Skip to content

R
riscv-gcc-1
Commit 459f9f82 by Paolo Carlini Committed by Paolo Carlini
Options

boost_shared_ptr.h: Trivial formatting fixes. 

2006-09-22  Paolo Carlini  <pcarlini@suse.de>

	* include/tr1/boost_shared_ptr.h: Trivial formatting fixes.

From-SVN: r117145
parent 53e3e587
Showing with 890 additions and 875 deletions
libstdc++-v3/ChangeLog
2006-09-22 Paolo Carlini <pcarlini@suse.de>
* include/tr1/boost_shared_ptr.h: Trivial formatting fixes.
2006-09-21 Benjamin Kosnik <bkoz@redhat.com> 2006-09-21 Benjamin Kosnik <bkoz@redhat.com>
* include/ext/type_traits.h (__numeric_traits_integer): New. * include/ext/type_traits.h (__numeric_traits_integer): New.
......
libstdc++-v3/include/tr1/boost_shared_ptr.h
...@@ -58,1009 +58,1020 @@ namespace std ...@@ -58,1009 +58,1020 @@ namespace std
{ {
_GLIBCXX_BEGIN_NAMESPACE(tr1) _GLIBCXX_BEGIN_NAMESPACE(tr1)
class bad_weak_ptr : public std::exception class bad_weak_ptr : public std::exception
{ {
public: public:
virtual char const* virtual char const*
what() const throw() { return "tr1::bad_weak_ptr"; } what() const throw()
}; { return "tr1::bad_weak_ptr"; }
};
// Substitute for bad_weak_ptr object in the case of -fno-exceptions. // Substitute for bad_weak_ptr object in the case of -fno-exceptions.
inline void inline void
__throw_bad_weak_ptr() __throw_bad_weak_ptr()
{ {
#if __EXCEPTIONS #if __EXCEPTIONS
throw bad_weak_ptr(); throw bad_weak_ptr();
#else #else
std::abort(); std::abort();
#endif #endif
} }
using __gnu_cxx::_Lock_policy;
using __gnu_cxx::__default_lock_policy;
using __gnu_cxx::_S_single;
using __gnu_cxx::_S_mutex;
using __gnu_cxx::_S_atomic;
template<typename _Tp> using __gnu_cxx::_Lock_policy;
struct _Sp_deleter using __gnu_cxx::__default_lock_policy;
{ using __gnu_cxx::_S_single;
typedef void result_type; using __gnu_cxx::_S_mutex;
typedef _Tp* argument_type; using __gnu_cxx::_S_atomic;
void template<typename _Tp>
operator()(_Tp* p) const struct _Sp_deleter
{ delete p; } {
}; typedef void result_type;
typedef _Tp* argument_type;
// Empty helper class except when the template argument is _S_mutex. void
template<_Lock_policy _Lp> operator()(_Tp* p) const
class _Mutex_base { delete p; }
{ }; };
template<> // Empty helper class except when the template argument is _S_mutex.
class _Mutex_base<_S_mutex> : public __gnu_cxx::__mutex template<_Lock_policy _Lp>
{ }; class _Mutex_base
{ };
template<>
class _Mutex_base<_S_mutex> : public __gnu_cxx::__mutex
{ };
template<_Lock_policy _Lp = __default_lock_policy> template<_Lock_policy _Lp = __default_lock_policy>
class _Sp_counted_base : public _Mutex_base<_Lp> class _Sp_counted_base : public _Mutex_base<_Lp>
{
public:
_Sp_counted_base() : _M_use_count(1), _M_weak_count(1) { }
virtual
~_Sp_counted_base() // nothrow
{ }
// Called when _M_use_count drops to zero, to release the resources
// managed by *this.
virtual void
dispose() = 0; // nothrow
// Called when _M_weak_count drops to zero.
virtual void
destroy() // nothrow
{ delete this; }
virtual void*
get_deleter(const std::type_info&) = 0;
void
add_ref_copy()
{ __gnu_cxx::__atomic_add(&_M_use_count, 1); }
void
add_ref_lock();
void
release() // nothrow
{ {
if (__gnu_cxx::__exchange_and_add(&_M_use_count, -1) == 1) public:
{ _Sp_counted_base() : _M_use_count(1), _M_weak_count(1) { }
dispose();
#ifdef __GTHREADS virtual
_GLIBCXX_READ_MEM_BARRIER; ~_Sp_counted_base() // nothrow
_GLIBCXX_WRITE_MEM_BARRIER; { }
#endif
if (__gnu_cxx::__exchange_and_add(&_M_weak_count, -1) == 1)
destroy();
}
}
void // Called when _M_use_count drops to zero, to release the resources
weak_add_ref() // nothrow // managed by *this.
{ __gnu_cxx::__atomic_add(&_M_weak_count, 1); } virtual void
dispose() = 0; // nothrow
// Called when _M_weak_count drops to zero.
virtual void
destroy() // nothrow
{ delete this; }
virtual void*
get_deleter(const std::type_info&) = 0;
void
add_ref_copy()
{ __gnu_cxx::__atomic_add(&_M_use_count, 1); }
void void
weak_release() // nothrow add_ref_lock();
{
if (__gnu_cxx::__exchange_and_add(&_M_weak_count, -1) == 1) void
{ release() // nothrow
#ifdef __GTHREADS {
_GLIBCXX_READ_MEM_BARRIER; if (__gnu_cxx::__exchange_and_add(&_M_use_count, -1) == 1)
_GLIBCXX_WRITE_MEM_BARRIER; {
dispose();
#ifdef __GTHREADS
_GLIBCXX_READ_MEM_BARRIER;
_GLIBCXX_WRITE_MEM_BARRIER;
#endif #endif
destroy(); if (__gnu_cxx::__exchange_and_add(&_M_weak_count, -1) == 1)
} destroy();
} }
}
long
use_count() const // nothrow
{ return _M_use_count; } // XXX is this MT safe?
private: void
_Sp_counted_base(_Sp_counted_base const&); weak_add_ref() // nothrow
_Sp_counted_base& operator=(_Sp_counted_base const&); { __gnu_cxx::__atomic_add(&_M_weak_count, 1); }
_Atomic_word _M_use_count; // #shared void
_Atomic_word _M_weak_count; // #weak + (#shared != 0) weak_release() // nothrow
};
template<>
inline void
_Sp_counted_base<_S_single>::add_ref_lock()
{
if (__gnu_cxx::__exchange_and_add(&_M_use_count, 1) == 0)
{ {
_M_use_count = 0; if (__gnu_cxx::__exchange_and_add(&_M_weak_count, -1) == 1)
__throw_bad_weak_ptr(); {
#ifdef __GTHREADS
_GLIBCXX_READ_MEM_BARRIER;
_GLIBCXX_WRITE_MEM_BARRIER;
#endif
destroy();
}
} }
}
long
use_count() const // nothrow
{ return _M_use_count; } // XXX is this MT safe?
private:
_Sp_counted_base(_Sp_counted_base const&);
_Sp_counted_base& operator=(_Sp_counted_base const&);
_Atomic_word _M_use_count; // #shared
_Atomic_word _M_weak_count; // #weak + (#shared != 0)
};
template<>
inline void
_Sp_counted_base<_S_single>::add_ref_lock()
{
if (__gnu_cxx::__exchange_and_add(&_M_use_count, 1) == 0)
{
_M_use_count = 0;
__throw_bad_weak_ptr();
}
}
#ifdef __GTHREADS #ifdef __GTHREADS
template<> template<>
inline void inline void
_Sp_counted_base<_S_mutex>::add_ref_lock() _Sp_counted_base<_S_mutex>::add_ref_lock()
{ {
__gnu_cxx::__scoped_lock sentry(*this); __gnu_cxx::__scoped_lock sentry(*this);
if (__gnu_cxx::__exchange_and_add(&_M_use_count, 1) == 0) if (__gnu_cxx::__exchange_and_add(&_M_use_count, 1) == 0)
{ {
_M_use_count = 0; _M_use_count = 0;
__throw_bad_weak_ptr(); __throw_bad_weak_ptr();
} }
} }
#endif #endif
template<> template<>
inline void inline void
_Sp_counted_base<_S_atomic>::add_ref_lock() _Sp_counted_base<_S_atomic>::add_ref_lock()
{
// Perform lock-free add-if-not-zero operation.
_Atomic_word __count;
do
{ {
__count = _M_use_count; // Perform lock-free add-if-not-zero operation.
if (__count == 0) _Atomic_word __count;
__throw_bad_weak_ptr(); do
{
// Replace the current counter value with the old value + 1, as __count = _M_use_count;
// long as it's not changed meanwhile. if (__count == 0)
__throw_bad_weak_ptr();
// Replace the current counter value with the old value + 1, as
// long as it's not changed meanwhile.
}
while (!__sync_bool_compare_and_swap(&_M_use_count, __count,
__count + 1));
} }
while (!__sync_bool_compare_and_swap(&_M_use_count, __count, __count + 1));
}
template<typename _Ptr, typename _Deleter, _Lock_policy _Lp> template<typename _Ptr, typename _Deleter, _Lock_policy _Lp>
class _Sp_counted_base_impl : public _Sp_counted_base<_Lp> class _Sp_counted_base_impl : public _Sp_counted_base<_Lp>
{ {
public: public:
/** /**
* @brief * @brief
* @pre d(p) must not throw. * @pre d(p) must not throw.
*/ */
_Sp_counted_base_impl(_Ptr __p, _Deleter __d) _Sp_counted_base_impl(_Ptr __p, _Deleter __d)
: _M_ptr(__p), _M_del(__d) { } : _M_ptr(__p), _M_del(__d) { }
virtual void
dispose() // nothrow
{ _M_del(_M_ptr); }
virtual void*
get_deleter(const std::type_info& __ti)
{ return __ti == typeid(_Deleter) ? &_M_del : 0; }
private:
_Sp_counted_base_impl(const _Sp_counted_base_impl&);
_Sp_counted_base_impl& operator=(const _Sp_counted_base_impl&);
_Ptr _M_ptr; // copy constructor must not throw virtual void
_Deleter _M_del; // copy constructor must not throw dispose() // nothrow
}; { _M_del(_M_ptr); }
virtual void*
get_deleter(const std::type_info& __ti)
{ return __ti == typeid(_Deleter) ? &_M_del : 0; }
private:
_Sp_counted_base_impl(const _Sp_counted_base_impl&);
_Sp_counted_base_impl& operator=(const _Sp_counted_base_impl&);
_Ptr _M_ptr; // copy constructor must not throw
_Deleter _M_del; // copy constructor must not throw
};
template<_Lock_policy _Lp = __default_lock_policy> template<_Lock_policy _Lp = __default_lock_policy>
class weak_count; class weak_count;
template<_Lock_policy _Lp = __default_lock_policy> template<_Lock_policy _Lp = __default_lock_policy>
class shared_count class shared_count
{
private:
_Sp_counted_base<_Lp>* _M_pi;
friend class weak_count<_Lp>;
public:
shared_count() : _M_pi(0) // nothrow
{ }
template<typename _Ptr, typename _Deleter>
shared_count(_Ptr __p, _Deleter __d) : _M_pi(0)
{
try
{
_M_pi = new _Sp_counted_base_impl<_Ptr, _Deleter, _Lp>(__p, __d);
}
catch(...)
{
__d(__p); // Call _Deleter on __p.
__throw_exception_again;
}
}
// Special case for auto_ptr<_Tp> to provide the strong guarantee.
template<typename _Tp>
explicit shared_count(std::auto_ptr<_Tp>& __r)
: _M_pi(new _Sp_counted_base_impl<_Tp*,
_Sp_deleter<_Tp>, _Lp >(__r.get(), _Sp_deleter<_Tp>()))
{ __r.release(); }
// Throw bad_weak_ptr when __r.use_count() == 0.
explicit shared_count(const weak_count<_Lp>& __r);
~shared_count() // nothrow
{
if (_M_pi != 0)
_M_pi->release();
}
shared_count(const shared_count& __r)
: _M_pi(__r._M_pi) // nothrow
{
if (_M_pi != 0)
_M_pi->add_ref_copy();
}
shared_count&
operator=(const shared_count& __r) // nothrow
{ {
_Sp_counted_base<_Lp>* __tmp = __r._M_pi; private:
if (__tmp != _M_pi) _Sp_counted_base<_Lp>* _M_pi;
{
if (__tmp != 0)
__tmp->add_ref_copy();
if (_M_pi != 0)
_M_pi->release();
_M_pi = __tmp;
}
return *this;
}
void swap(shared_count& __r) // nothrow friend class weak_count<_Lp>;
{
_Sp_counted_base<_Lp>* __tmp = __r._M_pi;
__r._M_pi = _M_pi;
_M_pi = __tmp;
}
long public:
use_count() const // nothrow shared_count() : _M_pi(0) // nothrow
{ return _M_pi != 0 ? _M_pi->use_count() : 0; } { }
bool template<typename _Ptr, typename _Deleter>
unique() const // nothrow shared_count(_Ptr __p, _Deleter __d) : _M_pi(0)
{ return this->use_count() == 1; } {
try
{
_M_pi = new _Sp_counted_base_impl<_Ptr, _Deleter, _Lp>(__p, __d);
}
catch(...)
{
__d(__p); // Call _Deleter on __p.
__throw_exception_again;
}
}
// Special case for auto_ptr<_Tp> to provide the strong guarantee.
template<typename _Tp>
explicit
shared_count(std::auto_ptr<_Tp>& __r)
: _M_pi(new _Sp_counted_base_impl<_Tp*,
_Sp_deleter<_Tp>, _Lp >(__r.get(), _Sp_deleter<_Tp>()))
{ __r.release(); }
friend inline bool // Throw bad_weak_ptr when __r.use_count() == 0.
operator==(const shared_count& __a, const shared_count& __b) explicit shared_count(const weak_count<_Lp>& __r);
{ return __a._M_pi == __b._M_pi; }
friend inline bool ~shared_count() // nothrow
operator<(const shared_count& __a, const shared_count& __b) {
{ return std::less<_Sp_counted_base<_Lp>*>()(__a._M_pi, __b._M_pi); } if (_M_pi != 0)
_M_pi->release();
}
shared_count(const shared_count& __r)
: _M_pi(__r._M_pi) // nothrow
{
if (_M_pi != 0)
_M_pi->add_ref_copy();
}
void* shared_count&
get_deleter(const std::type_info& __ti) const operator=(const shared_count& __r) // nothrow
{ return _M_pi ? _M_pi->get_deleter(__ti) : 0; } {
}; _Sp_counted_base<_Lp>* __tmp = __r._M_pi;
if (__tmp != _M_pi)
template<_Lock_policy _Lp> {
class weak_count if (__tmp != 0)
{ __tmp->add_ref_copy();
private: if (_M_pi != 0)
_Sp_counted_base<_Lp>* _M_pi; _M_pi->release();
_M_pi = __tmp;
}
return *this;
}
friend class shared_count<_Lp>; void
swap(shared_count& __r) // nothrow
{
_Sp_counted_base<_Lp>* __tmp = __r._M_pi;
__r._M_pi = _M_pi;
_M_pi = __tmp;
}
public: long
weak_count() use_count() const // nothrow
: _M_pi(0) // nothrow { return _M_pi != 0 ? _M_pi->use_count() : 0; }
{ }
bool
unique() const // nothrow
{ return this->use_count() == 1; }
friend inline bool
operator==(const shared_count& __a, const shared_count& __b)
{ return __a._M_pi == __b._M_pi; }
weak_count(const shared_count<_Lp>& __r) friend inline bool
: _M_pi(__r._M_pi) // nothrow operator<(const shared_count& __a, const shared_count& __b)
{ { return std::less<_Sp_counted_base<_Lp>*>()(__a._M_pi, __b._M_pi); }
if (_M_pi != 0)
_M_pi->weak_add_ref();
}
weak_count(const weak_count<_Lp>& __r) void*
: _M_pi(__r._M_pi) // nothrow get_deleter(const std::type_info& __ti) const
{ return _M_pi ? _M_pi->get_deleter(__ti) : 0; }
};
template<_Lock_policy _Lp>
class weak_count
{ {
if (_M_pi != 0) private:
_M_pi->weak_add_ref(); _Sp_counted_base<_Lp>* _M_pi;
}
friend class shared_count<_Lp>;
public:
weak_count()
: _M_pi(0) // nothrow
{ }
~weak_count() // nothrow weak_count(const shared_count<_Lp>& __r)
{ : _M_pi(__r._M_pi) // nothrow
if (_M_pi != 0) {
_M_pi->weak_release(); if (_M_pi != 0)
} _M_pi->weak_add_ref();
}
weak_count(const weak_count<_Lp>& __r)
: _M_pi(__r._M_pi) // nothrow
{
if (_M_pi != 0)
_M_pi->weak_add_ref();
}
~weak_count() // nothrow
{
if (_M_pi != 0)
_M_pi->weak_release();
}
weak_count<_Lp>&
operator=(const shared_count<_Lp>& __r) // nothrow
{
_Sp_counted_base<_Lp>* __tmp = __r._M_pi;
if (__tmp != 0)
__tmp->weak_add_ref();
if (_M_pi != 0)
_M_pi->weak_release();
_M_pi = __tmp;
return *this;
}
weak_count<_Lp>&
operator=(const weak_count<_Lp>& __r) // nothrow
{
_Sp_counted_base<_Lp> * __tmp = __r._M_pi;
if (__tmp != 0)
__tmp->weak_add_ref();
if (_M_pi != 0)
_M_pi->weak_release();
_M_pi = __tmp;
return *this;
}
weak_count<_Lp>& void
operator=(const shared_count<_Lp>& __r) // nothrow swap(weak_count<_Lp>& __r) // nothrow
{ {
_Sp_counted_base<_Lp>* __tmp = __r._M_pi; _Sp_counted_base<_Lp> * __tmp = __r._M_pi;
if (__tmp != 0) __r._M_pi = _M_pi;
__tmp->weak_add_ref(); _M_pi = __tmp;
if (_M_pi != 0) }
_M_pi->weak_release();
_M_pi = __tmp;
return *this;
}
weak_count<_Lp>& long
operator=(const weak_count<_Lp>& __r) // nothrow use_count() const // nothrow
{ return _M_pi != 0 ? _M_pi->use_count() : 0; }
friend inline bool
operator==(const weak_count<_Lp>& __a, const weak_count<_Lp>& __b)
{ return __a._M_pi == __b._M_pi; }
friend inline bool
operator<(const weak_count<_Lp>& __a, const weak_count<_Lp>& __b)
{ return std::less<_Sp_counted_base<_Lp>*>()(__a._M_pi, __b._M_pi); }
};
template<_Lock_policy _Lp>
inline
shared_count<_Lp>::
shared_count(const weak_count<_Lp>& __r)
: _M_pi(__r._M_pi)
{ {
_Sp_counted_base<_Lp> * __tmp = __r._M_pi;
if (__tmp != 0)
__tmp->weak_add_ref();
if (_M_pi != 0) if (_M_pi != 0)
_M_pi->weak_release(); _M_pi->add_ref_lock();
_M_pi = __tmp; else
return *this; __throw_bad_weak_ptr();
}
void
swap(weak_count<_Lp>& __r) // nothrow
{
_Sp_counted_base<_Lp> * __tmp = __r._M_pi;
__r._M_pi = _M_pi;
_M_pi = __tmp;
} }
long
use_count() const // nothrow // Forward decls.
{ return _M_pi != 0 ? _M_pi->use_count() : 0; } template<typename _Tp, _Lock_policy _Lp = __default_lock_policy>
class __shared_ptr;
friend inline bool
operator==(const weak_count<_Lp>& __a, const weak_count<_Lp>& __b)
{ return __a._M_pi == __b._M_pi; }
friend inline bool template<typename _Tp, _Lock_policy _Lp = __default_lock_policy>
operator<(const weak_count<_Lp>& __a, const weak_count<_Lp>& __b) class __weak_ptr;
{ return std::less<_Sp_counted_base<_Lp>*>()(__a._M_pi, __b._M_pi); }
};
template<_Lock_policy _Lp> template<typename _Tp, _Lock_policy _Lp>
inline class __enable_shared_from_this;
shared_count<_Lp>::shared_count(const weak_count<_Lp>& __r)
: _M_pi(__r._M_pi)
{
if (_M_pi != 0)
_M_pi->add_ref_lock();
else
__throw_bad_weak_ptr();
}
struct __static_cast_tag { };
struct __const_cast_tag { };
struct __dynamic_cast_tag { };
struct __polymorphic_cast_tag { };
// Forward decls. template<class _Tp>
template<typename _Tp, _Lock_policy _Lp = __default_lock_policy> struct __shared_ptr_reference
class __shared_ptr; { typedef _Tp& __type; };
template<typename _Tp, _Lock_policy _Lp = __default_lock_policy> template<>
class __weak_ptr; struct __shared_ptr_reference<void>
{ typedef void __type; };
template<typename _Tp, _Lock_policy _Lp> template<>
class __enable_shared_from_this; struct __shared_ptr_reference<void const>
{ typedef void __type; };
struct __static_cast_tag { }; template<>
struct __const_cast_tag { }; struct __shared_ptr_reference<void volatile>
struct __dynamic_cast_tag { }; { typedef void __type; };
struct __polymorphic_cast_tag { };
template<class _Tp> template<>
struct shared_ptr_traits struct __shared_ptr_reference<void const volatile>
{ typedef _Tp& reference; }; { typedef void __type; };
template<>
struct shared_ptr_traits<void>
{ typedef void reference; };
template<> // Support for enable_shared_from_this.
struct shared_ptr_traits<void const>
{ typedef void reference; };
template<> // Friend of __enable_shared_from_this.
struct shared_ptr_traits<void volatile> template<_Lock_policy _Lp, typename _Tp1, typename _Tp2>
{ typedef void reference; }; void
__enable_shared_from_this_helper(const shared_count<_Lp>&,
const __enable_shared_from_this<_Tp1,
_Lp>*, const _Tp2*);
template<> template<_Lock_policy _Lp>
struct shared_ptr_traits<void const volatile> inline void
{ typedef void reference; }; __enable_shared_from_this_helper(const shared_count<_Lp>&, ...)
{ }
// Support for enable_shared_from_this. /**
* @class shared_ptr <tr1/memory>
*
* A smart pointer with reference-counted copy semantics.
* The object pointed to is deleted when the last shared_ptr pointing to
* it is destroyed or reset.
*/
template<typename _Tp, _Lock_policy _Lp>
class __shared_ptr
{
typedef typename __shared_ptr_reference<_Tp>::__type _Reference;
// Friend of __enable_shared_from_this. public:
template<_Lock_policy _Lp, typename _Tp1, typename _Tp2> typedef _Tp element_type;
void
__enable_shared_from_this_helper(const shared_count<_Lp>&, /** @brief Construct an empty %__shared_ptr.
const __enable_shared_from_this<_Tp1, _Lp>*, * @post use_count()==0 && get()==0
const _Tp2*); */
__shared_ptr()
: _M_ptr(0), _M_refcount() // never throws
{ }
template<_Lock_policy _Lp> /** @brief Construct a %__shared_ptr that owns the pointer @a p.
inline void * @param p A pointer that is convertible to element_type*.
__enable_shared_from_this_helper(const shared_count<_Lp>&, ...) * @post use_count() == 1 && get() == p
{ } * @throw std::bad_alloc, in which case @c delete @a p is called.
*/
template<typename _Tp1>
explicit
__shared_ptr(_Tp1* __p)
: _M_ptr(__p), _M_refcount(__p, _Sp_deleter<_Tp1>())
{
__glibcxx_function_requires(_ConvertibleConcept<_Tp1*, _Tp*>)
// __glibcxx_function_requires(_CompleteConcept<_Tp1*>)
__enable_shared_from_this_helper( _M_refcount, __p, __p );
}
//
// Requirements: D's copy constructor and destructor must not throw
//
// __shared_ptr will release p by calling d(p)
//
/** @brief Construct a %__shared_ptr that owns the pointer @a p
* and the deleter @a d.
* @param p A pointer.
* @param d A deleter.
* @post use_count() == 1 && get() == p
* @throw std::bad_alloc, in which case @a d(p) is called.
*/
template<typename _Tp1, typename _Deleter>
__shared_ptr(_Tp1* __p, _Deleter __d)
: _M_ptr(__p), _M_refcount(__p, __d)
{
__glibcxx_function_requires(_ConvertibleConcept<_Tp1*, _Tp*>)
// TODO requires D is CopyConstructible and d(p) well-formed
__enable_shared_from_this_helper( _M_refcount, __p, __p );
}
// generated copy constructor, assignment, destructor are fine.
/** @brief If @a r is empty, constructs an empty %__shared_ptr;
* otherwise construct a %__shared_ptr that shares ownership
* with @a r.
* @param r A %__shared_ptr.
* @post get() == r.get() && use_count() == r.use_count()
* @throw std::bad_alloc, in which case
*/
template<typename _Tp1>
__shared_ptr(const __shared_ptr<_Tp1, _Lp>& __r)
: _M_ptr(__r._M_ptr), _M_refcount(__r._M_refcount) // never throws
{ __glibcxx_function_requires(_ConvertibleConcept<_Tp1*, _Tp*>) }
/** @brief Constructs a %__shared_ptr that shares ownership with @a r
* and stores a copy of the pointer stored in @a r.
* @param r A weak_ptr.
* @post use_count() == r.use_count()
* @throw bad_weak_ptr when r.expired(),
* in which case the constructor has no effect.
*/
template<typename _Tp1>
explicit
__shared_ptr(const __weak_ptr<_Tp1, _Lp>& __r)
: _M_refcount(__r._M_refcount) // may throw
{
__glibcxx_function_requires(_ConvertibleConcept<_Tp1*, _Tp*>)
// It is now safe to copy r__._M_ptr, as _M_refcount(__r._M_refcount)
// did not throw.
_M_ptr = __r._M_ptr;
}
/** /**
* @class shared_ptr <tr1/memory> * @post use_count() == 1 and r.get() == 0
* */
* A smart pointer with reference-counted copy semantics. template<typename _Tp1>
* The object pointed to is deleted when the last shared_ptr pointing to it explicit
* is destroyed or reset. __shared_ptr(std::auto_ptr<_Tp1>& __r)
*/ : _M_ptr(__r.get()), _M_refcount()
template<typename _Tp, _Lock_policy _Lp> {
class __shared_ptr // TODO requires r.release() convertible to _Tp*, Tp1 is complete,
{ // delete r.release() well-formed
typedef typename shared_ptr_traits<_Tp>::reference _Reference; _Tp1 * __tmp = __r.get();
_M_refcount = shared_count<_Lp>(__r);
__enable_shared_from_this_helper( _M_refcount, __tmp, __tmp );
}
public: template<typename _Tp1>
typedef _Tp element_type; __shared_ptr(const __shared_ptr<_Tp1, _Lp>& __r, __static_cast_tag)
: _M_ptr(static_cast<element_type*>(__r._M_ptr)),
_M_refcount(__r._M_refcount)
{ }
template<typename _Tp1>
__shared_ptr(const __shared_ptr<_Tp1, _Lp>& __r, __const_cast_tag)
: _M_ptr(const_cast<element_type*>(__r._M_ptr)),
_M_refcount(__r._M_refcount)
{ }
template<typename _Tp1>
__shared_ptr(const __shared_ptr<_Tp1, _Lp>& __r, __dynamic_cast_tag)
: _M_ptr(dynamic_cast<element_type*>(__r._M_ptr)),
_M_refcount(__r._M_refcount)
{
if (_M_ptr == 0) // need to allocate new counter -- the cast failed
_M_refcount = shared_count<_Lp>();
}
template<typename _Tp1>
__shared_ptr&
operator=(const __shared_ptr<_Tp1, _Lp>& __r) // never throws
{
_M_ptr = __r._M_ptr;
_M_refcount = __r._M_refcount; // shared_count::op= doesn't throw
return *this;
}
/** @brief Construct an empty %__shared_ptr. template<typename _Tp1>
* @post use_count()==0 && get()==0 __shared_ptr&
*/ operator=(std::auto_ptr<_Tp1>& __r)
__shared_ptr() {
: _M_ptr(0), _M_refcount() // never throws __shared_ptr(__r).swap(*this);
{ } return *this;
}
/** @brief Construct a %__shared_ptr that owns the pointer @a p. void
* @param p A pointer that is convertible to element_type*. reset() // never throws
* @post use_count() == 1 && get() == p { __shared_ptr().swap(*this); }
* @throw std::bad_alloc, in which case @c delete @a p is called.
*/
template<typename _Tp1>
explicit __shared_ptr(_Tp1* __p)
: _M_ptr(__p), _M_refcount(__p, _Sp_deleter<_Tp1>())
{
__glibcxx_function_requires(_ConvertibleConcept<_Tp1*, _Tp*>)
// __glibcxx_function_requires(_CompleteConcept<_Tp1*>)
__enable_shared_from_this_helper( _M_refcount, __p, __p );
}
// template<typename _Tp1>
// Requirements: D's copy constructor and destructor must not throw void
// reset(_Tp1* __p) // _Tp1 must be complete.
// __shared_ptr will release p by calling d(p) {
// // Catch self-reset errors.
/** @brief Construct a %__shared_ptr that owns the pointer @a p _GLIBCXX_DEBUG_ASSERT(__p == 0 || __p != _M_ptr);
* and the deleter @a d. __shared_ptr(__p).swap(*this);
* @param p A pointer. }
* @param d A deleter.
* @post use_count() == 1 && get() == p
* @throw std::bad_alloc, in which case @a d(p) is called.
*/
template<typename _Tp1, typename _Deleter>
__shared_ptr(_Tp1* __p, _Deleter __d)
: _M_ptr(__p), _M_refcount(__p, __d)
{
__glibcxx_function_requires(_ConvertibleConcept<_Tp1*, _Tp*>)
// TODO requires D is CopyConstructible and d(p) well-formed
__enable_shared_from_this_helper( _M_refcount, __p, __p );
}
// generated copy constructor, assignment, destructor are fine. template<typename _Tp1, typename _Deleter>
void
/** @brief If @a r is empty, constructs an empty %__shared_ptr; otherwise reset(_Tp1 * __p, _Deleter __d)
* construct a %__shared_ptr that shares ownership with @a r. { __shared_ptr(__p, __d).swap(*this); }
* @param r A %__shared_ptr.
* @post get() == r.get() && use_count() == r.use_count()
* @throw std::bad_alloc, in which case
*/
template<typename _Tp1>
__shared_ptr(const __shared_ptr<_Tp1, _Lp>& __r)
: _M_ptr(__r._M_ptr), _M_refcount(__r._M_refcount) // never throws
{ __glibcxx_function_requires(_ConvertibleConcept<_Tp1*, _Tp*>) }
/** @brief Constructs a %__shared_ptr that shares ownership with @a r
* and stores a copy of the pointer stored in @a r.
* @param r A weak_ptr.
* @post use_count() == r.use_count()
* @throw bad_weak_ptr when r.expired(),
* in which case the constructor has no effect.
*/
template<typename _Tp1>
explicit __shared_ptr(const __weak_ptr<_Tp1, _Lp>& __r)
: _M_refcount(__r._M_refcount) // may throw
{
__glibcxx_function_requires(_ConvertibleConcept<_Tp1*, _Tp*>)
// It is now safe to copy r__._M_ptr, as _M_refcount(__r._M_refcount)
// did not throw.
_M_ptr = __r._M_ptr;
}
/** // Error to instantiate if _Tp is [cv-qual] void.
* @post use_count() == 1 and r.get() == 0 _Reference
*/ operator*() const // never throws
template<typename _Tp1>
explicit __shared_ptr(std::auto_ptr<_Tp1>& __r)
: _M_ptr(__r.get()), _M_refcount()
{ {
// TODO requires r.release() convertible to _Tp*, Tp1 is complete, _GLIBCXX_DEBUG_ASSERT(_M_ptr != 0);
// delete r.release() well-formed return *_M_ptr;
_Tp1 * __tmp = __r.get();
_M_refcount = shared_count<_Lp>(__r);
__enable_shared_from_this_helper( _M_refcount, __tmp, __tmp );
} }
template<typename _Tp1> _Tp*
__shared_ptr(const __shared_ptr<_Tp1, _Lp>& __r, __static_cast_tag) operator->() const // never throws
: _M_ptr(static_cast<element_type*>(__r._M_ptr)),
_M_refcount(__r._M_refcount)
{ }
template<typename _Tp1>
__shared_ptr(const __shared_ptr<_Tp1, _Lp>& __r, __const_cast_tag)
: _M_ptr(const_cast<element_type*>(__r._M_ptr)),
_M_refcount(__r._M_refcount)
{ }
template<typename _Tp1>
__shared_ptr(const __shared_ptr<_Tp1, _Lp>& __r, __dynamic_cast_tag)
: _M_ptr(dynamic_cast<element_type*>(__r._M_ptr)),
_M_refcount(__r._M_refcount)
{ {
if (_M_ptr == 0) // need to allocate new counter -- the cast failed _GLIBCXX_DEBUG_ASSERT(_M_ptr != 0);
_M_refcount = shared_count<_Lp>(); return _M_ptr;
} }
_Tp*
get() const // never throws
{ return _M_ptr; }
template<typename _Tp1> // Implicit conversion to "bool"
__shared_ptr& private:
operator=(const __shared_ptr<_Tp1, _Lp>& __r) // never throws typedef _Tp* __shared_ptr::*__unspecified_bool_type;
{
_M_ptr = __r._M_ptr;
_M_refcount = __r._M_refcount; // shared_count::op= doesn't throw
return *this;
}
template<typename _Tp1> public:
__shared_ptr& operator __unspecified_bool_type() const // never throws
operator=(std::auto_ptr<_Tp1>& __r) { return _M_ptr == 0 ? 0 : &__shared_ptr::_M_ptr; }
{
__shared_ptr(__r).swap(*this);
return *this;
}
void bool
reset() // never throws unique() const // never throws
{ __shared_ptr().swap(*this); } { return _M_refcount.unique(); }
long
use_count() const // never throws
{ return _M_refcount.use_count(); }
template<typename _Tp1>
void void
reset(_Tp1* __p) // _Tp1 must be complete. swap(__shared_ptr<_Tp, _Lp>& __other) // never throws
{ {
// Catch self-reset errors. std::swap(_M_ptr, __other._M_ptr);
_GLIBCXX_DEBUG_ASSERT(__p == 0 || __p != _M_ptr); _M_refcount.swap(__other._M_refcount);
__shared_ptr(__p).swap(*this);
} }
template<typename _Tp1, typename _Deleter> private:
void void*
reset(_Tp1 * __p, _Deleter __d) _M_get_deleter(const std::type_info& __ti) const
{ __shared_ptr(__p, __d).swap(*this); } { return _M_refcount.get_deleter(__ti); }
// Error to instantiate if _Tp is [cv-qual] void. template<typename _Tp1, _Lock_policy _Lp1>
_Reference bool
operator*() const // never throws _M_less(const __shared_ptr<_Tp1, _Lp1>& __rhs) const
{ { return _M_refcount < __rhs._M_refcount; }
_GLIBCXX_DEBUG_ASSERT(_M_ptr != 0);
return *_M_ptr; template<typename _Tp1, _Lock_policy _Lp1> friend class __shared_ptr;
} template<typename _Tp1, _Lock_policy _Lp1> friend class __weak_ptr;
_Tp* template<typename _Del, typename _Tp1, _Lock_policy _Lp1>
operator->() const // never throws friend _Del* get_deleter(const __shared_ptr<_Tp1, _Lp1>&);
// Friends injected into enclosing namespace and found by ADL:
template<typename _Tp1>
friend inline bool
operator==(const __shared_ptr& __a, const __shared_ptr<_Tp1, _Lp>& __b)
{ return __a.get() == __b.get(); }
template<typename _Tp1>
friend inline bool
operator!=(const __shared_ptr& __a, const __shared_ptr<_Tp1, _Lp>& __b)
{ return __a.get() != __b.get(); }
template<typename _Tp1>
friend inline bool
operator<(const __shared_ptr& __a, const __shared_ptr<_Tp1, _Lp>& __b)
{ return __a._M_less(__b); }
_Tp* _M_ptr; // Contained pointer.
shared_count<_Lp> _M_refcount; // Reference counter.
};
// 2.2.3.8 shared_ptr specialized algorithms.
template<typename _Tp, _Lock_policy _Lp>
inline void
swap(__shared_ptr<_Tp, _Lp>& __a, __shared_ptr<_Tp, _Lp>& __b)
{ __a.swap(__b); }
// 2.2.3.9 shared_ptr casts
/** @warning The seemingly equivalent
* <code>shared_ptr<T>(static_cast<T*>(r.get()))</code>
* will eventually result in undefined behaviour,
* attempting to delete the same object twice.
*/
template<typename _Tp, typename _Tp1, _Lock_policy _Lp>
__shared_ptr<_Tp, _Lp>
static_pointer_cast(const __shared_ptr<_Tp1, _Lp>& __r)
{ return __shared_ptr<_Tp, _Lp>(__r, __static_cast_tag()); }
/** @warning The seemingly equivalent
* <code>shared_ptr<T>(const_cast<T*>(r.get()))</code>
* will eventually result in undefined behaviour,
* attempting to delete the same object twice.
*/
template<typename _Tp, typename _Tp1, _Lock_policy _Lp>
__shared_ptr<_Tp, _Lp>
const_pointer_cast(const __shared_ptr<_Tp1, _Lp>& __r)
{ return __shared_ptr<_Tp, _Lp>(__r, __const_cast_tag()); }
/** @warning The seemingly equivalent
* <code>shared_ptr<T>(dynamic_cast<T*>(r.get()))</code>
* will eventually result in undefined behaviour,
* attempting to delete the same object twice.
*/
template<typename _Tp, typename _Tp1, _Lock_policy _Lp>
__shared_ptr<_Tp, _Lp>
dynamic_pointer_cast(const __shared_ptr<_Tp1, _Lp>& __r)
{ return __shared_ptr<_Tp, _Lp>(__r, __dynamic_cast_tag()); }
// 2.2.3.7 shared_ptr I/O
template<typename _Ch, typename _Tr, typename _Tp, _Lock_policy _Lp>
std::basic_ostream<_Ch, _Tr>&
operator<<(std::basic_ostream<_Ch, _Tr>& __os,
const __shared_ptr<_Tp, _Lp>& __p)
{ {
_GLIBCXX_DEBUG_ASSERT(_M_ptr != 0); __os << __p.get();
return _M_ptr; return __os;
} }
_Tp*
get() const // never throws
{ return _M_ptr; }
// Implicit conversion to "bool"
private:
typedef _Tp* __shared_ptr::*__unspecified_bool_type;
public:
operator __unspecified_bool_type() const // never throws
{ return _M_ptr == 0 ? 0 : &__shared_ptr::_M_ptr; }
bool // 2.2.3.10 shared_ptr get_deleter (experimental)
unique() const // never throws template<typename _Del, typename _Tp, _Lock_policy _Lp>
{ return _M_refcount.unique(); } inline _Del*
get_deleter(const __shared_ptr<_Tp, _Lp>& __p)
{ return static_cast<_Del*>(__p._M_get_deleter(typeid(_Del))); }
long
use_count() const // never throws
{ return _M_refcount.use_count(); }
void template<typename _Tp, _Lock_policy _Lp>
swap(__shared_ptr<_Tp, _Lp>& __other) // never throws class __weak_ptr
{ {
std::swap(_M_ptr, __other._M_ptr); public:
_M_refcount.swap(__other._M_refcount); typedef _Tp element_type;
}
__weak_ptr() : _M_ptr(0), _M_refcount() // never throws
private: { }
void*
_M_get_deleter(const std::type_info& __ti) const
{ return _M_refcount.get_deleter(__ti); }
template<typename _Tp1, _Lock_policy _Lp1>
bool
_M_less(const __shared_ptr<_Tp1, _Lp1>& __rhs) const
{ return _M_refcount < __rhs._M_refcount; }
template<typename _Tp1, _Lock_policy _Lp1> friend class __shared_ptr;
template<typename _Tp1, _Lock_policy _Lp1> friend class __weak_ptr;
template<typename _Del, typename _Tp1, _Lock_policy _Lp1>
friend _Del* get_deleter(const __shared_ptr<_Tp1, _Lp1>&);
// Friends injected into enclosing namespace and found by ADL:
template<typename _Tp1>
friend inline bool
operator==(const __shared_ptr& __a, const __shared_ptr<_Tp1, _Lp>& __b)
{ return __a.get() == __b.get(); }
template<typename _Tp1>
friend inline bool
operator!=(const __shared_ptr& __a, const __shared_ptr<_Tp1, _Lp>& __b)
{ return __a.get() != __b.get(); }
template<typename _Tp1>
friend inline bool
operator<(const __shared_ptr& __a, const __shared_ptr<_Tp1, _Lp>& __b)
{ return __a._M_less(__b); }
_Tp* _M_ptr; // Contained pointer.
shared_count<_Lp> _M_refcount; // Reference counter.
};
// 2.2.3.8 shared_ptr specialized algorithms.
template<typename _Tp, _Lock_policy _Lp>
inline void
swap(__shared_ptr<_Tp, _Lp>& __a, __shared_ptr<_Tp, _Lp>& __b)
{ __a.swap(__b); }
// 2.2.3.9 shared_ptr casts
/** @warning The seemingly equivalent
* <code>shared_ptr<T>(static_cast<T*>(r.get()))</code>
* will eventually result in undefined behaviour,
* attempting to delete the same object twice.
*/
template<typename _Tp, typename _Tp1, _Lock_policy _Lp>
__shared_ptr<_Tp, _Lp>
static_pointer_cast(const __shared_ptr<_Tp1, _Lp>& __r)
{ return __shared_ptr<_Tp, _Lp>(__r, __static_cast_tag()); }
/** @warning The seemingly equivalent
* <code>shared_ptr<T>(const_cast<T*>(r.get()))</code>
* will eventually result in undefined behaviour,
* attempting to delete the same object twice.
*/
template<typename _Tp, typename _Tp1, _Lock_policy _Lp>
__shared_ptr<_Tp, _Lp>
const_pointer_cast(const __shared_ptr<_Tp1, _Lp>& __r)
{ return __shared_ptr<_Tp, _Lp>(__r, __const_cast_tag()); }
/** @warning The seemingly equivalent
* <code>shared_ptr<T>(dynamic_cast<T*>(r.get()))</code>
* will eventually result in undefined behaviour,
* attempting to delete the same object twice.
*/
template<typename _Tp, typename _Tp1, _Lock_policy _Lp>
__shared_ptr<_Tp, _Lp>
dynamic_pointer_cast(const __shared_ptr<_Tp1, _Lp>& __r)
{ return __shared_ptr<_Tp, _Lp>(__r, __dynamic_cast_tag()); }
// 2.2.3.7 shared_ptr I/O
template<typename _Ch, typename _Tr, typename _Tp, _Lock_policy _Lp>
std::basic_ostream<_Ch, _Tr>&
operator<<(std::basic_ostream<_Ch, _Tr>& __os,
const __shared_ptr<_Tp, _Lp>& __p)
{
__os << __p.get();
return __os;
}
// 2.2.3.10 shared_ptr get_deleter (experimental)
template<typename _Del, typename _Tp, _Lock_policy _Lp>
inline _Del*
get_deleter(const __shared_ptr<_Tp, _Lp>& __p)
{ return static_cast<_Del*>(__p._M_get_deleter(typeid(_Del))); }
template<typename _Tp, _Lock_policy _Lp>
class __weak_ptr
{
public:
typedef _Tp element_type;
__weak_ptr() : _M_ptr(0), _M_refcount() // never throws
{ }
// Generated copy constructor, assignment, destructor are fine. // Generated copy constructor, assignment, destructor are fine.
// The "obvious" converting constructor implementation: // The "obvious" converting constructor implementation:
// //
// template<class Y> // template<class Y>
// __weak_ptr(__weak_ptr<Y> const & r) // __weak_ptr(__weak_ptr<Y> const & r)
// : _M_ptr(r._M_ptr), _M_refcount(r._M_refcount) // never throws // : _M_ptr(r._M_ptr), _M_refcount(r._M_refcount) // never throws
// { } // { }
// //
// has a serious problem. // has a serious problem.
// //
// r._M_ptr may already have been invalidated. The _M_ptr(r._M_ptr) // r._M_ptr may already have been invalidated. The _M_ptr(r._M_ptr)
// conversion may require access to *r._M_ptr (virtual inheritance). // conversion may require access to *r._M_ptr (virtual inheritance).
// //
// It is not possible to avoid spurious access violations since // It is not possible to avoid spurious access violations since
// in multithreaded programs r._M_ptr may be invalidated at any point. // in multithreaded programs r._M_ptr may be invalidated at any point.
template<typename _Tp1> template<typename _Tp1>
__weak_ptr(const __weak_ptr<_Tp1, _Lp>& r) __weak_ptr(const __weak_ptr<_Tp1, _Lp>& r)
: _M_refcount(r._M_refcount) // never throws : _M_refcount(r._M_refcount) // never throws
{ {
__glibcxx_function_requires(_ConvertibleConcept<_Tp1*, _Tp*>) __glibcxx_function_requires(_ConvertibleConcept<_Tp1*, _Tp*>)
_M_ptr = r.lock().get(); _M_ptr = r.lock().get();
} }
template<typename _Tp1> template<typename _Tp1>
__weak_ptr(const __shared_ptr<_Tp1, _Lp>& r) __weak_ptr(const __shared_ptr<_Tp1, _Lp>& r)
: _M_ptr(r._M_ptr), _M_refcount(r._M_refcount) // never throws : _M_ptr(r._M_ptr), _M_refcount(r._M_refcount) // never throws
{ __glibcxx_function_requires(_ConvertibleConcept<_Tp1*, _Tp*>) } { __glibcxx_function_requires(_ConvertibleConcept<_Tp1*, _Tp*>) }
template<typename _Tp1> template<typename _Tp1>
__weak_ptr& __weak_ptr&
operator=(const __weak_ptr<_Tp1, _Lp>& r) // never throws operator=(const __weak_ptr<_Tp1, _Lp>& r) // never throws
{ {
_M_ptr = r.lock().get(); _M_ptr = r.lock().get();
_M_refcount = r._M_refcount; _M_refcount = r._M_refcount;
return *this; return *this;
} }
template<typename _Tp1>
__weak_ptr&
operator=(const __shared_ptr<_Tp1, _Lp>& r) // never throws
{
_M_ptr = r._M_ptr;
_M_refcount = r._M_refcount;
return *this;
}
template<typename _Tp1> __shared_ptr<_Tp, _Lp>
__weak_ptr& lock() const // never throws
operator=(const __shared_ptr<_Tp1, _Lp>& r) // never throws
{ {
_M_ptr = r._M_ptr;
_M_refcount = r._M_refcount;
return *this;
}
__shared_ptr<_Tp, _Lp>
lock() const // never throws
{
#ifdef __GTHREADS #ifdef __GTHREADS
// Optimization: avoid throw overhead. // Optimization: avoid throw overhead.
if (expired()) if (expired())
return __shared_ptr<element_type, _Lp>(); return __shared_ptr<element_type, _Lp>();
try try
{ {
return __shared_ptr<element_type, _Lp>(*this); return __shared_ptr<element_type, _Lp>(*this);
} }
catch (const bad_weak_ptr&) catch (const bad_weak_ptr&)
{ {
// Q: How can we get here? // Q: How can we get here?
// A: Another thread may have invalidated r after the // A: Another thread may have invalidated r after the
// use_count test above. // use_count test above.
return __shared_ptr<element_type>(); return __shared_ptr<element_type>();
} }
#else #else
// Optimization: avoid try/catch overhead when single threaded. // Optimization: avoid try/catch overhead when single threaded.
return expired() ? __shared_ptr<element_type, _Lp>() return expired() ? __shared_ptr<element_type, _Lp>()
: __shared_ptr<element_type, _Lp>(*this); : __shared_ptr<element_type, _Lp>(*this);
#endif #endif
} // XXX MT } // XXX MT
long
use_count() const // never throws
{ return _M_refcount.use_count(); }
bool
expired() const // never throws
{ return _M_refcount.use_count() == 0; }
void long
reset() // never throws use_count() const // never throws
{ __weak_ptr().swap(*this); } { return _M_refcount.use_count(); }
void
swap(__weak_ptr& __s) // never throws
{
std::swap(_M_ptr, __s._M_ptr);
_M_refcount.swap(__s._M_refcount);
}
private:
template<typename _Tp1>
bool bool
_M_less(const __weak_ptr<_Tp1, _Lp>& __rhs) const expired() const // never throws
{ return _M_refcount < __rhs._M_refcount; } { return _M_refcount.use_count() == 0; }
// Used by __enable_shared_from_this. void
void reset() // never throws
_M_assign(_Tp* __ptr, const shared_count<_Lp>& __refcount) { __weak_ptr().swap(*this); }
{
_M_ptr = __ptr;
_M_refcount = __refcount;
}
// Friend injected into namespace and found by ADL.
template<typename _Tp1>
friend inline bool
operator<(const __weak_ptr& __lhs, const __weak_ptr<_Tp1, _Lp>& __rhs)
{ return __lhs._M_less(__rhs); }
template<typename _Tp1, _Lock_policy _Lp1> friend class __weak_ptr;
template<typename _Tp1, _Lock_policy _Lp1> friend class __shared_ptr;
friend class __enable_shared_from_this<_Tp, _Lp>;
_Tp* _M_ptr; // Contained pointer.
weak_count<_Lp> _M_refcount; // Reference counter.
};
// 2.2.4.7 weak_ptr specialized algorithms.
template<typename _Tp, _Lock_policy _Lp>
void
swap(__weak_ptr<_Tp, _Lp>& __a, __weak_ptr<_Tp, _Lp>& __b)
{ __a.swap(__b); }
void
swap(__weak_ptr& __s) // never throws
{
std::swap(_M_ptr, __s._M_ptr);
_M_refcount.swap(__s._M_refcount);
}
template<typename _Tp, _Lock_policy _Lp = __default_lock_policy> private:
class __enable_shared_from_this template<typename _Tp1>
{ bool
protected: _M_less(const __weak_ptr<_Tp1, _Lp>& __rhs) const
__enable_shared_from_this() { } { return _M_refcount < __rhs._M_refcount; }
__enable_shared_from_this(const __enable_shared_from_this&) { } // Used by __enable_shared_from_this.
void
_M_assign(_Tp* __ptr, const shared_count<_Lp>& __refcount)
{
_M_ptr = __ptr;
_M_refcount = __refcount;
}
__enable_shared_from_this& // Friend injected into namespace and found by ADL.
operator=(const __enable_shared_from_this&) template<typename _Tp1>
{ return *this; } friend inline bool
operator<(const __weak_ptr& __lhs, const __weak_ptr<_Tp1, _Lp>& __rhs)
{ return __lhs._M_less(__rhs); }
template<typename _Tp1, _Lock_policy _Lp1> friend class __weak_ptr;
template<typename _Tp1, _Lock_policy _Lp1> friend class __shared_ptr;
friend class __enable_shared_from_this<_Tp, _Lp>;
_Tp* _M_ptr; // Contained pointer.
weak_count<_Lp> _M_refcount; // Reference counter.
};
~__enable_shared_from_this() { } // 2.2.4.7 weak_ptr specialized algorithms.
template<typename _Tp, _Lock_policy _Lp>
void
swap(__weak_ptr<_Tp, _Lp>& __a, __weak_ptr<_Tp, _Lp>& __b)
{ __a.swap(__b); }
public:
__shared_ptr<_Tp, _Lp>
shared_from_this()
{
__shared_ptr<_Tp, _Lp> __p(this->_M_weak_this);
return __p;
}
__shared_ptr<const _Tp, _Lp> template<typename _Tp, _Lock_policy _Lp = __default_lock_policy>
shared_from_this() const class __enable_shared_from_this
{ {
__shared_ptr<const _Tp, _Lp> __p(this->_M_weak_this); protected:
return __p; __enable_shared_from_this() { }
}
__enable_shared_from_this(const __enable_shared_from_this&) { }
__enable_shared_from_this&
operator=(const __enable_shared_from_this&)
{ return *this; }
private: ~__enable_shared_from_this() { }
template<typename _Tp1>
void public:
_M_weak_assign(_Tp1* __p, const shared_count<_Lp>& __n) const __shared_ptr<_Tp, _Lp>
{ _M_weak_this._M_assign(__p, __n); } shared_from_this()
template<typename _Tp1>
friend void
__enable_shared_from_this_helper(const shared_count<_Lp>& __pn,
const __enable_shared_from_this* __pe,
const _Tp1* __px)
{ {
if (__pe != 0) __shared_ptr<_Tp, _Lp> __p(this->_M_weak_this);
__pe->_M_weak_assign(const_cast<_Tp1*>(__px), __pn); return __p;
} }
__shared_ptr<const _Tp, _Lp>
shared_from_this() const
{
__shared_ptr<const _Tp, _Lp> __p(this->_M_weak_this);
return __p;
}
private:
template<typename _Tp1>
void
_M_weak_assign(_Tp1* __p, const shared_count<_Lp>& __n) const
{ _M_weak_this._M_assign(__p, __n); }
template<typename _Tp1>
friend void
__enable_shared_from_this_helper(const shared_count<_Lp>& __pn,
const __enable_shared_from_this* __pe,
const _Tp1* __px)
{
if (__pe != 0)
__pe->_M_weak_assign(const_cast<_Tp1*>(__px), __pn);
}
mutable __weak_ptr<_Tp, _Lp> _M_weak_this;
};
mutable __weak_ptr<_Tp, _Lp> _M_weak_this; template<typename _Tp>
}; class shared_ptr;
template<typename _Tp>
class shared_ptr;
// The actual TR1 weak_ptr, with forwarding constructors and // The actual TR1 weak_ptr, with forwarding constructors and
// assignment operators. // assignment operators.
template<typename _Tp> template<typename _Tp>
class weak_ptr : public __weak_ptr<_Tp> class weak_ptr : public __weak_ptr<_Tp>
{ {
public: public:
weak_ptr() : __weak_ptr<_Tp>() { } weak_ptr() : __weak_ptr<_Tp>() { }
template<typename _Tp1> template<typename _Tp1>
weak_ptr(const __weak_ptr<_Tp1>& r) : __weak_ptr<_Tp>(r) { } weak_ptr(const __weak_ptr<_Tp1>& r) : __weak_ptr<_Tp>(r) { }
template<typename _Tp1> template<typename _Tp1>
weak_ptr(const __shared_ptr<_Tp1>& r) : __weak_ptr<_Tp>(r) { } weak_ptr(const __shared_ptr<_Tp1>& r) : __weak_ptr<_Tp>(r) { }
template<typename _Tp1> template<typename _Tp1>
weak_ptr& weak_ptr&
operator=(const weak_ptr<_Tp1>& r) // never throws operator=(const weak_ptr<_Tp1>& r) // never throws
{ {
this->__weak_ptr<_Tp>::operator=(r); this->__weak_ptr<_Tp>::operator=(r);
return *this; return *this;
} }
template<typename _Tp1> template<typename _Tp1>
weak_ptr& weak_ptr&
operator=(const shared_ptr<_Tp1>& r) // never throws operator=(const shared_ptr<_Tp1>& r) // never throws
{ {
this->__weak_ptr<_Tp>::operator=(r); this->__weak_ptr<_Tp>::operator=(r);
return *this; return *this;
} }
}; };
// The actual TR1 shared_ptr, with forwarding constructors and // The actual TR1 shared_ptr, with forwarding constructors and
// assignment operators. // assignment operators.
template<typename _Tp> template<typename _Tp>
class shared_ptr : public __shared_ptr<_Tp> class shared_ptr : public __shared_ptr<_Tp>
{ {
public: public:
shared_ptr() : __shared_ptr<_Tp>() { } shared_ptr() : __shared_ptr<_Tp>() { }
template<typename _Tp1> template<typename _Tp1>
explicit shared_ptr(_Tp1* __p) explicit
: __shared_ptr<_Tp>(__p) { } shared_ptr(_Tp1* __p)
: __shared_ptr<_Tp>(__p) { }
template<typename _Tp1, typename _Deleter> template<typename _Tp1, typename _Deleter>
shared_ptr(_Tp1* __p, _Deleter __d) shared_ptr(_Tp1* __p, _Deleter __d)
: __shared_ptr<_Tp>(__p, __d) { } : __shared_ptr<_Tp>(__p, __d) { }
template<typename _Tp1> template<typename _Tp1>
shared_ptr(const __shared_ptr<_Tp1>& __r) shared_ptr(const __shared_ptr<_Tp1>& __r)
: __shared_ptr<_Tp>(__r) { } : __shared_ptr<_Tp>(__r) { }
template<typename _Tp1> template<typename _Tp1>
explicit shared_ptr(const __weak_ptr<_Tp1>& __r) explicit
: __shared_ptr<_Tp>(__r) { } shared_ptr(const __weak_ptr<_Tp1>& __r)
: __shared_ptr<_Tp>(__r) { }
template<typename _Tp1> template<typename _Tp1>
explicit shared_ptr(std::auto_ptr<_Tp1>& __r) explicit
: __shared_ptr<_Tp>(__r) { } shared_ptr(std::auto_ptr<_Tp1>& __r)
: __shared_ptr<_Tp>(__r) { }
template<typename _Tp1>
shared_ptr(const __shared_ptr<_Tp1>& __r, __static_cast_tag) template<typename _Tp1>
: __shared_ptr<_Tp>(__r, __static_cast_tag()) { } shared_ptr(const __shared_ptr<_Tp1>& __r, __static_cast_tag)
: __shared_ptr<_Tp>(__r, __static_cast_tag()) { }
template<typename _Tp1>
shared_ptr(const __shared_ptr<_Tp1>& __r, __const_cast_tag) template<typename _Tp1>
: __shared_ptr<_Tp>(__r, __const_cast_tag()) { } shared_ptr(const __shared_ptr<_Tp1>& __r, __const_cast_tag)
: __shared_ptr<_Tp>(__r, __const_cast_tag()) { }
template<typename _Tp1> template<typename _Tp1>
shared_ptr(const __shared_ptr<_Tp1>& __r, __dynamic_cast_tag) shared_ptr(const __shared_ptr<_Tp1>& __r, __dynamic_cast_tag)
: __shared_ptr<_Tp>(__r, __dynamic_cast_tag()) { } : __shared_ptr<_Tp>(__r, __dynamic_cast_tag()) { }
// Additional non-base assignment operators to avoid excessive errors. // Additional non-base assignment operators to avoid excessive errors.
template<typename _Tp1> template<typename _Tp1>
shared_ptr& shared_ptr&
operator=(std::auto_ptr<_Tp1>& __r) operator=(std::auto_ptr<_Tp1>& __r)
{ {
this->__shared_ptr<_Tp>::operator=(__r); this->__shared_ptr<_Tp>::operator=(__r);
return *this; return *this;
} }
template<typename _Tp1>
shared_ptr&
operator=(const shared_ptr<_Tp1>& __r) // never throws
{
this->__shared_ptr<_Tp>::operator=(__r);
return *this;
}
};
template<typename _Tp> template<typename _Tp1>
class enable_shared_from_this : public __enable_shared_from_this<_Tp> shared_ptr&
{ operator=(const shared_ptr<_Tp1>& __r) // never throws
protected: {
enable_shared_from_this() this->__shared_ptr<_Tp>::operator=(__r);
: __enable_shared_from_this<_Tp>() { } return *this;
}
enable_shared_from_this(const enable_shared_from_this&) };
: __enable_shared_from_this<_Tp>(enable_shared_from_this<_Tp>()) { }
};
template<typename _Tp>
class enable_shared_from_this : public __enable_shared_from_this<_Tp>
{
protected:
enable_shared_from_this()
: __enable_shared_from_this<_Tp>() { }
enable_shared_from_this(const enable_shared_from_this&)
: __enable_shared_from_this<_Tp>(enable_shared_from_this<_Tp>()) { }
};
_GLIBCXX_END_NAMESPACE _GLIBCXX_END_NAMESPACE
} // namespace std } // namespace std
......
Markdown is supported
0% or
You are about to add 0 people to the discussion. Proceed with caution.
Finish editing this message first!
Please register or to comment