shared_ptr.hpp

Go to the documentation of this file.

#ifndef BOOST_SMART_PTR_SHARED_PTR_HPP_INCLUDED
#define BOOST_SMART_PTR_SHARED_PTR_HPP_INCLUDED
 
//
//  shared_ptr.hpp
//
//  (C) Copyright Greg Colvin and Beman Dawes 1998, 1999.
//  Copyright (c) 2001-2008 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/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/smart_ptr/detail/shared_ptr_nmt.hpp>
#else
 
// In order to avoid circular dependencies with Boost.TR1
// we make sure that our include of <memory> doesn't try to
// pull in the TR1 headers: that's why we use this header
// rather than including <memory> directly:
#include <boost/config/no_tr1/memory.hpp>  // std::auto_ptr
 
#include <boost/assert.hpp>
#include <boost/checked_delete.hpp>
#include <boost/throw_exception.hpp>
#include <boost/smart_ptr/detail/shared_count.hpp>
#include <boost/detail/workaround.hpp>
#include <boost/smart_ptr/detail/sp_convertible.hpp>
 
#if !defined(BOOST_SP_NO_ATOMIC_ACCESS)
#include <boost/smart_ptr/detail/spinlock_pool.hpp>
#include <boost/memory_order.hpp>
#endif
 
#include <algorithm>            // for std::swap
#include <functional>           // for std::less
#include <typeinfo>             // for std::bad_cast
#include <cstddef>              // for std::size_t
 
#if !defined(BOOST_NO_IOSTREAM)
#if !defined(BOOST_NO_IOSFWD)
#include <iosfwd>               // for std::basic_ostream
#else
#include <ostream>
#endif
#endif
 
namespace boost
{
 
template<class T> class shared_ptr;
template<class T> class weak_ptr;
template<class T> class enable_shared_from_this;
template<class T> class enable_shared_from_this2;
 
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 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 )
{
    if( pe != 0 )
    {
        pe->_internal_accept_owner( ppx, const_cast< Y* >( py ) );
    }
}
 
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 )
{
    if( pe != 0 )
    {
        pe->_internal_accept_owner( ppx, const_cast< Y* >( py ) );
    }
}
 
#ifdef _MANAGED
 
// Avoid C4793, ... causes native code generation
 
struct sp_any_pointer
{
    template<class T> sp_any_pointer( T* ) {}
};
 
inline void sp_enable_shared_from_this( sp_any_pointer, sp_any_pointer, sp_any_pointer )
{
}
 
#else // _MANAGED
 
inline void sp_enable_shared_from_this( ... )
{
}
 
#endif // _MANAGED
 
#if !defined( BOOST_NO_SFINAE ) && !defined( BOOST_NO_TEMPLATE_PARTIAL_SPECIALIZATION ) && !defined( BOOST_NO_AUTO_PTR )
 
// rvalue auto_ptr support based on a technique by Dave Abrahams
 
template< class T, class R > struct sp_enable_if_auto_ptr
{
};
 
template< class T, class R > struct sp_enable_if_auto_ptr< std::auto_ptr< T >, R >
{
    typedef R type;
};
 
#endif
 
} // 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 boost::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 ) // Y must be complete
    {
        boost::detail::sp_enable_shared_from_this( this, p, p );
    }
 
    //
    // 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)
    {
        boost::detail::sp_enable_shared_from_this( this, p, p );
    }
 
    // As above, but with allocator. A's copy constructor shall not throw.
 
    template<class Y, class D, class A> shared_ptr( Y * p, D d, A a ): px( p ), pn( p, d, a )
    {
        boost::detail::sp_enable_shared_from_this( this, p, p );
    }
 
//  generated copy constructor, destructor are fine
 
    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( weak_ptr<Y> const & r, boost::detail::sp_nothrow_tag ): px( 0 ), pn( r.pn, boost::detail::sp_nothrow_tag() ) // never throws
    {
        if( !pn.empty() )
        {
            px = r.px;
        }
    }
 
    template<class Y>
#if !defined( BOOST_SP_NO_SP_CONVERTIBLE )
 
    shared_ptr( shared_ptr<Y> const & r, typename boost::detail::sp_enable_if_convertible<Y,T>::type = boost::detail::sp_empty() )
 
#else
 
    shared_ptr( shared_ptr<Y> const & r )
 
#endif
    : px( r.px ), pn( r.pn ) // never throws
    {
    }
 
    // aliasing
    template< class Y >
    shared_ptr( shared_ptr<Y> const & r, T * p ): px( p ), pn( r.pn ) // never throws
    {
    }
 
    template<class Y>
    shared_ptr(shared_ptr<Y> const & r, boost::detail::static_cast_tag): px(static_cast<element_type *>(r.px)), pn(r.pn)
    {
    }
 
    template<class Y>
    shared_ptr(shared_ptr<Y> const & r, boost::detail::const_cast_tag): px(const_cast<element_type *>(r.px)), pn(r.pn)
    {
    }
 
    template<class Y>
    shared_ptr(shared_ptr<Y> const & r, boost::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 = boost::detail::shared_count();
        }
    }
 
    template<class Y>
    shared_ptr(shared_ptr<Y> const & r, boost::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 = boost::detail::shared_count(r);
        boost::detail::sp_enable_shared_from_this( this, tmp, tmp );
    }
 
#if !defined( BOOST_NO_SFINAE ) && !defined( BOOST_NO_TEMPLATE_PARTIAL_SPECIALIZATION )
 
    template<class Ap>
    explicit shared_ptr( Ap r, typename boost::detail::sp_enable_if_auto_ptr<Ap, int>::type = 0 ): px( r.get() ), pn()
    {
        typename Ap::element_type * tmp = r.get();
        pn = boost::detail::shared_count( r );
        boost::detail::sp_enable_shared_from_this( this, tmp, tmp );
    }
 
 
#endif // BOOST_NO_SFINAE, BOOST_NO_TEMPLATE_PARTIAL_SPECIALIZATION
 
#endif // BOOST_NO_AUTO_PTR
 
    // assignment
 
    shared_ptr & operator=( shared_ptr const & r ) // never throws
    {
        this_type(r).swap(*this);
        return *this;
    }
 
#if !defined(BOOST_MSVC) || (BOOST_MSVC >= 1400)
 
    template<class Y>
    shared_ptr & operator=(shared_ptr<Y> const & r) // never throws
    {
        this_type(r).swap(*this);
        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;
    }
 
#if !defined( BOOST_NO_SFINAE ) && !defined( BOOST_NO_TEMPLATE_PARTIAL_SPECIALIZATION )
 
    template<class Ap>
    typename boost::detail::sp_enable_if_auto_ptr< Ap, shared_ptr & >::type operator=( Ap r )
    {
        this_type( r ).swap( *this );
        return *this;
    }
 
 
#endif // BOOST_NO_SFINAE, BOOST_NO_TEMPLATE_PARTIAL_SPECIALIZATION
 
#endif // BOOST_NO_AUTO_PTR
 
// Move support
 
#if defined( BOOST_HAS_RVALUE_REFS )
 
    shared_ptr( shared_ptr && r ): px( r.px ), pn() // never throws
    {
        pn.swap( r.pn );
        r.px = 0;
    }
 
    template<class Y>
#if !defined( BOOST_SP_NO_SP_CONVERTIBLE )
 
    shared_ptr( shared_ptr<Y> && r, typename boost::detail::sp_enable_if_convertible<Y,T>::type = boost::detail::sp_empty() )
 
#else
 
    shared_ptr( shared_ptr<Y> && r )
 
#endif
    : px( r.px ), pn() // never throws
    {
        pn.swap( r.pn );
        r.px = 0;
    }
 
    shared_ptr & operator=( shared_ptr && r ) // never throws
    {
        this_type( static_cast< shared_ptr && >( r ) ).swap( *this );
        return *this;
    }
 
    template<class Y>
    shared_ptr & operator=( shared_ptr<Y> && r ) // never throws
    {
        this_type( static_cast< shared_ptr<Y> && >( 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 );
    }
 
    template<class Y, class D, class A> void reset( Y * p, D d, A a )
    {
        this_type( p, d, a ).swap( *this );
    }
 
    template<class Y> void reset( shared_ptr<Y> const & r, T * p )
    {
        this_type( r, p ).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"
#include <boost/smart_ptr/detail/operator_bool.hpp>
 
    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( boost::detail::sp_typeinfo const & ti ) const
    {
        return pn.get_deleter( ti );
    }
 
    bool _internal_equiv( shared_ptr const & r ) const
    {
        return px == r.px && pn == r.pn;
    }
 
// Tasteless as this may seem, making all members public allows member templates
// to work in the absence of member template friends. (Matthew Langston)
 
#ifndef BOOST_NO_MEMBER_TEMPLATE_FRIENDS
 
private:
 
    template<class Y> friend class shared_ptr;
    template<class Y> friend class weak_ptr;
 
 
#endif
 
    T * px;                     // contained pointer
    boost::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, boost::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, boost::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, boost::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, boost::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, boost::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, boost::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(BOOST_NO_IOSTREAM)
 
#if defined(BOOST_NO_TEMPLATED_IOSTREAMS) || ( defined(__GNUC__) &&  (__GNUC__ < 3) )
 
template<class Y> std::ostream & operator<< (std::ostream & os, shared_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, 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 // _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 // !defined(BOOST_SP_NO_ATOMIC_ACCESS)
 
// hash_value
 
template< class T > struct hash;
 
template< class T > std::size_t hash_value( boost::shared_ptr<T> const & p )
{
    return boost::hash< T* >()( p.get() );
}
 
} // namespace boost
 
#endif  // #if defined(BOOST_NO_MEMBER_TEMPLATES) && !defined(BOOST_MSVC6_MEMBER_TEMPLATES)
 
#endif  // #ifndef BOOST_SMART_PTR_SHARED_PTR_HPP_INCLUDED