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Editing: unique_ptr.hpp

//////////////////////////////////////////////////////////////////////////////
//
// (C) Copyright Ion Gaztanaga 2014-2014. 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)
//
// See http://www.boost.org/libs/move for documentation.
//
//////////////////////////////////////////////////////////////////////////////

#ifndef BOOST_MOVE_UNIQUE_PTR_HPP_INCLUDED
#define BOOST_MOVE_UNIQUE_PTR_HPP_INCLUDED

#ifndef BOOST_CONFIG_HPP
# include <boost/config.hpp>
#endif
#
#if defined(BOOST_HAS_PRAGMA_ONCE)
# pragma once
#endif

#include <boost/move/detail/config_begin.hpp>
#include <boost/move/detail/workaround.hpp> //forceinline
#include <boost/move/detail/unique_ptr_meta_utils.hpp>
#include <boost/move/default_delete.hpp>
#include <boost/move/utility_core.hpp>
#include <boost/move/adl_move_swap.hpp>
#include <boost/static_assert.hpp>
#include <boost/assert.hpp>

#include <cstddef> //For std::nullptr_t and std::size_t

//!\file
//! Describes the smart pointer unique_ptr, a drop-in replacement for std::unique_ptr,
//! usable also from C++03 compilers.
//!
//! Main differences from std::unique_ptr to avoid heavy dependencies,
//! specially in C++03 compilers:
//! - <tt>operator < </tt> uses pointer <tt>operator < </tt>instead of <tt>std::less<common_type></tt>. 
//! This avoids dependencies on <tt>std::common_type</tt> and <tt>std::less</tt>
//! (<tt><type_traits>/<functional></tt> headers). In C++03 this avoid pulling Boost.Typeof and other
//! cascading dependencies. As in all Boost platforms <tt>operator <</tt> on raw pointers and
//! other smart pointers provides strict weak ordering in practice this should not be a problem for users.
//! - assignable from literal 0 for compilers without nullptr
//! - <tt>unique_ptr<T[]></tt> is constructible and assignable from <tt>unique_ptr<U[]></tt> if
//! cv-less T and cv-less U are the same type and T is more CV qualified than U.

namespace boost{
// @cond
namespace move_upd {

////////////////////////////////////////////
// deleter types
////////////////////////////////////////////
#if defined(BOOST_NO_CXX11_RVALUE_REFERENCES)
template <class T>
class is_noncopyable
{
 typedef char true_t;
 class false_t { char dummy[2]; };
 template<class U> static false_t dispatch(...);
 template<class U> static true_t dispatch(typename U::boost_move_no_copy_constructor_or_assign*);
 public:
 static const bool value = sizeof(dispatch<T>(0)) == sizeof(true_t);
};
#endif //defined(BOOST_NO_CXX11_RVALUE_REFERENCES)

template <class D>
struct deleter_types
{
 typedef typename bmupmu::add_lvalue_reference<D>::type del_ref;
 typedef typename bmupmu::add_const_lvalue_reference<D>::type del_cref;
 #ifndef BOOST_NO_CXX11_RVALUE_REFERENCES
 typedef typename bmupmu::if_c
 < bmupmu::is_lvalue_reference<D>::value, D, del_cref >::type deleter_arg_type1;
 typedef typename bmupmu::remove_reference<D>::type && deleter_arg_type2;
 #else
 typedef typename bmupmu::if_c
 < is_noncopyable<D>::value, bmupmu::nat, del_cref>::type non_ref_deleter_arg1;
 typedef typename bmupmu::if_c< bmupmu::is_lvalue_reference<D>::value
 , D, non_ref_deleter_arg1 >::type deleter_arg_type1;
 typedef ::boost::rv<D> & deleter_arg_type2;
 #endif
};

////////////////////////////////////////////
// unique_ptr_data
////////////////////////////////////////////
template <class P, class D, bool = bmupmu::is_unary_function<D>::value || bmupmu::is_reference<D>::value >
struct unique_ptr_data
{
 typedef typename deleter_types<D>::deleter_arg_type1 deleter_arg_type1;
 typedef typename deleter_types<D>::del_ref del_ref;
 typedef typename deleter_types<D>::del_cref del_cref;

BOOST_MOVE_FORCEINLINE unique_ptr_data() BOOST_NOEXCEPT
      : m_p(), d()
   {}

BOOST_MOVE_FORCEINLINE explicit unique_ptr_data(P p) BOOST_NOEXCEPT
      : m_p(p), d()
   {}

BOOST_MOVE_FORCEINLINE unique_ptr_data(P p, deleter_arg_type1 d1) BOOST_NOEXCEPT
      : m_p(p), d(d1)
   {}

template <class U>
 BOOST_MOVE_FORCEINLINE unique_ptr_data(P p, BOOST_FWD_REF(U) d1) BOOST_NOEXCEPT
 : m_p(p), d(::boost::forward(d1))
 {}

BOOST_MOVE_FORCEINLINE del_ref deleter()       { return d; }
   BOOST_MOVE_FORCEINLINE del_cref deleter() const{ return d; }

P m_p;
   D d;

private:
   unique_ptr_data& operator=(const unique_ptr_data&);
   unique_ptr_data(const unique_ptr_data&);
};

template <class P, class D>
struct unique_ptr_data<P, D, false>
 : private D
{
 typedef typename deleter_types<D>::deleter_arg_type1 deleter_arg_type1;
 typedef typename deleter_types<D>::del_ref del_ref;
 typedef typename deleter_types<D>::del_cref del_cref;

BOOST_MOVE_FORCEINLINE unique_ptr_data() BOOST_NOEXCEPT
      : D(), m_p()
   {}

BOOST_MOVE_FORCEINLINE explicit unique_ptr_data(P p) BOOST_NOEXCEPT
      : D(), m_p(p)
   {}

BOOST_MOVE_FORCEINLINE unique_ptr_data(P p, deleter_arg_type1 d1) BOOST_NOEXCEPT
      : D(d1), m_p(p)
   {}

template <class U>
 BOOST_MOVE_FORCEINLINE unique_ptr_data(P p, BOOST_FWD_REF(U) d) BOOST_NOEXCEPT
 : D(::boost::forward(d)), m_p(p)
 {}

BOOST_MOVE_FORCEINLINE del_ref deleter() BOOST_NOEXCEPT { return static_cast<del_ref>(*this); }
 BOOST_MOVE_FORCEINLINE del_cref deleter() const BOOST_NOEXCEPT { return static_cast<del_cref>(*this); }

P m_p;

private:
   unique_ptr_data& operator=(const unique_ptr_data&);
   unique_ptr_data(const unique_ptr_data&);
};

////////////////////////////////////////////
//          is_unique_ptr_convertible
////////////////////////////////////////////

//Although non-standard, we avoid using pointer_traits
//to avoid heavy dependencies
template <typename T>
struct get_element_type
{
 struct DefaultWrap { typedef bmupmu::natify<T> element_type; };
 template <typename X> static char test(int, typename X::element_type*);
 template <typename X> static int test(...);
 static const bool value = (1 == sizeof(test<T>(0, 0)));
 typedef typename bmupmu::if_c<value, T, DefaultWrap>::type::element_type type;
};

template<class T>
struct get_element_type<T*>
{
 typedef T type;
};

template<class T>
struct get_cvelement
 : bmupmu::remove_cv<typename get_element_type<T>::type>
{};

template <class P1, class P2>
struct is_same_cvelement_and_convertible
{
 typedef typename bmupmu::remove_reference<P1>::type arg1;
 typedef typename bmupmu::remove_reference<P2>::type arg2;
 static const bool same_cvless =
 bmupmu::is_same<typename get_cvelement<arg1>::type,typename get_cvelement<arg2>::type>::value;
 static const bool value = same_cvless && bmupmu::is_convertible<arg1, arg2>::value;
};

template<bool IsArray, class FromPointer, class ThisPointer>
struct is_unique_ptr_convertible
 : is_same_cvelement_and_convertible<FromPointer, ThisPointer>
{};

template<class FromPointer, class ThisPointer>
struct is_unique_ptr_convertible<false, FromPointer, ThisPointer>
 : bmupmu::is_convertible<FromPointer, ThisPointer>
{};

////////////////////////////////////////
////     enable_up_moveconv_assign
////////////////////////////////////////

template<class T, class FromPointer, class ThisPointer, class Type = bmupmu::nat>
struct enable_up_ptr
 : bmupmu::enable_if_c< is_unique_ptr_convertible
 < bmupmu::is_array<T>::value, FromPointer, ThisPointer>::value, Type>
{};

////////////////////////////////////////
////     enable_up_moveconv_assign
////////////////////////////////////////

template<class T, class D, class U, class E>
struct unique_moveconvert_assignable
{
 static const bool t_is_array = bmupmu::is_array<T>::value;
 static const bool value =
 t_is_array == bmupmu::is_array::value &&
 bmupmu::extent<T>::value == bmupmu::extent::value &&
 is_unique_ptr_convertible
 < t_is_array
 , typename bmupmu::pointer_type<U, E>::type, typename bmupmu::pointer_type<T, D>::type
 >::value;
};

template<class T, class D, class U, class E, std::size_t N>
struct unique_moveconvert_assignable<T[], D, U[N], E>
 : unique_moveconvert_assignable<T[], D, U[], E>
{};

template<class T, class D, class U, class E, class Type = bmupmu::nat>
struct enable_up_moveconv_assign
 : bmupmu::enable_if_c<unique_moveconvert_assignable<T, D, U, E>::value, Type>
{};

////////////////////////////////////////
////     enable_up_moveconv_constr
////////////////////////////////////////

template<class D, class E, bool IsReference = bmupmu::is_reference<D>::value>
struct unique_deleter_is_initializable
 : bmupmu::is_same<D, E>
{};

template <class T, class U>
class is_rvalue_convertible
{
 #ifndef BOOST_NO_CXX11_RVALUE_REFERENCES
 typedef typename bmupmu::remove_reference<T>::type&& t_from;
 #else
 typedef typename bmupmu::if_c
 < ::boost::has_move_emulation_enabled<T>::value && !bmupmu::is_reference<T>::value
 , ::boost::rv<T>&
 , typename bmupmu::add_lvalue_reference<T>::type
 >::type t_from;
 #endif

typedef char true_t;
   class false_t { char dummy[2]; };
   static false_t dispatch(...);
   static true_t  dispatch(U);
   static t_from trigger();
   public:
   static const bool value = sizeof(dispatch(trigger())) == sizeof(true_t);
};

template<class D, class E>
struct unique_deleter_is_initializable<D, E, false>
{
 #if !defined(BOOST_NO_CXX11_RVALUE_REFERENCES)
 //Clang has some problems with is_rvalue_convertible with non-copyable types
 //so use intrinsic if available
 #if defined(BOOST_CLANG)
 #if __has_feature(is_convertible_to)
 static const bool value = __is_convertible_to(E, D);
 #else
 static const bool value = is_rvalue_convertible<E, D>::value;
 #endif
 #else
 static const bool value = is_rvalue_convertible<E, D>::value;
 #endif

#else //!defined(BOOST_NO_CXX11_RVALUE_REFERENCES)
 //No hope for compilers with move emulation for now. In several compilers is_convertible
 // leads to errors, so just move the Deleter and see if the conversion works
 static const bool value = true; /*is_rvalue_convertible<E, D>::value*/
 #endif
};

template<class T, class D, class U, class E, class Type = bmupmu::nat>
struct enable_up_moveconv_constr
 : bmupmu::enable_if_c
 < unique_moveconvert_assignable<T, D, U, E>::value && unique_deleter_is_initializable<D, E>::value
 , Type>
{};

}  //namespace move_upd {
// @endcond

namespace movelib {

//! A unique pointer is an object that owns another object and
//! manages that other object through a pointer.
//! 
//! More precisely, a unique pointer is an object u that stores a pointer to a second object p and will dispose
//! of p when u is itself destroyed (e.g., when leaving block scope). In this context, u is said to own p.
//! 
//! The mechanism by which u disposes of p is known as p's associated deleter, a function object whose correct
//! invocation results in p's appropriate disposition (typically its deletion).
//! 
//! Let the notation u.p denote the pointer stored by u, and let u.d denote the associated deleter. Upon request,
//! u can reset (replace) u.p and u.d with another pointer and deleter, but must properly dispose of its owned
//! object via the associated deleter before such replacement is considered completed.
//! 
//! Additionally, u can, upon request, transfer ownership to another unique pointer u2. Upon completion of
//! such a transfer, the following postconditions hold:
//! - u2.p is equal to the pre-transfer u.p,
//! - u.p is equal to nullptr, and
//! - if the pre-transfer u.d maintained state, such state has been transferred to u2.d.
//! 
//! As in the case of a reset, u2 must properly dispose of its pre-transfer owned object via the pre-transfer
//! associated deleter before the ownership transfer is considered complete.
//! 
//! Each object of a type U instantiated from the unique_ptr template specified in this subclause has the strict
//! ownership semantics, specified above, of a unique pointer. In partial satisfaction of these semantics, each
//! such U is MoveConstructible and MoveAssignable, but is not CopyConstructible nor CopyAssignable.
//! The template parameter T of unique_ptr may be an incomplete type.
//! 
//! The uses of unique_ptr include providing exception safety for dynamically allocated memory, passing
//! ownership of dynamically allocated memory to a function, and returning dynamically allocated memory from
//! a function.
//!
//! If T is an array type (e.g. unique_ptr<MyType[]>) the interface is slightly altered:
//! - Pointers to types derived from T are rejected by the constructors, and by reset.
//! - The observers <tt>operator*</tt> and <tt>operator-></tt> are not provided.
//! - The indexing observer <tt>operator[]</tt> is provided.
//!
//! \tparam T Provides the type of the stored pointer.
//! \tparam D The deleter type:
//! - The default type for the template parameter D is default_delete. A client-supplied template argument
//! D shall be a function object type, lvalue-reference to function, or lvalue-reference to function object type
//! for which, given a value d of type D and a value ptr of type unique_ptr<T, D>::pointer, the expression
//! d(ptr) is valid and has the effect of disposing of the pointer as appropriate for that deleter.
//! - If the deleter's type D is not a reference type, D shall satisfy the requirements of Destructible.
//! - If the type <tt>remove_reference<D>::type::pointer</tt> exists, it shall satisfy the requirements of NullablePointer.
template <class T, class D = default_delete<T> >
class unique_ptr
{
 #if defined(BOOST_MOVE_DOXYGEN_INVOKED)
 public:
 unique_ptr(const unique_ptr&) = delete;
 unique_ptr& operator=(const unique_ptr&) = delete;
 private:
 #else
 BOOST_MOVABLE_BUT_NOT_COPYABLE(unique_ptr)

typedef bmupmu::pointer_type<T, D > pointer_type_obtainer;
 typedef bmupd::unique_ptr_data
 <typename pointer_type_obtainer::type, D> data_type;
 typedef typename bmupd::deleter_types<D>::deleter_arg_type1 deleter_arg_type1;
 typedef typename bmupd::deleter_types<D>::deleter_arg_type2 deleter_arg_type2;
 data_type m_data;
 #endif

public:
 //! If the type <tt>remove_reference<D>::type::pointer</tt> exists, then it shall be a
 //! synonym for <tt>remove_reference<D>::type::pointer</tt>. Otherwise it shall be a
 //! synonym for T*.
 typedef typename BOOST_MOVE_SEEDOC(pointer_type_obtainer::type) pointer;
 //! If T is an array type, then element_type is equal to T. Otherwise, if T is a type
 //! in the form U[], element_type is equal to U.
 typedef typename BOOST_MOVE_SEEDOC(bmupmu::remove_extent<T>::type) element_type;
 typedef D deleter_type;

//! Effects: Same as <tt>unique_ptr()</tt> (default constructor).
 //! 
 BOOST_MOVE_FORCEINLINE BOOST_CONSTEXPR unique_ptr(BOOST_MOVE_DOC0PTR(bmupd::nullptr_type)) BOOST_NOEXCEPT
 : m_data()
 {
 //If this constructor is instantiated with a pointer type or reference type
 //for the template argument D, the program is ill-formed.
 BOOST_STATIC_ASSERT(!bmupmu::is_pointer<D>::value);
 BOOST_STATIC_ASSERT(!bmupmu::is_reference<D>::value);
 }

//! Requires: D shall satisfy the requirements of DefaultConstructible, and
 //! that construction shall not throw an exception.
 //!
 //! Effects: Constructs a unique_ptr which owns p, initializing the stored pointer 
 //! with p and value initializing the stored deleter.
 //!
 //! Postconditions: <tt>get() == p</tt>. <tt>get_deleter()</tt> returns a reference to the stored deleter.
 //!
 //! Remarks: If this constructor is instantiated with a pointer type or reference type
 //! for the template argument D, the program is ill-formed.
 //! This constructor shall not participate in overload resolution unless:
 //! - If T is not an array type and Pointer is implicitly convertible to pointer.
 //! - If T is an array type and Pointer is a more CV qualified pointer to element_type.
 template<class Pointer>
 BOOST_MOVE_FORCEINLINE explicit unique_ptr(Pointer p
 BOOST_MOVE_DOCIGN(BOOST_MOVE_I typename bmupd::enable_up_ptr<T BOOST_MOVE_I Pointer BOOST_MOVE_I pointer>::type* =0)
 ) BOOST_NOEXCEPT
 : m_data(p)
 {
 //If T is not an array type, element_type_t<Pointer> derives from T
 //it uses the default deleter and T has no virtual destructor, then you have a problem
 BOOST_STATIC_ASSERT(( !::boost::move_upmu::missing_virtual_destructor
 <D, typename bmupd::get_element_type<Pointer>::type>::value ));
 //If this constructor is instantiated with a pointer type or reference type
 //for the template argument D, the program is ill-formed.
 BOOST_STATIC_ASSERT(!bmupmu::is_pointer<D>::value);
 BOOST_STATIC_ASSERT(!bmupmu::is_reference<D>::value);
 }

//!The signature of this constructor depends upon whether D is a reference type.
 //! - If D is non-reference type A, then the signature is <tt>unique_ptr(pointer p, const A& d)</tt>.
 //! - If D is an lvalue-reference type A&, then the signature is <tt>unique_ptr(pointer p, A& d)</tt>.
 //! - If D is an lvalue-reference type const A&, then the signature is <tt>unique_ptr(pointer p, const A& d)</tt>.
 //!
 //!
 //! Requires: Either
 //! - D is not an lvalue-reference type and d is an lvalue or const rvalue. 
 //! D shall satisfy the requirements of CopyConstructible, and the copy constructor of D
 //! shall not throw an exception. This unique_ptr will hold a copy of d.
 //! - D is an lvalue-reference type and d is an lvalue. the type which D references need not be CopyConstructible nor
 //! MoveConstructible. This unique_ptr will hold a D which refers to the lvalue d.
 //!
 //! Effects: Constructs a unique_ptr object which owns p, initializing the stored pointer with p and
 //! initializing the deleter as described above.
 //! 
 //! Postconditions: <tt>get() == p</tt>. <tt>get_deleter()</tt> returns a reference to the stored deleter. If D is a
 //! reference type then <tt>get_deleter()</tt> returns a reference to the lvalue d.
 //!
 //! Remarks: This constructor shall not participate in overload resolution unless:
 //! - If T is not an array type and Pointer is implicitly convertible to pointer.
 //! - If T is an array type and Pointer is a more CV qualified pointer to element_type.
 template<class Pointer>
 BOOST_MOVE_FORCEINLINE unique_ptr(Pointer p, BOOST_MOVE_SEEDOC(deleter_arg_type1) d1
 BOOST_MOVE_DOCIGN(BOOST_MOVE_I typename bmupd::enable_up_ptr<T BOOST_MOVE_I Pointer BOOST_MOVE_I pointer>::type* =0)
 ) BOOST_NOEXCEPT
 : m_data(p, d1)
 {
 //If T is not an array type, element_type_t<Pointer> derives from T
 //it uses the default deleter and T has no virtual destructor, then you have a problem
 BOOST_STATIC_ASSERT(( !::boost::move_upmu::missing_virtual_destructor
 <D, typename bmupd::get_element_type<Pointer>::type>::value ));
 }

//! Effects: Same effects as <tt>template<class Pointer> unique_ptr(Pointer p, deleter_arg_type1 d1)</tt>
 //! and additionally <tt>get() == nullptr</tt>
 BOOST_MOVE_FORCEINLINE unique_ptr(BOOST_MOVE_DOC0PTR(bmupd::nullptr_type), BOOST_MOVE_SEEDOC(deleter_arg_type1) d1) BOOST_NOEXCEPT
 : m_data(pointer(), d1)
 {}

//! The signature of this constructor depends upon whether D is a reference type.
 //! - If D is non-reference type A, then the signature is <tt>unique_ptr(pointer p, A&& d)</tt>.
 //! - If D is an lvalue-reference type A&, then the signature is <tt>unique_ptr(pointer p, A&& d)</tt>.
 //! - If D is an lvalue-reference type const A&, then the signature is <tt>unique_ptr(pointer p, const A&& d)</tt>.
 //!
 //! Requires: Either
 //! - D is not an lvalue-reference type and d is a non-const rvalue. D
 //! shall satisfy the requirements of MoveConstructible, and the move constructor
 //! of D shall not throw an exception. This unique_ptr will hold a value move constructed from d.
 //! - D is an lvalue-reference type and d is an rvalue, the program is ill-formed.
 //!
 //! Effects: Constructs a unique_ptr object which owns p, initializing the stored pointer with p and
 //! initializing the deleter as described above.
 //! 
 //! Postconditions: <tt>get() == p</tt>. <tt>get_deleter()</tt> returns a reference to the stored deleter. If D is a
 //! reference type then <tt>get_deleter()</tt> returns a reference to the lvalue d.
 //!
 //! Remarks: This constructor shall not participate in overload resolution unless:
 //! - If T is not an array type and Pointer is implicitly convertible to pointer.
 //! - If T is an array type and Pointer is a more CV qualified pointer to element_type.
 template<class Pointer>
 BOOST_MOVE_FORCEINLINE unique_ptr(Pointer p, BOOST_MOVE_SEEDOC(deleter_arg_type2) d2
 BOOST_MOVE_DOCIGN(BOOST_MOVE_I typename bmupd::enable_up_ptr<T BOOST_MOVE_I Pointer BOOST_MOVE_I pointer>::type* =0)
 ) BOOST_NOEXCEPT
 : m_data(p, ::boost::move(d2))
 {
 //If T is not an array type, element_type_t<Pointer> derives from T
 //it uses the default deleter and T has no virtual destructor, then you have a problem
 BOOST_STATIC_ASSERT(( !::boost::move_upmu::missing_virtual_destructor
 <D, typename bmupd::get_element_type<Pointer>::type>::value ));
 }

//! Effects: Same effects as <tt>template<class Pointer> unique_ptr(Pointer p, deleter_arg_type2 d2)</tt>
 //! and additionally <tt>get() == nullptr</tt>
 BOOST_MOVE_FORCEINLINE unique_ptr(BOOST_MOVE_DOC0PTR(bmupd::nullptr_type), BOOST_MOVE_SEEDOC(deleter_arg_type2) d2) BOOST_NOEXCEPT
 : m_data(pointer(), ::boost::move(d2))
 {}

//! Requires: If D is not a reference type, D shall satisfy the requirements of MoveConstructible.
 //! Construction of the deleter from an rvalue of type D shall not throw an exception.
 //! 
 //! Effects: Constructs a unique_ptr by transferring ownership from u to *this. If D is a reference type,
 //! this deleter is copy constructed from u's deleter; otherwise, this deleter is move constructed from u's
 //! deleter.
 //! 
 //! Postconditions: <tt>get()</tt> yields the value u.get() yielded before the construction. <tt>get_deleter()</tt>
 //! returns a reference to the stored deleter that was constructed from u.get_deleter(). If D is a
 //! reference type then <tt>get_deleter()</tt> and <tt>u.get_deleter()</tt> both reference the same lvalue deleter.
 BOOST_MOVE_FORCEINLINE unique_ptr(BOOST_RV_REF(unique_ptr) u) BOOST_NOEXCEPT
 : m_data(u.release(), ::boost::move_if_not_lvalue_reference<D>(u.get_deleter()))
 {}

//! Requires: If E is not a reference type, construction of the deleter from an rvalue of type E shall be
 //! well formed and shall not throw an exception. Otherwise, E is a reference type and construction of the
 //! deleter from an lvalue of type E shall be well formed and shall not throw an exception.
 //!
 //! Remarks: This constructor shall not participate in overload resolution unless:
 //! - <tt>unique_ptr<U, E>::pointer</tt> is implicitly convertible to pointer,
 //! - U is not an array type, and
 //! - either D is a reference type and E is the same type as D, or D is not a reference type and E is
 //! implicitly convertible to D.
 //!
 //! Effects: Constructs a unique_ptr by transferring ownership from u to *this. If E is a reference type,
 //! this deleter is copy constructed from u's deleter; otherwise, this deleter is move constructed from u's deleter.
 //!
 //! Postconditions: <tt>get()</tt> yields the value <tt>u.get()</tt> yielded before the construction. <tt>get_deleter()</tt>
 //! returns a reference to the stored deleter that was constructed from <tt>u.get_deleter()</tt>.
 template <class U, class E>
 BOOST_MOVE_FORCEINLINE unique_ptr( BOOST_RV_REF_BEG_IF_CXX11 unique_ptr<U, E> BOOST_RV_REF_END_IF_CXX11 u
 BOOST_MOVE_DOCIGN(BOOST_MOVE_I typename bmupd::enable_up_moveconv_constr<T BOOST_MOVE_I D BOOST_MOVE_I U BOOST_MOVE_I E>::type* =0)
 ) BOOST_NOEXCEPT
 : m_data(u.release(), ::boost::move_if_not_lvalue_reference<E>(u.get_deleter()))
 {
 //If T is not an array type, U derives from T
 //it uses the default deleter and T has no virtual destructor, then you have a problem
 BOOST_STATIC_ASSERT(( !::boost::move_upmu::missing_virtual_destructor
 <D, typename unique_ptr<U, E>::pointer>::value ));
 }

//! Requires: The expression <tt>get_deleter()(get())</tt> shall be well formed, shall have well-defined behavior,
 //! and shall not throw exceptions.
 //!
 //! Effects: If <tt>get() == nullpt1r</tt> there are no effects. Otherwise <tt>get_deleter()(get())</tt>.
 //!
 //! Note: The use of default_delete requires T to be a complete type
 ~unique_ptr()
 { if(m_data.m_p) m_data.deleter()(m_data.m_p); }

//! Requires: If D is not a reference type, D shall satisfy the requirements of MoveAssignable
 //! and assignment of the deleter from an rvalue of type D shall not throw an exception. Otherwise, D
 //! is a reference type; <tt>remove_reference<D>::type</tt> shall satisfy the CopyAssignable requirements and
 //! assignment of the deleter from an lvalue of type D shall not throw an exception.
 //!
 //! Effects: Transfers ownership from u to *this as if by calling <tt>reset(u.release())</tt> followed
 //! by <tt>get_deleter() = std::forward<D>(u.get_deleter())</tt>.
 //!
 //! Returns: *this.
 unique_ptr& operator=(BOOST_RV_REF(unique_ptr) u) BOOST_NOEXCEPT
 {
 this->reset(u.release());
 m_data.deleter() = ::boost::move_if_not_lvalue_reference<D>(u.get_deleter());
 return *this;
 }

//! Requires: If E is not a reference type, assignment of the deleter from an rvalue of type E shall be
 //! well-formed and shall not throw an exception. Otherwise, E is a reference type and assignment of the
 //! deleter from an lvalue of type E shall be well-formed and shall not throw an exception.
 //!
 //! Remarks: This operator shall not participate in overload resolution unless:
 //! - <tt>unique_ptr<U, E>::pointer</tt> is implicitly convertible to pointer and
 //! - U is not an array type.
 //!
 //! Effects: Transfers ownership from u to *this as if by calling <tt>reset(u.release())</tt> followed by
 //! <tt>get_deleter() = std::forward<E>(u.get_deleter())</tt>.
 //!
 //! Returns: *this.
 template <class U, class E>
 BOOST_MOVE_DOC1ST(unique_ptr&, typename bmupd::enable_up_moveconv_assign
 <T BOOST_MOVE_I D BOOST_MOVE_I U BOOST_MOVE_I E BOOST_MOVE_I unique_ptr &>::type)
 operator=(BOOST_RV_REF_BEG unique_ptr<U, E> BOOST_RV_REF_END u) BOOST_NOEXCEPT
 {
 this->reset(u.release());
 m_data.deleter() = ::boost::move_if_not_lvalue_reference<E>(u.get_deleter());
 return *this;
 }

//! Effects: <tt>reset()</tt>.
 //!
 //! Postcondition: <tt>get() == nullptr</tt>
 //!
 //! Returns: *this.
 unique_ptr& operator=(BOOST_MOVE_DOC0PTR(bmupd::nullptr_type)) BOOST_NOEXCEPT
 { this->reset(); return *this; }

//! Requires: <tt>get() != nullptr</tt>.
 //!
 //! Returns: <tt>*get()</tt>.
 //!
 //! Remarks</b: If T is an array type, the program is ill-formed.
 BOOST_MOVE_DOC1ST(element_type&, typename bmupmu::add_lvalue_reference<element_type>::type)
 operator*() const BOOST_NOEXCEPT
 {
 BOOST_STATIC_ASSERT((!bmupmu::is_array<T>::value));
 return *m_data.m_p;
 }

//! Requires: i < the number of elements in the array to which the stored pointer points.
 //!
 //! Returns: <tt>get()[i]</tt>.
 //!
 //! Remarks</b: If T is not an array type, the program is ill-formed.
 BOOST_MOVE_FORCEINLINE BOOST_MOVE_DOC1ST(element_type&, typename bmupmu::add_lvalue_reference<element_type>::type)
 operator[](std::size_t i) const BOOST_NOEXCEPT
 {
 BOOST_ASSERT( bmupmu::extent<T>::value == 0 || i < bmupmu::extent<T>::value );
 BOOST_ASSERT(m_data.m_p);
 return m_data.m_p[i];
 }

//! Requires: <tt>get() != nullptr</tt>.
 //!
 //! Returns: <tt>get()</tt>.
 //!
 //! Note: use typically requires that T be a complete type.
 //!
 //! Remarks</b: If T is an array type, the program is ill-formed.
 BOOST_MOVE_FORCEINLINE pointer operator->() const BOOST_NOEXCEPT
 {
 BOOST_STATIC_ASSERT((!bmupmu::is_array<T>::value));
 BOOST_ASSERT(m_data.m_p);
 return m_data.m_p;
 }

//! Returns: The stored pointer.
 //!
 BOOST_MOVE_FORCEINLINE pointer get() const BOOST_NOEXCEPT
 { return m_data.m_p; }

//! Returns: A reference to the stored deleter.
 //!
 BOOST_MOVE_FORCEINLINE BOOST_MOVE_DOC1ST(D&, typename bmupmu::add_lvalue_reference<D>::type)
 get_deleter() BOOST_NOEXCEPT
 { return m_data.deleter(); }

//! Returns: A reference to the stored deleter.
 //!
 BOOST_MOVE_FORCEINLINE BOOST_MOVE_DOC1ST(const D&, typename bmupmu::add_const_lvalue_reference<D>::type)
 get_deleter() const BOOST_NOEXCEPT
 { return m_data.deleter(); }

#ifdef BOOST_MOVE_DOXYGEN_INVOKED
 //! Returns: Returns: get() != nullptr.
 //!
 BOOST_MOVE_FORCEINLINE explicit operator bool
 #else
 BOOST_MOVE_FORCEINLINE operator bmupd::explicit_bool_arg
 #endif
 ()const BOOST_NOEXCEPT
 {
 return m_data.m_p
 ? &bmupd::bool_conversion::for_bool
 : bmupd::explicit_bool_arg(0);
 }

//! Postcondition: <tt>get() == nullptr</tt>.
 //!
 //! Returns: The value <tt>get()</tt> had at the start of the call to release. 
 BOOST_MOVE_FORCEINLINE pointer release() BOOST_NOEXCEPT
 {
 const pointer tmp = m_data.m_p;
 m_data.m_p = pointer();
 return tmp;
 }

//! Requires: The expression <tt>get_deleter()(get())</tt> shall be well formed, shall have well-defined behavior,
 //! and shall not throw exceptions.
 //!
 //! Effects: assigns p to the stored pointer, and then if the old value of the stored pointer, old_p, was not
 //! equal to nullptr, calls <tt>get_deleter()(old_p)</tt>. Note: The order of these operations is significant
 //! because the call to <tt>get_deleter()</tt> may destroy *this.
 //!
 //! Postconditions: <tt>get() == p</tt>. Note: The postcondition does not hold if the call to <tt>get_deleter()</tt>
 //! destroys *this since <tt>this->get()</tt> is no longer a valid expression.
 //!
 //! Remarks: This constructor shall not participate in overload resolution unless:
 //! - If T is not an array type and Pointer is implicitly convertible to pointer.
 //! - If T is an array type and Pointer is a more CV qualified pointer to element_type.
 template<class Pointer>
 BOOST_MOVE_DOC1ST(void, typename bmupd::enable_up_ptr<T BOOST_MOVE_I Pointer BOOST_MOVE_I pointer BOOST_MOVE_I void>::type)
 reset(Pointer p) BOOST_NOEXCEPT
 {
 //If T is not an array type, element_type_t<Pointer> derives from T
 //it uses the default deleter and T has no virtual destructor, then you have a problem
 BOOST_STATIC_ASSERT(( !::boost::move_upmu::missing_virtual_destructor
 <D, typename bmupd::get_element_type<Pointer>::type>::value ));
 pointer tmp = m_data.m_p;
 m_data.m_p = p;
 if(tmp) m_data.deleter()(tmp);
 }

//! Effects: Same as <tt>reset()</tt>
 //! 
 void reset(BOOST_MOVE_DOC0PTR(bmupd::nullptr_type)) BOOST_NOEXCEPT
 { this->reset(); }

//! Requires: <tt>get_deleter()</tt> shall be swappable and shall not throw an exception under swap.
 //!
 //! Effects: Invokes swap on the stored pointers and on the stored deleters of *this and u.
 void swap(unique_ptr& u) BOOST_NOEXCEPT
 {
 ::boost::adl_move_swap(m_data.m_p, u.m_data.m_p);
 ::boost::adl_move_swap(m_data.deleter(), u.m_data.deleter());
 }
};

//! Effects: Calls <tt>x.swap(y)</tt>.
//!
template <class T, class D>
BOOST_MOVE_FORCEINLINE void swap(unique_ptr<T, D> &x, unique_ptr<T, D> &y) BOOST_NOEXCEPT
{ x.swap(y); }

//! Returns: <tt>x.get() == y.get()</tt>.
//!
template <class T1, class D1, class T2, class D2>
BOOST_MOVE_FORCEINLINE bool operator==(const unique_ptr<T1, D1> &x, const unique_ptr<T2, D2> &y)
{ return x.get() == y.get(); }

//! Returns: <tt>x.get() != y.get()</tt>.
//!
template <class T1, class D1, class T2, class D2>
BOOST_MOVE_FORCEINLINE bool operator!=(const unique_ptr<T1, D1> &x, const unique_ptr<T2, D2> &y)
{ return x.get() != y.get(); }

//! Returns: x.get() < y.get().
//!
//! Remarks: This comparison shall induce a
//! strict weak ordering betwen pointers.
template <class T1, class D1, class T2, class D2>
BOOST_MOVE_FORCEINLINE bool operator<(const unique_ptr<T1, D1> &x, const unique_ptr<T2, D2> &y)
{ return x.get() < y.get(); }

//! Returns: !(y < x).
//!
template <class T1, class D1, class T2, class D2>
BOOST_MOVE_FORCEINLINE bool operator<=(const unique_ptr<T1, D1> &x, const unique_ptr<T2, D2> &y)
{ return !(y < x); }

//! Returns: y < x.
//!
template <class T1, class D1, class T2, class D2>
BOOST_MOVE_FORCEINLINE bool operator>(const unique_ptr<T1, D1> &x, const unique_ptr<T2, D2> &y)
{ return y < x; }

//! Returns:!(x < y).
//!
template <class T1, class D1, class T2, class D2>
BOOST_MOVE_FORCEINLINE bool operator>=(const unique_ptr<T1, D1> &x, const unique_ptr<T2, D2> &y)
{ return !(x < y); }

//! Returns:!x.
//!
template <class T, class D>
BOOST_MOVE_FORCEINLINE bool operator==(const unique_ptr<T, D> &x, BOOST_MOVE_DOC0PTR(bmupd::nullptr_type)) BOOST_NOEXCEPT
{ return !x; }

//! Returns:!x.
//!
template <class T, class D>
BOOST_MOVE_FORCEINLINE bool operator==(BOOST_MOVE_DOC0PTR(bmupd::nullptr_type), const unique_ptr<T, D> &x) BOOST_NOEXCEPT
{ return !x; }

//! Returns: (bool)x.
//!
template <class T, class D>
BOOST_MOVE_FORCEINLINE bool operator!=(const unique_ptr<T, D> &x, BOOST_MOVE_DOC0PTR(bmupd::nullptr_type)) BOOST_NOEXCEPT
{ return !!x; }

//! Returns: (bool)x.
//!
template <class T, class D>
BOOST_MOVE_FORCEINLINE bool operator!=(BOOST_MOVE_DOC0PTR(bmupd::nullptr_type), const unique_ptr<T, D> &x) BOOST_NOEXCEPT
{ return !!x; }

//! Requires: <tt>operator </tt> shall induce a strict weak ordering on unique_ptr<T, D>::pointer values.
//!
//! Returns: Returns <tt>x.get() < pointer()</tt>.
template <class T, class D>
BOOST_MOVE_FORCEINLINE bool operator<(const unique_ptr<T, D> &x, BOOST_MOVE_DOC0PTR(bmupd::nullptr_type))
{ return x.get() < typename unique_ptr<T, D>::pointer(); }

//! Requires: <tt>operator </tt> shall induce a strict weak ordering on unique_ptr<T, D>::pointer values.
//!
//! Returns: Returns <tt>pointer() < x.get()</tt>.
template <class T, class D>
BOOST_MOVE_FORCEINLINE bool operator<(BOOST_MOVE_DOC0PTR(bmupd::nullptr_type), const unique_ptr<T, D> &x)
{ return typename unique_ptr<T, D>::pointer() < x.get(); }

//! Returns: <tt>nullptr < x</tt>.
//!
template <class T, class D>
BOOST_MOVE_FORCEINLINE bool operator>(const unique_ptr<T, D> &x, BOOST_MOVE_DOC0PTR(bmupd::nullptr_type))
{ return x.get() > typename unique_ptr<T, D>::pointer(); }

//! Returns: <tt>x < nullptr</tt>.
//!
template <class T, class D>
BOOST_MOVE_FORCEINLINE bool operator>(BOOST_MOVE_DOC0PTR(bmupd::nullptr_type), const unique_ptr<T, D> &x)
{ return typename unique_ptr<T, D>::pointer() > x.get(); }

//! Returns: <tt>!(nullptr < x)</tt>.
//!
template <class T, class D>
BOOST_MOVE_FORCEINLINE bool operator<=(const unique_ptr<T, D> &x, BOOST_MOVE_DOC0PTR(bmupd::nullptr_type))
{ return !(bmupd::nullptr_type() < x); }

//! Returns: <tt>!(x < nullptr)</tt>.
//!
template <class T, class D>
BOOST_MOVE_FORCEINLINE bool operator<=(BOOST_MOVE_DOC0PTR(bmupd::nullptr_type), const unique_ptr<T, D> &x)
{ return !(x < bmupd::nullptr_type()); }

//! Returns: <tt>!(x < nullptr)</tt>.
//!
template <class T, class D>
BOOST_MOVE_FORCEINLINE bool operator>=(const unique_ptr<T, D> &x, BOOST_MOVE_DOC0PTR(bmupd::nullptr_type))
{ return !(x < bmupd::nullptr_type()); }

//! Returns: <tt>!(nullptr < x)</tt>.
//!
template <class T, class D>
BOOST_MOVE_FORCEINLINE bool operator>=(BOOST_MOVE_DOC0PTR(bmupd::nullptr_type), const unique_ptr<T, D> &x)
{ return !(bmupd::nullptr_type() < x); }

}  //namespace movelib {
}  //namespace boost{

#include <boost/move/detail/config_end.hpp>

#endif   //#ifndef BOOST_MOVE_UNIQUE_PTR_HPP_INCLUDED

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