// shared_ptr.hpp
//
// (C) Copyright Greg Colvin and Beman Dawes 1998, 1999.
-// Copyright (c) 2001, 2002, 2003 Peter Dimov
+// Copyright (c) 2001-2006 Peter Dimov
//
-// Permission to copy, use, modify, sell and distribute this software
-// is granted provided this copyright notice appears in all copies.
-// This software is provided "as is" without express or implied
-// warranty, and with no claim as to its suitability for any purpose.
+// 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/detail/shared_ptr_nmt.hpp>
#else
+#include <memory> // for std::auto_ptr
+
#include <boost/assert.hpp>
#include <boost/checked_delete.hpp>
#include <boost/throw_exception.hpp>
#include <boost/detail/shared_count.hpp>
#include <boost/detail/workaround.hpp>
-#include <memory> // for std::auto_ptr
#include <algorithm> // for std::swap
#include <functional> // for std::less
#include <typeinfo> // for std::bad_cast
{
struct static_cast_tag {};
+struct const_cast_tag {};
struct dynamic_cast_tag {};
struct polymorphic_cast_tag {};
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 T, class Y> void sp_enable_shared_from_this(boost::enable_shared_from_this<T> * pe, Y * px, shared_count const & pn)
+template<class T, class Y> void sp_enable_shared_from_this( shared_count const & pn, boost::enable_shared_from_this<T> const * pe, Y const * px )
{
- if(pe != 0) pe->_internal_weak_this._internal_assign(px, pn);
+ if(pe != 0) pe->_internal_weak_this._internal_assign(const_cast<Y*>(px), pn);
}
-inline void sp_enable_shared_from_this(void const *, void const *, shared_count const &)
+#ifdef sgi
+// Turn off: the last argument of the varargs function "sp_enable_shared_from_this" is unnamed
+# pragma set woff 3506
+#endif
+
+inline void sp_enable_shared_from_this( shared_count const & /*pn*/, ... )
{
}
+#ifdef sgi
+# pragma reset woff 3506
+#endif
+
+#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
typedef T element_type;
typedef T value_type;
typedef T * pointer;
- typedef typename detail::shared_ptr_traits<T>::reference reference;
+ 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, checked_deleter<Y>()) // Y must be complete
+ explicit shared_ptr( Y * p ): px( p ), pn( p ) // Y must be complete
{
- detail::sp_enable_shared_from_this(p, p, pn);
+ boost::detail::sp_enable_shared_from_this( pn, p, p );
}
//
template<class Y, class D> shared_ptr(Y * p, D d): px(p), pn(p, d)
{
- detail::sp_enable_shared_from_this(p, p, pn);
+ boost::detail::sp_enable_shared_from_this( pn, 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( pn, p, p );
}
// generated copy constructor, assignment, destructor are fine...
}
template<class Y>
- shared_ptr(shared_ptr<Y> const & r, detail::static_cast_tag): px(static_cast<element_type *>(r.px)), pn(r.pn)
+ 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, detail::dynamic_cast_tag): px(dynamic_cast<element_type *>(r.px)), pn(r.pn)
+ 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 = detail::shared_count();
+ pn = boost::detail::shared_count();
}
}
template<class Y>
- shared_ptr(shared_ptr<Y> const & r, detail::polymorphic_cast_tag): px(dynamic_cast<element_type *>(r.px)), pn(r.pn)
+ 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)
{
explicit shared_ptr(std::auto_ptr<Y> & r): px(r.get()), pn()
{
Y * tmp = r.get();
- pn = detail::shared_count(r);
- detail::sp_enable_shared_from_this(tmp, tmp, pn);
+ pn = boost::detail::shared_count(r);
+ boost::detail::sp_enable_shared_from_this( pn, tmp, tmp );
}
-#endif
+#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( pn, tmp, tmp );
+ }
-#if !defined(BOOST_MSVC) || (BOOST_MSVC > 1200)
+
+#endif // BOOST_NO_SFINAE, BOOST_NO_TEMPLATE_PARTIAL_SPECIALIZATION
+
+#endif // BOOST_NO_AUTO_PTR
+
+#if !defined(BOOST_MSVC) || (BOOST_MSVC >= 1300)
template<class Y>
shared_ptr & operator=(shared_ptr<Y> const & r) // never throws
#ifndef BOOST_NO_AUTO_PTR
template<class Y>
- shared_ptr & operator=(std::auto_ptr<Y> & r)
+ shared_ptr & operator=( std::auto_ptr<Y> & r )
{
this_type(r).swap(*this);
return *this;
}
-#endif
+#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
void reset() // never throws in 1.30+
{
this_type(p).swap(*this);
}
- template<class Y, class D> void reset(Y * p, D d)
+ template<class Y, class D> void reset( Y * p, D d )
{
- this_type(p, d).swap(*this);
+ 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 );
}
reference operator* () const // never throws
// implicit conversion to "bool"
- typedef T * (this_type::*unspecified_bool_type)() const;
+#if defined(__SUNPRO_CC) && BOOST_WORKAROUND(__SUNPRO_CC, <= 0x580)
+
+ operator bool () const
+ {
+ return px != 0;
+ }
+
+#elif defined( _MANAGED )
+
+ static void unspecified_bool( this_type*** )
+ {
+ }
+
+ typedef void (*unspecified_bool_type)( this_type*** );
+
+ operator unspecified_bool_type() const // never throws
+ {
+ return px == 0? 0: unspecified_bool;
+ }
+
+#elif \
+ ( defined(__MWERKS__) && BOOST_WORKAROUND(__MWERKS__, < 0x3200) ) || \
+ ( defined(__GNUC__) && (__GNUC__ * 100 + __GNUC_MINOR__ < 304) )
+ typedef T * (this_type::*unspecified_bool_type)() const;
+
operator unspecified_bool_type() const // never throws
{
return px == 0? 0: &this_type::get;
}
+#else
+
+ typedef T * this_type::*unspecified_bool_type;
+
+ operator unspecified_bool_type() const // never throws
+ {
+ return px == 0? 0: &this_type::px;
+ }
+
+#endif
+
// operator! is redundant, but some compilers need it
bool operator! () const // never throws
#endif
T * px; // contained pointer
- detail::shared_count pn; // reference counter
+ boost::detail::shared_count pn; // reference counter
}; // shared_ptr
template<class T, class U> shared_ptr<T> static_pointer_cast(shared_ptr<U> const & r)
{
- return shared_ptr<T>(r, detail::static_cast_tag());
+ 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, detail::dynamic_cast_tag());
+ 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, detail::static_cast_tag());
+ 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, detail::dynamic_cast_tag());
+ 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, detail::polymorphic_cast_tag());
+ 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)
#else
-# if BOOST_WORKAROUND(BOOST_MSVC, <= 1200 && __SGI_STL_PORT)
+// 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)
return os;
}
-#endif
+#endif // _STLP_NO_IOSTREAMS
+
+#endif // __GNUC__ < 3
// get_deleter (experimental)
-#if defined(__GNUC__) && (__GNUC__ < 3)
+#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)
{
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