sl@0: #ifndef BOOST_INTRUSIVE_PTR_HPP_INCLUDED
sl@0: #define BOOST_INTRUSIVE_PTR_HPP_INCLUDED
sl@0: 
sl@0: //
sl@0: //  intrusive_ptr.hpp
sl@0: //
sl@0: //  Copyright (c) 2001, 2002 Peter Dimov
sl@0: //
sl@0: // Distributed under the Boost Software License, Version 1.0. (See
sl@0: // accompanying file LICENSE_1_0.txt or copy at
sl@0: // http://www.boost.org/LICENSE_1_0.txt)
sl@0: //
sl@0: //  See http://www.boost.org/libs/smart_ptr/intrusive_ptr.html for documentation.
sl@0: //
sl@0: 
sl@0: #include <boost/config.hpp>
sl@0: 
sl@0: #ifdef BOOST_MSVC  // moved here to work around VC++ compiler crash
sl@0: # pragma warning(push)
sl@0: # pragma warning(disable:4284) // odd return type for operator->
sl@0: #endif
sl@0: 
sl@0: #include <boost/assert.hpp>
sl@0: #include <boost/detail/workaround.hpp>
sl@0: 
sl@0: #include <functional>           // for std::less
sl@0: #include <iosfwd>               // for std::basic_ostream
sl@0: 
sl@0: 
sl@0: namespace boost
sl@0: {
sl@0: 
sl@0: //
sl@0: //  intrusive_ptr
sl@0: //
sl@0: //  A smart pointer that uses intrusive reference counting.
sl@0: //
sl@0: //  Relies on unqualified calls to
sl@0: //  
sl@0: //      void intrusive_ptr_add_ref(T * p);
sl@0: //      void intrusive_ptr_release(T * p);
sl@0: //
sl@0: //          (p != 0)
sl@0: //
sl@0: //  The object is responsible for destroying itself.
sl@0: //
sl@0: 
sl@0: template<class T> class intrusive_ptr
sl@0: {
sl@0: private:
sl@0: 
sl@0:     typedef intrusive_ptr this_type;
sl@0: 
sl@0: public:
sl@0: 
sl@0:     typedef T element_type;
sl@0: 
sl@0:     intrusive_ptr(): p_(0)
sl@0:     {
sl@0:     }
sl@0: 
sl@0:     intrusive_ptr(T * p, bool add_ref = true): p_(p)
sl@0:     {
sl@0:         if(p_ != 0 && add_ref) intrusive_ptr_add_ref(p_);
sl@0:     }
sl@0: 
sl@0: #if !defined(BOOST_NO_MEMBER_TEMPLATES) || defined(BOOST_MSVC6_MEMBER_TEMPLATES)
sl@0: 
sl@0:     template<class U> intrusive_ptr(intrusive_ptr<U> const & rhs): p_(rhs.get())
sl@0:     {
sl@0:         if(p_ != 0) intrusive_ptr_add_ref(p_);
sl@0:     }
sl@0: 
sl@0: #endif
sl@0: 
sl@0:     intrusive_ptr(intrusive_ptr const & rhs): p_(rhs.p_)
sl@0:     {
sl@0:         if(p_ != 0) intrusive_ptr_add_ref(p_);
sl@0:     }
sl@0: 
sl@0:     ~intrusive_ptr()
sl@0:     {
sl@0:         if(p_ != 0) intrusive_ptr_release(p_);
sl@0:     }
sl@0: 
sl@0: #if !defined(BOOST_NO_MEMBER_TEMPLATES) || defined(BOOST_MSVC6_MEMBER_TEMPLATES)
sl@0: 
sl@0:     template<class U> intrusive_ptr & operator=(intrusive_ptr<U> const & rhs)
sl@0:     {
sl@0:         this_type(rhs).swap(*this);
sl@0:         return *this;
sl@0:     }
sl@0: 
sl@0: #endif
sl@0: 
sl@0:     intrusive_ptr & operator=(intrusive_ptr const & rhs)
sl@0:     {
sl@0:         this_type(rhs).swap(*this);
sl@0:         return *this;
sl@0:     }
sl@0: 
sl@0:     intrusive_ptr & operator=(T * rhs)
sl@0:     {
sl@0:         this_type(rhs).swap(*this);
sl@0:         return *this;
sl@0:     }
sl@0: 
sl@0:     T * get() const
sl@0:     {
sl@0:         return p_;
sl@0:     }
sl@0: 
sl@0:     T & operator*() const
sl@0:     {
sl@0:         return *p_;
sl@0:     }
sl@0: 
sl@0:     T * operator->() const
sl@0:     {
sl@0:         return p_;
sl@0:     }
sl@0: 
sl@0: #if defined(__SUNPRO_CC) && BOOST_WORKAROUND(__SUNPRO_CC, <= 0x530)
sl@0: 
sl@0:     operator bool () const
sl@0:     {
sl@0:         return p_ != 0;
sl@0:     }
sl@0: 
sl@0: #elif defined(__MWERKS__) && BOOST_WORKAROUND(__MWERKS__, BOOST_TESTED_AT(0x3003))
sl@0:     typedef T * (this_type::*unspecified_bool_type)() const;
sl@0:     
sl@0:     operator unspecified_bool_type() const // never throws
sl@0:     {
sl@0:         return p_ == 0? 0: &this_type::get;
sl@0:     }
sl@0: 
sl@0: #else 
sl@0: 
sl@0:     typedef T * this_type::*unspecified_bool_type;
sl@0: 
sl@0:     operator unspecified_bool_type () const
sl@0:     {
sl@0:         return p_ == 0? 0: &this_type::p_;
sl@0:     }
sl@0: 
sl@0: #endif
sl@0: 
sl@0:     // operator! is a Borland-specific workaround
sl@0:     bool operator! () const
sl@0:     {
sl@0:         return p_ == 0;
sl@0:     }
sl@0: 
sl@0:     void swap(intrusive_ptr & rhs)
sl@0:     {
sl@0:         T * tmp = p_;
sl@0:         p_ = rhs.p_;
sl@0:         rhs.p_ = tmp;
sl@0:     }
sl@0: 
sl@0: private:
sl@0: 
sl@0:     T * p_;
sl@0: };
sl@0: 
sl@0: template<class T, class U> inline bool operator==(intrusive_ptr<T> const & a, intrusive_ptr<U> const & b)
sl@0: {
sl@0:     return a.get() == b.get();
sl@0: }
sl@0: 
sl@0: template<class T, class U> inline bool operator!=(intrusive_ptr<T> const & a, intrusive_ptr<U> const & b)
sl@0: {
sl@0:     return a.get() != b.get();
sl@0: }
sl@0: 
sl@0: template<class T, class U> inline bool operator==(intrusive_ptr<T> const & a, U * b)
sl@0: {
sl@0:     return a.get() == b;
sl@0: }
sl@0: 
sl@0: template<class T, class U> inline bool operator!=(intrusive_ptr<T> const & a, U * b)
sl@0: {
sl@0:     return a.get() != b;
sl@0: }
sl@0: 
sl@0: template<class T, class U> inline bool operator==(T * a, intrusive_ptr<U> const & b)
sl@0: {
sl@0:     return a == b.get();
sl@0: }
sl@0: 
sl@0: template<class T, class U> inline bool operator!=(T * a, intrusive_ptr<U> const & b)
sl@0: {
sl@0:     return a != b.get();
sl@0: }
sl@0: 
sl@0: #if __GNUC__ == 2 && __GNUC_MINOR__ <= 96
sl@0: 
sl@0: // Resolve the ambiguity between our op!= and the one in rel_ops
sl@0: 
sl@0: template<class T> inline bool operator!=(intrusive_ptr<T> const & a, intrusive_ptr<T> const & b)
sl@0: {
sl@0:     return a.get() != b.get();
sl@0: }
sl@0: 
sl@0: #endif
sl@0: 
sl@0: template<class T> inline bool operator<(intrusive_ptr<T> const & a, intrusive_ptr<T> const & b)
sl@0: {
sl@0:     return std::less<T *>()(a.get(), b.get());
sl@0: }
sl@0: 
sl@0: template<class T> void swap(intrusive_ptr<T> & lhs, intrusive_ptr<T> & rhs)
sl@0: {
sl@0:     lhs.swap(rhs);
sl@0: }
sl@0: 
sl@0: // mem_fn support
sl@0: 
sl@0: template<class T> T * get_pointer(intrusive_ptr<T> const & p)
sl@0: {
sl@0:     return p.get();
sl@0: }
sl@0: 
sl@0: template<class T, class U> intrusive_ptr<T> static_pointer_cast(intrusive_ptr<U> const & p)
sl@0: {
sl@0:     return static_cast<T *>(p.get());
sl@0: }
sl@0: 
sl@0: template<class T, class U> intrusive_ptr<T> const_pointer_cast(intrusive_ptr<U> const & p)
sl@0: {
sl@0:     return const_cast<T *>(p.get());
sl@0: }
sl@0: 
sl@0: template<class T, class U> intrusive_ptr<T> dynamic_pointer_cast(intrusive_ptr<U> const & p)
sl@0: {
sl@0:     return dynamic_cast<T *>(p.get());
sl@0: }
sl@0: 
sl@0: // operator<<
sl@0: 
sl@0: #if defined(__GNUC__) &&  (__GNUC__ < 3)
sl@0: 
sl@0: template<class Y> std::ostream & operator<< (std::ostream & os, intrusive_ptr<Y> const & p)
sl@0: {
sl@0:     os << p.get();
sl@0:     return os;
sl@0: }
sl@0: 
sl@0: #else
sl@0: 
sl@0: // in STLport's no-iostreams mode no iostream symbols can be used
sl@0: #ifndef _STLP_NO_IOSTREAMS
sl@0: 
sl@0: # if defined(BOOST_MSVC) && BOOST_WORKAROUND(BOOST_MSVC, < 1300 && __SGI_STL_PORT)
sl@0: // MSVC6 has problems finding std::basic_ostream through the using declaration in namespace _STL
sl@0: using std::basic_ostream;
sl@0: template<class E, class T, class Y> basic_ostream<E, T> & operator<< (basic_ostream<E, T> & os, intrusive_ptr<Y> const & p)
sl@0: # else
sl@0: template<class E, class T, class Y> std::basic_ostream<E, T> & operator<< (std::basic_ostream<E, T> & os, intrusive_ptr<Y> const & p)
sl@0: # endif 
sl@0: {
sl@0:     os << p.get();
sl@0:     return os;
sl@0: }
sl@0: 
sl@0: #endif // _STLP_NO_IOSTREAMS
sl@0: 
sl@0: #endif // __GNUC__ < 3
sl@0: 
sl@0: } // namespace boost
sl@0: 
sl@0: #ifdef BOOST_MSVC
sl@0: # pragma warning(pop)
sl@0: #endif    
sl@0: 
sl@0: #endif  // #ifndef BOOST_INTRUSIVE_PTR_HPP_INCLUDED