arm-marvell-linux-uclibcgnueabi/include/c++/4.6.4/bits/unique_ptr.h - toolchains/armada - Git at Google

 // unique_ptr implementation -*- C++ -*-

 // Copyright (C) 2008, 2009, 2010, 2011 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/>.

 /** @file bits/unique_ptr.h
  *  This is an internal header file, included by other library headers.
  *  Do not attempt to use it directly. @headername{memory}
  */

 #ifndef _UNIQUE_PTR_H
 #define _UNIQUE_PTR_H 1

 #include <bits/c++config.h>
 #include <debug/debug.h>
 #include <type_traits>
 #include <utility>
 #include <tuple>

 namespace std _GLIBCXX_VISIBILITY(default)
 {
 _GLIBCXX_BEGIN_NAMESPACE_VERSION

   /**
    * @addtogroup pointer_abstractions
    * @{
    */

   /// Primary template, default_delete.
   template<typename _Tp>
     struct default_delete
     {
       constexpr default_delete() = default;

       template<typename _Up, typename = typename
 	       std::enable_if<std::is_convertible<_Up*, _Tp*>::value>::type>
         default_delete(const default_delete<_Up>&) { }

       void
       operator()(_Tp* __ptr) const
       {
 	static_assert(sizeof(_Tp)>0,
 		      "can't delete pointer to incomplete type");
 	delete __ptr;
       }
     };

   // _GLIBCXX_RESOLVE_LIB_DEFECTS
   // DR 740 - omit specialization for array objects with a compile time length
   /// Specialization, default_delete.
   template<typename _Tp>
     struct default_delete<_Tp[]>
     {
       constexpr default_delete() = default;

       void
       operator()(_Tp* __ptr) const
       {
 	static_assert(sizeof(_Tp)>0,
 		      "can't delete pointer to incomplete type");
 	delete [] __ptr;
       }

       template<typename _Up> void operator()(_Up*) const = delete;
     };

   /// 20.7.12.2 unique_ptr for single objects.
   template <typename _Tp, typename _Dp = default_delete<_Tp> >
     class unique_ptr
     {
       // use SFINAE to determine whether _Del::pointer exists
       class _Pointer
       {
 	template<typename _Up>
 	  static typename _Up::pointer __test(typename _Up::pointer*);

 	template<typename _Up>
 	  static _Tp* __test(...);

 	typedef typename remove_reference<_Dp>::type _Del;

       public:
 	typedef decltype( __test<_Del>(0)) type;
       };

       typedef std::tuple<typename _Pointer::type, _Dp>  __tuple_type;
       __tuple_type                                      _M_t;

     public:
       typedef typename _Pointer::type   pointer;
       typedef _Tp                       element_type;
       typedef _Dp                       deleter_type;

       // Constructors.
       constexpr unique_ptr()
       : _M_t()
       { static_assert(!std::is_pointer<deleter_type>::value,
 		     "constructed with null function pointer deleter"); }

       explicit
       unique_ptr(pointer __p)
       : _M_t(__p, deleter_type())
       { static_assert(!std::is_pointer<deleter_type>::value,
 		     "constructed with null function pointer deleter"); }

       unique_ptr(pointer __p,
 	  typename std::conditional<std::is_reference<deleter_type>::value,
 	    deleter_type, const deleter_type&>::type __d)
       : _M_t(__p, __d) { }

       unique_ptr(pointer __p,
 	  typename std::remove_reference<deleter_type>::type&& __d)
       : _M_t(std::move(__p), std::move(__d))
       { static_assert(!std::is_reference<deleter_type>::value,
 		      "rvalue deleter bound to reference"); }

       constexpr unique_ptr(nullptr_t)
       : _M_t()
       { static_assert(!std::is_pointer<deleter_type>::value,
 		     "constructed with null function pointer deleter"); }

       // Move constructors.
       unique_ptr(unique_ptr&& __u)
       : _M_t(__u.release(), std::forward<deleter_type>(__u.get_deleter())) { }

       template<typename _Up, typename _Ep, typename = typename
 	std::enable_if
 	  <std::is_convertible<typename unique_ptr<_Up, _Ep>::pointer,
 			       pointer>::value
 	   && !std::is_array<_Up>::value
 	   && ((std::is_reference<_Dp>::value
 		&& std::is_same<_Ep, _Dp>::value)
 	       || (!std::is_reference<_Dp>::value
 		   && std::is_convertible<_Ep, _Dp>::value))>
 	     ::type>
 	unique_ptr(unique_ptr<_Up, _Ep>&& __u)
 	: _M_t(__u.release(), std::forward<_Ep>(__u.get_deleter()))
 	{ }

 #if _GLIBCXX_USE_DEPRECATED
       template<typename _Up, typename = typename
 	std::enable_if<std::is_convertible<_Up*, _Tp*>::value
 		       && std::is_same<_Dp,
 				       default_delete<_Tp>>::value>::type>
 	unique_ptr(auto_ptr<_Up>&& __u)
 	: _M_t(__u.release(), deleter_type()) { }
 #endif

       // Destructor.
       ~unique_ptr() { reset(); }

       // Assignment.
       unique_ptr&
       operator=(unique_ptr&& __u)
       {
 	reset(__u.release());
 	get_deleter() = std::forward<deleter_type>(__u.get_deleter());
 	return *this;
       }

       template<typename _Up, typename _Ep, typename = typename
 	std::enable_if
 	  <std::is_convertible<typename unique_ptr<_Up, _Ep>::pointer,
 			       pointer>::value
 	   && !std::is_array<_Up>::value>::type>
 	unique_ptr&
 	operator=(unique_ptr<_Up, _Ep>&& __u)
 	{
 	  reset(__u.release());
 	  get_deleter() = std::forward<_Ep>(__u.get_deleter());
 	  return *this;
 	}

       unique_ptr&
       operator=(nullptr_t)
       {
 	reset();
 	return *this;
       }

       // Observers.
       typename std::add_lvalue_reference<element_type>::type
       operator*() const
       {
 	_GLIBCXX_DEBUG_ASSERT(get() != pointer());
 	return *get();
       }

       pointer
       operator->() const
       {
 	_GLIBCXX_DEBUG_ASSERT(get() != pointer());
 	return get();
       }

       pointer
       get() const
       { return std::get<0>(_M_t); }

       deleter_type&
       get_deleter()
       { return std::get<1>(_M_t); }

       const deleter_type&
       get_deleter() const
       { return std::get<1>(_M_t); }

       explicit operator bool() const
       { return get() == pointer() ? false : true; }

       // Modifiers.
       pointer
       release()
       {
 	pointer __p = get();
 	std::get<0>(_M_t) = pointer();
 	return __p;
       }

       void
       reset(pointer __p = pointer())
       {
 	using std::swap;
 	swap(std::get<0>(_M_t), __p);
 	if (__p != pointer())
 	  get_deleter()(__p);
       }

       void
       swap(unique_ptr& __u)
       {
 	using std::swap;
 	swap(_M_t, __u._M_t);
       }

       // Disable copy from lvalue.
       unique_ptr(const unique_ptr&) = delete;
       unique_ptr& operator=(const unique_ptr&) = delete;
   };

   /// 20.7.12.3 unique_ptr for array objects with a runtime length
   // [unique.ptr.runtime]
   // _GLIBCXX_RESOLVE_LIB_DEFECTS
   // DR 740 - omit specialization for array objects with a compile time length
   template<typename _Tp, typename _Dp>
     class unique_ptr<_Tp[], _Dp>
     {
       typedef std::tuple<_Tp*, _Dp>  	__tuple_type;
       __tuple_type 			_M_t;

     public:
       typedef _Tp*		 	pointer;
       typedef _Tp		 	element_type;
       typedef _Dp                       deleter_type;

       // Constructors.
       constexpr unique_ptr()
       : _M_t()
       { static_assert(!std::is_pointer<deleter_type>::value,
 		     "constructed with null function pointer deleter"); }

       explicit
       unique_ptr(pointer __p)
       : _M_t(__p, deleter_type())
       { static_assert(!std::is_pointer<deleter_type>::value,
 		     "constructed with null function pointer deleter"); }

       unique_ptr(pointer __p,
 	  typename std::conditional<std::is_reference<deleter_type>::value,
 	      deleter_type, const deleter_type&>::type __d)
       : _M_t(__p, __d) { }

       unique_ptr(pointer __p,
 		 typename std::remove_reference<deleter_type>::type && __d)
       : _M_t(std::move(__p), std::move(__d))
       { static_assert(!std::is_reference<deleter_type>::value,
 		      "rvalue deleter bound to reference"); }

       constexpr unique_ptr(nullptr_t)
       : _M_t()
       { static_assert(!std::is_pointer<deleter_type>::value,
 		     "constructed with null function pointer deleter"); }

       // Move constructors.
       unique_ptr(unique_ptr&& __u)
       : _M_t(__u.release(), std::forward<deleter_type>(__u.get_deleter())) { }

       template<typename _Up, typename _Ep>
 	unique_ptr(unique_ptr<_Up, _Ep>&& __u)
 	: _M_t(__u.release(), std::forward<_Ep>(__u.get_deleter()))
 	{ }

       // Destructor.
       ~unique_ptr() { reset(); }

       // Assignment.
       unique_ptr&
       operator=(unique_ptr&& __u)
       {
 	reset(__u.release());
 	get_deleter() = std::forward<deleter_type>(__u.get_deleter());
 	return *this;
       }

       template<typename _Up, typename _Ep>
 	unique_ptr&
 	operator=(unique_ptr<_Up, _Ep>&& __u)
 	{
 	  reset(__u.release());
 	  get_deleter() = std::forward<_Ep>(__u.get_deleter());
 	  return *this;
 	}

       unique_ptr&
       operator=(nullptr_t)
       {
 	reset();
 	return *this;
       }

       // Observers.
       typename std::add_lvalue_reference<element_type>::type
       operator[](size_t __i) const
       {
 	_GLIBCXX_DEBUG_ASSERT(get() != pointer());
 	return get()[__i];
       }

       pointer
       get() const
       { return std::get<0>(_M_t); }

       deleter_type&
       get_deleter()
       { return std::get<1>(_M_t); }

       const deleter_type&
       get_deleter() const
       { return std::get<1>(_M_t); }

       explicit operator bool() const
       { return get() == pointer() ? false : true; }

       // Modifiers.
       pointer
       release()
       {
 	pointer __p = get();
 	std::get<0>(_M_t) = pointer();
 	return __p;
       }

       void
       reset(pointer __p = pointer())
       {
 	using std::swap;
 	swap(std::get<0>(_M_t), __p);
 	if (__p != nullptr)
 	  get_deleter()(__p);
       }

       void
       reset(nullptr_t)
       {
 	pointer __p = get();
 	std::get<0>(_M_t) = pointer();
 	if (__p != nullptr)
 	  get_deleter()(__p);
       }

       // DR 821.
       template<typename _Up>
 	void reset(_Up) = delete;

       void
       swap(unique_ptr& __u)
       {
 	using std::swap;
 	swap(_M_t, __u._M_t);
       }

       // Disable copy from lvalue.
       unique_ptr(const unique_ptr&) = delete;
       unique_ptr& operator=(const unique_ptr&) = delete;

       // Disable construction from convertible pointer types.
       // (N2315 - 20.6.5.3.1)
       template<typename _Up>
 	unique_ptr(_Up*, typename
 		   std::conditional<std::is_reference<deleter_type>::value,
 		   deleter_type, const deleter_type&>::type,
 		   typename std::enable_if<std::is_convertible<_Up*,
 		   pointer>::value>::type* = 0) = delete;

       template<typename _Up>
 	unique_ptr(_Up*, typename std::remove_reference<deleter_type>::type&&,
 		   typename std::enable_if<std::is_convertible<_Up*,
 		   pointer>::value>::type* = 0) = delete;

       template<typename _Up>
 	explicit
 	unique_ptr(_Up*, typename std::enable_if<std::is_convertible<_Up*,
 		   pointer>::value>::type* = 0) = delete;
   };

   template<typename _Tp, typename _Dp>
     inline void
     swap(unique_ptr<_Tp, _Dp>& __x,
 	 unique_ptr<_Tp, _Dp>& __y)
     { __x.swap(__y); }

   template<typename _Tp, typename _Dp,
 	   typename _Up, typename _Ep>
     inline bool
     operator==(const unique_ptr<_Tp, _Dp>& __x,
 	       const unique_ptr<_Up, _Ep>& __y)
     { return __x.get() == __y.get(); }

   template<typename _Tp, typename _Dp>
     inline bool
     operator==(const unique_ptr<_Tp, _Dp>& __x, nullptr_t)
     { return __x.get() == nullptr; }

   template<typename _Tp, typename _Dp>
     inline bool
     operator==(nullptr_t, const unique_ptr<_Tp, _Dp>& __y)
     { return nullptr == __y.get(); }

   template<typename _Tp, typename _Dp,
 	   typename _Up, typename _Ep>
     inline bool
     operator!=(const unique_ptr<_Tp, _Dp>& __x,
 	       const unique_ptr<_Up, _Ep>& __y)
     { return !(__x.get() == __y.get()); }

   template<typename _Tp, typename _Dp>
     inline bool
     operator!=(const unique_ptr<_Tp, _Dp>& __x, nullptr_t)
     { return __x.get() != nullptr; }

   template<typename _Tp, typename _Dp>
     inline bool
     operator!=(nullptr_t, const unique_ptr<_Tp, _Dp>& __y)
     { return nullptr != __y.get(); }

   template<typename _Tp, typename _Dp,
 	   typename _Up, typename _Ep>
     inline bool
     operator<(const unique_ptr<_Tp, _Dp>& __x,
 	      const unique_ptr<_Up, _Ep>& __y)
     { return __x.get() < __y.get(); }

   template<typename _Tp, typename _Dp,
 	   typename _Up, typename _Ep>
     inline bool
     operator<=(const unique_ptr<_Tp, _Dp>& __x,
 	       const unique_ptr<_Up, _Ep>& __y)
     { return !(__y.get() < __x.get()); }

   template<typename _Tp, typename _Dp,
 	   typename _Up, typename _Ep>
     inline bool
     operator>(const unique_ptr<_Tp, _Dp>& __x,
 	      const unique_ptr<_Up, _Ep>& __y)
     { return __y.get() < __x.get(); }

   template<typename _Tp, typename _Dp,
 	   typename _Up, typename _Ep>
     inline bool
     operator>=(const unique_ptr<_Tp, _Dp>& __x,
 	       const unique_ptr<_Up, _Ep>& __y)
     { return !(__x.get() < __y.get()); }

   /// std::hash specialization for unique_ptr.
   template<typename _Tp, typename _Dp>
     struct hash<unique_ptr<_Tp, _Dp>>
     : public std::unary_function<unique_ptr<_Tp, _Dp>, size_t>
     {
       size_t
       operator()(const unique_ptr<_Tp, _Dp>& __u) const
       {
 	typedef unique_ptr<_Tp, _Dp> _UP;
 	return std::hash<typename _UP::pointer>()(__u.get());
       }
     };

   // @} group pointer_abstractions

 _GLIBCXX_END_NAMESPACE_VERSION
 } // namespace

 #endif /* _UNIQUE_PTR_H */
	// unique_ptr implementation -- C++ --

	// Copyright (C) 2008, 2009, 2010, 2011 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/>.

	/** @file bits/unique_ptr.h
	* This is an internal header file, included by other library headers.
	* Do not attempt to use it directly. @headername{memory}
	*/

	#ifndef _UNIQUE_PTR_H
	#define _UNIQUE_PTR_H 1

	#include <bits/c++config.h>
	#include <debug/debug.h>
	#include <type_traits>
	#include <utility>
	#include <tuple>

	namespace std _GLIBCXX_VISIBILITY(default)
	{
	_GLIBCXX_BEGIN_NAMESPACE_VERSION

	/**
	* @addtogroup pointer_abstractions
	* @{
	*/

	/// Primary template, default_delete.
	template<typename _Tp>
	struct default_delete
	{
	constexpr default_delete() = default;

	template<typename _Up, typename = typename
	std::enable_if<std::is_convertible<_Up, _Tp>::value>::type>
	default_delete(const default_delete<_Up>&) { }

	void
	operator()(_Tp* __ptr) const
	{
	static_assert(sizeof(_Tp)>0,
	"can't delete pointer to incomplete type");
	delete __ptr;
	}
	};

	// _GLIBCXX_RESOLVE_LIB_DEFECTS
	// DR 740 - omit specialization for array objects with a compile time length
	/// Specialization, default_delete.
	template<typename _Tp>
	struct default_delete<_Tp[]>
	{
	constexpr default_delete() = default;

	void
	operator()(_Tp* __ptr) const
	{
	static_assert(sizeof(_Tp)>0,
	"can't delete pointer to incomplete type");
	delete [] __ptr;
	}

	template<typename _Up> void operator()(_Up*) const = delete;
	};

	/// 20.7.12.2 unique_ptr for single objects.
	template <typename _Tp, typename _Dp = default_delete<_Tp> >
	class unique_ptr
	{
	// use SFINAE to determine whether _Del::pointer exists
	class _Pointer
	{
	template<typename _Up>
	static typename _Up::pointer __test(typename _Up::pointer*);

	template<typename _Up>
	static _Tp* __test(...);

	typedef typename remove_reference<_Dp>::type _Del;

	public:
	typedef decltype( __test<_Del>(0)) type;
	};

	typedef std::tuple<typename _Pointer::type, _Dp> __tuple_type;
	__tuple_type _M_t;

	public:
	typedef typename _Pointer::type pointer;
	typedef _Tp element_type;
	typedef _Dp deleter_type;

	// Constructors.
	constexpr unique_ptr()
	: _M_t()
	{ static_assert(!std::is_pointer<deleter_type>::value,
	"constructed with null function pointer deleter"); }

	explicit
	unique_ptr(pointer __p)
	: _M_t(__p, deleter_type())
	{ static_assert(!std::is_pointer<deleter_type>::value,
	"constructed with null function pointer deleter"); }

	unique_ptr(pointer __p,
	typename std::conditional<std::is_reference<deleter_type>::value,
	deleter_type, const deleter_type&>::type __d)
	: _M_t(__p, __d) { }

	unique_ptr(pointer __p,
	typename std::remove_reference<deleter_type>::type&& __d)
	: _M_t(std::move(__p), std::move(__d))
	{ static_assert(!std::is_reference<deleter_type>::value,
	"rvalue deleter bound to reference"); }

	constexpr unique_ptr(nullptr_t)
	: _M_t()
	{ static_assert(!std::is_pointer<deleter_type>::value,
	"constructed with null function pointer deleter"); }

	// Move constructors.
	unique_ptr(unique_ptr&& __u)
	: _M_t(__u.release(), std::forward<deleter_type>(__u.get_deleter())) { }

	template<typename _Up, typename _Ep, typename = typename
	std::enable_if
	<std::is_convertible<typename unique_ptr<_Up, _Ep>::pointer,
	pointer>::value
	&& !std::is_array<_Up>::value
	&& ((std::is_reference<_Dp>::value
	&& std::is_same<_Ep, _Dp>::value)
	\|\| (!std::is_reference<_Dp>::value
	&& std::is_convertible<_Ep, _Dp>::value))>
	::type>
	unique_ptr(unique_ptr<_Up, _Ep>&& __u)
	: _M_t(__u.release(), std::forward<_Ep>(__u.get_deleter()))
	{ }

	#if _GLIBCXX_USE_DEPRECATED
	template<typename _Up, typename = typename
	std::enable_if<std::is_convertible<_Up, _Tp>::value
	&& std::is_same<_Dp,
	default_delete<_Tp>>::value>::type>
	unique_ptr(auto_ptr<_Up>&& __u)
	: _M_t(__u.release(), deleter_type()) { }
	#endif

	// Destructor.
	~unique_ptr() { reset(); }

	// Assignment.
	unique_ptr&
	operator=(unique_ptr&& __u)
	{
	reset(__u.release());
	get_deleter() = std::forward<deleter_type>(__u.get_deleter());
	return *this;
	}

	template<typename _Up, typename _Ep, typename = typename
	std::enable_if
	<std::is_convertible<typename unique_ptr<_Up, _Ep>::pointer,
	pointer>::value
	&& !std::is_array<_Up>::value>::type>
	unique_ptr&
	operator=(unique_ptr<_Up, _Ep>&& __u)
	{
	reset(__u.release());
	get_deleter() = std::forward<_Ep>(__u.get_deleter());
	return *this;
	}

	unique_ptr&
	operator=(nullptr_t)
	{
	reset();
	return *this;
	}

	// Observers.
	typename std::add_lvalue_reference<element_type>::type
	operator*() const
	{
	_GLIBCXX_DEBUG_ASSERT(get() != pointer());
	return *get();
	}

	pointer
	operator->() const
	{
	_GLIBCXX_DEBUG_ASSERT(get() != pointer());
	return get();
	}

	pointer
	get() const
	{ return std::get<0>(_M_t); }

	deleter_type&
	get_deleter()
	{ return std::get<1>(_M_t); }

	const deleter_type&
	get_deleter() const
	{ return std::get<1>(_M_t); }

	explicit operator bool() const
	{ return get() == pointer() ? false : true; }

	// Modifiers.
	pointer
	release()
	{
	pointer __p = get();
	std::get<0>(_M_t) = pointer();
	return __p;
	}

	void
	reset(pointer __p = pointer())
	{
	using std::swap;
	swap(std::get<0>(_M_t), __p);
	if (__p != pointer())
	get_deleter()(__p);
	}

	void
	swap(unique_ptr& __u)
	{
	using std::swap;
	swap(_M_t, __u._M_t);
	}

	// Disable copy from lvalue.
	unique_ptr(const unique_ptr&) = delete;
	unique_ptr& operator=(const unique_ptr&) = delete;
	};

	/// 20.7.12.3 unique_ptr for array objects with a runtime length
	// [unique.ptr.runtime]
	// _GLIBCXX_RESOLVE_LIB_DEFECTS
	// DR 740 - omit specialization for array objects with a compile time length
	template<typename _Tp, typename _Dp>
	class unique_ptr<_Tp[], _Dp>
	{
	typedef std::tuple<_Tp*, _Dp> __tuple_type;
	__tuple_type _M_t;

	public:
	typedef _Tp* pointer;
	typedef _Tp element_type;
	typedef _Dp deleter_type;

	// Constructors.
	constexpr unique_ptr()
	: _M_t()
	{ static_assert(!std::is_pointer<deleter_type>::value,
	"constructed with null function pointer deleter"); }

	explicit
	unique_ptr(pointer __p)
	: _M_t(__p, deleter_type())
	{ static_assert(!std::is_pointer<deleter_type>::value,
	"constructed with null function pointer deleter"); }

	unique_ptr(pointer __p,
	typename std::conditional<std::is_reference<deleter_type>::value,
	deleter_type, const deleter_type&>::type __d)
	: _M_t(__p, __d) { }

	unique_ptr(pointer __p,
	typename std::remove_reference<deleter_type>::type && __d)
	: _M_t(std::move(__p), std::move(__d))
	{ static_assert(!std::is_reference<deleter_type>::value,
	"rvalue deleter bound to reference"); }

	constexpr unique_ptr(nullptr_t)
	: _M_t()
	{ static_assert(!std::is_pointer<deleter_type>::value,
	"constructed with null function pointer deleter"); }

	// Move constructors.
	unique_ptr(unique_ptr&& __u)
	: _M_t(__u.release(), std::forward<deleter_type>(__u.get_deleter())) { }

	template<typename _Up, typename _Ep>
	unique_ptr(unique_ptr<_Up, _Ep>&& __u)
	: _M_t(__u.release(), std::forward<_Ep>(__u.get_deleter()))
	{ }

	// Destructor.
	~unique_ptr() { reset(); }

	// Assignment.
	unique_ptr&
	operator=(unique_ptr&& __u)
	{
	reset(__u.release());
	get_deleter() = std::forward<deleter_type>(__u.get_deleter());
	return *this;
	}

	template<typename _Up, typename _Ep>
	unique_ptr&
	operator=(unique_ptr<_Up, _Ep>&& __u)
	{
	reset(__u.release());
	get_deleter() = std::forward<_Ep>(__u.get_deleter());
	return *this;
	}

	unique_ptr&
	operator=(nullptr_t)
	{
	reset();
	return *this;
	}

	// Observers.
	typename std::add_lvalue_reference<element_type>::type
	operator[](size_t __i) const
	{
	_GLIBCXX_DEBUG_ASSERT(get() != pointer());
	return get()[__i];
	}

	pointer
	get() const
	{ return std::get<0>(_M_t); }

	deleter_type&
	get_deleter()
	{ return std::get<1>(_M_t); }

	const deleter_type&
	get_deleter() const
	{ return std::get<1>(_M_t); }

	explicit operator bool() const
	{ return get() == pointer() ? false : true; }

	// Modifiers.
	pointer
	release()
	{
	pointer __p = get();
	std::get<0>(_M_t) = pointer();
	return __p;
	}

	void
	reset(pointer __p = pointer())
	{
	using std::swap;
	swap(std::get<0>(_M_t), __p);
	if (__p != nullptr)
	get_deleter()(__p);
	}

	void
	reset(nullptr_t)
	{
	pointer __p = get();
	std::get<0>(_M_t) = pointer();
	if (__p != nullptr)
	get_deleter()(__p);
	}

	// DR 821.
	template<typename _Up>
	void reset(_Up) = delete;

	void
	swap(unique_ptr& __u)
	{
	using std::swap;
	swap(_M_t, __u._M_t);
	}

	// Disable copy from lvalue.
	unique_ptr(const unique_ptr&) = delete;
	unique_ptr& operator=(const unique_ptr&) = delete;

	// Disable construction from convertible pointer types.
	// (N2315 - 20.6.5.3.1)
	template<typename _Up>
	unique_ptr(_Up*, typename
	std::conditional<std::is_reference<deleter_type>::value,
	deleter_type, const deleter_type&>::type,
	typename std::enable_if<std::is_convertible<_Up*,
	pointer>::value>::type* = 0) = delete;

	template<typename _Up>
	unique_ptr(_Up*, typename std::remove_reference<deleter_type>::type&&,
	typename std::enable_if<std::is_convertible<_Up*,
	pointer>::value>::type* = 0) = delete;

	template<typename _Up>
	explicit
	unique_ptr(_Up, typename std::enable_if<std::is_convertible<_Up,
	pointer>::value>::type* = 0) = delete;
	};

	template<typename _Tp, typename _Dp>
	inline void
	swap(unique_ptr<_Tp, _Dp>& __x,
	unique_ptr<_Tp, _Dp>& __y)
	{ __x.swap(__y); }

	template<typename _Tp, typename _Dp,
	typename _Up, typename _Ep>
	inline bool
	operator==(const unique_ptr<_Tp, _Dp>& __x,
	const unique_ptr<_Up, _Ep>& __y)
	{ return __x.get() == __y.get(); }

	template<typename _Tp, typename _Dp>
	inline bool
	operator==(const unique_ptr<_Tp, _Dp>& __x, nullptr_t)
	{ return __x.get() == nullptr; }

	template<typename _Tp, typename _Dp>
	inline bool
	operator==(nullptr_t, const unique_ptr<_Tp, _Dp>& __y)
	{ return nullptr == __y.get(); }

	template<typename _Tp, typename _Dp,
	typename _Up, typename _Ep>
	inline bool
	operator!=(const unique_ptr<_Tp, _Dp>& __x,
	const unique_ptr<_Up, _Ep>& __y)
	{ return !(__x.get() == __y.get()); }

	template<typename _Tp, typename _Dp>
	inline bool
	operator!=(const unique_ptr<_Tp, _Dp>& __x, nullptr_t)
	{ return __x.get() != nullptr; }

	template<typename _Tp, typename _Dp>
	inline bool
	operator!=(nullptr_t, const unique_ptr<_Tp, _Dp>& __y)
	{ return nullptr != __y.get(); }

	template<typename _Tp, typename _Dp,
	typename _Up, typename _Ep>
	inline bool
	operator<(const unique_ptr<_Tp, _Dp>& __x,
	const unique_ptr<_Up, _Ep>& __y)
	{ return __x.get() < __y.get(); }

	template<typename _Tp, typename _Dp,
	typename _Up, typename _Ep>
	inline bool
	operator<=(const unique_ptr<_Tp, _Dp>& __x,
	const unique_ptr<_Up, _Ep>& __y)
	{ return !(__y.get() < __x.get()); }

	template<typename _Tp, typename _Dp,
	typename _Up, typename _Ep>
	inline bool
	operator>(const unique_ptr<_Tp, _Dp>& __x,
	const unique_ptr<_Up, _Ep>& __y)
	{ return __y.get() < __x.get(); }

	template<typename _Tp, typename _Dp,
	typename _Up, typename _Ep>
	inline bool
	operator>=(const unique_ptr<_Tp, _Dp>& __x,
	const unique_ptr<_Up, _Ep>& __y)
	{ return !(__x.get() < __y.get()); }

	/// std::hash specialization for unique_ptr.
	template<typename _Tp, typename _Dp>
	struct hash<unique_ptr<_Tp, _Dp>>
	: public std::unary_function<unique_ptr<_Tp, _Dp>, size_t>
	{
	size_t
	operator()(const unique_ptr<_Tp, _Dp>& __u) const
	{
	typedef unique_ptr<_Tp, _Dp> _UP;
	return std::hash<typename _UP::pointer>()(__u.get());
	}
	};

	// @} group pointer_abstractions

	_GLIBCXX_END_NAMESPACE_VERSION
	} // namespace

	#endif /* _UNIQUE_PTR_H */