2005-03-24 Benjamin Kosnik <bkoz@redhat.com>

	* include/tr1/memory: Forward to...
	* include/tr1/boost_shared_ptr.h: ...here. Add Boost Software License.
	* include/Makefile.am (tr1_headers): Add boost_shared_ptr.h.
	* include/Makefile.in: Regenerate.
	* testsuite/tr1/2_general_utilities/memory/shared_ptr/cons/
	auto_ptr_neg.cc: Adjust line numbers.


git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@97003 138bc75d-0d04-0410-961f-82ee72b054a4

1 files changed, 4 insertions, 933 deletions

diff --git a/libstdc++-v3/include/tr1/memory b/libstdc++-v3/include/tr1/memory
index 64e2a900715..93d206e5c29 100644
--- a/libstdc++-v3/include/tr1/memory
+++ b/libstdc++-v3/include/tr1/memory
@@ -27,19 +27,6 @@
 // invalidate any other reasons why the executable file might be covered by
 // the GNU General Public License.
 
-//  boost/shared_count.hpp
-//  Copyright (c) 2001, 2002, 2003 Peter Dimov and Multi Media Ltd.
-
-//  shared_ptr.hpp
-//  (C) Copyright Greg Colvin and Beman Dawes 1998, 1999.
-//  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
-
 #ifndef _TR1_MEMORY
 #define _TR1_MEMORY 1
 
@@ -49,931 +36,15 @@
 #include <new>              // std::bad_alloc
 #include <typeinfo>         // std::type_info in get_deleter
 #include <cstddef>          // std::size_t
-#include <algorithm>        // for std::swap
-#include <iosfwd>           // for std::basic_ostream
-#include <cstdlib>          // for std::abort
+#include <algorithm>        // std::swap
+#include <iosfwd>           // std::basic_ostream
+#include <cstdlib>          // std::abort
 
 #include <bits/gthr.h>
 #include <bits/atomicity.h>
 #include <bits/functexcept.h>
 #include <debug/debug.h>
 
-// namespace std::tr1
-namespace std
-{
-namespace tr1
-{
-
-class bad_weak_ptr : public std::exception
-{
-public:
-
-  virtual char const* what() const throw()
-  {
-    return "tr1::bad_weak_ptr";
-  }
-};
-
-// Helper for exception objects in <tr1/memory>
-// TODO this should be defined in a different file.
-inline void
-__throw_bad_weak_ptr()
-{
-#if __EXCEPTIONS
-  throw bad_weak_ptr();
-#else
-  std::abort();
-#endif
-}
-
-
-template <typename _Tp>
-  struct _Sp_deleter
-  {
-    typedef void result_type;
-    typedef _Tp* argument_type;
-
-    void
-    operator()(_Tp* p) const
-    { delete p; }
-  };
-
-
-class _Sp_counted_base
-{
-public:
-
-  _Sp_counted_base()
-  : _M_use_count(1), _M_weak_count(1)
-  { }
-
-  virtual
-  ~_Sp_counted_base() // nothrow
-  { }
-
-  // dispose() is called when _M_use_count drops to zero, to release
-  // the resources managed by *this.
-  virtual void
-  dispose() = 0; // nothrow
-
-  // destroy() is 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()
-  {
-    if (_M_use_count <= 0) // TODO not yet MT safe XXX
-    {
-      __throw_bad_weak_ptr();
-    }
-    __gnu_cxx::__atomic_add(&_M_use_count, 1);
-  }
-
-  void
-  release() // nothrow
-  {
-    if (__gnu_cxx::__exchange_and_add(&_M_use_count, -1) <= 1)
-    {
-      dispose();
-      weak_release();
-    }
-  }
-
-  void
-  weak_add_ref() // nothrow
-  {
-    __gnu_cxx::__atomic_add(&_M_weak_count, 1);
-  }
-
-  void
-  weak_release() // nothrow
-  {
-    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:
-
-  _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 <typename _Ptr, typename _Deleter>
-class _Sp_counted_base_impl : public _Sp_counted_base
-{
-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&);
-
-  _Ptr     _M_ptr; // copy constructor must not throw
-  _Deleter _M_del; // copy constructor must not throw
-};
-
-class weak_count;
-
-class shared_count
-{
-private:
-
-  _Sp_counted_base* _M_pi;
-
-  friend class weak_count;
-
-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>(__p, __d);
-      }
-      catch(...)
-      {
-        __d(__p); // delete __p
-        __throw_exception_again;
-      }
-    }
-
-  // auto_ptr<_Tp> is special cased 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> >(
-            __r.get(), _Sp_deleter<_Tp>()
-            ))
-    { __r.release(); }
-
-  // throws bad_weak_ptr when __r.use_count() == 0
-  explicit shared_count(const weak_count& __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* __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;
-  }
-
-  void swap(shared_count& __r) // nothrow
-  {
-    _Sp_counted_base* __tmp = __r._M_pi;
-    __r._M_pi = _M_pi;
-    _M_pi = __tmp;
-  }
-
-  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; }
-
-  friend inline bool
-  operator<(const shared_count& __a, const shared_count& __b)
-  { return std::less<_Sp_counted_base*>()(__a._M_pi, __b._M_pi); }
-
-  void*
-  get_deleter(const std::type_info& __ti) const
-  { return _M_pi ? _M_pi->get_deleter(__ti) : 0; }
-};
-
-
-class weak_count
-{
-private:
-
-  _Sp_counted_base * _M_pi;
-
-  friend class shared_count;
-
-public:
-
-  weak_count()
-  : _M_pi(0) // nothrow
-  { }
-
-  weak_count(const shared_count& __r)
-  : _M_pi(__r._M_pi) // nothrow
-  {
-    if (_M_pi != 0)
-      _M_pi->weak_add_ref();
-  }
-
-  weak_count(const weak_count& __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&
-  operator=(const shared_count& __r) // nothrow
-  {
-    _Sp_counted_base* __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&
-  operator=(const weak_count& __r) // nothrow
-  {
-    _Sp_counted_base * __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& __r) // nothrow
-  {
-    _Sp_counted_base * __tmp = __r._M_pi;
-    __r._M_pi = _M_pi;
-    _M_pi = __tmp;
-  }
-
-  long
-  use_count() const // nothrow
-  { return _M_pi != 0 ? _M_pi->use_count() : 0; }
-
-  friend inline bool
-  operator==(const weak_count& __a, const weak_count& __b)
-  { return __a._M_pi == __b._M_pi; }
-
-  friend inline bool
-  operator<(const weak_count& __a, const weak_count& __b)
-  { return std::less<_Sp_counted_base*>()(__a._M_pi, __b._M_pi); }
-};
-
-inline
-shared_count::shared_count(const weak_count& __r)
-: _M_pi(__r._M_pi)
-{
-  if (_M_pi != 0)
-  {
-    _M_pi->add_ref_lock();
-  }
-  else
-  {
-    __throw_bad_weak_ptr();
-  }
-}
-
-// fwd decls
-template <typename _Tp> class weak_ptr;
-template <typename _Tp> class enable_shared_from_this;
-
-struct __static_cast_tag {};
-struct __const_cast_tag {};
-struct __dynamic_cast_tag {};
-struct __polymorphic_cast_tag {};
-
-template<class _Tp> struct shared_ptr_traits
-{
-    typedef _Tp & reference;
-};
-
-template<> struct shared_ptr_traits<void>
-{
-    typedef void reference;
-};
-
-template<> struct shared_ptr_traits<void const>
-{
-    typedef void reference;
-};
-
-template<> struct shared_ptr_traits<void volatile>
-{
-    typedef void reference;
-};
-
-template<> struct shared_ptr_traits<void const volatile>
-{
-    typedef void reference;
-};
-
-
-// enable_shared_from_this support
-
-// friend of enable_shared_from_this
-template <typename _Tp1, typename _Tp2>
-  void
-  __enable_shared_from_this( const shared_count& __pn,
-                             const enable_shared_from_this<_Tp1>* __pe,
-                             const _Tp2* __px );
-
-inline void
-__enable_shared_from_this(const shared_count&, ...)
-{ }
-
-/**
- *  @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>
-  class shared_ptr
-  {
-    typedef typename shared_ptr_traits<_Tp>::reference _Reference;
-
-  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, _Sp_deleter<_Tp1>())
-      {
-        __glibcxx_function_requires(_ConvertibleConcept<_Tp1*, _Tp*>)
-        // __glibcxx_function_requires(_CompleteConcept<_Tp1*>)
-
-        __enable_shared_from_this( _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( _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>& __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>& __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
-     */
-    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(__r);
-
-        __enable_shared_from_this( _M_refcount, __tmp, __tmp );
-      }
-
-    template <typename _Tp1>
-      shared_ptr(const shared_ptr<_Tp1>& __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>& __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>& __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();
-        }
-      }
-
-    template <typename _Tp1>
-      shared_ptr&
-      operator=(const shared_ptr<_Tp1>& __r) // never throws
-      {
-        _M_ptr = __r._M_ptr;
-        _M_refcount = __r._M_refcount; // shared_count::op= doesn't throw
-        return *this;
-      }
-
-    template <typename _Tp1>
-      shared_ptr&
-      operator=(std::auto_ptr<_Tp1>& __r)
-      {
-        shared_ptr(__r).swap(*this);
-        return *this;
-      }
-
-    void
-    reset() // never throws
-    { shared_ptr().swap(*this); }
-
-    template <typename _Tp1>
-      void
-      reset(_Tp1* __p) // _Tp1 must be complete
-      {
-        _GLIBCXX_DEBUG_ASSERT(__p == 0 || __p != _M_ptr); // catch self-reset errors
-        shared_ptr(__p).swap(*this);
-      }
-
-    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
-    {
-      _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.unique(); }
-
-    long
-    use_count() const // never throws
-    { return _M_refcount.use_count(); }
-
-    void
-    swap(shared_ptr<_Tp>& __other) // never throws
-    {
-      std::swap(_M_ptr, __other._M_ptr);
-      _M_refcount.swap(__other._M_refcount);
-    }
-
-  private:
-    template <typename _Tp1>
-      bool
-      _M_less(const shared_ptr<_Tp1>& __rhs) const
-      { return _M_refcount < __rhs._M_refcount; }
-
-    void*
-    _M_get_deleter(const std::type_info& __ti) const
-    { return _M_refcount.get_deleter(__ti); }
-
-    template <typename _Tp1> friend class shared_ptr;
-    template <typename _Tp1> friend class weak_ptr;
-
-    // friends injected into enclosing namespace and found by ADL:
-
-    // get_deleter (experimental)
-    template <typename _Del>
-      friend inline _Del*
-      get_deleter(const shared_ptr& __p)
-      { return static_cast<_Del*>(__p._M_get_deleter(typeid(_Del))); }
-
-    template <typename _Tp1>
-      friend inline bool
-      operator==(const shared_ptr& __a, const shared_ptr<_Tp1>& __b)
-      { return __a.get() == __b.get(); }
-
-    template <typename _Tp1>
-      friend inline bool
-      operator!=(const shared_ptr& __a, const shared_ptr<_Tp1>& __b)
-      { return __a.get() != __b.get(); }
-
-    template <typename _Tp1>
-      friend inline bool
-      operator<(const shared_ptr& __a, const shared_ptr<_Tp1>& __b)
-      { return __a._M_less(__b); }
-
-    _Tp*         _M_ptr;         // contained pointer
-    shared_count _M_refcount;    // reference counter
-  };  // shared_ptr
-
-// 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>
-  shared_ptr<_Tp>
-  static_pointer_cast(const shared_ptr<_Tp1>& __r)
-  {
-    return shared_ptr<_Tp>(__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>
-  shared_ptr<_Tp>
-  const_pointer_cast(const shared_ptr<_Tp1>& __r)
-  {
-    return shared_ptr<_Tp>(__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>
-  shared_ptr<_Tp>
-  dynamic_pointer_cast(const shared_ptr<_Tp1>& __r)
-  {
-    return shared_ptr<_Tp>(__r, __dynamic_cast_tag());
-  }
-
-// operator<<
-template <typename _Ch, typename _Tr, typename _Tp>
-  std::basic_ostream<_Ch,_Tr>&
-  operator<<(std::basic_ostream<_Ch,_Tr>& __os, const shared_ptr<_Tp>& __p)
-  {
-    __os << __p.get();
-    return __os;
-  }
-
-
-template <typename _Tp>
-  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<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>& 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>& 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>& 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>& r) // never throws
-      {
-        _M_ptr = r._M_ptr;
-        _M_refcount = r._M_refcount;
-        return *this;
-      }
-
-    shared_ptr<_Tp>
-    lock() const // never throws
-    {
-#ifdef __GTHREADS
-
-      // optimization: avoid throw overhead
-      if (expired())
-      {
-        return shared_ptr<element_type>();
-      }
-
-      try
-      {
-        return shared_ptr<element_type>(*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>() : shared_ptr<element_type>(*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; }
-
-    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);
-    }
-
-  private:
-
-    template <typename _Tp1>
-      bool
-      _M_less(const weak_ptr<_Tp1>& __rhs) const
-      { return _M_refcount < __rhs._M_refcount; }
-
-    // used by __enable_shared_from_this
-    void
-    _M_assign(_Tp* __ptr, const shared_count& __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>& __rhs)
-      { return __lhs._M_less(__rhs); }
-
-    template <typename _Tp1> friend class weak_ptr;
-    template <typename _Tp1> friend class shared_ptr;
-    friend class enable_shared_from_this<_Tp>;
-
-    _Tp*       _M_ptr;           // contained pointer
-    weak_count _M_refcount;      // reference counter
-
-  };  // weak_ptr
-
-
-
-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()
-    {
-      shared_ptr<_Tp> p(this->_M_weak_this);
-      return p;
-    }
-
-    shared_ptr<const _Tp>
-    shared_from_this() const
-    {
-      shared_ptr<const _Tp> p(this->_M_weak_this);
-      return p;
-    }
-
-  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( 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;
-  };
-
-} // namespace tr1
-
-/**
- *  @brief   std::swap() specialisation for shared_ptr.
- *  @relates shared_ptr.
- */
-template <typename _Tp>
-  inline void
-  swap(tr1::shared_ptr<_Tp>& __a, tr1::shared_ptr<_Tp>& __b)
-  {
-    __a.swap(__b);
-  }
-
-/**
- *  @brief   std::swap() specialisation for weak_ptr.
- *  @relates weak_ptr.
- */
-template <typename _Tp>
-  void
-  swap(tr1::weak_ptr<_Tp>& __a, tr1::weak_ptr<_Tp>& __b)
-  {
-    __a.swap(__b);
-  }
-
-} // namespace std
+#include <tr1/boost_shared_ptr.h>
 
 #endif