initialized();
+
+        boost::shared_ptr< T > retval( pt, static_cast< T* >( pv ) );
+        boost::detail::sp_enable_shared_from_this(&retval, retval.get(), retval.get());
+        return retval;
+    }
+
+    template< class T, class A1, class A2, class A3, class A4, class A5, class A6 >
+    static postconstructor_invoker<T> deconstruct( A1 const & a1, A2 const & a2, A3 const & a3, A4 const & a4, A5 const & a5, A6 const & a6 )
+    {
+        boost::shared_ptr< T > pt( static_cast< T* >( 0 ), detail::deconstruct_deleter< T >() );
+
+        detail::deconstruct_deleter< T > * pd = boost::get_deleter< detail::deconstruct_deleter< T > >( pt );
+
+        void * pv = pd->address();
+
+        new( pv ) T( a1, a2, a3, a4, a5, a6 );
+        pd->set_initialized();
+
+        boost::shared_ptr< T > retval( pt, static_cast< T* >( pv ) );
+        boost::detail::sp_enable_shared_from_this(&retval, retval.get(), retval.get());
+        return retval;
+    }
+
+    template< class T, class A1, class A2, class A3, class A4, class A5, class A6, class A7 >
+    static postconstructor_invoker<T> deconstruct( A1 const & a1, A2 const & a2, A3 const & a3, A4 const & a4, A5 const & a5, A6 const & a6, A7 const & a7 )
+    {
+        boost::shared_ptr< T > pt( static_cast< T* >( 0 ), detail::deconstruct_deleter< T >() );
+
+        detail::deconstruct_deleter< T > * pd = boost::get_deleter< detail::deconstruct_deleter< T > >( pt );
+
+        void * pv = pd->address();
+
+        new( pv ) T( a1, a2, a3, a4, a5, a6, a7 );
+        pd->set_initialized();
+
+        boost::shared_ptr< T > retval( pt, static_cast< T* >( pv ) );
+        boost::detail::sp_enable_shared_from_this(&retval, retval.get(), retval.get());
+        return retval;
+    }
+
+    template< class T, class A1, class A2, class A3, class A4, class A5, class A6, class A7, class A8 >
+    static postconstructor_invoker<T> deconstruct( A1 const & a1, A2 const & a2, A3 const & a3, A4 const & a4, A5 const & a5, A6 const & a6, A7 const & a7, A8 const & a8 )
+    {
+        boost::shared_ptr< T > pt( static_cast< T* >( 0 ), detail::deconstruct_deleter< T >() );
+
+        detail::deconstruct_deleter< T > * pd = boost::get_deleter< detail::deconstruct_deleter< T > >( pt );
+
+        void * pv = pd->address();
+
+        new( pv ) T( a1, a2, a3, a4, a5, a6, a7, a8 );
+        pd->set_initialized();
+
+        boost::shared_ptr< T > retval( pt, static_cast< T* >( pv ) );
+        boost::detail::sp_enable_shared_from_this(&retval, retval.get(), retval.get());
+        return retval;
+    }
+
+    template< class T, class A1, class A2, class A3, class A4, class A5, class A6, class A7, class A8, class A9 >
+    static postconstructor_invoker<T> deconstruct( A1 const & a1, A2 const & a2, A3 const & a3, A4 const & a4, A5 const & a5, A6 const & a6, A7 const & a7, A8 const & a8, A9 const & a9 )
+    {
+        boost::shared_ptr< T > pt( static_cast< T* >( 0 ), detail::deconstruct_deleter< T >() );
+
+        detail::deconstruct_deleter< T > * pd = boost::get_deleter< detail::deconstruct_deleter< T > >( pt );
+
+        void * pv = pd->address();
+
+        new( pv ) T( a1, a2, a3, a4, a5, a6, a7, a8, a9 );
+        pd->set_initialized();
+
+        boost::shared_ptr< T > retval( pt, static_cast< T* >( pv ) );
+        boost::detail::sp_enable_shared_from_this(&retval, retval.get(), retval.get());
+        return retval;
+    }
+
+#endif
+};
+
+// Zero-argument versions
+//
+// Used even when variadic templates are available because of the new T() vs new T issue
+
+template< class T > postconstructor_invoker<T> deconstruct()
+{
+    return deconstruct_access::deconstruct<T>();
+}
+
+#if !defined(BOOST_NO_CXX11_VARIADIC_TEMPLATES) && !defined(BOOST_NO_CXX11_RVALUE_REFERENCES)
+
+// Variadic templates, rvalue reference
+
+template< class T, class... Args > postconstructor_invoker< T > deconstruct( Args && ... args )
+{
+    return deconstruct_access::deconstruct<T>( std::forward<Args>( args )... );
+}
+
+#else
+
+// C++03 version
+
+template< class T, class A1 >
+postconstructor_invoker<T> deconstruct( A1 const & a1 )
+{
+    return deconstruct_access::deconstruct<T>(a1);
+}
+
+template< class T, class A1, class A2 >
+postconstructor_invoker<T> deconstruct( A1 const & a1, A2 const & a2 )
+{
+    return deconstruct_access::deconstruct<T>(a1,a2);
+}
+
+template< class T, class A1, class A2, class A3 >
+postconstructor_invoker<T> deconstruct( A1 const & a1, A2 const & a2, A3 const & a3 )
+{
+    return deconstruct_access::deconstruct<T>(a1,a2,a3);
+}
+
+template< class T, class A1, class A2, class A3, class A4 >
+postconstructor_invoker<T> deconstruct( A1 const & a1, A2 const & a2, A3 const & a3, A4 const & a4 )
+{
+    return deconstruct_access::deconstruct<T>(a1,a2,a3,a4);
+}
+
+template< class T, class A1, class A2, class A3, class A4, class A5 >
+postconstructor_invoker<T> deconstruct( A1 const & a1, A2 const & a2, A3 const & a3, A4 const & a4, A5 const & a5 )
+{
+    return deconstruct_access::deconstruct<T>(a1,a2,a3,a4,a5);
+}
+
+template< class T, class A1, class A2, class A3, class A4, class A5, class A6 >
+postconstructor_invoker<T> deconstruct( A1 const & a1, A2 const & a2, A3 const & a3, A4 const & a4, A5 const & a5, A6 const & a6 )
+{
+    return deconstruct_access::deconstruct<T>(a1,a2,a3,a4,a5,a6);
+}
+
+template< class T, class A1, class A2, class A3, class A4, class A5, class A6, class A7 >
+postconstructor_invoker<T> deconstruct( A1 const & a1, A2 const & a2, A3 const & a3, A4 const & a4, A5 const & a5, A6 const & a6, A7 const & a7 )
+{
+    return deconstruct_access::deconstruct<T>(a1,a2,a3,a4,a5,a6,a7);
+}
+
+template< class T, class A1, class A2, class A3, class A4, class A5, class A6, class A7, class A8 >
+postconstructor_invoker<T> deconstruct( A1 const & a1, A2 const & a2, A3 const & a3, A4 const & a4, A5 const & a5, A6 const & a6, A7 const & a7, A8 const & a8 )
+{
+    return deconstruct_access::deconstruct<T>(a1,a2,a3,a4,a5,a6,a7,a8);
+}
+
+template< class T, class A1, class A2, class A3, class A4, class A5, class A6, class A7, class A8, class A9 >
+postconstructor_invoker<T> deconstruct( A1 const & a1, A2 const & a2, A3 const & a3, A4 const & a4, A5 const & a5, A6 const & a6, A7 const & a7, A8 const & a8, A9 const & a9 )
+{
+    return deconstruct_access::deconstruct<T>(a1,a2,a3,a4,a5,a6,a7,a8,a9);
+}
+
+#endif
+
+} // namespace signals2
+} // namespace boost
+
+#endif // #ifndef BOOST_SIGNALS2_DECONSTRUCT_HPP