2009-11-06 Benjamin Kosnik <bkoz@redhat.com>

	* doc/doxygen/user.cfg.in: Adjust includes.

	* doc/doxygen/doxygroups.cc: Move group markup.
	* include/tr1_impl/regex: Change " to '. Add group markup.
	* include/std/utility: Same.
	* include/std/type_traits: Same.
	* include/std/streambuf: Same.
	* include/std/iosfwd: Same.
	* include/std/limits: Same.
	* include/std/sstream: Same.
	* include/profile/impl/profiler_state.h: Same.
	* include/profile/impl/profiler_hashtable_size.h: Same.
	* include/bits/stl_algobase.h: Same.
	* include/bits/stl_iterator_base_types.h: Same.
	* include/bits/stream_iterator.h: Same.
	* include/bits/stl_iterator.h: Same.
	* include/bits/stl_tempbuf.h: Same.
	* include/bits/streambuf_iterator.h: Same.
	* libsupc++/exception: Same.
	* libsupc++/cxxabi.h: Same.
	* include/tr1_impl/type_traits: Same.

	* include/parallel/multiway_merge.h: Change @__c to @c, @__f to @f.
	* include/parallel/list_partition.h: Same.
	* include/parallel/for_each.h: Same.
	* include/parallel/workstealing.h: Same.
	* include/parallel/base.h: Same.
	* include/parallel/equally_split.h: Same.
	* include/parallel/random_shuffle.h: Same.
	* include/parallel/balanced_quicksort.h: Same.
	* include/parallel/merge.h: Same.
	* include/parallel/multiway_mergesort.h: Same.
	* include/parallel/compatibility.h: Same.
	* include/parallel/queue.h: Same.
	* include/parallel/checkers.h: Same.
	* include/parallel/random_number.h: Same.


	* include/c_global/csignal: Change # to \#.
	* include/c_global/cstdlib: Same.
	* include/c_global/cstdio: Same.
	* include/c_global/cstdarg: Same.
	* include/c_global/cctype: Same.
	* include/c_global/cerrno: Same.
	* include/c_global/cstdatomic: Same.
	* include/c_global/cmath: Same.
	* include/c_global/ciso646: Same.
	* include/c_global/ctime: Same.
	* include/c_global/clocale: Same.
	* include/c_global/climits: Same.
	* include/c_global/cassert: Same.
	* include/c_global/csetjmp: Same.
	* include/c_global/cwchar: Same.
	* include/c_global/cfloat: Same.
	* include/c_global/cstring: Same.
	* include/c_global/cstddef: Same.
	* include/c_global/cwctype: Same.

	* include/std/memory: Only dance around boost_sp_counted_base.h.
	* include/tr1_impl/boost_sp_counted_base.h: Add markup.
	* include/tr1/shared_ptr.h: Strip markup.
	* include/bits/shared_ptr.h: Move base types...
	* include/bits/shared_ptr_base.h: ...here.
	* include/Makefile.am: Add.
	* include/Makefile.in: Regenerate.
	* configure: Same.
	* testsuite/20_util/make_signed/requirements/typedefs_neg.cc:
	Adjust line numbers.
	* testsuite/20_util/make_unsigned/requirements/typedefs_neg.cc: Same.



git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@153980 138bc75d-0d04-0410-961f-82ee72b054a4

1 files changed, 1114 insertions, 0 deletions

diff --git a/libstdc++-v3/include/bits/shared_ptr_base.h b/libstdc++-v3/include/bits/shared_ptr_base.h
new file mode 100644
index 00000000000..b8083e405c8
--- /dev/null
+++ b/libstdc++-v3/include/bits/shared_ptr_base.h
@@ -0,0 +1,1114 @@
+// shared_ptr and weak_ptr implementation details -*- C++ -*-
+
+// Copyright (C) 2007, 2008, 2009 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 3, 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.
+
+// Under Section 7 of GPL version 3, you are granted additional
+// permissions described in the GCC Runtime Library Exception, version
+// 3.1, as published by the Free Software Foundation.
+
+// You should have received a copy of the GNU General Public License and
+// a copy of the GCC Runtime Library Exception along with this program;
+// see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see
+// <http://www.gnu.org/licenses/>.
+
+// GCC Note: Based on files from version 1.32.0 of the Boost library.
+
+//  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)
+
+/** @file bits/shared_ptr_base.h
+ *  This is an internal header file, included by other library headers.
+ *  You should not attempt to use it directly.
+ */
+
+#ifndef _SHARED_PTR_BASE_H
+#define _SHARED_PTR_BASE_H 1
+
+_GLIBCXX_BEGIN_NAMESPACE(std)
+
+  // 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>
+    struct owner_less;
+
+  template<typename _Tp>
+    class enable_shared_from_this;
+
+  template<_Lock_policy _Lp = __default_lock_policy>
+    class __weak_count;
+
+  template<_Lock_policy _Lp = __default_lock_policy>
+    class __shared_count;
+
+
+  // Counted ptr with no deleter or allocator support
+  template<typename _Ptr, _Lock_policy _Lp>
+    class _Sp_counted_ptr : public _Sp_counted_base<_Lp>
+    {
+    public:
+      _Sp_counted_ptr(_Ptr __p)
+      : _M_ptr(__p) { }
+
+      virtual void
+      _M_dispose() // nothrow
+      { delete _M_ptr; }
+
+      virtual void
+      _M_destroy() // nothrow
+      { delete this; }
+
+      virtual void*
+      _M_get_deleter(const std::type_info& __ti)
+      { return 0; }
+
+      _Sp_counted_ptr(const _Sp_counted_ptr&) = delete;
+      _Sp_counted_ptr& operator=(const _Sp_counted_ptr&) = delete;
+
+    protected:
+      _Ptr             _M_ptr;  // copy constructor must not throw
+    };
+
+  // Support for custom deleter and/or allocator
+  template<typename _Ptr, typename _Deleter, typename _Alloc, _Lock_policy _Lp>
+    class _Sp_counted_deleter : public _Sp_counted_ptr<_Ptr, _Lp>
+    {
+      typedef typename _Alloc::template
+	  rebind<_Sp_counted_deleter>::other _My_alloc_type;
+
+      // Helper class that stores the Deleter and also acts as an allocator.
+      // Used to dispose of the owned pointer and the internal refcount
+      // Requires that copies of _Alloc can free each other's memory.
+      struct _My_Deleter
+      : public _My_alloc_type    // copy constructor must not throw
+      {
+	_Deleter _M_del;         // copy constructor must not throw
+	_My_Deleter(_Deleter __d, const _Alloc& __a)
+	  : _My_alloc_type(__a), _M_del(__d) { }
+      };
+
+    protected:
+      typedef _Sp_counted_ptr<_Ptr, _Lp> _Base_type;
+
+    public:
+      // __d(__p) must not throw.
+      _Sp_counted_deleter(_Ptr __p, _Deleter __d)
+      : _Base_type(__p), _M_del(__d, _Alloc()) { }
+
+      // __d(__p) must not throw.
+      _Sp_counted_deleter(_Ptr __p, _Deleter __d, const _Alloc& __a)
+      : _Base_type(__p), _M_del(__d, __a) { }
+
+      virtual void
+      _M_dispose() // nothrow
+      { _M_del._M_del(_Base_type::_M_ptr); }
+
+      virtual void
+      _M_destroy() // nothrow
+      {
+	_My_alloc_type __a(_M_del);
+	this->~_Sp_counted_deleter();
+	__a.deallocate(this, 1);
+      }
+
+      virtual void*
+      _M_get_deleter(const std::type_info& __ti)
+      { return __ti == typeid(_Deleter) ? &_M_del._M_del : 0; }
+
+    protected:
+      _My_Deleter      _M_del;  // copy constructor must not throw
+    };
+
+  // helpers for make_shared / allocate_shared
+
+  template<typename _Tp>
+    struct _Sp_destroy_inplace
+    {
+      void operator()(_Tp* __p) const { if (__p) __p->~_Tp(); }
+    };
+
+  struct _Sp_make_shared_tag { };
+
+  template<typename _Tp, typename _Alloc, _Lock_policy _Lp>
+    class _Sp_counted_ptr_inplace
+    : public _Sp_counted_deleter<_Tp*, _Sp_destroy_inplace<_Tp>, _Alloc, _Lp>
+    {
+      typedef _Sp_counted_deleter<_Tp*, _Sp_destroy_inplace<_Tp>, _Alloc, _Lp>
+	_Base_type;
+
+    public:
+      _Sp_counted_ptr_inplace(_Alloc __a)
+      : _Base_type(static_cast<_Tp*>(0), _Sp_destroy_inplace<_Tp>(), __a)
+      , _M_storage()
+      {
+	void* __p = &_M_storage;
+	::new (__p) _Tp();  // might throw
+	_Base_type::_Base_type::_M_ptr = static_cast<_Tp*>(__p);
+      }
+
+      template<typename... _Args>
+	_Sp_counted_ptr_inplace(_Alloc __a, _Args&&... __args)
+	: _Base_type(static_cast<_Tp*>(0), _Sp_destroy_inplace<_Tp>(), __a)
+	, _M_storage()
+	{
+	  void* __p = &_M_storage;
+	  ::new (__p) _Tp(std::forward<_Args>(__args)...);  // might throw
+	  _Base_type::_Base_type::_M_ptr = static_cast<_Tp*>(__p);
+	}
+
+      // Override because the allocator needs to know the dynamic type
+      virtual void
+      _M_destroy() // nothrow
+      {
+	typedef typename _Alloc::template
+	    rebind<_Sp_counted_ptr_inplace>::other _My_alloc_type;
+	_My_alloc_type __a(_Base_type::_M_del);
+	this->~_Sp_counted_ptr_inplace();
+	__a.deallocate(this, 1);
+      }
+
+      // Sneaky trick so __shared_ptr can get the managed pointer
+      virtual void*
+      _M_get_deleter(const std::type_info& __ti)
+      {
+	return __ti == typeid(_Sp_make_shared_tag)
+	       ? static_cast<void*>(&_M_storage)
+	       : _Base_type::_M_get_deleter(__ti);
+      }
+
+    private:
+      typename aligned_storage<sizeof(_Tp), alignment_of<_Tp>::value>::type
+	_M_storage;
+    };
+
+  template<_Lock_policy _Lp>
+    class __shared_count
+    {
+    public:
+      __shared_count() : _M_pi(0) // nothrow
+      { }
+
+      template<typename _Ptr>
+	__shared_count(_Ptr __p) : _M_pi(0)
+	{
+	  __try
+	    {
+	      _M_pi = new _Sp_counted_ptr<_Ptr, _Lp>(__p);
+	    }
+	  __catch(...)
+	    {
+	      delete __p;
+	      __throw_exception_again;
+	    }
+	}
+
+      template<typename _Ptr, typename _Deleter>
+	__shared_count(_Ptr __p, _Deleter __d) : _M_pi(0)
+	{
+	  // The allocator's value_type doesn't matter, will rebind it anyway.
+	  typedef std::allocator<int> _Alloc;
+	  typedef _Sp_counted_deleter<_Ptr, _Deleter, _Alloc, _Lp> _Sp_cd_type;
+	  typedef std::allocator<_Sp_cd_type> _Alloc2;
+	  _Alloc2 __a2;
+	  __try
+	    {
+	      _M_pi = __a2.allocate(1);
+	      ::new(static_cast<void*>(_M_pi)) _Sp_cd_type(__p, __d);
+	    }
+	  __catch(...)
+	    {
+	      __d(__p); // Call _Deleter on __p.
+	      if (_M_pi)
+		__a2.deallocate(static_cast<_Sp_cd_type*>(_M_pi), 1);
+	      __throw_exception_again;
+	    }
+	}
+
+      template<typename _Ptr, typename _Deleter, typename _Alloc>
+	__shared_count(_Ptr __p, _Deleter __d, _Alloc __a) : _M_pi(0)
+	{
+	  typedef _Sp_counted_deleter<_Ptr, _Deleter, _Alloc, _Lp> _Sp_cd_type;
+	  typedef typename _Alloc::template rebind<_Sp_cd_type>::other _Alloc2;
+	  _Alloc2 __a2(__a);
+	  __try
+	    {
+	      _M_pi = __a2.allocate(1);
+	      ::new(static_cast<void*>(_M_pi)) _Sp_cd_type(__p, __d, __a);
+	    }
+	  __catch(...)
+	    {
+	      __d(__p); // Call _Deleter on __p.
+	      if (_M_pi)
+		__a2.deallocate(static_cast<_Sp_cd_type*>(_M_pi), 1);
+	      __throw_exception_again;
+	    }
+	}
+
+      template<typename _Tp, typename _Alloc, typename... _Args>
+	__shared_count(_Sp_make_shared_tag, _Tp*, _Alloc __a, _Args&&... __args)
+	: _M_pi(0)
+	{
+	  typedef _Sp_counted_ptr_inplace<_Tp, _Alloc, _Lp> _Sp_cp_type;
+	  typedef typename _Alloc::template rebind<_Sp_cp_type>::other _Alloc2;
+	  _Alloc2 __a2(__a);
+	  __try
+	    {
+	      _M_pi = __a2.allocate(1);
+	      ::new(static_cast<void*>(_M_pi)) _Sp_cp_type(__a,
+		    std::forward<_Args>(__args)...);
+	    }
+	  __catch(...)
+	    {
+	      if (_M_pi)
+		__a2.deallocate(static_cast<_Sp_cp_type*>(_M_pi), 1);
+	      __throw_exception_again;
+	    }
+	}
+
+#if _GLIBCXX_DEPRECATED
+      // 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_ptr<_Tp*, _Lp>(__r.get()))
+	{ __r.release(); }
+#endif
+
+      // Special case for unique_ptr<_Tp,_Del> to provide the strong guarantee.
+      template<typename _Tp, typename _Del>
+	explicit __shared_count(std::unique_ptr<_Tp, _Del>&& __r)
+	: _M_pi(_S_create_from_up(std::move(__r)))
+	{ __r.release(); }
+
+      // Throw bad_weak_ptr when __r._M_get_use_count() == 0.
+      explicit __shared_count(const __weak_count<_Lp>& __r);
+
+      ~__shared_count() // nothrow
+      {
+	if (_M_pi != 0)
+	  _M_pi->_M_release();
+      }
+
+      __shared_count(const __shared_count& __r)
+      : _M_pi(__r._M_pi) // nothrow
+      {
+	if (_M_pi != 0)
+	  _M_pi->_M_add_ref_copy();
+      }
+
+      __shared_count&
+      operator=(const __shared_count& __r) // nothrow
+      {
+	_Sp_counted_base<_Lp>* __tmp = __r._M_pi;
+	if (__tmp != _M_pi)
+	  {
+	    if (__tmp != 0)
+	      __tmp->_M_add_ref_copy();
+	    if (_M_pi != 0)
+	      _M_pi->_M_release();
+	    _M_pi = __tmp;
+	  }
+	return *this;
+      }
+
+      void
+      _M_swap(__shared_count& __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; }
+
+      bool
+      _M_unique() const // nothrow
+      { return this->_M_get_use_count() == 1; }
+
+      void*
+      _M_get_deleter(const std::type_info& __ti) const
+      { return _M_pi ? _M_pi->_M_get_deleter(__ti) : 0; }
+
+      bool
+      _M_less(const __shared_count& __rhs) const
+      { return std::less<_Sp_counted_base<_Lp>*>()(this->_M_pi, __rhs._M_pi); }
+
+      bool
+      _M_less(const __weak_count<_Lp>& __rhs) const
+      { return std::less<_Sp_counted_base<_Lp>*>()(this->_M_pi, __rhs._M_pi); }
+
+      // Friend function injected into enclosing namespace and found by ADL
+      friend inline bool
+      operator==(const __shared_count& __a, const __shared_count& __b)
+      { return __a._M_pi == __b._M_pi; }
+
+    private:
+      friend class __weak_count<_Lp>;
+
+      template<typename _Tp, typename _Del>
+	static _Sp_counted_base<_Lp>*
+	_S_create_from_up(std::unique_ptr<_Tp, _Del>&& __r,
+	  typename std::enable_if<!std::is_reference<_Del>::value>::type* = 0)
+	{
+	  return new _Sp_counted_deleter<_Tp*, _Del, std::allocator<_Tp>,
+	    _Lp>(__r.get(), __r.get_deleter());
+	}
+
+      template<typename _Tp, typename _Del>
+	static _Sp_counted_base<_Lp>*
+	_S_create_from_up(std::unique_ptr<_Tp, _Del>&& __r,
+	  typename std::enable_if<std::is_reference<_Del>::value>::type* = 0)
+	{
+	  typedef typename std::remove_reference<_Del>::type _Del1;
+	  typedef std::reference_wrapper<_Del1> _Del2;
+	  return new _Sp_counted_deleter<_Tp*, _Del2, std::allocator<_Tp>,
+	    _Lp>(__r.get(), std::ref(__r.get_deleter()));
+	}
+
+      _Sp_counted_base<_Lp>*  _M_pi;
+    };
+
+
+  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; }
+
+      bool
+      _M_less(const __weak_count& __rhs) const
+      { return std::less<_Sp_counted_base<_Lp>*>()(this->_M_pi, __rhs._M_pi); }
+
+      bool
+      _M_less(const __shared_count<_Lp>& __rhs) const
+      { return std::less<_Sp_counted_base<_Lp>*>()(this->_M_pi, __rhs._M_pi); }
+
+      // Friend function injected into enclosing namespace and found by ADL
+      friend inline bool
+      operator==(const __weak_count& __a, const __weak_count& __b)
+      { return __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();
+    }
+
+
+  // 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>&, ...)
+    { }
+
+
+  template<typename _Tp, _Lock_policy _Lp>
+    class __shared_ptr
+    {
+    public:
+      typedef _Tp   element_type;
+
+      __shared_ptr() : _M_ptr(0), _M_refcount() // never throws
+      { }
+
+      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);
+	}
+
+      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);
+	}
+
+      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);
+	}
+
+      template<typename _Tp1>
+	__shared_ptr(const __shared_ptr<_Tp1, _Lp>& __r, _Tp* __p)
+	: _M_ptr(__p), _M_refcount(__r._M_refcount) // never throws
+	{ }
+
+      //  generated copy constructor, assignment, destructor are fine.
+
+      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*>) }
+
+      __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;
+      }
+
+      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;
+	}
+
+      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 _Del>
+	explicit __shared_ptr(const std::unique_ptr<_Tp1, _Del>&) = delete;
+
+      // If an exception is thrown this constructor has no effect.
+      template<typename _Tp1, typename _Del>
+	explicit __shared_ptr(std::unique_ptr<_Tp1, _Del>&& __r)
+	: _M_ptr(__r.get()), _M_refcount()
+	{
+	  __glibcxx_function_requires(_ConvertibleConcept<_Tp1*, _Tp*>)
+	  _Tp1* __tmp = __r.get();
+	  _M_refcount = __shared_count<_Lp>(std::move(__r));
+	  __enable_shared_from_this_helper(_M_refcount, __tmp, __tmp);
+	}
+
+#if _GLIBCXX_DEPRECATED
+      // Postcondition: use_count() == 1 and __r.get() == 0
+      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>(std::move(__r));
+	  __enable_shared_from_this_helper(_M_refcount, __tmp, __tmp);
+	}
+#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 _GLIBCXX_DEPRECATED
+      template<typename _Tp1>
+	__shared_ptr&
+	operator=(std::auto_ptr<_Tp1>&& __r)
+	{
+	  __shared_ptr(std::move(__r)).swap(*this);
+	  return *this;
+	}
+#endif
+
+      __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;
+	}
+
+      template<typename _Tp1, typename _Del>
+	__shared_ptr&
+	operator=(const std::unique_ptr<_Tp1, _Del>& __r) = delete;
+
+      template<typename _Tp1, typename _Del>
+	__shared_ptr&
+	operator=(std::unique_ptr<_Tp1, _Del>&& __r)
+	{
+	  __shared_ptr(std::move(__r)).swap(*this);
+	  return *this;
+	}
+
+      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); }
+
+      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
+      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; }
+
+      explicit operator bool() const // never throws
+      { return _M_ptr == 0 ? false : true; }
+
+      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);
+      }
+
+      template<typename _Tp1>
+	bool
+	owner_before(__shared_ptr<_Tp1, _Lp> const& __rhs) const
+	{ return _M_refcount._M_less(__rhs._M_refcount); }
+
+      template<typename _Tp1>
+	bool
+	owner_before(__weak_ptr<_Tp1, _Lp> const& __rhs) const
+	{ return _M_refcount._M_less(__rhs._M_refcount); }
+
+    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);
+	  __enable_shared_from_this_helper(_M_refcount, _M_ptr, _M_ptr);
+	}
+
+      template<typename _Tp1, _Lock_policy _Lp1, typename _Alloc,
+	       typename... _Args>
+	friend __shared_ptr<_Tp1, _Lp1>
+	__allocate_shared(_Alloc __a, _Args&&... __args);
+
+    private:
+      void*
+      _M_get_deleter(const std::type_info& __ti) const
+      { return _M_refcount._M_get_deleter(__ti); }
+
+      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>&);
+
+      _Tp*	   	   _M_ptr;         // Contained pointer.
+      __shared_count<_Lp>  _M_refcount;    // Reference counter.
+    };
+
+
+  // 20.8.13.2.7 shared_ptr comparisons
+  template<typename _Tp1, typename _Tp2, _Lock_policy _Lp>
+    inline bool
+    operator==(const __shared_ptr<_Tp1, _Lp>& __a,
+	       const __shared_ptr<_Tp2, _Lp>& __b)
+    { return __a.get() == __b.get(); }
+
+  template<typename _Tp1, typename _Tp2, _Lock_policy _Lp>
+    inline bool
+    operator!=(const __shared_ptr<_Tp1, _Lp>& __a,
+	       const __shared_ptr<_Tp2, _Lp>& __b)
+    { return __a.get() != __b.get(); }
+
+  template<typename _Tp1, typename _Tp2, _Lock_policy _Lp>
+    inline bool
+    operator<(const __shared_ptr<_Tp1, _Lp>& __a,
+	      const __shared_ptr<_Tp2, _Lp>& __b)
+    { return __a.get() < __b.get(); }
+
+  template<typename _Sp>
+    struct _Sp_less : public binary_function<_Sp, _Sp, bool>
+    {
+      bool
+      operator()(const _Sp& __lhs, const _Sp& __rhs) const
+      {
+	typedef typename _Sp::element_type element_type;
+	return std::less<element_type*>()(__lhs.get(), __rhs.get());
+      }
+    };
+
+  template<typename _Tp, _Lock_policy _Lp>
+    struct less<__shared_ptr<_Tp, _Lp>>
+    : public _Sp_less<__shared_ptr<_Tp, _Lp>>
+    { };
+
+  // XXX LessThanComparable<_Tp> concept should provide >, >= and <=
+  template<typename _Tp, _Lock_policy _Lp>
+    inline bool
+    operator>(const __shared_ptr<_Tp, _Lp>& __a,
+	      const __shared_ptr<_Tp, _Lp>& __b)
+    { return __a.get() > __b.get(); }
+
+  template<typename _Tp, _Lock_policy _Lp>
+    inline bool
+    operator>=(const __shared_ptr<_Tp, _Lp>& __a,
+	       const __shared_ptr<_Tp, _Lp>& __b)
+    { return __a.get() >= __b.get(); }
+
+  template<typename _Tp, _Lock_policy _Lp>
+    inline bool
+    operator<=(const __shared_ptr<_Tp, _Lp>& __a,
+	       const __shared_ptr<_Tp, _Lp>& __b)
+    { return __a.get() <= __b.get(); }
+
+  // 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
+
+  // The seemingly equivalent code:
+  // shared_ptr<_Tp, _Lp>(static_cast<_Tp*>(__r.get()))
+  // will eventually result in undefined behaviour, attempting to
+  // delete the same object twice.
+  /// static_pointer_cast
+  template<typename _Tp, typename _Tp1, _Lock_policy _Lp>
+    inline __shared_ptr<_Tp, _Lp>
+    static_pointer_cast(const __shared_ptr<_Tp1, _Lp>& __r)
+    { return __shared_ptr<_Tp, _Lp>(__r, static_cast<_Tp*>(__r.get())); }
+
+  // The seemingly equivalent code:
+  // shared_ptr<_Tp, _Lp>(const_cast<_Tp*>(__r.get()))
+  // will eventually result in undefined behaviour, attempting to
+  // delete the same object twice.
+  /// const_pointer_cast
+  template<typename _Tp, typename _Tp1, _Lock_policy _Lp>
+    inline __shared_ptr<_Tp, _Lp>
+    const_pointer_cast(const __shared_ptr<_Tp1, _Lp>& __r)
+    { return __shared_ptr<_Tp, _Lp>(__r, const_cast<_Tp*>(__r.get())); }
+
+  // The seemingly equivalent code:
+  // shared_ptr<_Tp, _Lp>(dynamic_cast<_Tp*>(__r.get()))
+  // will eventually result in undefined behaviour, attempting to
+  // delete the same object twice.
+  /// dynamic_pointer_cast
+  template<typename _Tp, typename _Tp1, _Lock_policy _Lp>
+    inline __shared_ptr<_Tp, _Lp>
+    dynamic_pointer_cast(const __shared_ptr<_Tp1, _Lp>& __r)
+    {
+      if (_Tp* __p = dynamic_cast<_Tp*>(__r.get()))
+	return __shared_ptr<_Tp, _Lp>(__r, __p);
+      return __shared_ptr<_Tp, _Lp>();
+    }
+
+
+  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; }
+
+      template<typename _Tp1>
+	bool
+	owner_before(const __shared_ptr<_Tp1, _Lp>& __rhs) const
+	{ return _M_refcount._M_less(__rhs._M_refcount); }
+
+      template<typename _Tp1>
+	bool
+	owner_before(const __weak_ptr<_Tp1, _Lp>& __rhs) const
+	{ return _M_refcount._M_less(__rhs._M_refcount); }
+
+      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);
+      }
+
+      // Comparisons
+      template<typename _Tp1>
+	bool operator<(const __weak_ptr<_Tp1, _Lp>&) const = delete;
+
+      template<typename _Tp1>
+	bool operator<=(const __weak_ptr<_Tp1, _Lp>&) const = delete;
+
+      template<typename _Tp1>
+	bool operator>(const __weak_ptr<_Tp1, _Lp>&) const = delete;
+
+      template<typename _Tp1>
+	bool operator>=(const __weak_ptr<_Tp1, _Lp>&) const = delete;
+
+    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, _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>;
+
+      _Tp*	 	 _M_ptr;         // Contained pointer.
+      __weak_count<_Lp>  _M_refcount;    // Reference counter.
+    };
+
+  // 20.8.13.3.7 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, typename _Tp1>
+    struct _Sp_owner_less : public binary_function<_Tp, _Tp, bool>
+    {
+      bool
+      operator()(const _Tp& __lhs, const _Tp& __rhs) const
+      { return __lhs.owner_before(__rhs); }
+
+      bool
+      operator()(const _Tp& __lhs, const _Tp1& __rhs) const
+      { return __lhs.owner_before(__rhs); }
+
+      bool
+      operator()(const _Tp1& __lhs, const _Tp& __rhs) const
+      { return __lhs.owner_before(__rhs); }
+    };
+
+  template<typename _Tp, _Lock_policy _Lp>
+    struct owner_less<__shared_ptr<_Tp, _Lp>>
+    : public _Sp_owner_less<__shared_ptr<_Tp, _Lp>, __weak_ptr<_Tp, _Lp>>
+    { };
+
+  template<typename _Tp, _Lock_policy _Lp>
+    struct owner_less<__weak_ptr<_Tp, _Lp>>
+    : public _Sp_owner_less<__weak_ptr<_Tp, _Lp>, __shared_ptr<_Tp, _Lp>>
+    { };
+
+
+  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;
+    };
+
+
+  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)...);
+    }
+
+_GLIBCXX_END_NAMESPACE
+
+#endif // _SHARED_PTR_BASE_H