forked from boostorg/smart_ptr
702 lines
17 KiB
C++
702 lines
17 KiB
C++
#ifndef BOOST_SMART_PTR_SHARED_PTR_HPP_INCLUDED
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#define BOOST_SMART_PTR_SHARED_PTR_HPP_INCLUDED
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//
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// shared_ptr.hpp
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//
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// (C) Copyright Greg Colvin and Beman Dawes 1998, 1999.
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// Copyright (c) 2001-2008 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/shared_ptr.htm for documentation.
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//
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#include <boost/config.hpp> // for broken compiler workarounds
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#if defined(BOOST_NO_MEMBER_TEMPLATES) && !defined(BOOST_MSVC6_MEMBER_TEMPLATES)
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#include <boost/smart_ptr/detail/shared_ptr_nmt.hpp>
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#else
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// In order to avoid circular dependencies with Boost.TR1
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// we make sure that our include of <memory> doesn't try to
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// pull in the TR1 headers: that's why we use this header
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// rather than including <memory> directly:
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#include <boost/config/no_tr1/memory.hpp> // std::auto_ptr
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#include <boost/assert.hpp>
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#include <boost/checked_delete.hpp>
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#include <boost/throw_exception.hpp>
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#include <boost/smart_ptr/detail/shared_count.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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#if !defined(BOOST_SP_NO_ATOMIC_ACCESS)
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#include <boost/smart_ptr/detail/spinlock_pool.hpp>
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#include <boost/memory_order.hpp>
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#endif
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#include <algorithm> // for std::swap
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#include <functional> // for std::less
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#include <typeinfo> // for std::bad_cast
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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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#ifdef BOOST_MSVC // moved here to work around VC++ compiler crash
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# pragma warning(push)
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# pragma warning(disable:4284) // odd return type for operator->
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#endif
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namespace boost
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{
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template<class T> class shared_ptr;
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template<class T> class weak_ptr;
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template<class T> class enable_shared_from_this;
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template<class T> class enable_shared_from_this2;
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namespace detail
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{
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struct static_cast_tag {};
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struct const_cast_tag {};
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struct dynamic_cast_tag {};
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struct polymorphic_cast_tag {};
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template<class T> struct shared_ptr_traits
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{
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typedef T & reference;
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};
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template<> struct shared_ptr_traits<void>
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{
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typedef void reference;
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};
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#if !defined(BOOST_NO_CV_VOID_SPECIALIZATIONS)
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template<> struct shared_ptr_traits<void const>
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{
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typedef void reference;
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};
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template<> struct shared_ptr_traits<void volatile>
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{
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typedef void reference;
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};
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template<> struct shared_ptr_traits<void const volatile>
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{
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typedef void reference;
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};
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#endif
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// enable_shared_from_this support
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template< class X, class Y, class T > inline void sp_enable_shared_from_this( boost::shared_ptr<X> const * ppx, Y const * py, boost::enable_shared_from_this< T > const * pe )
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{
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if( pe != 0 )
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{
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pe->_internal_accept_owner( ppx, const_cast< Y* >( py ) );
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}
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}
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template< class X, class Y, class T > inline void sp_enable_shared_from_this( boost::shared_ptr<X> * ppx, Y const * py, boost::enable_shared_from_this2< T > const * pe )
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{
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if( pe != 0 )
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{
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pe->_internal_accept_owner( ppx, const_cast< Y* >( py ) );
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}
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}
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#ifdef _MANAGED
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// Avoid C4793, ... causes native code generation
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struct sp_any_pointer
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{
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template<class T> sp_any_pointer( T* ) {}
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};
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inline void sp_enable_shared_from_this( sp_any_pointer, sp_any_pointer, sp_any_pointer )
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{
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}
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#else // _MANAGED
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inline void sp_enable_shared_from_this( ... )
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{
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}
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#endif // _MANAGED
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#if !defined( BOOST_NO_SFINAE ) && !defined( BOOST_NO_TEMPLATE_PARTIAL_SPECIALIZATION ) && !defined( BOOST_NO_AUTO_PTR )
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// rvalue auto_ptr support based on a technique by Dave Abrahams
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template< class T, class R > struct sp_enable_if_auto_ptr
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{
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};
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template< class T, class R > struct sp_enable_if_auto_ptr< std::auto_ptr< T >, R >
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{
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typedef R type;
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};
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#endif
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} // namespace detail
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//
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// shared_ptr
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//
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// An enhanced relative of scoped_ptr with reference counted copy semantics.
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// The object pointed to is deleted when the last shared_ptr pointing to it
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// is destroyed or reset.
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//
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template<class T> class shared_ptr
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{
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private:
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// Borland 5.5.1 specific workaround
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typedef shared_ptr<T> this_type;
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public:
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typedef T element_type;
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typedef T value_type;
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typedef T * pointer;
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typedef typename boost::detail::shared_ptr_traits<T>::reference reference;
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shared_ptr(): px(0), pn() // never throws in 1.30+
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{
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}
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template<class Y>
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explicit shared_ptr( Y * p ): px( p ), pn( p ) // Y must be complete
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{
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boost::detail::sp_enable_shared_from_this( this, p, p );
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}
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//
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// Requirements: D's copy constructor must not throw
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//
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// shared_ptr will release p by calling d(p)
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//
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template<class Y, class D> shared_ptr(Y * p, D d): px(p), pn(p, d)
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{
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boost::detail::sp_enable_shared_from_this( this, p, p );
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}
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// As above, but with allocator. A's copy constructor shall not throw.
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template<class Y, class D, class A> shared_ptr( Y * p, D d, A a ): px( p ), pn( p, d, a )
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{
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boost::detail::sp_enable_shared_from_this( this, p, p );
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}
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// generated copy constructor, destructor are fine
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template<class Y>
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explicit shared_ptr(weak_ptr<Y> const & r): pn(r.pn) // may throw
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{
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// it is now safe to copy r.px, as pn(r.pn) did not throw
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px = r.px;
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}
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template<class Y>
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shared_ptr( weak_ptr<Y> const & r, boost::detail::sp_nothrow_tag ): px( 0 ), pn( r.pn, boost::detail::sp_nothrow_tag() ) // never throws
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{
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if( !pn.empty() )
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{
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px = r.px;
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}
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}
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template<class Y>
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#if !defined( BOOST_SP_NO_SP_CONVERTIBLE )
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shared_ptr( shared_ptr<Y> const & r, typename boost::detail::sp_enable_if_convertible<Y,T>::type = boost::detail::sp_empty() )
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#else
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shared_ptr( shared_ptr<Y> const & r )
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#endif
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: px( r.px ), pn( r.pn ) // never throws
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{
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}
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// aliasing
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template< class Y >
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shared_ptr( shared_ptr<Y> const & r, T * p ): px( p ), pn( r.pn ) // never throws
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{
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}
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template<class Y>
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shared_ptr(shared_ptr<Y> const & r, boost::detail::static_cast_tag): px(static_cast<element_type *>(r.px)), pn(r.pn)
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{
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}
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template<class Y>
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shared_ptr(shared_ptr<Y> const & r, boost::detail::const_cast_tag): px(const_cast<element_type *>(r.px)), pn(r.pn)
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{
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}
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template<class Y>
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shared_ptr(shared_ptr<Y> const & r, boost::detail::dynamic_cast_tag): px(dynamic_cast<element_type *>(r.px)), pn(r.pn)
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{
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if(px == 0) // need to allocate new counter -- the cast failed
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{
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pn = boost::detail::shared_count();
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}
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}
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template<class Y>
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shared_ptr(shared_ptr<Y> const & r, boost::detail::polymorphic_cast_tag): px(dynamic_cast<element_type *>(r.px)), pn(r.pn)
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{
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if(px == 0)
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{
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boost::throw_exception(std::bad_cast());
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}
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}
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#ifndef BOOST_NO_AUTO_PTR
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template<class Y>
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explicit shared_ptr(std::auto_ptr<Y> & r): px(r.get()), pn()
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{
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Y * tmp = r.get();
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pn = boost::detail::shared_count(r);
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boost::detail::sp_enable_shared_from_this( this, tmp, tmp );
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}
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#if !defined( BOOST_NO_SFINAE ) && !defined( BOOST_NO_TEMPLATE_PARTIAL_SPECIALIZATION )
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template<class Ap>
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explicit shared_ptr( Ap r, typename boost::detail::sp_enable_if_auto_ptr<Ap, int>::type = 0 ): px( r.get() ), pn()
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{
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typename Ap::element_type * tmp = r.get();
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pn = boost::detail::shared_count( r );
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boost::detail::sp_enable_shared_from_this( this, tmp, tmp );
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}
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#endif // BOOST_NO_SFINAE, BOOST_NO_TEMPLATE_PARTIAL_SPECIALIZATION
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#endif // BOOST_NO_AUTO_PTR
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// assignment
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shared_ptr & operator=( shared_ptr const & r ) // never throws
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{
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this_type(r).swap(*this);
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return *this;
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}
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#if !defined(BOOST_MSVC) || (BOOST_MSVC >= 1400)
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template<class Y>
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shared_ptr & operator=(shared_ptr<Y> const & r) // never throws
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{
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this_type(r).swap(*this);
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return *this;
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}
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#endif
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#ifndef BOOST_NO_AUTO_PTR
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template<class Y>
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shared_ptr & operator=( std::auto_ptr<Y> & r )
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{
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this_type(r).swap(*this);
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return *this;
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}
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#if !defined( BOOST_NO_SFINAE ) && !defined( BOOST_NO_TEMPLATE_PARTIAL_SPECIALIZATION )
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template<class Ap>
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typename boost::detail::sp_enable_if_auto_ptr< Ap, shared_ptr & >::type operator=( Ap r )
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{
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this_type( r ).swap( *this );
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return *this;
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}
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#endif // BOOST_NO_SFINAE, BOOST_NO_TEMPLATE_PARTIAL_SPECIALIZATION
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#endif // BOOST_NO_AUTO_PTR
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// Move support
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#if defined( BOOST_HAS_RVALUE_REFS )
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shared_ptr( shared_ptr && r ): px( r.px ), pn() // never throws
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{
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pn.swap( r.pn );
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r.px = 0;
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}
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template<class Y>
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#if !defined( BOOST_SP_NO_SP_CONVERTIBLE )
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shared_ptr( shared_ptr<Y> && r, typename boost::detail::sp_enable_if_convertible<Y,T>::type = boost::detail::sp_empty() )
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#else
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shared_ptr( shared_ptr<Y> && r )
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#endif
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: px( r.px ), pn() // never throws
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{
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pn.swap( r.pn );
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r.px = 0;
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}
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shared_ptr & operator=( shared_ptr && r ) // never throws
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{
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this_type( static_cast< shared_ptr && >( r ) ).swap( *this );
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return *this;
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}
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template<class Y>
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shared_ptr & operator=( shared_ptr<Y> && r ) // never throws
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{
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this_type( static_cast< shared_ptr<Y> && >( r ) ).swap( *this );
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return *this;
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}
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#endif
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void reset() // never throws in 1.30+
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{
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this_type().swap(*this);
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}
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template<class Y> void reset(Y * p) // Y must be complete
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{
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BOOST_ASSERT(p == 0 || p != px); // catch self-reset errors
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this_type(p).swap(*this);
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}
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template<class Y, class D> void reset( Y * p, D d )
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{
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this_type( p, d ).swap( *this );
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}
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template<class Y, class D, class A> void reset( Y * p, D d, A a )
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{
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this_type( p, d, a ).swap( *this );
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}
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template<class Y> void reset( shared_ptr<Y> const & r, T * p )
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{
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this_type( r, p ).swap( *this );
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}
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reference operator* () const // never throws
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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 // never throws
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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 * get() const // never throws
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{
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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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bool unique() const // never throws
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{
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return pn.unique();
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}
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long use_count() const // never throws
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{
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return pn.use_count();
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}
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void swap(shared_ptr<T> & other) // never throws
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{
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std::swap(px, other.px);
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pn.swap(other.pn);
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}
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template<class Y> bool _internal_less(shared_ptr<Y> const & rhs) const
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{
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return pn < rhs.pn;
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}
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void * _internal_get_deleter( boost::detail::sp_typeinfo const & ti ) const
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{
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return pn.get_deleter( ti );
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}
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bool _internal_equiv( shared_ptr const & r ) const
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{
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return px == r.px && pn == r.pn;
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}
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// Tasteless as this may seem, making all members public allows member templates
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// to work in the absence of member template friends. (Matthew Langston)
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#ifndef BOOST_NO_MEMBER_TEMPLATE_FRIENDS
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private:
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template<class Y> friend class shared_ptr;
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template<class Y> friend class weak_ptr;
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#endif
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T * px; // contained pointer
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boost::detail::shared_count pn; // reference counter
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}; // shared_ptr
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template<class T, class U> inline bool operator==(shared_ptr<T> const & a, shared_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!=(shared_ptr<T> const & a, shared_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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#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!=(shared_ptr<T> const & a, shared_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, class U> inline bool operator<(shared_ptr<T> const & a, shared_ptr<U> const & b)
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{
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return a._internal_less(b);
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}
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template<class T> inline void swap(shared_ptr<T> & a, shared_ptr<T> & b)
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{
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a.swap(b);
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}
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template<class T, class U> shared_ptr<T> static_pointer_cast(shared_ptr<U> const & r)
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{
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return shared_ptr<T>(r, boost::detail::static_cast_tag());
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}
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template<class T, class U> shared_ptr<T> const_pointer_cast(shared_ptr<U> const & r)
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{
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return shared_ptr<T>(r, boost::detail::const_cast_tag());
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}
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template<class T, class U> shared_ptr<T> dynamic_pointer_cast(shared_ptr<U> const & r)
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{
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return shared_ptr<T>(r, boost::detail::dynamic_cast_tag());
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}
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// shared_*_cast names are deprecated. Use *_pointer_cast instead.
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template<class T, class U> shared_ptr<T> shared_static_cast(shared_ptr<U> const & r)
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{
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return shared_ptr<T>(r, boost::detail::static_cast_tag());
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}
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template<class T, class U> shared_ptr<T> shared_dynamic_cast(shared_ptr<U> const & r)
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{
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return shared_ptr<T>(r, boost::detail::dynamic_cast_tag());
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}
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template<class T, class U> shared_ptr<T> shared_polymorphic_cast(shared_ptr<U> const & r)
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{
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return shared_ptr<T>(r, boost::detail::polymorphic_cast_tag());
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}
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template<class T, class U> shared_ptr<T> shared_polymorphic_downcast(shared_ptr<U> const & r)
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{
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BOOST_ASSERT(dynamic_cast<T *>(r.get()) == r.get());
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return shared_static_cast<T>(r);
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}
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// get_pointer() enables boost::mem_fn to recognize shared_ptr
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template<class T> inline T * get_pointer(shared_ptr<T> const & p)
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{
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return p.get();
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}
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|
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// operator<<
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|
|
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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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|
|
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template<class Y> std::ostream & operator<< (std::ostream & os, shared_ptr<Y> const & p)
|
|
{
|
|
os << p.get();
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|
return os;
|
|
}
|
|
|
|
#else
|
|
|
|
// in STLport's no-iostreams mode no iostream symbols can be used
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|
#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
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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, shared_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, shared_ptr<Y> const & p)
|
|
# endif
|
|
{
|
|
os << p.get();
|
|
return os;
|
|
}
|
|
|
|
#endif // _STLP_NO_IOSTREAMS
|
|
|
|
#endif // __GNUC__ < 3
|
|
|
|
#endif // !defined(BOOST_NO_IOSTREAM)
|
|
|
|
// get_deleter
|
|
|
|
#if ( defined(__GNUC__) && BOOST_WORKAROUND(__GNUC__, < 3) ) || \
|
|
( defined(__EDG_VERSION__) && BOOST_WORKAROUND(__EDG_VERSION__, <= 238) ) || \
|
|
( defined(__HP_aCC) && BOOST_WORKAROUND(__HP_aCC, <= 33500) )
|
|
|
|
// g++ 2.9x doesn't allow static_cast<X const *>(void *)
|
|
// apparently EDG 2.38 and HP aCC A.03.35 also don't accept it
|
|
|
|
template<class D, class T> D * get_deleter(shared_ptr<T> const & p)
|
|
{
|
|
void const * q = p._internal_get_deleter(BOOST_SP_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(BOOST_SP_TYPEID(D)));
|
|
}
|
|
|
|
#endif
|
|
|
|
// atomic access
|
|
|
|
#if !defined(BOOST_SP_NO_ATOMIC_ACCESS)
|
|
|
|
template<class T> inline bool atomic_is_lock_free( shared_ptr<T> const * /*p*/ )
|
|
{
|
|
return false;
|
|
}
|
|
|
|
template<class T> shared_ptr<T> atomic_load( shared_ptr<T> const * p )
|
|
{
|
|
boost::detail::spinlock_pool<2>::scoped_lock lock( p );
|
|
return *p;
|
|
}
|
|
|
|
template<class T> inline shared_ptr<T> atomic_load_explicit( shared_ptr<T> const * p, memory_order /*mo*/ )
|
|
{
|
|
return atomic_load( p );
|
|
}
|
|
|
|
template<class T> void atomic_store( shared_ptr<T> * p, shared_ptr<T> r )
|
|
{
|
|
boost::detail::spinlock_pool<2>::scoped_lock lock( p );
|
|
p->swap( r );
|
|
}
|
|
|
|
template<class T> inline void atomic_store_explicit( shared_ptr<T> * p, shared_ptr<T> r, memory_order /*mo*/ )
|
|
{
|
|
atomic_store( p, r ); // std::move( r )
|
|
}
|
|
|
|
template<class T> shared_ptr<T> atomic_exchange( shared_ptr<T> * p, shared_ptr<T> r )
|
|
{
|
|
boost::detail::spinlock & sp = boost::detail::spinlock_pool<2>::spinlock_for( p );
|
|
|
|
sp.lock();
|
|
p->swap( r );
|
|
sp.unlock();
|
|
|
|
return r; // return std::move( r )
|
|
}
|
|
|
|
template<class T> shared_ptr<T> atomic_exchange_explicit( shared_ptr<T> * p, shared_ptr<T> r, memory_order /*mo*/ )
|
|
{
|
|
return atomic_exchange( p, r ); // std::move( r )
|
|
}
|
|
|
|
template<class T> bool atomic_compare_exchange( shared_ptr<T> * p, shared_ptr<T> * v, shared_ptr<T> w )
|
|
{
|
|
boost::detail::spinlock & sp = boost::detail::spinlock_pool<2>::spinlock_for( p );
|
|
|
|
sp.lock();
|
|
|
|
if( p->_internal_equiv( *v ) )
|
|
{
|
|
p->swap( w );
|
|
|
|
sp.unlock();
|
|
|
|
return true;
|
|
}
|
|
else
|
|
{
|
|
shared_ptr<T> tmp( *p );
|
|
|
|
sp.unlock();
|
|
|
|
tmp.swap( *v );
|
|
return false;
|
|
}
|
|
}
|
|
|
|
template<class T> inline bool atomic_compare_exchange_explicit( shared_ptr<T> * p, shared_ptr<T> * v, shared_ptr<T> w, memory_order /*success*/, memory_order /*failure*/ )
|
|
{
|
|
return atomic_compare_exchange( p, v, w ); // std::move( w )
|
|
}
|
|
|
|
#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_SMART_PTR_SHARED_PTR_HPP_INCLUDED
|