{
_GLIBCXX_BEGIN_NAMESPACE(tr1)
-class bad_weak_ptr : public std::exception
-{
-public:
- virtual char const*
- what() const throw() { return "tr1::bad_weak_ptr"; }
-};
+ class bad_weak_ptr : public std::exception
+ {
+ public:
+ virtual char const*
+ what() const throw()
+ { return "tr1::bad_weak_ptr"; }
+ };
// Substitute for bad_weak_ptr object in the case of -fno-exceptions.
-inline void
-__throw_bad_weak_ptr()
-{
+ inline void
+ __throw_bad_weak_ptr()
+ {
#if __EXCEPTIONS
- throw bad_weak_ptr();
+ throw bad_weak_ptr();
#else
- std::abort();
+ std::abort();
#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>
- struct _Sp_deleter
- {
- typedef void result_type;
- typedef _Tp* argument_type;
+ 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;
- void
- operator()(_Tp* p) const
- { delete p; }
- };
+ template<typename _Tp>
+ struct _Sp_deleter
+ {
+ typedef void result_type;
+ typedef _Tp* argument_type;
-// Empty helper class except when the template argument is _S_mutex.
-template<_Lock_policy _Lp>
- class _Mutex_base
- { };
+ void
+ operator()(_Tp* p) const
+ { delete p; }
+ };
-template<>
- class _Mutex_base<_S_mutex> : public __gnu_cxx::__mutex
- { };
+ // Empty helper class except when the template argument is _S_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>
- 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
+ template<_Lock_policy _Lp = __default_lock_policy>
+ class _Sp_counted_base : public _Mutex_base<_Lp>
{
- if (__gnu_cxx::__exchange_and_add(&_M_use_count, -1) == 1)
- {
- dispose();
- #ifdef __GTHREADS
- _GLIBCXX_READ_MEM_BARRIER;
- _GLIBCXX_WRITE_MEM_BARRIER;
- #endif
- if (__gnu_cxx::__exchange_and_add(&_M_weak_count, -1) == 1)
- destroy();
- }
- }
+ public:
+ _Sp_counted_base() : _M_use_count(1), _M_weak_count(1) { }
+
+ virtual
+ ~_Sp_counted_base() // nothrow
+ { }
- void
- weak_add_ref() // nothrow
- { __gnu_cxx::__atomic_add(&_M_weak_count, 1); }
+ // 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
- weak_release() // nothrow
- {
- if (__gnu_cxx::__exchange_and_add(&_M_weak_count, -1) == 1)
- {
-#ifdef __GTHREADS
- _GLIBCXX_READ_MEM_BARRIER;
- _GLIBCXX_WRITE_MEM_BARRIER;
+ void
+ add_ref_lock();
+
+ void
+ release() // nothrow
+ {
+ if (__gnu_cxx::__exchange_and_add(&_M_use_count, -1) == 1)
+ {
+ dispose();
+#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?
+ if (__gnu_cxx::__exchange_and_add(&_M_weak_count, -1) == 1)
+ destroy();
+ }
+ }
- private:
- _Sp_counted_base(_Sp_counted_base const&);
- _Sp_counted_base& operator=(_Sp_counted_base const&);
+ void
+ weak_add_ref() // nothrow
+ { __gnu_cxx::__atomic_add(&_M_weak_count, 1); }
- _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)
+ void
+ weak_release() // nothrow
{
- _M_use_count = 0;
- __throw_bad_weak_ptr();
+ if (__gnu_cxx::__exchange_and_add(&_M_weak_count, -1) == 1)
+ {
+#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
-template<>
- inline void
- _Sp_counted_base<_S_mutex>::add_ref_lock()
- {
- __gnu_cxx::__scoped_lock sentry(*this);
- if (__gnu_cxx::__exchange_and_add(&_M_use_count, 1) == 0)
- {
- _M_use_count = 0;
- __throw_bad_weak_ptr();
- }
- }
+ template<>
+ inline void
+ _Sp_counted_base<_S_mutex>::add_ref_lock()
+ {
+ __gnu_cxx::__scoped_lock sentry(*this);
+ if (__gnu_cxx::__exchange_and_add(&_M_use_count, 1) == 0)
+ {
+ _M_use_count = 0;
+ __throw_bad_weak_ptr();
+ }
+ }
#endif
-template<>
- inline void
- _Sp_counted_base<_S_atomic>::add_ref_lock()
- {
- // Perform lock-free add-if-not-zero operation.
- _Atomic_word __count;
- do
+ template<>
+ inline void
+ _Sp_counted_base<_S_atomic>::add_ref_lock()
{
- __count = _M_use_count;
- 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.
+ // Perform lock-free add-if-not-zero operation.
+ _Atomic_word __count;
+ do
+ {
+ __count = _M_use_count;
+ 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>
- class _Sp_counted_base_impl : public _Sp_counted_base<_Lp>
- {
- public:
- /**
- * @brief
- * @pre d(p) must not throw.
- */
- _Sp_counted_base_impl(_Ptr __p, _Deleter __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&);
+ template<typename _Ptr, typename _Deleter, _Lock_policy _Lp>
+ class _Sp_counted_base_impl : public _Sp_counted_base<_Lp>
+ {
+ public:
+ /**
+ * @brief
+ * @pre d(p) must not throw.
+ */
+ _Sp_counted_base_impl(_Ptr __p, _Deleter __d)
+ : _M_ptr(__p), _M_del(__d) { }
- _Ptr _M_ptr; // copy constructor must not throw
- _Deleter _M_del; // copy constructor must not throw
- };
+ 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
+ _Deleter _M_del; // copy constructor must not throw
+ };
-template<_Lock_policy _Lp = __default_lock_policy>
- class weak_count;
+ template<_Lock_policy _Lp = __default_lock_policy>
+ class weak_count;
-template<_Lock_policy _Lp = __default_lock_policy>
- 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
+ template<_Lock_policy _Lp = __default_lock_policy>
+ class shared_count
{
- _Sp_counted_base<_Lp>* __tmp = __r._M_pi;
- if (__tmp != _M_pi)
- {
- if (__tmp != 0)
- __tmp->add_ref_copy();
- if (_M_pi != 0)
- _M_pi->release();
- _M_pi = __tmp;
- }
- return *this;
- }
+ private:
+ _Sp_counted_base<_Lp>* _M_pi;
- void swap(shared_count& __r) // nothrow
- {
- _Sp_counted_base<_Lp>* __tmp = __r._M_pi;
- __r._M_pi = _M_pi;
- _M_pi = __tmp;
- }
+ friend class weak_count<_Lp>;
- long
- use_count() const // nothrow
- { return _M_pi != 0 ? _M_pi->use_count() : 0; }
+ public:
+ shared_count() : _M_pi(0) // nothrow
+ { }
- bool
- unique() const // nothrow
- { return this->use_count() == 1; }
+ 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(); }
- friend inline bool
- operator==(const shared_count& __a, const shared_count& __b)
- { return __a._M_pi == __b._M_pi; }
+ // Throw bad_weak_ptr when __r.use_count() == 0.
+ explicit shared_count(const weak_count<_Lp>& __r);
- friend inline bool
- operator<(const shared_count& __a, const shared_count& __b)
- { return std::less<_Sp_counted_base<_Lp>*>()(__a._M_pi, __b._M_pi); }
+ ~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();
+ }
- void*
- get_deleter(const std::type_info& __ti) const
- { return _M_pi ? _M_pi->get_deleter(__ti) : 0; }
- };
-
-template<_Lock_policy _Lp>
- class weak_count
- {
- private:
- _Sp_counted_base<_Lp>* _M_pi;
+ shared_count&
+ operator=(const shared_count& __r) // nothrow
+ {
+ _Sp_counted_base<_Lp>* __tmp = __r._M_pi;
+ if (__tmp != _M_pi)
+ {
+ if (__tmp != 0)
+ __tmp->add_ref_copy();
+ if (_M_pi != 0)
+ _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:
- weak_count()
- : _M_pi(0) // nothrow
- { }
+ long
+ use_count() const // 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)
- : _M_pi(__r._M_pi) // nothrow
- {
- if (_M_pi != 0)
- _M_pi->weak_add_ref();
- }
+ friend inline bool
+ operator<(const shared_count& __a, const shared_count& __b)
+ { return std::less<_Sp_counted_base<_Lp>*>()(__a._M_pi, __b._M_pi); }
- weak_count(const weak_count<_Lp>& __r)
- : _M_pi(__r._M_pi) // nothrow
+ void*
+ 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)
- _M_pi->weak_add_ref();
- }
+ private:
+ _Sp_counted_base<_Lp>* _M_pi;
+
+ friend class shared_count<_Lp>;
+
+ public:
+ weak_count()
+ : _M_pi(0) // nothrow
+ { }
- ~weak_count() // nothrow
- {
- if (_M_pi != 0)
- _M_pi->weak_release();
- }
+ weak_count(const shared_count<_Lp>& __r)
+ : _M_pi(__r._M_pi) // nothrow
+ {
+ 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>&
- 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;
- }
+ void
+ swap(weak_count<_Lp>& __r) // nothrow
+ {
+ _Sp_counted_base<_Lp> * __tmp = __r._M_pi;
+ __r._M_pi = _M_pi;
+ _M_pi = __tmp;
+ }
- weak_count<_Lp>&
- operator=(const weak_count<_Lp>& __r) // nothrow
+ long
+ 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)
- _M_pi->weak_release();
- _M_pi = __tmp;
- return *this;
- }
-
- void
- swap(weak_count<_Lp>& __r) // nothrow
- {
- _Sp_counted_base<_Lp> * __tmp = __r._M_pi;
- __r._M_pi = _M_pi;
- _M_pi = __tmp;
+ _M_pi->add_ref_lock();
+ else
+ __throw_bad_weak_ptr();
}
- long
- 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; }
+
+ // Forward decls.
+ 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 std::less<_Sp_counted_base<_Lp>*>()(__a._M_pi, __b._M_pi); }
- };
+ template<typename _Tp, _Lock_policy _Lp = __default_lock_policy>
+ class __weak_ptr;
-template<_Lock_policy _Lp>
- inline
- 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();
- }
+ template<typename _Tp, _Lock_policy _Lp>
+ class __enable_shared_from_this;
+ struct __static_cast_tag { };
+ struct __const_cast_tag { };
+ struct __dynamic_cast_tag { };
+ struct __polymorphic_cast_tag { };
-// Forward decls.
-template<typename _Tp, _Lock_policy _Lp = __default_lock_policy>
- class __shared_ptr;
+ template<class _Tp>
+ struct __shared_ptr_reference
+ { typedef _Tp& __type; };
-template<typename _Tp, _Lock_policy _Lp = __default_lock_policy>
- class __weak_ptr;
+ template<>
+ struct __shared_ptr_reference<void>
+ { typedef void __type; };
-template<typename _Tp, _Lock_policy _Lp>
- class __enable_shared_from_this;
+ template<>
+ struct __shared_ptr_reference<void const>
+ { typedef void __type; };
-struct __static_cast_tag { };
-struct __const_cast_tag { };
-struct __dynamic_cast_tag { };
-struct __polymorphic_cast_tag { };
+ template<>
+ struct __shared_ptr_reference<void volatile>
+ { typedef void __type; };
-template<class _Tp>
- struct shared_ptr_traits
- { typedef _Tp& reference; };
+ template<>
+ struct __shared_ptr_reference<void const volatile>
+ { typedef void __type; };
-template<>
- struct shared_ptr_traits<void>
- { typedef void reference; };
-template<>
- struct shared_ptr_traits<void const>
- { typedef void reference; };
+ // Support for enable_shared_from_this.
-template<>
- struct shared_ptr_traits<void volatile>
- { typedef void reference; };
+ // Friend of __enable_shared_from_this.
+ template<_Lock_policy _Lp, typename _Tp1, typename _Tp2>
+ void
+ __enable_shared_from_this_helper(const shared_count<_Lp>&,
+ const __enable_shared_from_this<_Tp1,
+ _Lp>*, const _Tp2*);
-template<>
- struct shared_ptr_traits<void const volatile>
- { typedef void reference; };
+ template<_Lock_policy _Lp>
+ inline void
+ __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.
-template<_Lock_policy _Lp, typename _Tp1, typename _Tp2>
- void
- __enable_shared_from_this_helper(const shared_count<_Lp>&,
- const __enable_shared_from_this<_Tp1, _Lp>*,
- const _Tp2*);
+ public:
+ typedef _Tp element_type;
+
+ /** @brief Construct an empty %__shared_ptr.
+ * @post use_count()==0 && get()==0
+ */
+ __shared_ptr()
+ : _M_ptr(0), _M_refcount() // never throws
+ { }
-template<_Lock_policy _Lp>
- inline void
- __enable_shared_from_this_helper(const shared_count<_Lp>&, ...)
- { }
+ /** @brief Construct a %__shared_ptr that owns the pointer @a p.
+ * @param p A pointer that is convertible to element_type*.
+ * @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>
- *
- * 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_traits<_Tp>::reference _Reference;
+ /**
+ * @post use_count() == 1 and r.get() == 0
+ */
+ 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,
+ // delete r.release() well-formed
+ _Tp1 * __tmp = __r.get();
+ _M_refcount = shared_count<_Lp>(__r);
+ __enable_shared_from_this_helper( _M_refcount, __tmp, __tmp );
+ }
- public:
- typedef _Tp element_type;
+ template<typename _Tp1>
+ __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.
- * @post use_count()==0 && get()==0
- */
- __shared_ptr()
- : _M_ptr(0), _M_refcount() // never throws
- { }
+ template<typename _Tp1>
+ __shared_ptr&
+ operator=(std::auto_ptr<_Tp1>& __r)
+ {
+ __shared_ptr(__r).swap(*this);
+ return *this;
+ }
- /** @brief Construct a %__shared_ptr that owns the pointer @a p.
- * @param p A pointer that is convertible to element_type*.
- * @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 );
- }
+ void
+ reset() // never throws
+ { __shared_ptr().swap(*this); }
- //
- // 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 );
- }
+ template<typename _Tp1>
+ void
+ reset(_Tp1* __p) // _Tp1 must be complete.
+ {
+ // Catch self-reset errors.
+ _GLIBCXX_DEBUG_ASSERT(__p == 0 || __p != _M_ptr);
+ __shared_ptr(__p).swap(*this);
+ }
- // 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;
- }
+ template<typename _Tp1, typename _Deleter>
+ void
+ reset(_Tp1 * __p, _Deleter __d)
+ { __shared_ptr(__p, __d).swap(*this); }
- /**
- * @post use_count() == 1 and r.get() == 0
- */
- template<typename _Tp1>
- explicit __shared_ptr(std::auto_ptr<_Tp1>& __r)
- : _M_ptr(__r.get()), _M_refcount()
+ // Error to instantiate if _Tp is [cv-qual] void.
+ _Reference
+ operator*() const // never throws
{
- // TODO requires r.release() convertible to _Tp*, Tp1 is complete,
- // delete r.release() well-formed
- _Tp1 * __tmp = __r.get();
- _M_refcount = shared_count<_Lp>(__r);
- __enable_shared_from_this_helper( _M_refcount, __tmp, __tmp );
+ _GLIBCXX_DEBUG_ASSERT(_M_ptr != 0);
+ return *_M_ptr;
}
- template<typename _Tp1>
- __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)
+ _Tp*
+ operator->() const // never throws
{
- if (_M_ptr == 0) // need to allocate new counter -- the cast failed
- _M_refcount = shared_count<_Lp>();
+ _GLIBCXX_DEBUG_ASSERT(_M_ptr != 0);
+ return _M_ptr;
}
+
+ _Tp*
+ get() const // never throws
+ { return _M_ptr; }
- 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;
- }
+ // Implicit conversion to "bool"
+ private:
+ typedef _Tp* __shared_ptr::*__unspecified_bool_type;
- template<typename _Tp1>
- __shared_ptr&
- operator=(std::auto_ptr<_Tp1>& __r)
- {
- __shared_ptr(__r).swap(*this);
- return *this;
- }
+ public:
+ operator __unspecified_bool_type() const // never throws
+ { return _M_ptr == 0 ? 0 : &__shared_ptr::_M_ptr; }
- void
- reset() // never throws
- { __shared_ptr().swap(*this); }
+ bool
+ unique() const // never throws
+ { return _M_refcount.unique(); }
+
+ long
+ use_count() const // never throws
+ { return _M_refcount.use_count(); }
- template<typename _Tp1>
void
- reset(_Tp1* __p) // _Tp1 must be complete.
+ swap(__shared_ptr<_Tp, _Lp>& __other) // never throws
{
- // Catch self-reset errors.
- _GLIBCXX_DEBUG_ASSERT(__p == 0 || __p != _M_ptr);
- __shared_ptr(__p).swap(*this);
+ std::swap(_M_ptr, __other._M_ptr);
+ _M_refcount.swap(__other._M_refcount);
}
- template<typename _Tp1, typename _Deleter>
- void
- reset(_Tp1 * __p, _Deleter __d)
- { __shared_ptr(__p, __d).swap(*this); }
-
- // Error to instantiate if _Tp is [cv-qual] void.
- _Reference
- operator*() const // never throws
- {
- _GLIBCXX_DEBUG_ASSERT(_M_ptr != 0);
- return *_M_ptr;
- }
-
- _Tp*
- operator->() const // 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)
{
- _GLIBCXX_DEBUG_ASSERT(_M_ptr != 0);
- return _M_ptr;
+ __os << __p.get();
+ 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
- unique() const // never throws
- { return _M_refcount.unique(); }
+ // 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))); }
- long
- use_count() const // never throws
- { return _M_refcount.use_count(); }
- void
- swap(__shared_ptr<_Tp, _Lp>& __other) // never throws
+ template<typename _Tp, _Lock_policy _Lp>
+ class __weak_ptr
{
- std::swap(_M_ptr, __other._M_ptr);
- _M_refcount.swap(__other._M_refcount);
- }
-
- 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
- { }
+ public:
+ typedef _Tp element_type;
+
+ __weak_ptr() : _M_ptr(0), _M_refcount() // never throws
+ { }
- // Generated copy constructor, assignment, destructor are fine.
-
- // The "obvious" converting constructor implementation:
- //
- // template<class Y>
- // __weak_ptr(__weak_ptr<Y> const & r)
- // : _M_ptr(r._M_ptr), _M_refcount(r._M_refcount) // never throws
- // { }
- //
- // has a serious problem.
- //
- // r._M_ptr may already have been invalidated. The _M_ptr(r._M_ptr)
- // conversion may require access to *r._M_ptr (virtual inheritance).
- //
- // It is not possible to avoid spurious access violations since
- // in multithreaded programs r._M_ptr may be invalidated at any point.
- template<typename _Tp1>
- __weak_ptr(const __weak_ptr<_Tp1, _Lp>& r)
- : _M_refcount(r._M_refcount) // never throws
- {
- __glibcxx_function_requires(_ConvertibleConcept<_Tp1*, _Tp*>)
- _M_ptr = r.lock().get();
- }
+ // Generated copy constructor, assignment, destructor are fine.
+
+ // The "obvious" converting constructor implementation:
+ //
+ // template<class Y>
+ // __weak_ptr(__weak_ptr<Y> const & r)
+ // : _M_ptr(r._M_ptr), _M_refcount(r._M_refcount) // never throws
+ // { }
+ //
+ // has a serious problem.
+ //
+ // r._M_ptr may already have been invalidated. The _M_ptr(r._M_ptr)
+ // conversion may require access to *r._M_ptr (virtual inheritance).
+ //
+ // It is not possible to avoid spurious access violations since
+ // in multithreaded programs r._M_ptr may be invalidated at any point.
+ template<typename _Tp1>
+ __weak_ptr(const __weak_ptr<_Tp1, _Lp>& r)
+ : _M_refcount(r._M_refcount) // never throws
+ {
+ __glibcxx_function_requires(_ConvertibleConcept<_Tp1*, _Tp*>)
+ _M_ptr = r.lock().get();
+ }
- template<typename _Tp1>
- __weak_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*>) }
+ template<typename _Tp1>
+ __weak_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*>) }
- template<typename _Tp1>
- __weak_ptr&
- operator=(const __weak_ptr<_Tp1, _Lp>& r) // never throws
- {
- _M_ptr = r.lock().get();
- _M_refcount = r._M_refcount;
- return *this;
- }
+ template<typename _Tp1>
+ __weak_ptr&
+ operator=(const __weak_ptr<_Tp1, _Lp>& r) // never throws
+ {
+ _M_ptr = r.lock().get();
+ _M_refcount = r._M_refcount;
+ 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>
- __weak_ptr&
- operator=(const __shared_ptr<_Tp1, _Lp>& r) // never throws
+ __shared_ptr<_Tp, _Lp>
+ lock() const // never throws
{
- _M_ptr = r._M_ptr;
- _M_refcount = r._M_refcount;
- return *this;
- }
-
- __shared_ptr<_Tp, _Lp>
- lock() const // never throws
- {
#ifdef __GTHREADS
- // Optimization: avoid throw overhead.
- if (expired())
- return __shared_ptr<element_type, _Lp>();
+ // Optimization: avoid throw overhead.
+ if (expired())
+ return __shared_ptr<element_type, _Lp>();
- try
- {
- return __shared_ptr<element_type, _Lp>(*this);
- }
- catch (const bad_weak_ptr&)
- {
- // Q: How can we get here?
- // A: Another thread may have invalidated r after the
- // use_count test above.
- return __shared_ptr<element_type>();
- }
-
+ try
+ {
+ return __shared_ptr<element_type, _Lp>(*this);
+ }
+ catch (const bad_weak_ptr&)
+ {
+ // Q: How can we get here?
+ // A: Another thread may have invalidated r after the
+ // use_count test above.
+ return __shared_ptr<element_type>();
+ }
+
#else
- // Optimization: avoid try/catch overhead when single threaded.
- return expired() ? __shared_ptr<element_type, _Lp>()
- : __shared_ptr<element_type, _Lp>(*this);
+ // Optimization: avoid try/catch overhead when single threaded.
+ return expired() ? __shared_ptr<element_type, _Lp>()
+ : __shared_ptr<element_type, _Lp>(*this);
#endif
- } // XXX MT
-
- long
- use_count() const // never throws
- { return _M_refcount.use_count(); }
-
- bool
- expired() const // never throws
- { return _M_refcount.use_count() == 0; }
+ } // XXX MT
- void
- reset() // never throws
- { __weak_ptr().swap(*this); }
-
- void
- swap(__weak_ptr& __s) // never throws
- {
- std::swap(_M_ptr, __s._M_ptr);
- _M_refcount.swap(__s._M_refcount);
- }
+ long
+ use_count() const // never throws
+ { return _M_refcount.use_count(); }
- private:
- template<typename _Tp1>
bool
- _M_less(const __weak_ptr<_Tp1, _Lp>& __rhs) const
- { return _M_refcount < __rhs._M_refcount; }
-
- // Used by __enable_shared_from_this.
- void
- _M_assign(_Tp* __ptr, const shared_count<_Lp>& __refcount)
- {
- _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); }
+ expired() const // never throws
+ { return _M_refcount.use_count() == 0; }
+
+ void
+ reset() // never throws
+ { __weak_ptr().swap(*this); }
+ 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>
- class __enable_shared_from_this
- {
- protected:
- __enable_shared_from_this() { }
+ private:
+ template<typename _Tp1>
+ bool
+ _M_less(const __weak_ptr<_Tp1, _Lp>& __rhs) const
+ { 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&
- operator=(const __enable_shared_from_this&)
- { return *this; }
+ // 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.
+ };
- ~__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>
- shared_from_this() const
+ template<typename _Tp, _Lock_policy _Lp = __default_lock_policy>
+ class __enable_shared_from_this
{
- __shared_ptr<const _Tp, _Lp> __p(this->_M_weak_this);
- return __p;
- }
+ protected:
+ __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:
- 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)
+ ~__enable_shared_from_this() { }
+
+ public:
+ __shared_ptr<_Tp, _Lp>
+ shared_from_this()
{
- if (__pe != 0)
- __pe->_M_weak_assign(const_cast<_Tp1*>(__px), __pn);
+ __shared_ptr<_Tp, _Lp> __p(this->_M_weak_this);
+ 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
-// assignment operators.
-template<typename _Tp>
- class weak_ptr : public __weak_ptr<_Tp>
- {
- public:
- weak_ptr() : __weak_ptr<_Tp>() { }
-
- template<typename _Tp1>
- weak_ptr(const __weak_ptr<_Tp1>& r) : __weak_ptr<_Tp>(r) { }
+ // The actual TR1 weak_ptr, with forwarding constructors and
+ // assignment operators.
+ template<typename _Tp>
+ class weak_ptr : public __weak_ptr<_Tp>
+ {
+ public:
+ weak_ptr() : __weak_ptr<_Tp>() { }
+
+ template<typename _Tp1>
+ weak_ptr(const __weak_ptr<_Tp1>& r) : __weak_ptr<_Tp>(r) { }
- template<typename _Tp1>
- weak_ptr(const __shared_ptr<_Tp1>& r) : __weak_ptr<_Tp>(r) { }
+ template<typename _Tp1>
+ weak_ptr(const __shared_ptr<_Tp1>& r) : __weak_ptr<_Tp>(r) { }
- template<typename _Tp1>
- weak_ptr&
- operator=(const weak_ptr<_Tp1>& r) // never throws
- {
- this->__weak_ptr<_Tp>::operator=(r);
- return *this;
- }
+ template<typename _Tp1>
+ weak_ptr&
+ operator=(const weak_ptr<_Tp1>& r) // never throws
+ {
+ this->__weak_ptr<_Tp>::operator=(r);
+ return *this;
+ }
- template<typename _Tp1>
- weak_ptr&
- operator=(const shared_ptr<_Tp1>& r) // never throws
- {
- this->__weak_ptr<_Tp>::operator=(r);
- return *this;
- }
- };
+ template<typename _Tp1>
+ weak_ptr&
+ operator=(const shared_ptr<_Tp1>& r) // never throws
+ {
+ this->__weak_ptr<_Tp>::operator=(r);
+ return *this;
+ }
+ };
-// The actual TR1 shared_ptr, with forwarding constructors and
-// assignment operators.
-template<typename _Tp>
- class shared_ptr : public __shared_ptr<_Tp>
- {
- public:
- shared_ptr() : __shared_ptr<_Tp>() { }
-
- template<typename _Tp1>
- explicit shared_ptr(_Tp1* __p)
- : __shared_ptr<_Tp>(__p) { }
+ // The actual TR1 shared_ptr, with forwarding constructors and
+ // assignment operators.
+ template<typename _Tp>
+ class shared_ptr : public __shared_ptr<_Tp>
+ {
+ public:
+ shared_ptr() : __shared_ptr<_Tp>() { }
+
+ template<typename _Tp1>
+ explicit
+ shared_ptr(_Tp1* __p)
+ : __shared_ptr<_Tp>(__p) { }
- template<typename _Tp1, typename _Deleter>
- shared_ptr(_Tp1* __p, _Deleter __d)
- : __shared_ptr<_Tp>(__p, __d) { }
+ template<typename _Tp1, typename _Deleter>
+ shared_ptr(_Tp1* __p, _Deleter __d)
+ : __shared_ptr<_Tp>(__p, __d) { }
- template<typename _Tp1>
- shared_ptr(const __shared_ptr<_Tp1>& __r)
- : __shared_ptr<_Tp>(__r) { }
+ template<typename _Tp1>
+ shared_ptr(const __shared_ptr<_Tp1>& __r)
+ : __shared_ptr<_Tp>(__r) { }
- template<typename _Tp1>
- explicit shared_ptr(const __weak_ptr<_Tp1>& __r)
- : __shared_ptr<_Tp>(__r) { }
+ template<typename _Tp1>
+ explicit
+ shared_ptr(const __weak_ptr<_Tp1>& __r)
+ : __shared_ptr<_Tp>(__r) { }
- template<typename _Tp1>
- explicit shared_ptr(std::auto_ptr<_Tp1>& __r)
- : __shared_ptr<_Tp>(__r) { }
-
- template<typename _Tp1>
- 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)
- : __shared_ptr<_Tp>(__r, __const_cast_tag()) { }
+ template<typename _Tp1>
+ explicit
+ shared_ptr(std::auto_ptr<_Tp1>& __r)
+ : __shared_ptr<_Tp>(__r) { }
+
+ template<typename _Tp1>
+ 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)
+ : __shared_ptr<_Tp>(__r, __const_cast_tag()) { }
- template<typename _Tp1>
- shared_ptr(const __shared_ptr<_Tp1>& __r, __dynamic_cast_tag)
- : __shared_ptr<_Tp>(__r, __dynamic_cast_tag()) { }
-
- // Additional non-base assignment operators to avoid excessive errors.
- template<typename _Tp1>
- shared_ptr&
- operator=(std::auto_ptr<_Tp1>& __r)
- {
- this->__shared_ptr<_Tp>::operator=(__r);
- 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 _Tp1>
+ shared_ptr(const __shared_ptr<_Tp1>& __r, __dynamic_cast_tag)
+ : __shared_ptr<_Tp>(__r, __dynamic_cast_tag()) { }
+
+ // Additional non-base assignment operators to avoid excessive errors.
+ template<typename _Tp1>
+ shared_ptr&
+ operator=(std::auto_ptr<_Tp1>& __r)
+ {
+ this->__shared_ptr<_Tp>::operator=(__r);
+ return *this;
+ }
-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>()) { }
- };
+ template<typename _Tp1>
+ shared_ptr&
+ operator=(const shared_ptr<_Tp1>& __r) // never throws
+ {
+ this->__shared_ptr<_Tp>::operator=(__r);
+ return *this;
+ }
+ };
+ 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
} // namespace std
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