| #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 BOOST_DEDUCED_TYPENAME detail::shared_ptr_traits< T >::reference reference; |
| |
| shared_ptr(): px(0), pn() // never throws in 1.30+ |
| { |
| } |
| |
| #if BOOST_WORKAROUND( __BORLANDC__, BOOST_TESTED_AT( 0x564) ) |
| template<class Y> |
| explicit shared_ptr(Y * p): px(p), pn(p, boost::checked_deleter<Y>()) // Y must be complete |
| #else |
| template<class Y> |
| explicit shared_ptr(Y * p): px(p), pn(p, boost::checked_deleter<Y>()) // Y must be complete |
| #endif |
| { |
| 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(__BORLANDC__) || 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(); |
| } |
| |
| #if __GNUC__ == 2 && __GNUC_MINOR__ <= 96 |
| |
| // Resolve the ambiguity between our op!= and the one in rel_ops |
| |
| template<class T> inline bool operator!=(shared_ptr< T > const & a, shared_ptr< T > const & b) |
| { |
| return a.get() != b.get(); |
| } |
| |
| #endif |
| |
| 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<< |
| |
| #if defined(__GNUC__) && (__GNUC__ < 3) |
| |
| template<class Y> std::ostream & operator<< (std::ostream & os, shared_ptr<Y> const & p) |
| { |
| os << p.get(); |
| return os; |
| } |
| |
| #else |
| |
| # if defined(BOOST_MSVC) && BOOST_WORKAROUND(BOOST_MSVC, <= 1200 && __SGI_STL_PORT) |
| // MSVC6 has problems finding std::basic_ostream through the using declaration in namespace _STL |
| using std::basic_ostream; |
| template<class E, class T, class Y> basic_ostream<E, T> & operator<< (basic_ostream<E, T> & os, shared_ptr<Y> const & p) |
| # else |
| template<class E, class T, class Y> std::basic_ostream<E, T> & operator<< (std::basic_ostream<E, T> & os, shared_ptr<Y> const & p) |
| # endif |
| { |
| os << p.get(); |
| return os; |
| } |
| |
| #endif |
| |
| // get_deleter (experimental) |
| |
| #if (defined(__GNUC__) && (__GNUC__ < 3)) || (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 |