#ifndef BOOST_SHARED_PTR_132_HPP_INCLUDED | |
#define BOOST_SHARED_PTR_132_HPP_INCLUDED | |
// | |
// shared_ptr.hpp | |
// | |
// (C) Copyright Greg Colvin and Beman Dawes 1998, 1999. | |
// Copyright (c) 2001, 2002, 2003 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/serialization/detail/shared_ptr_nmt_132.hpp> | |
#else | |
#include <boost/assert.hpp> | |
#include <boost/checked_delete.hpp> | |
#include <boost/serialization/throw_exception.hpp> | |
#include <boost/detail/workaround.hpp> | |
#include <boost/serialization/access.hpp> | |
#include <boost/serialization/detail/shared_count_132.hpp> | |
#include <memory> // for std::auto_ptr | |
#include <algorithm> // for std::swap | |
#include <functional> // for std::less | |
#include <typeinfo> // for std::bad_cast | |
#include <iosfwd> // for std::basic_ostream | |
#ifdef BOOST_MSVC // moved here to work around VC++ compiler crash | |
# pragma warning(push) | |
# pragma warning(disable:4284) // odd return type for operator-> | |
#endif | |
namespace boost_132 { | |
template<class T> class weak_ptr; | |
template<class T> class enable_shared_from_this; | |
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 T, class Y> void sp_enable_shared_from_this( shared_count const & pn, enable_shared_from_this< T > const * pe, Y const * px ) | |
{ | |
if(pe != 0) pe->_internal_weak_this._internal_assign(const_cast<Y*>(px), pn); | |
} | |
inline void sp_enable_shared_from_this( shared_count const & /*pn*/, ... ) | |
{ | |
} | |
} // 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 BOOST_DEDUCED_TYPENAME detail::shared_ptr_traits< T >::reference reference; | |
shared_ptr(): px(0), pn() // never throws in 1.30+ | |
{ | |
} | |
#if BOOST_WORKAROUND( __BORLANDC__, BOOST_TESTED_AT( 0x564) ) | |
template<class Y> | |
explicit shared_ptr(Y * p): px(p), pn(p, boost::checked_deleter<Y>()) // Y must be complete | |
#else | |
template<class Y> | |
explicit shared_ptr(Y * p): px(p), pn(p, boost::checked_deleter<Y>()) // Y must be complete | |
#endif | |
{ | |
detail::sp_enable_shared_from_this( pn, 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) | |
{ | |
detail::sp_enable_shared_from_this( pn, p, p ); | |
} | |
// generated copy constructor, assignment, destructor are fine... | |
// except that Borland C++ has a bug, and g++ with -Wsynth warns | |
#if defined(__BORLANDC__) || defined(__GNUC__) | |
shared_ptr & operator=(shared_ptr const & r) // never throws | |
{ | |
px = r.px; | |
pn = r.pn; // shared_count::op= doesn't throw | |
return *this; | |
} | |
#endif | |
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(shared_ptr<Y> const & r): px(r.px), pn(r.pn) // never throws | |
{ | |
} | |
template<class Y> | |
shared_ptr(shared_ptr<Y> const & r, detail::static_cast_tag): px(static_cast<element_type *>(r.px)), pn(r.pn) | |
{ | |
} | |
template<class Y> | |
shared_ptr(shared_ptr<Y> const & r, 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) | |
{ | |
if(px == 0) // need to allocate new counter -- the cast failed | |
{ | |
pn = 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) | |
{ | |
if(px == 0) | |
{ | |
boost::serialization::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 = detail::shared_count(r); | |
detail::sp_enable_shared_from_this( pn, tmp, tmp ); | |
} | |
#endif | |
#if !defined(BOOST_MSVC) || (BOOST_MSVC > 1200) | |
template<class Y> | |
shared_ptr & operator=(shared_ptr<Y> const & r) // never throws | |
{ | |
px = r.px; | |
pn = r.pn; // shared_count::op= doesn't throw | |
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; | |
} | |
#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); | |
} | |
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" | |
#if defined(__SUNPRO_CC) && BOOST_WORKAROUND(__SUNPRO_CC, <= 0x530) | |
operator bool () const | |
{ | |
return px != 0; | |
} | |
#elif defined(__MWERKS__) && BOOST_WORKAROUND(__MWERKS__, BOOST_TESTED_AT(0x3003)) | |
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 | |
{ | |
return px == 0; | |
} | |
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(std::type_info const & ti) const | |
{ | |
return pn.get_deleter(ti); | |
} | |
// 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 | |
public: // for serialization | |
T * px; // contained pointer | |
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, 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, 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()); | |
} | |
// 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()); | |
} | |
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()); | |
} | |
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()); | |
} | |
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(__GNUC__) && (__GNUC__ < 3) | |
template<class Y> std::ostream & operator<< (std::ostream & os, shared_ptr<Y> const & p) | |
{ | |
os << p.get(); | |
return os; | |
} | |
#else | |
# if defined(BOOST_MSVC) && BOOST_WORKAROUND(BOOST_MSVC, <= 1200 && __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 | |
// get_deleter (experimental) | |
#if (defined(__GNUC__) && (__GNUC__ < 3)) || (defined(__EDG_VERSION__) && (__EDG_VERSION__ <= 238)) | |
// g++ 2.9x doesn't allow static_cast<X const *>(void *) | |
// apparently EDG 2.38 also doesn't accept it | |
template<class D, class T> D * get_deleter(shared_ptr< T > const & p) | |
{ | |
void const * q = p._internal_get_deleter(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(typeid(D))); | |
} | |
#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_SHARED_PTR_132_HPP_INCLUDED |