1125 lines
33 KiB
C++
1125 lines
33 KiB
C++
// <tr1_impl/boost_shared_ptr.h> -*- C++ -*-
|
|
|
|
// Copyright (C) 2007 Free Software Foundation, Inc.
|
|
//
|
|
// This file is part of the GNU ISO C++ Library. This library is free
|
|
// software; you can redistribute it and/or modify it under the
|
|
// terms of the GNU General Public License as published by the
|
|
// Free Software Foundation; either version 2, or (at your option)
|
|
// any later version.
|
|
|
|
// This library is distributed in the hope that it will be useful,
|
|
// but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
|
// GNU General Public License for more details.
|
|
|
|
// You should have received a copy of the GNU General Public License along
|
|
// with this library; see the file COPYING. If not, write to the Free
|
|
// Software Foundation, 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301,
|
|
// USA.
|
|
|
|
// As a special exception, you may use this file as part of a free software
|
|
// library without restriction. Specifically, if other files instantiate
|
|
// templates or use macros or inline functions from this file, or you compile
|
|
// this file and link it with other files to produce an executable, this
|
|
// file does not by itself cause the resulting executable to be covered by
|
|
// the GNU General Public License. This exception does not however
|
|
// invalidate any other reasons why the executable file might be covered by
|
|
// the GNU General Public License.
|
|
|
|
// shared_count.hpp
|
|
// Copyright (c) 2001, 2002, 2003 Peter Dimov and Multi Media Ltd.
|
|
|
|
// shared_ptr.hpp
|
|
// Copyright (C) 1998, 1999 Greg Colvin and Beman Dawes.
|
|
// Copyright (C) 2001, 2002, 2003 Peter Dimov
|
|
|
|
// weak_ptr.hpp
|
|
// Copyright (C) 2001, 2002, 2003 Peter Dimov
|
|
|
|
// enable_shared_from_this.hpp
|
|
// Copyright (C) 2002 Peter Dimov
|
|
|
|
// Distributed under the Boost Software License, Version 1.0. (See
|
|
// accompanying file LICENSE_1_0.txt or copy at
|
|
// http://www.boost.org/LICENSE_1_0.txt)
|
|
|
|
// GCC Note: based on version 1.32.0 of the Boost library.
|
|
|
|
/** @file tr1_impl/boost_shared_ptr.h
|
|
* This is an internal header file, included by other library headers.
|
|
* You should not attempt to use it directly.
|
|
*/
|
|
|
|
|
|
namespace std
|
|
{
|
|
_GLIBCXX_BEGIN_NAMESPACE_TR1
|
|
|
|
template<_Lock_policy _Lp>
|
|
class __weak_count
|
|
{
|
|
public:
|
|
__weak_count()
|
|
: _M_pi(0) // nothrow
|
|
{ }
|
|
|
|
__weak_count(const __shared_count<_Lp>& __r)
|
|
: _M_pi(__r._M_pi) // nothrow
|
|
{
|
|
if (_M_pi != 0)
|
|
_M_pi->_M_weak_add_ref();
|
|
}
|
|
|
|
__weak_count(const __weak_count<_Lp>& __r)
|
|
: _M_pi(__r._M_pi) // nothrow
|
|
{
|
|
if (_M_pi != 0)
|
|
_M_pi->_M_weak_add_ref();
|
|
}
|
|
|
|
~__weak_count() // nothrow
|
|
{
|
|
if (_M_pi != 0)
|
|
_M_pi->_M_weak_release();
|
|
}
|
|
|
|
__weak_count<_Lp>&
|
|
operator=(const __shared_count<_Lp>& __r) // nothrow
|
|
{
|
|
_Sp_counted_base<_Lp>* __tmp = __r._M_pi;
|
|
if (__tmp != 0)
|
|
__tmp->_M_weak_add_ref();
|
|
if (_M_pi != 0)
|
|
_M_pi->_M_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->_M_weak_add_ref();
|
|
if (_M_pi != 0)
|
|
_M_pi->_M_weak_release();
|
|
_M_pi = __tmp;
|
|
return *this;
|
|
}
|
|
|
|
void
|
|
_M_swap(__weak_count<_Lp>& __r) // nothrow
|
|
{
|
|
_Sp_counted_base<_Lp>* __tmp = __r._M_pi;
|
|
__r._M_pi = _M_pi;
|
|
_M_pi = __tmp;
|
|
}
|
|
|
|
long
|
|
_M_get_use_count() const // nothrow
|
|
{ return _M_pi != 0 ? _M_pi->_M_get_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); }
|
|
|
|
private:
|
|
friend class __shared_count<_Lp>;
|
|
|
|
_Sp_counted_base<_Lp>* _M_pi;
|
|
};
|
|
|
|
// now that __weak_count is defined we can define this constructor:
|
|
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->_M_add_ref_lock();
|
|
else
|
|
__throw_bad_weak_ptr();
|
|
}
|
|
|
|
// Forward declarations.
|
|
template<typename _Tp, _Lock_policy _Lp = __default_lock_policy>
|
|
class __shared_ptr;
|
|
|
|
template<typename _Tp, _Lock_policy _Lp = __default_lock_policy>
|
|
class __weak_ptr;
|
|
|
|
template<typename _Tp, _Lock_policy _Lp = __default_lock_policy>
|
|
class __enable_shared_from_this;
|
|
|
|
template<typename _Tp>
|
|
class shared_ptr;
|
|
|
|
template<typename _Tp>
|
|
class weak_ptr;
|
|
|
|
template<typename _Tp>
|
|
class enable_shared_from_this;
|
|
|
|
// Support for enable_shared_from_this.
|
|
|
|
// 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*);
|
|
|
|
// Friend of enable_shared_from_this.
|
|
template<typename _Tp1, typename _Tp2>
|
|
void
|
|
__enable_shared_from_this_helper(const __shared_count<>&,
|
|
const enable_shared_from_this<_Tp1>*,
|
|
const _Tp2*);
|
|
|
|
template<_Lock_policy _Lp>
|
|
inline void
|
|
__enable_shared_from_this_helper(const __shared_count<_Lp>&, ...)
|
|
{ }
|
|
|
|
|
|
#ifdef _GLIBCXX_INCLUDE_AS_TR1
|
|
struct __static_cast_tag { };
|
|
struct __const_cast_tag { };
|
|
struct __dynamic_cast_tag { };
|
|
#endif
|
|
|
|
/**
|
|
* @class __shared_ptr
|
|
*
|
|
* 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
|
|
{
|
|
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
|
|
{ }
|
|
|
|
/** @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)
|
|
{
|
|
__glibcxx_function_requires(_ConvertibleConcept<_Tp1*, _Tp*>)
|
|
// __glibcxx_function_requires(_CompleteConcept<_Tp1*>)
|
|
__enable_shared_from_this_helper(_M_refcount, __p, __p);
|
|
}
|
|
|
|
//
|
|
// Requirements: _Deleter'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 _Deleter CopyConstructible and __d(__p) well-formed
|
|
__enable_shared_from_this_helper(_M_refcount, __p, __p);
|
|
}
|
|
|
|
#ifdef _GLIBCXX_INCLUDE_AS_CXX0X
|
|
//
|
|
// Requirements: _Deleter's copy constructor and destructor must
|
|
// not throw _Alloc'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.
|
|
* @param __a An allocator.
|
|
* @post use_count() == 1 && get() == __p
|
|
* @throw std::bad_alloc, in which case @a __d(__p) is called.
|
|
*/
|
|
template<typename _Tp1, typename _Deleter, typename _Alloc>
|
|
__shared_ptr(_Tp1* __p, _Deleter __d, const _Alloc& __a)
|
|
: _M_ptr(__p), _M_refcount(__p, __d, __a)
|
|
{
|
|
__glibcxx_function_requires(_ConvertibleConcept<_Tp1*, _Tp*>)
|
|
// TODO requires _Deleter CopyConstructible and __d(__p) well-formed
|
|
__enable_shared_from_this_helper(_M_refcount, __p, __p);
|
|
}
|
|
|
|
/** @brief Constructs a %__shared_ptr instance that stores @a __p
|
|
* and shares ownership with @a __r.
|
|
* @param __r A %__shared_ptr.
|
|
* @param __p A pointer that will remain valid while @a *__r is valid.
|
|
* @post get() == __p && use_count() == __r.use_count()
|
|
*
|
|
* This can be used to construct a @c shared_ptr to a sub-object
|
|
* of an object managed by an existing @c shared_ptr.
|
|
*
|
|
* @code
|
|
* shared_ptr< pair<int,int> > pii(new pair<int,int>());
|
|
* shared_ptr<int> pi(pii, &pii->first);
|
|
* assert(pii.use_count() == 2);
|
|
* @endcode
|
|
*/
|
|
template<typename _Tp1>
|
|
__shared_ptr(const __shared_ptr<_Tp1, _Lp>& __r, _Tp* __p)
|
|
: _M_ptr(__p), _M_refcount(__r._M_refcount) // never throws
|
|
{ }
|
|
#endif
|
|
|
|
// 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()
|
|
*/
|
|
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*>) }
|
|
|
|
#ifdef _GLIBCXX_INCLUDE_AS_CXX0X
|
|
/** @brief Move-constructs a %__shared_ptr instance from @a __r.
|
|
* @param __r A %__shared_ptr rvalue.
|
|
* @post *this contains the old value of @a __r, @a __r is empty.
|
|
*/
|
|
__shared_ptr(__shared_ptr&& __r)
|
|
: _M_ptr(__r._M_ptr), _M_refcount() // never throws
|
|
{
|
|
_M_refcount._M_swap(__r._M_refcount);
|
|
__r._M_ptr = 0;
|
|
}
|
|
|
|
/** @brief Move-constructs a %__shared_ptr instance from @a __r.
|
|
* @param __r A %__shared_ptr rvalue.
|
|
* @post *this contains the old value of @a __r, @a __r is empty.
|
|
*/
|
|
template<typename _Tp1>
|
|
__shared_ptr(__shared_ptr<_Tp1, _Lp>&& __r)
|
|
: _M_ptr(__r._M_ptr), _M_refcount() // never throws
|
|
{
|
|
__glibcxx_function_requires(_ConvertibleConcept<_Tp1*, _Tp*>)
|
|
_M_refcount._M_swap(__r._M_refcount);
|
|
__r._M_ptr = 0;
|
|
}
|
|
#endif
|
|
|
|
/** @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;
|
|
}
|
|
|
|
/**
|
|
* @post use_count() == 1 and __r.get() == 0
|
|
*/
|
|
#if !defined(__GXX_EXPERIMENTAL_CXX0X__) || _GLIBCXX_DEPRECATED
|
|
template<typename _Tp1>
|
|
explicit
|
|
__shared_ptr(std::auto_ptr<_Tp1>& __r)
|
|
: _M_ptr(__r.get()), _M_refcount()
|
|
{
|
|
__glibcxx_function_requires(_ConvertibleConcept<_Tp1*, _Tp*>)
|
|
// TODO requires _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);
|
|
}
|
|
#endif
|
|
|
|
#ifdef _GLIBCXX_INCLUDE_AS_TR1
|
|
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>();
|
|
}
|
|
#endif
|
|
|
|
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;
|
|
}
|
|
|
|
#if !defined(__GXX_EXPERIMENTAL_CXX0X__) || _GLIBCXX_DEPRECATED
|
|
template<typename _Tp1>
|
|
__shared_ptr&
|
|
operator=(std::auto_ptr<_Tp1>& __r)
|
|
{
|
|
__shared_ptr(__r).swap(*this);
|
|
return *this;
|
|
}
|
|
#endif
|
|
|
|
#ifdef _GLIBCXX_INCLUDE_AS_CXX0X
|
|
__shared_ptr&
|
|
operator=(__shared_ptr&& __r)
|
|
{
|
|
__shared_ptr(std::move(__r)).swap(*this);
|
|
return *this;
|
|
}
|
|
|
|
template<class _Tp1>
|
|
__shared_ptr&
|
|
operator=(__shared_ptr<_Tp1, _Lp>&& __r)
|
|
{
|
|
__shared_ptr(std::move(__r)).swap(*this);
|
|
return *this;
|
|
}
|
|
#endif
|
|
|
|
void
|
|
reset() // never throws
|
|
{ __shared_ptr().swap(*this); }
|
|
|
|
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);
|
|
}
|
|
|
|
template<typename _Tp1, typename _Deleter>
|
|
void
|
|
reset(_Tp1* __p, _Deleter __d)
|
|
{ __shared_ptr(__p, __d).swap(*this); }
|
|
|
|
#ifdef _GLIBCXX_INCLUDE_AS_CXX0X
|
|
template<typename _Tp1, typename _Deleter, typename _Alloc>
|
|
void
|
|
reset(_Tp1* __p, _Deleter __d, const _Alloc& __a)
|
|
{ __shared_ptr(__p, __d, __a).swap(*this); }
|
|
|
|
// Allow class instantiation when _Tp is [cv-qual] void.
|
|
typename std::add_lvalue_reference<_Tp>::type
|
|
#else
|
|
// Allow class instantiation when _Tp is [cv-qual] void.
|
|
typename std::tr1::add_reference<_Tp>::type
|
|
#endif
|
|
operator*() const // never throws
|
|
{
|
|
_GLIBCXX_DEBUG_ASSERT(_M_ptr != 0);
|
|
return *_M_ptr;
|
|
}
|
|
|
|
_Tp*
|
|
operator->() const // never throws
|
|
{
|
|
_GLIBCXX_DEBUG_ASSERT(_M_ptr != 0);
|
|
return _M_ptr;
|
|
}
|
|
|
|
_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._M_unique(); }
|
|
|
|
long
|
|
use_count() const // never throws
|
|
{ return _M_refcount._M_get_use_count(); }
|
|
|
|
void
|
|
swap(__shared_ptr<_Tp, _Lp>& __other) // never throws
|
|
{
|
|
std::swap(_M_ptr, __other._M_ptr);
|
|
_M_refcount._M_swap(__other._M_refcount);
|
|
}
|
|
|
|
#ifdef _GLIBCXX_INCLUDE_AS_CXX0X
|
|
protected:
|
|
// This constructor is non-standard, it is used by allocate_shared.
|
|
template<typename _Alloc, typename... _Args>
|
|
__shared_ptr(_Sp_make_shared_tag __tag, _Alloc __a, _Args&&... __args)
|
|
: _M_ptr()
|
|
, _M_refcount(__tag, (_Tp*)0, __a, std::forward<_Args>(__args)...)
|
|
{
|
|
// _M_ptr needs to point to the newly constructed object.
|
|
// This relies on _Sp_counted_ptr_inplace::_M_get_deleter.
|
|
void * __p = _M_refcount._M_get_deleter(typeid(__tag));
|
|
_M_ptr = static_cast<_Tp*>(__p);
|
|
}
|
|
|
|
template<typename _Tp1, _Lock_policy _Lp1, typename _Alloc,
|
|
typename... _Args>
|
|
friend __shared_ptr<_Tp1, _Lp1>
|
|
__allocate_shared(_Alloc __a, _Args&&... __args);
|
|
#endif
|
|
|
|
private:
|
|
void*
|
|
_M_get_deleter(const std::type_info& __ti) const
|
|
{ return _M_refcount._M_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<_Tp, _Lp>(static_cast<_Tp*>(__r.get()))</code>
|
|
* will eventually result in undefined behaviour,
|
|
* attempting to delete the same object twice.
|
|
*/
|
|
template<typename _Tp, typename _Tp1, _Lock_policy _Lp>
|
|
inline __shared_ptr<_Tp, _Lp>
|
|
static_pointer_cast(const __shared_ptr<_Tp1, _Lp>& __r)
|
|
{
|
|
#ifdef _GLIBCXX_INCLUDE_AS_CXX0X
|
|
return __shared_ptr<_Tp, _Lp>(__r, static_cast<_Tp*>(__r.get()));
|
|
#else
|
|
return __shared_ptr<_Tp, _Lp>(__r, __static_cast_tag());
|
|
#endif
|
|
}
|
|
|
|
/** @warning The seemingly equivalent
|
|
* <code>shared_ptr<_Tp, _Lp>(const_cast<_Tp*>(__r.get()))</code>
|
|
* will eventually result in undefined behaviour,
|
|
* attempting to delete the same object twice.
|
|
*/
|
|
template<typename _Tp, typename _Tp1, _Lock_policy _Lp>
|
|
inline __shared_ptr<_Tp, _Lp>
|
|
const_pointer_cast(const __shared_ptr<_Tp1, _Lp>& __r)
|
|
{
|
|
#ifdef _GLIBCXX_INCLUDE_AS_CXX0X
|
|
return __shared_ptr<_Tp, _Lp>(__r, const_cast<_Tp*>(__r.get()));
|
|
#else
|
|
return __shared_ptr<_Tp, _Lp>(__r, __const_cast_tag());
|
|
#endif
|
|
}
|
|
|
|
/** @warning The seemingly equivalent
|
|
* <code>shared_ptr<_Tp, _Lp>(dynamic_cast<_Tp*>(__r.get()))</code>
|
|
* will eventually result in undefined behaviour,
|
|
* attempting to delete the same object twice.
|
|
*/
|
|
template<typename _Tp, typename _Tp1, _Lock_policy _Lp>
|
|
inline __shared_ptr<_Tp, _Lp>
|
|
dynamic_pointer_cast(const __shared_ptr<_Tp1, _Lp>& __r)
|
|
{
|
|
#ifdef _GLIBCXX_INCLUDE_AS_CXX0X
|
|
if (_Tp* __p = dynamic_cast<_Tp*>(__r.get()))
|
|
return __shared_ptr<_Tp, _Lp>(__r, __p);
|
|
return __shared_ptr<_Tp, _Lp>();
|
|
#else
|
|
return __shared_ptr<_Tp, _Lp>(__r, __dynamic_cast_tag());
|
|
#endif
|
|
}
|
|
|
|
// 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.
|
|
|
|
// The "obvious" converting constructor implementation:
|
|
//
|
|
// template<typename _Tp1>
|
|
// __weak_ptr(const __weak_ptr<_Tp1, _Lp>& __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&
|
|
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;
|
|
}
|
|
|
|
__shared_ptr<_Tp, _Lp>
|
|
lock() const // never throws
|
|
{
|
|
#ifdef __GTHREADS
|
|
// 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, _Lp>();
|
|
}
|
|
|
|
#else
|
|
// 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._M_get_use_count(); }
|
|
|
|
bool
|
|
expired() const // never throws
|
|
{ return _M_refcount._M_get_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._M_swap(__s._M_refcount);
|
|
}
|
|
|
|
private:
|
|
// Used by __enable_shared_from_this.
|
|
void
|
|
_M_assign(_Tp* __ptr, const __shared_count<_Lp>& __refcount)
|
|
{
|
|
_M_ptr = __ptr;
|
|
_M_refcount = __refcount;
|
|
}
|
|
|
|
template<typename _Tp1>
|
|
bool
|
|
_M_less(const __weak_ptr<_Tp1, _Lp>& __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;
|
|
friend class __enable_shared_from_this<_Tp, _Lp>;
|
|
friend class enable_shared_from_this<_Tp>;
|
|
|
|
// 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); }
|
|
|
|
_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>
|
|
inline void
|
|
swap(__weak_ptr<_Tp, _Lp>& __a, __weak_ptr<_Tp, _Lp>& __b)
|
|
{ __a.swap(__b); }
|
|
|
|
|
|
template<typename _Tp, _Lock_policy _Lp>
|
|
class __enable_shared_from_this
|
|
{
|
|
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; }
|
|
|
|
~__enable_shared_from_this() { }
|
|
|
|
public:
|
|
__shared_ptr<_Tp, _Lp>
|
|
shared_from_this()
|
|
{ return __shared_ptr<_Tp, _Lp>(this->_M_weak_this); }
|
|
|
|
__shared_ptr<const _Tp, _Lp>
|
|
shared_from_this() const
|
|
{ return __shared_ptr<const _Tp, _Lp>(this->_M_weak_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)
|
|
{
|
|
if (__pe != 0)
|
|
__pe->_M_weak_assign(const_cast<_Tp1*>(__px), __pn);
|
|
}
|
|
|
|
mutable __weak_ptr<_Tp, _Lp> _M_weak_this;
|
|
};
|
|
|
|
|
|
/// shared_ptr
|
|
// The actual 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) { }
|
|
|
|
#ifdef _GLIBCXX_INCLUDE_AS_CXX0X
|
|
template<typename _Tp1, typename _Deleter, typename _Alloc>
|
|
shared_ptr(_Tp1* __p, _Deleter __d, const _Alloc& __a)
|
|
: __shared_ptr<_Tp>(__p, __d, __a) { }
|
|
|
|
// Aliasing constructor
|
|
template<typename _Tp1>
|
|
shared_ptr(const shared_ptr<_Tp1>& __r, _Tp* __p)
|
|
: __shared_ptr<_Tp>(__r, __p) { }
|
|
#endif
|
|
|
|
template<typename _Tp1>
|
|
shared_ptr(const shared_ptr<_Tp1>& __r)
|
|
: __shared_ptr<_Tp>(__r) { }
|
|
|
|
#ifdef _GLIBCXX_INCLUDE_AS_CXX0X
|
|
shared_ptr(shared_ptr&& __r)
|
|
: __shared_ptr<_Tp>(std::move(__r)) { }
|
|
|
|
template<typename _Tp1>
|
|
shared_ptr(shared_ptr<_Tp1>&& __r)
|
|
: __shared_ptr<_Tp>(std::move(__r)) { }
|
|
#endif
|
|
|
|
template<typename _Tp1>
|
|
explicit
|
|
shared_ptr(const weak_ptr<_Tp1>& __r)
|
|
: __shared_ptr<_Tp>(__r) { }
|
|
|
|
#if !defined(__GXX_EXPERIMENTAL_CXX0X__) || _GLIBCXX_DEPRECATED
|
|
template<typename _Tp1>
|
|
explicit
|
|
shared_ptr(std::auto_ptr<_Tp1>& __r)
|
|
: __shared_ptr<_Tp>(__r) { }
|
|
#endif
|
|
|
|
#ifdef _GLIBCXX_INCLUDE_AS_TR1
|
|
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()) { }
|
|
#endif
|
|
|
|
template<typename _Tp1>
|
|
shared_ptr&
|
|
operator=(const shared_ptr<_Tp1>& __r) // never throws
|
|
{
|
|
this->__shared_ptr<_Tp>::operator=(__r);
|
|
return *this;
|
|
}
|
|
|
|
#if !defined(__GXX_EXPERIMENTAL_CXX0X__) || _GLIBCXX_DEPRECATED
|
|
template<typename _Tp1>
|
|
shared_ptr&
|
|
operator=(std::auto_ptr<_Tp1>& __r)
|
|
{
|
|
this->__shared_ptr<_Tp>::operator=(__r);
|
|
return *this;
|
|
}
|
|
#endif
|
|
|
|
#ifdef _GLIBCXX_INCLUDE_AS_CXX0X
|
|
shared_ptr&
|
|
operator=(shared_ptr&& __r)
|
|
{
|
|
this->__shared_ptr<_Tp>::operator=(std::move(__r));
|
|
return *this;
|
|
}
|
|
|
|
template<class _Tp1>
|
|
shared_ptr&
|
|
operator=(shared_ptr<_Tp1>&& __r)
|
|
{
|
|
this->__shared_ptr<_Tp>::operator=(std::move(__r));
|
|
return *this;
|
|
}
|
|
#endif
|
|
|
|
#ifdef _GLIBCXX_INCLUDE_AS_CXX0X
|
|
private:
|
|
// This constructor is non-standard, it is used by allocate_shared.
|
|
template<typename _Alloc, typename... _Args>
|
|
shared_ptr(_Sp_make_shared_tag __tag, _Alloc __a, _Args&&... __args)
|
|
: __shared_ptr<_Tp>(__tag, __a, std::forward<_Args>(__args)...)
|
|
{ }
|
|
|
|
template<typename _Tp1, typename _Alloc, typename... _Args>
|
|
friend shared_ptr<_Tp1>
|
|
allocate_shared(_Alloc __a, _Args&&... __args);
|
|
#endif
|
|
};
|
|
|
|
template<typename _Tp, typename _Tp1>
|
|
inline shared_ptr<_Tp>
|
|
static_pointer_cast(const shared_ptr<_Tp1>& __r)
|
|
{
|
|
#ifdef _GLIBCXX_INCLUDE_AS_CXX0X
|
|
return shared_ptr<_Tp>(__r, static_cast<_Tp*>(__r.get()));
|
|
#else
|
|
return shared_ptr<_Tp>(__r, __static_cast_tag());
|
|
#endif
|
|
}
|
|
|
|
template<typename _Tp, typename _Tp1>
|
|
inline shared_ptr<_Tp>
|
|
const_pointer_cast(const shared_ptr<_Tp1>& __r)
|
|
{
|
|
#ifdef _GLIBCXX_INCLUDE_AS_CXX0X
|
|
return shared_ptr<_Tp>(__r, const_cast<_Tp*>(__r.get()));
|
|
#else
|
|
return shared_ptr<_Tp>(__r, __const_cast_tag());
|
|
#endif
|
|
}
|
|
|
|
template<typename _Tp, typename _Tp1>
|
|
inline shared_ptr<_Tp>
|
|
dynamic_pointer_cast(const shared_ptr<_Tp1>& __r)
|
|
{
|
|
#ifdef _GLIBCXX_INCLUDE_AS_CXX0X
|
|
if (_Tp* __p = dynamic_cast<_Tp*>(__r.get()))
|
|
return shared_ptr<_Tp>(__r, __p);
|
|
return shared_ptr<_Tp>();
|
|
#else
|
|
return shared_ptr<_Tp>(__r, __dynamic_cast_tag());
|
|
#endif
|
|
}
|
|
|
|
|
|
/// weak_ptr
|
|
// The actual 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&
|
|
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;
|
|
}
|
|
|
|
shared_ptr<_Tp>
|
|
lock() const // never throws
|
|
{
|
|
#ifdef __GTHREADS
|
|
if (this->expired())
|
|
return shared_ptr<_Tp>();
|
|
|
|
try
|
|
{
|
|
return shared_ptr<_Tp>(*this);
|
|
}
|
|
catch(const bad_weak_ptr&)
|
|
{
|
|
return shared_ptr<_Tp>();
|
|
}
|
|
#else
|
|
return this->expired() ? shared_ptr<_Tp>()
|
|
: shared_ptr<_Tp>(*this);
|
|
#endif
|
|
}
|
|
};
|
|
|
|
/// enable_shared_from_this
|
|
template<typename _Tp>
|
|
class enable_shared_from_this
|
|
{
|
|
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; }
|
|
|
|
~enable_shared_from_this() { }
|
|
|
|
public:
|
|
shared_ptr<_Tp>
|
|
shared_from_this()
|
|
{ return shared_ptr<_Tp>(this->_M_weak_this); }
|
|
|
|
shared_ptr<const _Tp>
|
|
shared_from_this() const
|
|
{ return shared_ptr<const _Tp>(this->_M_weak_this); }
|
|
|
|
private:
|
|
template<typename _Tp1>
|
|
void
|
|
_M_weak_assign(_Tp1* __p, const __shared_count<>& __n) const
|
|
{ _M_weak_this._M_assign(__p, __n); }
|
|
|
|
template<typename _Tp1>
|
|
friend void
|
|
__enable_shared_from_this_helper(const __shared_count<>& __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> _M_weak_this;
|
|
};
|
|
|
|
#ifdef _GLIBCXX_INCLUDE_AS_CXX0X
|
|
template<typename _Tp, _Lock_policy _Lp, typename _Alloc, typename... _Args>
|
|
inline __shared_ptr<_Tp, _Lp>
|
|
__allocate_shared(_Alloc __a, _Args&&... __args)
|
|
{
|
|
return __shared_ptr<_Tp, _Lp>(_Sp_make_shared_tag(),
|
|
std::forward<_Alloc>(__a), std::forward<_Args>(__args)...);
|
|
}
|
|
|
|
template<typename _Tp, _Lock_policy _Lp, typename... _Args>
|
|
inline __shared_ptr<_Tp, _Lp>
|
|
__make_shared(_Args&&... __args)
|
|
{
|
|
typedef typename std::remove_const<_Tp>::type _Tp_nc;
|
|
return __allocate_shared<_Tp, _Lp>(std::allocator<_Tp_nc>(),
|
|
std::forward<_Args>(__args)...);
|
|
}
|
|
|
|
/** @brief Create an object that is owned by a shared_ptr.
|
|
* @param __a An allocator.
|
|
* @param __args Arguments for the @a _Tp object's constructor.
|
|
* @return A shared_ptr that owns the newly created object.
|
|
* @throw An exception thrown from @a _Alloc::allocate or from the
|
|
* constructor of @a _Tp.
|
|
*
|
|
* A copy of @a __a will be used to allocate memory for the shared_ptr
|
|
* and the new object.
|
|
*/
|
|
template<typename _Tp, typename _Alloc, typename... _Args>
|
|
inline shared_ptr<_Tp>
|
|
allocate_shared(_Alloc __a, _Args&&... __args)
|
|
{
|
|
return shared_ptr<_Tp>(_Sp_make_shared_tag(), std::forward<_Alloc>(__a),
|
|
std::forward<_Args>(__args)...);
|
|
}
|
|
|
|
/** @brief Create an object that is owned by a shared_ptr.
|
|
* @param __args Arguments for the @a _Tp object's constructor.
|
|
* @return A shared_ptr that owns the newly created object.
|
|
* @throw std::bad_alloc, or an exception thrown from the
|
|
* constructor of @a _Tp.
|
|
*/
|
|
template<typename _Tp, typename... _Args>
|
|
inline shared_ptr<_Tp>
|
|
make_shared(_Args&&... __args)
|
|
{
|
|
typedef typename std::remove_const<_Tp>::type _Tp_nc;
|
|
return allocate_shared<_Tp>(std::allocator<_Tp_nc>(),
|
|
std::forward<_Args>(__args)...);
|
|
}
|
|
#endif
|
|
|
|
_GLIBCXX_END_NAMESPACE_TR1
|
|
}
|