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 #ifndef BOOST_SHARED_PTR_132_HPP_INCLUDED
 #define BOOST_SHARED_PTR_132_HPP_INCLUDED
 
 //
 //  shared_ptr.hpp
 //
 //  (C) Copyright Greg Colvin and Beman Dawes 1998, 1999.
 //  Copyright (c) 2001, 2002, 2003 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/shared_ptr.htm for documentation.
 //
 
 #include <boost/config.hpp>   // for broken compiler workarounds
 
 #if defined(BOOST_NO_MEMBER_TEMPLATES) && !defined(BOOST_MSVC6_MEMBER_TEMPLATES)
 #include <boost/serialization/detail/shared_ptr_nmt_132.hpp>
 #else
 
 #include <boost/assert.hpp>
 #include <boost/checked_delete.hpp>
 #include <boost/serialization/throw_exception.hpp>
 #include <boost/detail/workaround.hpp>
 
 #include <boost/serialization/access.hpp>
 #include <boost/serialization/detail/shared_count_132.hpp>
 
 #include <memory>               // for std::auto_ptr
 #include <algorithm>            // for std::swap
 #include <functional>           // for std::less
 #include <typeinfo>             // for std::bad_cast
 #include <iosfwd>               // for std::basic_ostream
 
 #ifdef BOOST_MSVC  // moved here to work around VC++ compiler crash
 # pragma warning(push)
 # pragma warning(disable:4284) // odd return type for operator->
 #endif
 
 namespace boost_132 {
 
 template<class T> class weak_ptr;
 template<class T> class enable_shared_from_this;
 
 namespace detail
 {
 
 struct static_cast_tag {};
 struct const_cast_tag {};
 struct dynamic_cast_tag {};
 struct polymorphic_cast_tag {};
 
 template<class T> struct shared_ptr_traits
 {
     typedef T & reference;
 };
 
 template<> struct shared_ptr_traits<void>
 {
     typedef void reference;
 };
 
 #if !defined(BOOST_NO_CV_VOID_SPECIALIZATIONS)
 
 template<> struct shared_ptr_traits<void const>
 {
     typedef void reference;
 };
 
 template<> struct shared_ptr_traits<void volatile>
 {
     typedef void reference;
 };
 
 template<> struct shared_ptr_traits<void const volatile>
 {
     typedef void reference;
 };
 
 #endif
 
 // enable_shared_from_this support
 
 template<class T, class Y> void sp_enable_shared_from_this( shared_count const & pn, enable_shared_from_this< T > const * pe, Y const * px )
 {
     if(pe != 0) pe->_internal_weak_this._internal_assign(const_cast<Y*>(px), pn);
 }
 
 inline void sp_enable_shared_from_this( shared_count const & /*pn*/, ... )
 {
 }
 
 } // 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 T element_type;
     typedef T value_type;
     typedef T * pointer;
     typedef typename detail::shared_ptr_traits< T >::reference reference;
 
     shared_ptr(): px(0), pn() // never throws in 1.30+
     {
     }
 
     template<class Y>
     explicit shared_ptr(Y * p): px(p), pn(p, boost::checked_deleter<Y>()) // Y must be complete
     {
         detail::sp_enable_shared_from_this( pn, p, p );
     }
 
     //
     // Requirements: D's copy constructor 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, d)
     {
         detail::sp_enable_shared_from_this( pn, p, p );
     }
 
 //  generated copy constructor, assignment, destructor are fine...
 
 //  except that Borland C++ has a bug, and g++ with -Wsynth warns
 #if defined(__GNUC__)
     shared_ptr & operator=(shared_ptr const & r) // never throws
     {
         px = r.px;
         pn = r.pn; // shared_count::op= doesn't throw
         return *this;
     }
 #endif
 
     template<class Y>
     explicit shared_ptr(weak_ptr<Y> const & r): pn(r.pn) // may throw
     {
         // it is now safe to copy r.px, as pn(r.pn) did not throw
         px = r.px;
     }
 
     template<class Y>
     shared_ptr(shared_ptr<Y> const & r): px(r.px), pn(r.pn) // never throws
     {
     }
 
     template<class Y>
     shared_ptr(shared_ptr<Y> const & r, detail::static_cast_tag): px(static_cast<element_type *>(r.px)), pn(r.pn)
     {
     }
 
     template<class Y>
     shared_ptr(shared_ptr<Y> const & r, detail::const_cast_tag): px(const_cast<element_type *>(r.px)), pn(r.pn)
     {
     }
 
     template<class Y>
     shared_ptr(shared_ptr<Y> const & r, detail::dynamic_cast_tag): px(dynamic_cast<element_type *>(r.px)), pn(r.pn)
     {
         if(px == 0) // need to allocate new counter -- the cast failed
         {
             pn = detail::shared_count();
         }
     }
 
     template<class Y>
     shared_ptr(shared_ptr<Y> const & r, detail::polymorphic_cast_tag): px(dynamic_cast<element_type *>(r.px)), pn(r.pn)
     {
         if(px == 0)
         {
             boost::serialization::throw_exception(std::bad_cast());
         }
     }
 
 #ifndef BOOST_NO_AUTO_PTR
 
     template<class Y>
     explicit shared_ptr(std::auto_ptr<Y> & r): px(r.get()), pn()
     {
         Y * tmp = r.get();
         pn = detail::shared_count(r);
         detail::sp_enable_shared_from_this( pn, tmp, tmp );
     }
 
 #endif
 
 #if !defined(BOOST_MSVC) || (BOOST_MSVC > 1200)
 
     template<class Y>
     shared_ptr & operator=(shared_ptr<Y> const & r) // never throws
     {
         px = r.px;
         pn = r.pn; // shared_count::op= doesn't throw
         return *this;
     }
 
 #endif
 
 #ifndef BOOST_NO_AUTO_PTR
 
     template<class Y>
     shared_ptr & operator=(std::auto_ptr<Y> & r)
     {
         this_type(r).swap(*this);
         return *this;
     }
 
 #endif
 
     void reset() // never throws in 1.30+
     {
         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, d).swap(*this);
     }
 
     reference operator* () const // never throws
     {
         BOOST_ASSERT(px != 0);
         return *px;
     }
 
     T * operator-> () const // never throws
     {
         BOOST_ASSERT(px != 0);
         return px;
     }
 
     T * get() const // never throws
     {
         return px;
     }
 
     // implicit conversion to "bool"
 
 #if defined(__SUNPRO_CC) && BOOST_WORKAROUND(__SUNPRO_CC, <= 0x530)
 
     operator bool () const
     {
         return px != 0;
     }
 
 #elif defined(__MWERKS__) && BOOST_WORKAROUND(__MWERKS__, BOOST_TESTED_AT(0x3003))
     typedef T * (this_type::*unspecified_bool_type)() const;
 
     operator unspecified_bool_type() const // never throws
     {
         return px == 0? 0: &this_type::get;
     }
 
 #else
 
     typedef T * this_type::*unspecified_bool_type;
 
     operator unspecified_bool_type() const // never throws
     {
         return px == 0? 0: &this_type::px;
     }
 
 #endif
 
     // operator! is redundant, but some compilers need it
 
     bool operator! () const // never throws
     {
         return px == 0;
     }
 
     bool unique() const // never throws
     {
         return pn.unique();
     }
 
     long use_count() const // never throws
     {
         return pn.use_count();
     }
 
     void swap(shared_ptr< T > & other) // never throws
     {
         std::swap(px, other.px);
         pn.swap(other.pn);
     }
 
     template<class Y> bool _internal_less(shared_ptr<Y> const & rhs) const
     {
         return pn < rhs.pn;
     }
 
     void * _internal_get_deleter(std::type_info const & ti) const
     {
         return pn.get_deleter(ti);
     }
 
 // Tasteless as this may seem, making all members public allows member templates
 // to work in the absence of member template friends. (Matthew Langston)
 
 #ifndef BOOST_NO_MEMBER_TEMPLATE_FRIENDS
 
 private:
 
     template<class Y> friend class shared_ptr;
     template<class Y> friend class weak_ptr;
 
 
 #endif
 public: // for serialization
     T * px;                     // contained pointer
     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)
 {
     return a.get() == b.get();
 }
 
 template<class T, class U> inline bool operator!=(shared_ptr< T > const & a, shared_ptr<U> const & b)
 {
     return a.get() != b.get();
 }
 
 template<class T, class U> inline bool operator<(shared_ptr< T > const & a, shared_ptr<U> const & b)
 {
     return a._internal_less(b);
 }
 
 template<class T> inline void swap(shared_ptr< T > & a, shared_ptr< T > & b)
 {
     a.swap(b);
 }
 
 template<class T, class U> shared_ptr< T > static_pointer_cast(shared_ptr<U> const & r)
 {
     return shared_ptr< T >(r, detail::static_cast_tag());
 }
 
 template<class T, class U> shared_ptr< T > const_pointer_cast(shared_ptr<U> const & r)
 {
     return shared_ptr< T >(r, detail::const_cast_tag());
 }
 
 template<class T, class U> shared_ptr< T > dynamic_pointer_cast(shared_ptr<U> const & r)
 {
     return shared_ptr< T >(r, detail::dynamic_cast_tag());
 }
 
 // shared_*_cast names are deprecated. Use *_pointer_cast instead.
 
 template<class T, class U> shared_ptr< T > shared_static_cast(shared_ptr<U> const & r)
 {
     return shared_ptr< T >(r, detail::static_cast_tag());
 }
 
 template<class T, class U> shared_ptr< T > shared_dynamic_cast(shared_ptr<U> const & r)
 {
     return shared_ptr< T >(r, detail::dynamic_cast_tag());
 }
 
 template<class T, class U> shared_ptr< T > shared_polymorphic_cast(shared_ptr<U> const & r)
 {
     return shared_ptr< T >(r, detail::polymorphic_cast_tag());
 }
 
 template<class T, class U> shared_ptr< T > shared_polymorphic_downcast(shared_ptr<U> const & r)
 {
     BOOST_ASSERT(dynamic_cast<T *>(r.get()) == r.get());
     return shared_static_cast< T >(r);
 }
 
 // get_pointer() enables boost::mem_fn to recognize shared_ptr
 
 template<class T> inline T * get_pointer(shared_ptr< T > const & p)
 {
     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 (experimental)
 
 #if defined(__EDG_VERSION__) && (__EDG_VERSION__ <= 238)
 
 // g++ 2.9x doesn't allow static_cast<X const *>(void *)
 // apparently EDG 2.38 also doesn't accept it
 
 template<class D, class T> D * get_deleter(shared_ptr< T > const & p)
 {
     void const * q = p._internal_get_deleter(typeid(D));
     return const_cast<D *>(static_cast<D const *>(q));
 }
 
 #else
 
 template<class D, class T> D * get_deleter(shared_ptr< T > const & p)
 {
     return static_cast<D *>(p._internal_get_deleter(typeid(D)));
 }
 
 #endif
 
 } // namespace boost
 
 #ifdef BOOST_MSVC
 # pragma warning(pop)
 #endif
 
 #endif  // #if defined(BOOST_NO_MEMBER_TEMPLATES) && !defined(BOOST_MSVC6_MEMBER_TEMPLATES)
 
 #endif  // #ifndef BOOST_SHARED_PTR_132_HPP_INCLUDED

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