Chris@16: #ifndef BOOST_SHARED_PTR_132_HPP_INCLUDED
Chris@16: #define BOOST_SHARED_PTR_132_HPP_INCLUDED
Chris@16: 
Chris@16: //
Chris@16: //  shared_ptr.hpp
Chris@16: //
Chris@16: //  (C) Copyright Greg Colvin and Beman Dawes 1998, 1999.
Chris@16: //  Copyright (c) 2001, 2002, 2003 Peter Dimov
Chris@16: //
Chris@16: //  Distributed under the Boost Software License, Version 1.0. (See
Chris@16: //  accompanying file LICENSE_1_0.txt or copy at
Chris@16: //  http://www.boost.org/LICENSE_1_0.txt)
Chris@16: //
Chris@16: //  See http://www.boost.org/libs/smart_ptr/shared_ptr.htm for documentation.
Chris@16: //
Chris@16: 
Chris@16: #include <boost/config.hpp>   // for broken compiler workarounds
Chris@16: 
Chris@16: #if defined(BOOST_NO_MEMBER_TEMPLATES) && !defined(BOOST_MSVC6_MEMBER_TEMPLATES)
Chris@16: #include <boost/serialization/detail/shared_ptr_nmt_132.hpp>
Chris@16: #else
Chris@16: 
Chris@16: #include <boost/assert.hpp>
Chris@16: #include <boost/checked_delete.hpp>
Chris@16: #include <boost/serialization/throw_exception.hpp>
Chris@16: #include <boost/detail/workaround.hpp>
Chris@16: 
Chris@16: #include <boost/serialization/access.hpp>
Chris@16: #include <boost/serialization/detail/shared_count_132.hpp>
Chris@16: 
Chris@16: #include <memory>               // for std::auto_ptr
Chris@16: #include <algorithm>            // for std::swap
Chris@16: #include <functional>           // for std::less
Chris@16: #include <typeinfo>             // for std::bad_cast
Chris@16: #include <iosfwd>               // for std::basic_ostream
Chris@16: 
Chris@16: #ifdef BOOST_MSVC  // moved here to work around VC++ compiler crash
Chris@16: # pragma warning(push)
Chris@16: # pragma warning(disable:4284) // odd return type for operator->
Chris@16: #endif
Chris@16: 
Chris@16: namespace boost_132 {
Chris@16: 
Chris@16: template<class T> class weak_ptr;
Chris@16: template<class T> class enable_shared_from_this;
Chris@16: 
Chris@16: namespace detail
Chris@16: {
Chris@16: 
Chris@16: struct static_cast_tag {};
Chris@16: struct const_cast_tag {};
Chris@16: struct dynamic_cast_tag {};
Chris@16: struct polymorphic_cast_tag {};
Chris@16: 
Chris@16: template<class T> struct shared_ptr_traits
Chris@16: {
Chris@16:     typedef T & reference;
Chris@16: };
Chris@16: 
Chris@16: template<> struct shared_ptr_traits<void>
Chris@16: {
Chris@16:     typedef void reference;
Chris@16: };
Chris@16: 
Chris@16: #if !defined(BOOST_NO_CV_VOID_SPECIALIZATIONS)
Chris@16: 
Chris@16: template<> struct shared_ptr_traits<void const>
Chris@16: {
Chris@16:     typedef void reference;
Chris@16: };
Chris@16: 
Chris@16: template<> struct shared_ptr_traits<void volatile>
Chris@16: {
Chris@16:     typedef void reference;
Chris@16: };
Chris@16: 
Chris@16: template<> struct shared_ptr_traits<void const volatile>
Chris@16: {
Chris@16:     typedef void reference;
Chris@16: };
Chris@16: 
Chris@16: #endif
Chris@16: 
Chris@16: // enable_shared_from_this support
Chris@16: 
Chris@16: 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 )
Chris@16: {
Chris@16:     if(pe != 0) pe->_internal_weak_this._internal_assign(const_cast<Y*>(px), pn);
Chris@16: }
Chris@16: 
Chris@16: inline void sp_enable_shared_from_this( shared_count const & /*pn*/, ... )
Chris@16: {
Chris@16: }
Chris@16: 
Chris@16: } // namespace detail
Chris@16: 
Chris@16: 
Chris@16: //
Chris@16: //  shared_ptr
Chris@16: //
Chris@16: //  An enhanced relative of scoped_ptr with reference counted copy semantics.
Chris@16: //  The object pointed to is deleted when the last shared_ptr pointing to it
Chris@16: //  is destroyed or reset.
Chris@16: //
Chris@16: 
Chris@16: template<class T> class shared_ptr
Chris@16: {
Chris@16: private:
Chris@16:     // Borland 5.5.1 specific workaround
Chris@16:     typedef shared_ptr< T > this_type;
Chris@16: 
Chris@16: public:
Chris@16: 
Chris@16:     typedef T element_type;
Chris@16:     typedef T value_type;
Chris@16:     typedef T * pointer;
Chris@101:     typedef typename detail::shared_ptr_traits< T >::reference reference;
Chris@16: 
Chris@16:     shared_ptr(): px(0), pn() // never throws in 1.30+
Chris@16:     {
Chris@16:     }
Chris@16: 
Chris@16: #if BOOST_WORKAROUND( __BORLANDC__, BOOST_TESTED_AT( 0x564) )
Chris@16:     template<class Y>
Chris@16:     explicit shared_ptr(Y * p): px(p), pn(p, boost::checked_deleter<Y>()) // Y must be complete
Chris@16: #else
Chris@16:     template<class Y>
Chris@16:     explicit shared_ptr(Y * p): px(p), pn(p, boost::checked_deleter<Y>()) // Y must be complete
Chris@16: #endif
Chris@16:     {
Chris@16:         detail::sp_enable_shared_from_this( pn, p, p );
Chris@16:     }
Chris@16: 
Chris@16:     //
Chris@16:     // Requirements: D's copy constructor must not throw
Chris@16:     //
Chris@16:     // shared_ptr will release p by calling d(p)
Chris@16:     //
Chris@16: 
Chris@16:     template<class Y, class D> shared_ptr(Y * p, D d): px(p), pn(p, d)
Chris@16:     {
Chris@16:         detail::sp_enable_shared_from_this( pn, p, p );
Chris@16:     }
Chris@16: 
Chris@16: //  generated copy constructor, assignment, destructor are fine...
Chris@16: 
Chris@16: //  except that Borland C++ has a bug, and g++ with -Wsynth warns
Chris@16: #if defined(__BORLANDC__) || defined(__GNUC__)
Chris@16: 
Chris@16:     shared_ptr & operator=(shared_ptr const & r) // never throws
Chris@16:     {
Chris@16:         px = r.px;
Chris@16:         pn = r.pn; // shared_count::op= doesn't throw
Chris@16:         return *this;
Chris@16:     }
Chris@16: 
Chris@16: #endif
Chris@16: 
Chris@16:     template<class Y>
Chris@16:     explicit shared_ptr(weak_ptr<Y> const & r): pn(r.pn) // may throw
Chris@16:     {
Chris@16:         // it is now safe to copy r.px, as pn(r.pn) did not throw
Chris@16:         px = r.px;
Chris@16:     }
Chris@16: 
Chris@16:     template<class Y>
Chris@16:     shared_ptr(shared_ptr<Y> const & r): px(r.px), pn(r.pn) // never throws
Chris@16:     {
Chris@16:     }
Chris@16: 
Chris@16:     template<class Y>
Chris@16:     shared_ptr(shared_ptr<Y> const & r, detail::static_cast_tag): px(static_cast<element_type *>(r.px)), pn(r.pn)
Chris@16:     {
Chris@16:     }
Chris@16: 
Chris@16:     template<class Y>
Chris@16:     shared_ptr(shared_ptr<Y> const & r, detail::const_cast_tag): px(const_cast<element_type *>(r.px)), pn(r.pn)
Chris@16:     {
Chris@16:     }
Chris@16: 
Chris@16:     template<class Y>
Chris@16:     shared_ptr(shared_ptr<Y> const & r, detail::dynamic_cast_tag): px(dynamic_cast<element_type *>(r.px)), pn(r.pn)
Chris@16:     {
Chris@16:         if(px == 0) // need to allocate new counter -- the cast failed
Chris@16:         {
Chris@16:             pn = detail::shared_count();
Chris@16:         }
Chris@16:     }
Chris@16: 
Chris@16:     template<class Y>
Chris@16:     shared_ptr(shared_ptr<Y> const & r, detail::polymorphic_cast_tag): px(dynamic_cast<element_type *>(r.px)), pn(r.pn)
Chris@16:     {
Chris@16:         if(px == 0)
Chris@16:         {
Chris@16:             boost::serialization::throw_exception(std::bad_cast());
Chris@16:         }
Chris@16:     }
Chris@16: 
Chris@16: #ifndef BOOST_NO_AUTO_PTR
Chris@16: 
Chris@16:     template<class Y>
Chris@16:     explicit shared_ptr(std::auto_ptr<Y> & r): px(r.get()), pn()
Chris@16:     {
Chris@16:         Y * tmp = r.get();
Chris@16:         pn = detail::shared_count(r);
Chris@16:         detail::sp_enable_shared_from_this( pn, tmp, tmp );
Chris@16:     }
Chris@16: 
Chris@16: #endif
Chris@16: 
Chris@16: #if !defined(BOOST_MSVC) || (BOOST_MSVC > 1200)
Chris@16: 
Chris@16:     template<class Y>
Chris@16:     shared_ptr & operator=(shared_ptr<Y> const & r) // never throws
Chris@16:     {
Chris@16:         px = r.px;
Chris@16:         pn = r.pn; // shared_count::op= doesn't throw
Chris@16:         return *this;
Chris@16:     }
Chris@16: 
Chris@16: #endif
Chris@16: 
Chris@16: #ifndef BOOST_NO_AUTO_PTR
Chris@16: 
Chris@16:     template<class Y>
Chris@16:     shared_ptr & operator=(std::auto_ptr<Y> & r)
Chris@16:     {
Chris@16:         this_type(r).swap(*this);
Chris@16:         return *this;
Chris@16:     }
Chris@16: 
Chris@16: #endif
Chris@16: 
Chris@16:     void reset() // never throws in 1.30+
Chris@16:     {
Chris@16:         this_type().swap(*this);
Chris@16:     }
Chris@16: 
Chris@16:     template<class Y> void reset(Y * p) // Y must be complete
Chris@16:     {
Chris@16:         BOOST_ASSERT(p == 0 || p != px); // catch self-reset errors
Chris@16:         this_type(p).swap(*this);
Chris@16:     }
Chris@16: 
Chris@16:     template<class Y, class D> void reset(Y * p, D d)
Chris@16:     {
Chris@16:         this_type(p, d).swap(*this);
Chris@16:     }
Chris@16: 
Chris@16:     reference operator* () const // never throws
Chris@16:     {
Chris@16:         BOOST_ASSERT(px != 0);
Chris@16:         return *px;
Chris@16:     }
Chris@16: 
Chris@16:     T * operator-> () const // never throws
Chris@16:     {
Chris@16:         BOOST_ASSERT(px != 0);
Chris@16:         return px;
Chris@16:     }
Chris@16:     
Chris@16:     T * get() const // never throws
Chris@16:     {
Chris@16:         return px;
Chris@16:     }
Chris@16: 
Chris@16:     // implicit conversion to "bool"
Chris@16: 
Chris@16: #if defined(__SUNPRO_CC) && BOOST_WORKAROUND(__SUNPRO_CC, <= 0x530)
Chris@16: 
Chris@16:     operator bool () const
Chris@16:     {
Chris@16:         return px != 0;
Chris@16:     }
Chris@16: 
Chris@16: #elif defined(__MWERKS__) && BOOST_WORKAROUND(__MWERKS__, BOOST_TESTED_AT(0x3003))
Chris@16:     typedef T * (this_type::*unspecified_bool_type)() const;
Chris@16:     
Chris@16:     operator unspecified_bool_type() const // never throws
Chris@16:     {
Chris@16:         return px == 0? 0: &this_type::get;
Chris@16:     }
Chris@16: 
Chris@16: #else 
Chris@16: 
Chris@16:     typedef T * this_type::*unspecified_bool_type;
Chris@16: 
Chris@16:     operator unspecified_bool_type() const // never throws
Chris@16:     {
Chris@16:         return px == 0? 0: &this_type::px;
Chris@16:     }
Chris@16: 
Chris@16: #endif
Chris@16: 
Chris@16:     // operator! is redundant, but some compilers need it
Chris@16: 
Chris@16:     bool operator! () const // never throws
Chris@16:     {
Chris@16:         return px == 0;
Chris@16:     }
Chris@16: 
Chris@16:     bool unique() const // never throws
Chris@16:     {
Chris@16:         return pn.unique();
Chris@16:     }
Chris@16: 
Chris@16:     long use_count() const // never throws
Chris@16:     {
Chris@16:         return pn.use_count();
Chris@16:     }
Chris@16: 
Chris@16:     void swap(shared_ptr< T > & other) // never throws
Chris@16:     {
Chris@16:         std::swap(px, other.px);
Chris@16:         pn.swap(other.pn);
Chris@16:     }
Chris@16: 
Chris@16:     template<class Y> bool _internal_less(shared_ptr<Y> const & rhs) const
Chris@16:     {
Chris@16:         return pn < rhs.pn;
Chris@16:     }
Chris@16: 
Chris@16:     void * _internal_get_deleter(std::type_info const & ti) const
Chris@16:     {
Chris@16:         return pn.get_deleter(ti);
Chris@16:     }
Chris@16: 
Chris@16: // Tasteless as this may seem, making all members public allows member templates
Chris@16: // to work in the absence of member template friends. (Matthew Langston)
Chris@16: 
Chris@16: #ifndef BOOST_NO_MEMBER_TEMPLATE_FRIENDS
Chris@16: 
Chris@16: private:
Chris@16: 
Chris@16:     template<class Y> friend class shared_ptr;
Chris@16:     template<class Y> friend class weak_ptr;
Chris@16: 
Chris@16: 
Chris@16: #endif
Chris@16: public: // for serialization
Chris@16:     T * px;                     // contained pointer
Chris@16:     detail::shared_count pn;    // reference counter
Chris@16: 
Chris@16: };  // shared_ptr
Chris@16: 
Chris@16: template<class T, class U> inline bool operator==(shared_ptr< T > const & a, shared_ptr<U> const & b)
Chris@16: {
Chris@16:     return a.get() == b.get();
Chris@16: }
Chris@16: 
Chris@16: template<class T, class U> inline bool operator!=(shared_ptr< T > const & a, shared_ptr<U> const & b)
Chris@16: {
Chris@16:     return a.get() != b.get();
Chris@16: }
Chris@16: 
Chris@16: template<class T, class U> inline bool operator<(shared_ptr< T > const & a, shared_ptr<U> const & b)
Chris@16: {
Chris@16:     return a._internal_less(b);
Chris@16: }
Chris@16: 
Chris@16: template<class T> inline void swap(shared_ptr< T > & a, shared_ptr< T > & b)
Chris@16: {
Chris@16:     a.swap(b);
Chris@16: }
Chris@16: 
Chris@16: template<class T, class U> shared_ptr< T > static_pointer_cast(shared_ptr<U> const & r)
Chris@16: {
Chris@16:     return shared_ptr< T >(r, detail::static_cast_tag());
Chris@16: }
Chris@16: 
Chris@16: template<class T, class U> shared_ptr< T > const_pointer_cast(shared_ptr<U> const & r)
Chris@16: {
Chris@16:     return shared_ptr< T >(r, detail::const_cast_tag());
Chris@16: }
Chris@16: 
Chris@16: template<class T, class U> shared_ptr< T > dynamic_pointer_cast(shared_ptr<U> const & r)
Chris@16: {
Chris@16:     return shared_ptr< T >(r, detail::dynamic_cast_tag());
Chris@16: }
Chris@16: 
Chris@16: // shared_*_cast names are deprecated. Use *_pointer_cast instead.
Chris@16: 
Chris@16: template<class T, class U> shared_ptr< T > shared_static_cast(shared_ptr<U> const & r)
Chris@16: {
Chris@16:     return shared_ptr< T >(r, detail::static_cast_tag());
Chris@16: }
Chris@16: 
Chris@16: template<class T, class U> shared_ptr< T > shared_dynamic_cast(shared_ptr<U> const & r)
Chris@16: {
Chris@16:     return shared_ptr< T >(r, detail::dynamic_cast_tag());
Chris@16: }
Chris@16: 
Chris@16: template<class T, class U> shared_ptr< T > shared_polymorphic_cast(shared_ptr<U> const & r)
Chris@16: {
Chris@16:     return shared_ptr< T >(r, detail::polymorphic_cast_tag());
Chris@16: }
Chris@16: 
Chris@16: template<class T, class U> shared_ptr< T > shared_polymorphic_downcast(shared_ptr<U> const & r)
Chris@16: {
Chris@16:     BOOST_ASSERT(dynamic_cast<T *>(r.get()) == r.get());
Chris@16:     return shared_static_cast< T >(r);
Chris@16: }
Chris@16: 
Chris@16: // get_pointer() enables boost::mem_fn to recognize shared_ptr
Chris@16: 
Chris@16: template<class T> inline T * get_pointer(shared_ptr< T > const & p)
Chris@16: {
Chris@16:     return p.get();
Chris@16: }
Chris@16: 
Chris@16: // operator<<
Chris@16: 
Chris@16: 
Chris@101: template<class E, class T, class Y> std::basic_ostream<E, T> & operator<< (std::basic_ostream<E, T> & os, shared_ptr<Y> const & p)
Chris@16: {
Chris@16:     os << p.get();
Chris@16:     return os;
Chris@16: }
Chris@16: 
Chris@16: // get_deleter (experimental)
Chris@16: 
Chris@101: #if defined(__EDG_VERSION__) && (__EDG_VERSION__ <= 238)
Chris@16: 
Chris@16: // g++ 2.9x doesn't allow static_cast<X const *>(void *)
Chris@16: // apparently EDG 2.38 also doesn't accept it
Chris@16: 
Chris@16: template<class D, class T> D * get_deleter(shared_ptr< T > const & p)
Chris@16: {
Chris@16:     void const * q = p._internal_get_deleter(typeid(D));
Chris@16:     return const_cast<D *>(static_cast<D const *>(q));
Chris@16: }
Chris@16: 
Chris@16: #else
Chris@16: 
Chris@16: template<class D, class T> D * get_deleter(shared_ptr< T > const & p)
Chris@16: {
Chris@16:     return static_cast<D *>(p._internal_get_deleter(typeid(D)));
Chris@16: }
Chris@16: 
Chris@16: #endif
Chris@16: 
Chris@16: } // namespace boost
Chris@16: 
Chris@16: #ifdef BOOST_MSVC
Chris@16: # pragma warning(pop)
Chris@16: #endif    
Chris@16: 
Chris@16: #endif  // #if defined(BOOST_NO_MEMBER_TEMPLATES) && !defined(BOOST_MSVC6_MEMBER_TEMPLATES)
Chris@16: 
Chris@16: #endif  // #ifndef BOOST_SHARED_PTR_132_HPP_INCLUDED