forked from boostorg/smart_ptr
291 lines
6.1 KiB
C++
291 lines
6.1 KiB
C++
#ifndef BOOST_SMART_PTR_INTRUSIVE_PTR_HPP_INCLUDED
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#define BOOST_SMART_PTR_INTRUSIVE_PTR_HPP_INCLUDED
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//
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// intrusive_ptr.hpp
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//
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// Copyright (c) 2001, 2002 Peter Dimov
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//
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// Distributed under the Boost Software License, Version 1.0. (See
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// accompanying file LICENSE_1_0.txt or copy at
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// http://www.boost.org/LICENSE_1_0.txt)
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//
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// See http://www.boost.org/libs/smart_ptr/intrusive_ptr.html for documentation.
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//
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#include <boost/config.hpp>
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#include <boost/assert.hpp>
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#include <boost/detail/workaround.hpp>
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#include <boost/smart_ptr/detail/sp_convertible.hpp>
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#include <boost/config/no_tr1/functional.hpp> // for std::less
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#if !defined(BOOST_NO_IOSTREAM)
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#if !defined(BOOST_NO_IOSFWD)
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#include <iosfwd> // for std::basic_ostream
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#else
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#include <ostream>
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#endif
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#endif
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namespace boost
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{
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//
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// intrusive_ptr
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//
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// A smart pointer that uses intrusive reference counting.
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//
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// Relies on unqualified calls to
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//
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// void intrusive_ptr_add_ref(T * p);
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// void intrusive_ptr_release(T * p);
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//
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// (p != 0)
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//
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// The object is responsible for destroying itself.
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//
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template<class T> class intrusive_ptr
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{
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private:
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typedef intrusive_ptr this_type;
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public:
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typedef T element_type;
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intrusive_ptr(): px( 0 )
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{
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}
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intrusive_ptr( T * p, bool add_ref = true ): px( p )
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{
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if( px != 0 && add_ref ) intrusive_ptr_add_ref( px );
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}
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#if !defined(BOOST_NO_MEMBER_TEMPLATES) || defined(BOOST_MSVC6_MEMBER_TEMPLATES)
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template<class U>
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#if !defined( BOOST_SP_NO_SP_CONVERTIBLE )
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intrusive_ptr( intrusive_ptr<U> const & rhs, typename boost::detail::sp_enable_if_convertible<U,T>::type = boost::detail::sp_empty() )
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#else
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intrusive_ptr( intrusive_ptr<U> const & rhs )
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#endif
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: px( rhs.get() )
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{
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if( px != 0 ) intrusive_ptr_add_ref( px );
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}
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#endif
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intrusive_ptr(intrusive_ptr const & rhs): px( rhs.px )
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{
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if( px != 0 ) intrusive_ptr_add_ref( px );
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}
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~intrusive_ptr()
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{
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if( px != 0 ) intrusive_ptr_release( px );
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}
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#if !defined(BOOST_NO_MEMBER_TEMPLATES) || defined(BOOST_MSVC6_MEMBER_TEMPLATES)
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template<class U> intrusive_ptr & operator=(intrusive_ptr<U> const & rhs)
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{
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this_type(rhs).swap(*this);
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return *this;
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}
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#endif
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// Move support
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#if defined( BOOST_HAS_RVALUE_REFS )
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intrusive_ptr(intrusive_ptr && rhs): px( rhs.px )
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{
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rhs.px = 0;
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}
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intrusive_ptr & operator=(intrusive_ptr && rhs)
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{
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this_type( static_cast< intrusive_ptr && >( rhs ) ).swap(*this);
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return *this;
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}
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#endif
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intrusive_ptr & operator=(intrusive_ptr const & rhs)
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{
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this_type(rhs).swap(*this);
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return *this;
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}
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intrusive_ptr & operator=(T * rhs)
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{
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this_type(rhs).swap(*this);
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return *this;
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}
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void reset()
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{
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this_type().swap( *this );
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}
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void reset( T * rhs )
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{
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this_type( rhs ).swap( *this );
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}
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T * get() const
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{
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return px;
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}
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T & operator*() const
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{
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BOOST_ASSERT( px != 0 );
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return *px;
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}
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T * operator->() const
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{
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BOOST_ASSERT( px != 0 );
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return px;
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}
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// implicit conversion to "bool"
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#include <boost/smart_ptr/detail/operator_bool.hpp>
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void swap(intrusive_ptr & rhs)
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{
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T * tmp = px;
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px = rhs.px;
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rhs.px = tmp;
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}
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private:
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T * px;
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};
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template<class T, class U> inline bool operator==(intrusive_ptr<T> const & a, intrusive_ptr<U> const & b)
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{
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return a.get() == b.get();
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}
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template<class T, class U> inline bool operator!=(intrusive_ptr<T> const & a, intrusive_ptr<U> const & b)
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{
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return a.get() != b.get();
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}
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template<class T, class U> inline bool operator==(intrusive_ptr<T> const & a, U * b)
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{
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return a.get() == b;
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}
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template<class T, class U> inline bool operator!=(intrusive_ptr<T> const & a, U * b)
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{
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return a.get() != b;
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}
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template<class T, class U> inline bool operator==(T * a, intrusive_ptr<U> const & b)
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{
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return a == b.get();
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}
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template<class T, class U> inline bool operator!=(T * a, intrusive_ptr<U> const & b)
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{
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return a != b.get();
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}
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#if __GNUC__ == 2 && __GNUC_MINOR__ <= 96
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// Resolve the ambiguity between our op!= and the one in rel_ops
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template<class T> inline bool operator!=(intrusive_ptr<T> const & a, intrusive_ptr<T> const & b)
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{
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return a.get() != b.get();
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}
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#endif
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template<class T> inline bool operator<(intrusive_ptr<T> const & a, intrusive_ptr<T> const & b)
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{
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return std::less<T *>()(a.get(), b.get());
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}
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template<class T> void swap(intrusive_ptr<T> & lhs, intrusive_ptr<T> & rhs)
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{
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lhs.swap(rhs);
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}
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// mem_fn support
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template<class T> T * get_pointer(intrusive_ptr<T> const & p)
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{
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return p.get();
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}
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template<class T, class U> intrusive_ptr<T> static_pointer_cast(intrusive_ptr<U> const & p)
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{
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return static_cast<T *>(p.get());
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}
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template<class T, class U> intrusive_ptr<T> const_pointer_cast(intrusive_ptr<U> const & p)
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{
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return const_cast<T *>(p.get());
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}
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template<class T, class U> intrusive_ptr<T> dynamic_pointer_cast(intrusive_ptr<U> const & p)
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{
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return dynamic_cast<T *>(p.get());
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}
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// operator<<
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#if !defined(BOOST_NO_IOSTREAM)
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#if defined(BOOST_NO_TEMPLATED_IOSTREAMS) || ( defined(__GNUC__) && (__GNUC__ < 3) )
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template<class Y> std::ostream & operator<< (std::ostream & os, intrusive_ptr<Y> const & p)
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{
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os << p.get();
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return os;
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}
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#else
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// in STLport's no-iostreams mode no iostream symbols can be used
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#ifndef _STLP_NO_IOSTREAMS
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# if defined(BOOST_MSVC) && BOOST_WORKAROUND(BOOST_MSVC, < 1300 && __SGI_STL_PORT)
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// MSVC6 has problems finding std::basic_ostream through the using declaration in namespace _STL
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using std::basic_ostream;
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template<class E, class T, class Y> basic_ostream<E, T> & operator<< (basic_ostream<E, T> & os, intrusive_ptr<Y> const & p)
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# else
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template<class E, class T, class Y> std::basic_ostream<E, T> & operator<< (std::basic_ostream<E, T> & os, intrusive_ptr<Y> const & p)
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# endif
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{
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os << p.get();
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return os;
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}
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#endif // _STLP_NO_IOSTREAMS
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#endif // __GNUC__ < 3
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#endif // !defined(BOOST_NO_IOSTREAM)
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} // namespace boost
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#endif // #ifndef BOOST_SMART_PTR_INTRUSIVE_PTR_HPP_INCLUDED
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