#ifndef BOOST_SHARED_PTR_HPP_INCLUDED #define BOOST_SHARED_PTR_HPP_INCLUDED // // shared_ptr.hpp // // (C) Copyright Greg Colvin and Beman Dawes 1998, 1999. // Copyright (c) 2001, 2002, 2003 Peter Dimov // // Permission to copy, use, modify, sell and distribute this software // is granted provided this copyright notice appears in all copies. // This software is provided "as is" without express or implied // warranty, and with no claim as to its suitability for any purpose. // // 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/detail/shared_ptr_nmt.hpp> #else #include <boost/assert.hpp> #include <boost/checked_delete.hpp> #include <boost/throw_exception.hpp> #include <boost/detail/shared_count.hpp> #include <boost/detail/workaround.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 { 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(boost::enable_shared_from_this<T> * pe, Y * px, shared_count const & pn) { if(pe != 0) pe->_internal_weak_this._internal_assign(px, pn); } inline void sp_enable_shared_from_this(void const volatile *, void const volatile *, shared_count const &) { } } // 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, checked_deleter<Y>()) // Y must be complete { detail::sp_enable_shared_from_this(p, p, pn); } // // 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(p, p, pn); } // 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::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(tmp, tmp, pn); } #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) #if 0 private: template<class Y> friend class shared_ptr; template<class Y> friend class weak_ptr; #endif 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_HPP_INCLUDED