#ifndef BOOST_SMART_PTR_INTRUSIVE_PTR_HPP_INCLUDED #define BOOST_SMART_PTR_INTRUSIVE_PTR_HPP_INCLUDED // // intrusive_ptr.hpp // // Copyright (c) 2001, 2002 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/intrusive_ptr.html for documentation. // #include <boost/config.hpp> #ifdef BOOST_MSVC // moved here to work around VC++ compiler crash # pragma warning(push) # pragma warning(disable:4284) // odd return type for operator-> #endif #include <boost/assert.hpp> #include <boost/detail/workaround.hpp> #include <boost/smart_ptr/detail/sp_convertible.hpp> #include <boost/config/no_tr1/functional.hpp> // for std::less #if !defined(BOOST_NO_IOSTREAM) #if !defined(BOOST_NO_IOSFWD) #include <iosfwd> // for std::basic_ostream #else #include <ostream> #endif #endif namespace boost { // // intrusive_ptr // // A smart pointer that uses intrusive reference counting. // // Relies on unqualified calls to // // void intrusive_ptr_add_ref(T * p); // void intrusive_ptr_release(T * p); // // (p != 0) // // The object is responsible for destroying itself. // template<class T> class intrusive_ptr { private: typedef intrusive_ptr this_type; public: typedef T element_type; intrusive_ptr(): px( 0 ) { } intrusive_ptr( T * p, bool add_ref = true ): px( p ) { if( px != 0 && add_ref ) intrusive_ptr_add_ref( px ); } #if !defined(BOOST_NO_MEMBER_TEMPLATES) || defined(BOOST_MSVC6_MEMBER_TEMPLATES) template<class U> #if !defined( BOOST_SP_NO_SP_CONVERTIBLE ) intrusive_ptr( intrusive_ptr<U> const & rhs, typename detail::sp_enable_if_convertible<U,T>::type = detail::sp_empty() ) #else intrusive_ptr( intrusive_ptr<U> const & rhs ) #endif : px( rhs.get() ) { if( px != 0 ) intrusive_ptr_add_ref( px ); } #endif intrusive_ptr(intrusive_ptr const & rhs): px( rhs.px ) { if( px != 0 ) intrusive_ptr_add_ref( px ); } ~intrusive_ptr() { if( px != 0 ) intrusive_ptr_release( px ); } #if !defined(BOOST_NO_MEMBER_TEMPLATES) || defined(BOOST_MSVC6_MEMBER_TEMPLATES) template<class U> intrusive_ptr & operator=(intrusive_ptr<U> const & rhs) { this_type(rhs).swap(*this); return *this; } #endif intrusive_ptr & operator=(intrusive_ptr const & rhs) { this_type(rhs).swap(*this); return *this; } intrusive_ptr & operator=(T * rhs) { this_type(rhs).swap(*this); return *this; } void reset() { this_type().swap( *this ); } void reset( T * rhs ) { this_type( rhs ).swap( *this ); } T * get() const { return px; } T & operator*() const { BOOST_ASSERT( px != 0 ); return *px; } T * operator->() const { BOOST_ASSERT( px != 0 ); return px; } // implicit conversion to "bool" #include <boost/smart_ptr/detail/operator_bool.hpp> void swap(intrusive_ptr & rhs) { T * tmp = px; px = rhs.px; rhs.px = tmp; } private: T * px; }; template<class T, class U> inline bool operator==(intrusive_ptr<T> const & a, intrusive_ptr<U> const & b) { return a.get() == b.get(); } template<class T, class U> inline bool operator!=(intrusive_ptr<T> const & a, intrusive_ptr<U> const & b) { return a.get() != b.get(); } template<class T, class U> inline bool operator==(intrusive_ptr<T> const & a, U * b) { return a.get() == b; } template<class T, class U> inline bool operator!=(intrusive_ptr<T> const & a, U * b) { return a.get() != b; } template<class T, class U> inline bool operator==(T * a, intrusive_ptr<U> const & b) { return a == b.get(); } template<class T, class U> inline bool operator!=(T * a, intrusive_ptr<U> const & b) { return a != 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!=(intrusive_ptr<T> const & a, intrusive_ptr<T> const & b) { return a.get() != b.get(); } #endif template<class T> inline bool operator<(intrusive_ptr<T> const & a, intrusive_ptr<T> const & b) { return std::less<T *>()(a.get(), b.get()); } template<class T> void swap(intrusive_ptr<T> & lhs, intrusive_ptr<T> & rhs) { lhs.swap(rhs); } // mem_fn support template<class T> T * get_pointer(intrusive_ptr<T> const & p) { return p.get(); } template<class T, class U> intrusive_ptr<T> static_pointer_cast(intrusive_ptr<U> const & p) { return static_cast<T *>(p.get()); } template<class T, class U> intrusive_ptr<T> const_pointer_cast(intrusive_ptr<U> const & p) { return const_cast<T *>(p.get()); } template<class T, class U> intrusive_ptr<T> dynamic_pointer_cast(intrusive_ptr<U> const & p) { return dynamic_cast<T *>(p.get()); } // operator<< #if !defined(BOOST_NO_IOSTREAM) #if defined(BOOST_NO_TEMPLATED_IOSTREAMS) || ( defined(__GNUC__) && (__GNUC__ < 3) ) template<class Y> std::ostream & operator<< (std::ostream & os, intrusive_ptr<Y> const & p) { os << p.get(); return os; } #else // in STLport's no-iostreams mode no iostream symbols can be used #ifndef _STLP_NO_IOSTREAMS # if defined(BOOST_MSVC) && BOOST_WORKAROUND(BOOST_MSVC, < 1300 && __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, intrusive_ptr<Y> const & p) # else template<class E, class T, class Y> std::basic_ostream<E, T> & operator<< (std::basic_ostream<E, T> & os, intrusive_ptr<Y> const & p) # endif { os << p.get(); return os; } #endif // _STLP_NO_IOSTREAMS #endif // __GNUC__ < 3 #endif // !defined(BOOST_NO_IOSTREAM) } // namespace boost #ifdef BOOST_MSVC # pragma warning(pop) #endif #endif // #ifndef BOOST_SMART_PTR_INTRUSIVE_PTR_HPP_INCLUDED