1//////////////////////////////////////////////////////////////////////////////
2//
3// (C) Copyright Ion Gaztanaga 2014-2014. Distributed under the Boost
4// Software License, Version 1.0. (See accompanying file
5// LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
6//
7// See http://www.boost.org/libs/move for documentation.
8//
9//////////////////////////////////////////////////////////////////////////////
10
11#ifndef BOOST_MOVE_UNIQUE_PTR_HPP_INCLUDED
12#define BOOST_MOVE_UNIQUE_PTR_HPP_INCLUDED
13
14#ifndef BOOST_CONFIG_HPP
15# include <boost/config.hpp>
16#endif
17#
18#if defined(BOOST_HAS_PRAGMA_ONCE)
19# pragma once
20#endif
21
22#include <boost/move/detail/config_begin.hpp>
23#include <boost/move/detail/workaround.hpp>
24#include <boost/move/detail/unique_ptr_meta_utils.hpp>
25#include <boost/move/default_delete.hpp>
26#include <boost/move/utility_core.hpp>
27#include <boost/move/adl_move_swap.hpp>
28#include <boost/static_assert.hpp>
29#include <boost/assert.hpp>
30
31#include <cstddef> //For std::nullptr_t and std::size_t
32
33//!\file
34//! Describes the smart pointer unique_ptr, a drop-in replacement for std::unique_ptr,
35//! usable also from C++03 compilers.
36//!
37//! Main differences from std::unique_ptr to avoid heavy dependencies,
38//! specially in C++03 compilers:
39//! - <tt>operator < </tt> uses pointer <tt>operator < </tt>instead of <tt>std::less<common_type></tt>.
40//! This avoids dependencies on <tt>std::common_type</tt> and <tt>std::less</tt>
41//! (<tt><type_traits>/<functional></tt> headers). In C++03 this avoid pulling Boost.Typeof and other
42//! cascading dependencies. As in all Boost platforms <tt>operator <</tt> on raw pointers and
43//! other smart pointers provides strict weak ordering in practice this should not be a problem for users.
44//! - assignable from literal 0 for compilers without nullptr
45//! - <tt>unique_ptr<T[]></tt> is constructible and assignable from <tt>unique_ptr<U[]></tt> if
46//! cv-less T and cv-less U are the same type and T is more CV qualified than U.
47
48namespace boost{
49// @cond
50namespace move_upd {
51
52////////////////////////////////////////////
53// deleter types
54////////////////////////////////////////////
55#if defined(BOOST_NO_CXX11_RVALUE_REFERENCES)
56template <class T>
57class is_noncopyable
58{
59 typedef char true_t;
60 class false_t { char dummy[2]; };
61 template<class U> static false_t dispatch(...);
62 template<class U> static true_t dispatch(typename U::boost_move_no_copy_constructor_or_assign*);
63 public:
64 static const bool value = sizeof(dispatch<T>(0)) == sizeof(true_t);
65};
66#endif //defined(BOOST_NO_CXX11_RVALUE_REFERENCES)
67
68template <class D>
69struct deleter_types
70{
71 typedef typename bmupmu::add_lvalue_reference<D>::type del_ref;
72 typedef typename bmupmu::add_const_lvalue_reference<D>::type del_cref;
73 #ifndef BOOST_NO_CXX11_RVALUE_REFERENCES
74 typedef typename bmupmu::if_c
75 < bmupmu::is_lvalue_reference<D>::value, D, del_cref >::type deleter_arg_type1;
76 typedef typename bmupmu::remove_reference<D>::type && deleter_arg_type2;
77 #else
78 typedef typename bmupmu::if_c
79 < is_noncopyable<D>::value, bmupmu::nat, del_cref>::type non_ref_deleter_arg1;
80 typedef typename bmupmu::if_c< bmupmu::is_lvalue_reference<D>::value
81 , D, non_ref_deleter_arg1 >::type deleter_arg_type1;
82 typedef ::boost::rv<D> & deleter_arg_type2;
83 #endif
84};
85
86////////////////////////////////////////////
87// unique_ptr_data
88////////////////////////////////////////////
89template <class P, class D, bool = bmupmu::is_unary_function<D>::value || bmupmu::is_reference<D>::value >
90struct unique_ptr_data
91{
92 typedef typename deleter_types<D>::deleter_arg_type1 deleter_arg_type1;
93 typedef typename deleter_types<D>::del_ref del_ref;
94 typedef typename deleter_types<D>::del_cref del_cref;
95
96 unique_ptr_data() BOOST_NOEXCEPT
97 : m_p(), d()
98 {}
99
100 explicit unique_ptr_data(P p) BOOST_NOEXCEPT
101 : m_p(p), d()
102 {}
103
104 unique_ptr_data(P p, deleter_arg_type1 d1) BOOST_NOEXCEPT
105 : m_p(p), d(d1)
106 {}
107
108 template <class U>
109 unique_ptr_data(P p, BOOST_FWD_REF(U) d1) BOOST_NOEXCEPT
110 : m_p(p), d(::boost::forward<U>(d1))
111 {}
112
113 del_ref deleter() { return d; }
114 del_cref deleter() const{ return d; }
115
116 P m_p;
117 D d;
118
119 private:
120 unique_ptr_data& operator=(const unique_ptr_data&);
121 unique_ptr_data(const unique_ptr_data&);
122};
123
124template <class P, class D>
125struct unique_ptr_data<P, D, false>
126 : private D
127{
128 typedef typename deleter_types<D>::deleter_arg_type1 deleter_arg_type1;
129 typedef typename deleter_types<D>::del_ref del_ref;
130 typedef typename deleter_types<D>::del_cref del_cref;
131
132 unique_ptr_data() BOOST_NOEXCEPT
133 : D(), m_p()
134 {}
135
136 explicit unique_ptr_data(P p) BOOST_NOEXCEPT
137 : D(), m_p(p)
138 {}
139
140 unique_ptr_data(P p, deleter_arg_type1 d1) BOOST_NOEXCEPT
141 : D(d1), m_p(p)
142 {}
143
144 template <class U>
145 unique_ptr_data(P p, BOOST_FWD_REF(U) d) BOOST_NOEXCEPT
146 : D(::boost::forward<U>(d)), m_p(p)
147 {}
148
149 del_ref deleter() BOOST_NOEXCEPT { return static_cast<del_ref>(*this); }
150 del_cref deleter() const BOOST_NOEXCEPT { return static_cast<del_cref>(*this); }
151
152 P m_p;
153
154 private:
155 unique_ptr_data& operator=(const unique_ptr_data&);
156 unique_ptr_data(const unique_ptr_data&);
157};
158
159////////////////////////////////////////////
160// is_unique_ptr_convertible
161////////////////////////////////////////////
162
163//Although non-standard, we avoid using pointer_traits
164//to avoid heavy dependencies
165template <typename T>
166struct get_element_type
167{
168 struct DefaultWrap { typedef bmupmu::natify<T> element_type; };
169 template <typename X> static char test(int, typename X::element_type*);
170 template <typename X> static int test(...);
171 static const bool value = (1 == sizeof(test<T>(0, 0)));
172 typedef typename bmupmu::if_c<value, T, DefaultWrap>::type::element_type type;
173};
174
175template<class T>
176struct get_element_type<T*>
177{
178 typedef T type;
179};
180
181template<class T>
182struct get_cvelement
183 : bmupmu::remove_cv<typename get_element_type<T>::type>
184{};
185
186template <class P1, class P2>
187struct is_same_cvelement_and_convertible
188{
189 typedef typename bmupmu::remove_reference<P1>::type arg1;
190 typedef typename bmupmu::remove_reference<P2>::type arg2;
191 static const bool same_cvless =
192 bmupmu::is_same<typename get_cvelement<arg1>::type,typename get_cvelement<arg2>::type>::value;
193 static const bool value = same_cvless && bmupmu::is_convertible<arg1, arg2>::value;
194};
195
196template<bool IsArray, class FromPointer, class ThisPointer>
197struct is_unique_ptr_convertible
198 : is_same_cvelement_and_convertible<FromPointer, ThisPointer>
199{};
200
201template<class FromPointer, class ThisPointer>
202struct is_unique_ptr_convertible<false, FromPointer, ThisPointer>
203 : bmupmu::is_convertible<FromPointer, ThisPointer>
204{};
205
206////////////////////////////////////////
207//// enable_up_moveconv_assign
208////////////////////////////////////////
209
210template<class T, class FromPointer, class ThisPointer, class Type = bmupmu::nat>
211struct enable_up_ptr
212 : bmupmu::enable_if_c< is_unique_ptr_convertible
213 < bmupmu::is_array<T>::value, FromPointer, ThisPointer>::value, Type>
214{};
215
216////////////////////////////////////////
217//// enable_up_moveconv_assign
218////////////////////////////////////////
219
220template<class T, class D, class U, class E>
221struct unique_moveconvert_assignable
222{
223 static const bool t_is_array = bmupmu::is_array<T>::value;
224 static const bool value =
225 t_is_array == bmupmu::is_array<U>::value &&
226 bmupmu::extent<T>::value == bmupmu::extent<U>::value &&
227 is_unique_ptr_convertible
228 < t_is_array
229 , typename bmupmu::pointer_type<U, E>::type, typename bmupmu::pointer_type<T, D>::type
230 >::value;
231};
232
233template<class T, class D, class U, class E, std::size_t N>
234struct unique_moveconvert_assignable<T[], D, U[N], E>
235 : unique_moveconvert_assignable<T[], D, U[], E>
236{};
237
238template<class T, class D, class U, class E, class Type = bmupmu::nat>
239struct enable_up_moveconv_assign
240 : bmupmu::enable_if_c<unique_moveconvert_assignable<T, D, U, E>::value, Type>
241{};
242
243////////////////////////////////////////
244//// enable_up_moveconv_constr
245////////////////////////////////////////
246
247template<class D, class E, bool IsReference = bmupmu::is_reference<D>::value>
248struct unique_deleter_is_initializable
249 : bmupmu::is_same<D, E>
250{};
251
252template <class T, class U>
253class is_rvalue_convertible
254{
255 #ifndef BOOST_NO_CXX11_RVALUE_REFERENCES
256 typedef typename bmupmu::remove_reference<T>::type&& t_from;
257 #else
258 typedef typename bmupmu::if_c
259 < ::boost::has_move_emulation_enabled<T>::value && !bmupmu::is_reference<T>::value
260 , ::boost::rv<T>&
261 , typename bmupmu::add_lvalue_reference<T>::type
262 >::type t_from;
263 #endif
264
265 typedef char true_t;
266 class false_t { char dummy[2]; };
267 static false_t dispatch(...);
268 static true_t dispatch(U);
269 static t_from trigger();
270 public:
271 static const bool value = sizeof(dispatch(trigger())) == sizeof(true_t);
272};
273
274template<class D, class E>
275struct unique_deleter_is_initializable<D, E, false>
276{
277 #if !defined(BOOST_NO_CXX11_RVALUE_REFERENCES)
278 //Clang has some problems with is_rvalue_convertible with non-copyable types
279 //so use intrinsic if available
280 #if defined(BOOST_CLANG)
281 #if __has_feature(is_convertible_to)
282 static const bool value = __is_convertible_to(E, D);
283 #else
284 static const bool value = is_rvalue_convertible<E, D>::value;
285 #endif
286 #else
287 static const bool value = is_rvalue_convertible<E, D>::value;
288 #endif
289
290 #else //!defined(BOOST_NO_CXX11_RVALUE_REFERENCES)
291 //No hope for compilers with move emulation for now. In several compilers is_convertible
292 // leads to errors, so just move the Deleter and see if the conversion works
293 static const bool value = true; /*is_rvalue_convertible<E, D>::value*/
294 #endif
295};
296
297template<class T, class D, class U, class E, class Type = bmupmu::nat>
298struct enable_up_moveconv_constr
299 : bmupmu::enable_if_c
300 < unique_moveconvert_assignable<T, D, U, E>::value && unique_deleter_is_initializable<D, E>::value
301 , Type>
302{};
303
304} //namespace move_upd {
305// @endcond
306
307namespace movelib {
308
309//! A unique pointer is an object that owns another object and
310//! manages that other object through a pointer.
311//!
312//! More precisely, a unique pointer is an object u that stores a pointer to a second object p and will dispose
313//! of p when u is itself destroyed (e.g., when leaving block scope). In this context, u is said to own p.
314//!
315//! The mechanism by which u disposes of p is known as p's associated deleter, a function object whose correct
316//! invocation results in p's appropriate disposition (typically its deletion).
317//!
318//! Let the notation u.p denote the pointer stored by u, and let u.d denote the associated deleter. Upon request,
319//! u can reset (replace) u.p and u.d with another pointer and deleter, but must properly dispose of its owned
320//! object via the associated deleter before such replacement is considered completed.
321//!
322//! Additionally, u can, upon request, transfer ownership to another unique pointer u2. Upon completion of
323//! such a transfer, the following postconditions hold:
324//! - u2.p is equal to the pre-transfer u.p,
325//! - u.p is equal to nullptr, and
326//! - if the pre-transfer u.d maintained state, such state has been transferred to u2.d.
327//!
328//! As in the case of a reset, u2 must properly dispose of its pre-transfer owned object via the pre-transfer
329//! associated deleter before the ownership transfer is considered complete.
330//!
331//! Each object of a type U instantiated from the unique_ptr template specified in this subclause has the strict
332//! ownership semantics, specified above, of a unique pointer. In partial satisfaction of these semantics, each
333//! such U is MoveConstructible and MoveAssignable, but is not CopyConstructible nor CopyAssignable.
334//! The template parameter T of unique_ptr may be an incomplete type.
335//!
336//! The uses of unique_ptr include providing exception safety for dynamically allocated memory, passing
337//! ownership of dynamically allocated memory to a function, and returning dynamically allocated memory from
338//! a function.
339//!
340//! If T is an array type (e.g. unique_ptr<MyType[]>) the interface is slightly altered:
341//! - Pointers to types derived from T are rejected by the constructors, and by reset.
342//! - The observers <tt>operator*</tt> and <tt>operator-></tt> are not provided.
343//! - The indexing observer <tt>operator[]</tt> is provided.
344//!
345//! \tparam T Provides the type of the stored pointer.
346//! \tparam D The deleter type:
347//! - The default type for the template parameter D is default_delete. A client-supplied template argument
348//! D shall be a function object type, lvalue-reference to function, or lvalue-reference to function object type
349//! for which, given a value d of type D and a value ptr of type unique_ptr<T, D>::pointer, the expression
350//! d(ptr) is valid and has the effect of disposing of the pointer as appropriate for that deleter.
351//! - If the deleter's type D is not a reference type, D shall satisfy the requirements of Destructible.
352//! - If the type <tt>remove_reference<D>::type::pointer</tt> exists, it shall satisfy the requirements of NullablePointer.
353template <class T, class D = default_delete<T> >
354class unique_ptr
355{
356 #if defined(BOOST_MOVE_DOXYGEN_INVOKED)
357 public:
358 unique_ptr(const unique_ptr&) = delete;
359 unique_ptr& operator=(const unique_ptr&) = delete;
360 private:
361 #else
362 BOOST_MOVABLE_BUT_NOT_COPYABLE(unique_ptr)
363
364 typedef bmupmu::pointer_type<T, D > pointer_type_obtainer;
365 typedef bmupd::unique_ptr_data
366 <typename pointer_type_obtainer::type, D> data_type;
367 typedef typename bmupd::deleter_types<D>::deleter_arg_type1 deleter_arg_type1;
368 typedef typename bmupd::deleter_types<D>::deleter_arg_type2 deleter_arg_type2;
369 data_type m_data;
370 #endif
371
372 public:
373 //! If the type <tt>remove_reference<D>::type::pointer</tt> exists, then it shall be a
374 //! synonym for <tt>remove_reference<D>::type::pointer</tt>. Otherwise it shall be a
375 //! synonym for T*.
376 typedef typename BOOST_MOVE_SEEDOC(pointer_type_obtainer::type) pointer;
377 //! If T is an array type, then element_type is equal to T. Otherwise, if T is a type
378 //! in the form U[], element_type is equal to U.
379 typedef typename BOOST_MOVE_SEEDOC(bmupmu::remove_extent<T>::type) element_type;
380 typedef D deleter_type;
381
382 //! <b>Requires</b>: D shall satisfy the requirements of DefaultConstructible, and
383 //! that construction shall not throw an exception.
384 //!
385 //! <b>Effects</b>: Constructs a unique_ptr object that owns nothing, value-initializing the
386 //! stored pointer and the stored deleter.
387 //!
388 //! <b>Postconditions</b>: <tt>get() == nullptr</tt>. <tt>get_deleter()</tt> returns a reference to the stored deleter.
389 //!
390 //! <b>Remarks</b>: If this constructor is instantiated with a pointer type or reference type
391 //! for the template argument D, the program is ill-formed.
392 BOOST_CONSTEXPR unique_ptr() BOOST_NOEXCEPT
393 : m_data()
394 {
395 //If this constructor is instantiated with a pointer type or reference type
396 //for the template argument D, the program is ill-formed.
397 BOOST_STATIC_ASSERT(!bmupmu::is_pointer<D>::value);
398 BOOST_STATIC_ASSERT(!bmupmu::is_reference<D>::value);
399 }
400
401 //! <b>Effects</b>: Same as <tt>unique_ptr()</tt> (default constructor).
402 //!
403 BOOST_CONSTEXPR unique_ptr(BOOST_MOVE_DOC0PTR(bmupd::nullptr_type)) BOOST_NOEXCEPT
404 : m_data()
405 {
406 //If this constructor is instantiated with a pointer type or reference type
407 //for the template argument D, the program is ill-formed.
408 BOOST_STATIC_ASSERT(!bmupmu::is_pointer<D>::value);
409 BOOST_STATIC_ASSERT(!bmupmu::is_reference<D>::value);
410 }
411
412 //! <b>Requires</b>: D shall satisfy the requirements of DefaultConstructible, and
413 //! that construction shall not throw an exception.
414 //!
415 //! <b>Effects</b>: Constructs a unique_ptr which owns p, initializing the stored pointer
416 //! with p and value initializing the stored deleter.
417 //!
418 //! <b>Postconditions</b>: <tt>get() == p</tt>. <tt>get_deleter()</tt> returns a reference to the stored deleter.
419 //!
420 //! <b>Remarks</b>: If this constructor is instantiated with a pointer type or reference type
421 //! for the template argument D, the program is ill-formed.
422 //! This constructor shall not participate in overload resolution unless:
423 //! - If T is not an array type and Pointer is implicitly convertible to pointer.
424 //! - If T is an array type and Pointer is a more CV qualified pointer to element_type.
425 template<class Pointer>
426 explicit unique_ptr(Pointer p
427 BOOST_MOVE_DOCIGN(BOOST_MOVE_I typename bmupd::enable_up_ptr<T BOOST_MOVE_I Pointer BOOST_MOVE_I pointer>::type* =0)
428 ) BOOST_NOEXCEPT
429 : m_data(p)
430 {
431 //If T is not an array type, element_type_t<Pointer> derives from T
432 //it uses the default deleter and T has no virtual destructor, then you have a problem
433 BOOST_STATIC_ASSERT(( !::boost::move_upmu::missing_virtual_destructor
434 <D, typename bmupd::get_element_type<Pointer>::type>::value ));
435 //If this constructor is instantiated with a pointer type or reference type
436 //for the template argument D, the program is ill-formed.
437 BOOST_STATIC_ASSERT(!bmupmu::is_pointer<D>::value);
438 BOOST_STATIC_ASSERT(!bmupmu::is_reference<D>::value);
439 }
440
441 //!The signature of this constructor depends upon whether D is a reference type.
442 //! - If D is non-reference type A, then the signature is <tt>unique_ptr(pointer p, const A& d)</tt>.
443 //! - If D is an lvalue-reference type A&, then the signature is <tt>unique_ptr(pointer p, A& d)</tt>.
444 //! - If D is an lvalue-reference type const A&, then the signature is <tt>unique_ptr(pointer p, const A& d)</tt>.
445 //!
446 //!
447 //! <b>Requires</b>: Either
448 //! - D is not an lvalue-reference type and d is an lvalue or const rvalue.
449 //! D shall satisfy the requirements of CopyConstructible, and the copy constructor of D
450 //! shall not throw an exception. This unique_ptr will hold a copy of d.
451 //! - D is an lvalue-reference type and d is an lvalue. the type which D references need not be CopyConstructible nor
452 //! MoveConstructible. This unique_ptr will hold a D which refers to the lvalue d.
453 //!
454 //! <b>Effects</b>: Constructs a unique_ptr object which owns p, initializing the stored pointer with p and
455 //! initializing the deleter as described above.
456 //!
457 //! <b>Postconditions</b>: <tt>get() == p</tt>. <tt>get_deleter()</tt> returns a reference to the stored deleter. If D is a
458 //! reference type then <tt>get_deleter()</tt> returns a reference to the lvalue d.
459 //!
460 //! <b>Remarks</b>: This constructor shall not participate in overload resolution unless:
461 //! - If T is not an array type and Pointer is implicitly convertible to pointer.
462 //! - If T is an array type and Pointer is a more CV qualified pointer to element_type.
463 template<class Pointer>
464 unique_ptr(Pointer p, BOOST_MOVE_SEEDOC(deleter_arg_type1) d1
465 BOOST_MOVE_DOCIGN(BOOST_MOVE_I typename bmupd::enable_up_ptr<T BOOST_MOVE_I Pointer BOOST_MOVE_I pointer>::type* =0)
466 ) BOOST_NOEXCEPT
467 : m_data(p, d1)
468 {
469 //If T is not an array type, element_type_t<Pointer> derives from T
470 //it uses the default deleter and T has no virtual destructor, then you have a problem
471 BOOST_STATIC_ASSERT(( !::boost::move_upmu::missing_virtual_destructor
472 <D, typename bmupd::get_element_type<Pointer>::type>::value ));
473 }
474
475 //! <b>Effects</b>: Same effects as <tt>template<class Pointer> unique_ptr(Pointer p, deleter_arg_type1 d1)</tt>
476 //! and additionally <tt>get() == nullptr</tt>
477 unique_ptr(BOOST_MOVE_DOC0PTR(bmupd::nullptr_type), BOOST_MOVE_SEEDOC(deleter_arg_type1) d1) BOOST_NOEXCEPT
478 : m_data(pointer(), d1)
479 {}
480
481 //! The signature of this constructor depends upon whether D is a reference type.
482 //! - If D is non-reference type A, then the signature is <tt>unique_ptr(pointer p, A&& d)</tt>.
483 //! - If D is an lvalue-reference type A&, then the signature is <tt>unique_ptr(pointer p, A&& d)</tt>.
484 //! - If D is an lvalue-reference type const A&, then the signature is <tt>unique_ptr(pointer p, const A&& d)</tt>.
485 //!
486 //! <b>Requires</b>: Either
487 //! - D is not an lvalue-reference type and d is a non-const rvalue. D
488 //! shall satisfy the requirements of MoveConstructible, and the move constructor
489 //! of D shall not throw an exception. This unique_ptr will hold a value move constructed from d.
490 //! - D is an lvalue-reference type and d is an rvalue, the program is ill-formed.
491 //!
492 //! <b>Effects</b>: Constructs a unique_ptr object which owns p, initializing the stored pointer with p and
493 //! initializing the deleter as described above.
494 //!
495 //! <b>Postconditions</b>: <tt>get() == p</tt>. <tt>get_deleter()</tt> returns a reference to the stored deleter. If D is a
496 //! reference type then <tt>get_deleter()</tt> returns a reference to the lvalue d.
497 //!
498 //! <b>Remarks</b>: This constructor shall not participate in overload resolution unless:
499 //! - If T is not an array type and Pointer is implicitly convertible to pointer.
500 //! - If T is an array type and Pointer is a more CV qualified pointer to element_type.
501 template<class Pointer>
502 unique_ptr(Pointer p, BOOST_MOVE_SEEDOC(deleter_arg_type2) d2
503 BOOST_MOVE_DOCIGN(BOOST_MOVE_I typename bmupd::enable_up_ptr<T BOOST_MOVE_I Pointer BOOST_MOVE_I pointer>::type* =0)
504 ) BOOST_NOEXCEPT
505 : m_data(p, ::boost::move(d2))
506 {
507 //If T is not an array type, element_type_t<Pointer> derives from T
508 //it uses the default deleter and T has no virtual destructor, then you have a problem
509 BOOST_STATIC_ASSERT(( !::boost::move_upmu::missing_virtual_destructor
510 <D, typename bmupd::get_element_type<Pointer>::type>::value ));
511 }
512
513 //! <b>Effects</b>: Same effects as <tt>template<class Pointer> unique_ptr(Pointer p, deleter_arg_type2 d2)</tt>
514 //! and additionally <tt>get() == nullptr</tt>
515 unique_ptr(BOOST_MOVE_DOC0PTR(bmupd::nullptr_type), BOOST_MOVE_SEEDOC(deleter_arg_type2) d2) BOOST_NOEXCEPT
516 : m_data(pointer(), ::boost::move(d2))
517 {}
518
519 //! <b>Requires</b>: If D is not a reference type, D shall satisfy the requirements of MoveConstructible.
520 //! Construction of the deleter from an rvalue of type D shall not throw an exception.
521 //!
522 //! <b>Effects</b>: Constructs a unique_ptr by transferring ownership from u to *this. If D is a reference type,
523 //! this deleter is copy constructed from u's deleter; otherwise, this deleter is move constructed from u's
524 //! deleter.
525 //!
526 //! <b>Postconditions</b>: <tt>get()</tt> yields the value u.get() yielded before the construction. <tt>get_deleter()</tt>
527 //! returns a reference to the stored deleter that was constructed from u.get_deleter(). If D is a
528 //! reference type then <tt>get_deleter()</tt> and <tt>u.get_deleter()</tt> both reference the same lvalue deleter.
529 unique_ptr(BOOST_RV_REF(unique_ptr) u) BOOST_NOEXCEPT
530 : m_data(u.release(), ::boost::move_if_not_lvalue_reference<D>(u.get_deleter()))
531 {}
532
533 //! <b>Requires</b>: If E is not a reference type, construction of the deleter from an rvalue of type E shall be
534 //! well formed and shall not throw an exception. Otherwise, E is a reference type and construction of the
535 //! deleter from an lvalue of type E shall be well formed and shall not throw an exception.
536 //!
537 //! <b>Remarks</b>: This constructor shall not participate in overload resolution unless:
538 //! - <tt>unique_ptr<U, E>::pointer</tt> is implicitly convertible to pointer,
539 //! - U is not an array type, and
540 //! - either D is a reference type and E is the same type as D, or D is not a reference type and E is
541 //! implicitly convertible to D.
542 //!
543 //! <b>Effects</b>: Constructs a unique_ptr by transferring ownership from u to *this. If E is a reference type,
544 //! this deleter is copy constructed from u's deleter; otherwise, this deleter is move constructed from u's deleter.
545 //!
546 //! <b>Postconditions</b>: <tt>get()</tt> yields the value <tt>u.get()</tt> yielded before the construction. <tt>get_deleter()</tt>
547 //! returns a reference to the stored deleter that was constructed from <tt>u.get_deleter()</tt>.
548 template <class U, class E>
549 unique_ptr( BOOST_RV_REF_BEG_IF_CXX11 unique_ptr<U, E> BOOST_RV_REF_END_IF_CXX11 u
550 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)
551 ) BOOST_NOEXCEPT
552 : m_data(u.release(), ::boost::move_if_not_lvalue_reference<E>(u.get_deleter()))
553 {
554 //If T is not an array type, U derives from T
555 //it uses the default deleter and T has no virtual destructor, then you have a problem
556 BOOST_STATIC_ASSERT(( !::boost::move_upmu::missing_virtual_destructor
557 <D, typename unique_ptr<U, E>::pointer>::value ));
558 }
559
560 //! <b>Requires</b>: The expression <tt>get_deleter()(get())</tt> shall be well formed, shall have well-defined behavior,
561 //! and shall not throw exceptions.
562 //!
563 //! <b>Effects</b>: If <tt>get() == nullpt1r</tt> there are no effects. Otherwise <tt>get_deleter()(get())</tt>.
564 //!
565 //! <b>Note</b>: The use of default_delete requires T to be a complete type
566 ~unique_ptr()
567 { if(m_data.m_p) m_data.deleter()(m_data.m_p); }
568
569 //! <b>Requires</b>: If D is not a reference type, D shall satisfy the requirements of MoveAssignable
570 //! and assignment of the deleter from an rvalue of type D shall not throw an exception. Otherwise, D
571 //! is a reference type; <tt>remove_reference<D>::type</tt> shall satisfy the CopyAssignable requirements and
572 //! assignment of the deleter from an lvalue of type D shall not throw an exception.
573 //!
574 //! <b>Effects</b>: Transfers ownership from u to *this as if by calling <tt>reset(u.release())</tt> followed
575 //! by <tt>get_deleter() = std::forward<D>(u.get_deleter())</tt>.
576 //!
577 //! <b>Returns</b>: *this.
578 unique_ptr& operator=(BOOST_RV_REF(unique_ptr) u) BOOST_NOEXCEPT
579 {
580 this->reset(u.release());
581 m_data.deleter() = ::boost::move_if_not_lvalue_reference<D>(u.get_deleter());
582 return *this;
583 }
584
585 //! <b>Requires</b>: If E is not a reference type, assignment of the deleter from an rvalue of type E shall be
586 //! well-formed and shall not throw an exception. Otherwise, E is a reference type and assignment of the
587 //! deleter from an lvalue of type E shall be well-formed and shall not throw an exception.
588 //!
589 //! <b>Remarks</b>: This operator shall not participate in overload resolution unless:
590 //! - <tt>unique_ptr<U, E>::pointer</tt> is implicitly convertible to pointer and
591 //! - U is not an array type.
592 //!
593 //! <b>Effects</b>: Transfers ownership from u to *this as if by calling <tt>reset(u.release())</tt> followed by
594 //! <tt>get_deleter() = std::forward<E>(u.get_deleter())</tt>.
595 //!
596 //! <b>Returns</b>: *this.
597 template <class U, class E>
598 BOOST_MOVE_DOC1ST(unique_ptr&, typename bmupd::enable_up_moveconv_assign
599 <T BOOST_MOVE_I D BOOST_MOVE_I U BOOST_MOVE_I E BOOST_MOVE_I unique_ptr &>::type)
600 operator=(BOOST_RV_REF_BEG unique_ptr<U, E> BOOST_RV_REF_END u) BOOST_NOEXCEPT
601 {
602 this->reset(u.release());
603 m_data.deleter() = ::boost::move_if_not_lvalue_reference<E>(u.get_deleter());
604 return *this;
605 }
606
607 //! <b>Effects</b>: <tt>reset()</tt>.
608 //!
609 //! <b>Postcondition</b>: <tt>get() == nullptr</tt>
610 //!
611 //! <b>Returns</b>: *this.
612 unique_ptr& operator=(BOOST_MOVE_DOC0PTR(bmupd::nullptr_type)) BOOST_NOEXCEPT
613 { this->reset(); return *this; }
614
615 //! <b>Requires</b>: <tt>get() != nullptr</tt>.
616 //!
617 //! <b>Returns</b>: <tt>*get()</tt>.
618 //!
619 //! <b>Remarks</b: If T is an array type, the program is ill-formed.
620 BOOST_MOVE_DOC1ST(element_type&, typename bmupmu::add_lvalue_reference<element_type>::type)
621 operator*() const BOOST_NOEXCEPT
622 {
623 BOOST_STATIC_ASSERT((!bmupmu::is_array<T>::value));
624 return *m_data.m_p;
625 }
626
627 //! <b>Requires</b>: i < the number of elements in the array to which the stored pointer points.
628 //!
629 //! <b>Returns</b>: <tt>get()[i]</tt>.
630 //!
631 //! <b>Remarks</b: If T is not an array type, the program is ill-formed.
632 BOOST_MOVE_DOC1ST(element_type&, typename bmupmu::add_lvalue_reference<element_type>::type)
633 operator[](std::size_t i) const BOOST_NOEXCEPT
634 {
635 BOOST_ASSERT( bmupmu::extent<T>::value == 0 || i < bmupmu::extent<T>::value );
636 BOOST_ASSERT(m_data.m_p);
637 return m_data.m_p[i];
638 }
639
640 //! <b>Requires</b>: <tt>get() != nullptr</tt>.
641 //!
642 //! <b>Returns</b>: <tt>get()</tt>.
643 //!
644 //! <b>Note</b>: use typically requires that T be a complete type.
645 //!
646 //! <b>Remarks</b: If T is an array type, the program is ill-formed.
647 pointer operator->() const BOOST_NOEXCEPT
648 {
649 BOOST_STATIC_ASSERT((!bmupmu::is_array<T>::value));
650 BOOST_ASSERT(m_data.m_p);
651 return m_data.m_p;
652 }
653
654 //! <b>Returns</b>: The stored pointer.
655 //!
656 pointer get() const BOOST_NOEXCEPT
657 { return m_data.m_p; }
658
659 //! <b>Returns</b>: A reference to the stored deleter.
660 //!
661 BOOST_MOVE_DOC1ST(D&, typename bmupmu::add_lvalue_reference<D>::type)
662 get_deleter() BOOST_NOEXCEPT
663 { return m_data.deleter(); }
664
665 //! <b>Returns</b>: A reference to the stored deleter.
666 //!
667 BOOST_MOVE_DOC1ST(const D&, typename bmupmu::add_const_lvalue_reference<D>::type)
668 get_deleter() const BOOST_NOEXCEPT
669 { return m_data.deleter(); }
670
671 #ifdef BOOST_MOVE_DOXYGEN_INVOKED
672 //! <b>Returns</b>: Returns: get() != nullptr.
673 //!
674 explicit operator bool
675 #else
676 operator bmupd::explicit_bool_arg
677 #endif
678 ()const BOOST_NOEXCEPT
679 {
680 return m_data.m_p
681 ? &bmupd::bool_conversion::for_bool
682 : bmupd::explicit_bool_arg(0);
683 }
684
685 //! <b>Postcondition</b>: <tt>get() == nullptr</tt>.
686 //!
687 //! <b>Returns</b>: The value <tt>get()</tt> had at the start of the call to release.
688 pointer release() BOOST_NOEXCEPT
689 {
690 const pointer tmp = m_data.m_p;
691 m_data.m_p = pointer();
692 return tmp;
693 }
694
695 //! <b>Requires</b>: The expression <tt>get_deleter()(get())</tt> shall be well formed, shall have well-defined behavior,
696 //! and shall not throw exceptions.
697 //!
698 //! <b>Effects</b>: assigns p to the stored pointer, and then if the old value of the stored pointer, old_p, was not
699 //! equal to nullptr, calls <tt>get_deleter()(old_p)</tt>. Note: The order of these operations is significant
700 //! because the call to <tt>get_deleter()</tt> may destroy *this.
701 //!
702 //! <b>Postconditions</b>: <tt>get() == p</tt>. Note: The postcondition does not hold if the call to <tt>get_deleter()</tt>
703 //! destroys *this since <tt>this->get()</tt> is no longer a valid expression.
704 //!
705 //! <b>Remarks</b>: This constructor shall not participate in overload resolution unless:
706 //! - If T is not an array type and Pointer is implicitly convertible to pointer.
707 //! - If T is an array type and Pointer is a more CV qualified pointer to element_type.
708 template<class Pointer>
709 BOOST_MOVE_DOC1ST(void, typename bmupd::enable_up_ptr<T BOOST_MOVE_I Pointer BOOST_MOVE_I pointer BOOST_MOVE_I void>::type)
710 reset(Pointer p) BOOST_NOEXCEPT
711 {
712 //If T is not an array type, element_type_t<Pointer> derives from T
713 //it uses the default deleter and T has no virtual destructor, then you have a problem
714 BOOST_STATIC_ASSERT(( !::boost::move_upmu::missing_virtual_destructor
715 <D, typename bmupd::get_element_type<Pointer>::type>::value ));
716 pointer tmp = m_data.m_p;
717 m_data.m_p = p;
718 if(tmp) m_data.deleter()(tmp);
719 }
720
721 //! <b>Requires</b>: The expression <tt>get_deleter()(get())</tt> shall be well formed, shall have well-defined behavior,
722 //! and shall not throw exceptions.
723 //!
724 //! <b>Effects</b>: assigns nullptr to the stored pointer, and then if the old value of the stored pointer, old_p, was not
725 //! equal to nullptr, calls <tt>get_deleter()(old_p)</tt>. Note: The order of these operations is significant
726 //! because the call to <tt>get_deleter()</tt> may destroy *this.
727 //!
728 //! <b>Postconditions</b>: <tt>get() == p</tt>. Note: The postcondition does not hold if the call to <tt>get_deleter()</tt>
729 //! destroys *this since <tt>this->get()</tt> is no longer a valid expression.
730 void reset() BOOST_NOEXCEPT
731 { this->reset(pointer()); }
732
733 //! <b>Effects</b>: Same as <tt>reset()</tt>
734 //!
735 void reset(BOOST_MOVE_DOC0PTR(bmupd::nullptr_type)) BOOST_NOEXCEPT
736 { this->reset(); }
737
738 //! <b>Requires</b>: <tt>get_deleter()</tt> shall be swappable and shall not throw an exception under swap.
739 //!
740 //! <b>Effects</b>: Invokes swap on the stored pointers and on the stored deleters of *this and u.
741 void swap(unique_ptr& u) BOOST_NOEXCEPT
742 {
743 ::boost::adl_move_swap(m_data.m_p, u.m_data.m_p);
744 ::boost::adl_move_swap(m_data.deleter(), u.m_data.deleter());
745 }
746};
747
748//! <b>Effects</b>: Calls <tt>x.swap(y)</tt>.
749//!
750template <class T, class D>
751inline void swap(unique_ptr<T, D> &x, unique_ptr<T, D> &y) BOOST_NOEXCEPT
752{ x.swap(y); }
753
754//! <b>Returns</b>: <tt>x.get() == y.get()</tt>.
755//!
756template <class T1, class D1, class T2, class D2>
757inline bool operator==(const unique_ptr<T1, D1> &x, const unique_ptr<T2, D2> &y)
758{ return x.get() == y.get(); }
759
760//! <b>Returns</b>: <tt>x.get() != y.get()</tt>.
761//!
762template <class T1, class D1, class T2, class D2>
763inline bool operator!=(const unique_ptr<T1, D1> &x, const unique_ptr<T2, D2> &y)
764{ return x.get() != y.get(); }
765
766//! <b>Returns</b>: x.get() < y.get().
767//!
768//! <b>Remarks</b>: This comparison shall induce a
769//! strict weak ordering betwen pointers.
770template <class T1, class D1, class T2, class D2>
771inline bool operator<(const unique_ptr<T1, D1> &x, const unique_ptr<T2, D2> &y)
772{ return x.get() < y.get(); }
773
774//! <b>Returns</b>: !(y < x).
775//!
776template <class T1, class D1, class T2, class D2>
777inline bool operator<=(const unique_ptr<T1, D1> &x, const unique_ptr<T2, D2> &y)
778{ return !(y < x); }
779
780//! <b>Returns</b>: y < x.
781//!
782template <class T1, class D1, class T2, class D2>
783inline bool operator>(const unique_ptr<T1, D1> &x, const unique_ptr<T2, D2> &y)
784{ return y < x; }
785
786//! <b>Returns</b>:!(x < y).
787//!
788template <class T1, class D1, class T2, class D2>
789inline bool operator>=(const unique_ptr<T1, D1> &x, const unique_ptr<T2, D2> &y)
790{ return !(x < y); }
791
792//! <b>Returns</b>:!x.
793//!
794template <class T, class D>
795inline bool operator==(const unique_ptr<T, D> &x, BOOST_MOVE_DOC0PTR(bmupd::nullptr_type)) BOOST_NOEXCEPT
796{ return !x; }
797
798//! <b>Returns</b>:!x.
799//!
800template <class T, class D>
801inline bool operator==(BOOST_MOVE_DOC0PTR(bmupd::nullptr_type), const unique_ptr<T, D> &x) BOOST_NOEXCEPT
802{ return !x; }
803
804//! <b>Returns</b>: (bool)x.
805//!
806template <class T, class D>
807inline bool operator!=(const unique_ptr<T, D> &x, BOOST_MOVE_DOC0PTR(bmupd::nullptr_type)) BOOST_NOEXCEPT
808{ return !!x; }
809
810//! <b>Returns</b>: (bool)x.
811//!
812template <class T, class D>
813inline bool operator!=(BOOST_MOVE_DOC0PTR(bmupd::nullptr_type), const unique_ptr<T, D> &x) BOOST_NOEXCEPT
814{ return !!x; }
815
816//! <b>Requires</b>: <tt>operator </tt> shall induce a strict weak ordering on unique_ptr<T, D>::pointer values.
817//!
818//! <b>Returns</b>: Returns <tt>x.get() < pointer()</tt>.
819template <class T, class D>
820inline bool operator<(const unique_ptr<T, D> &x, BOOST_MOVE_DOC0PTR(bmupd::nullptr_type))
821{ return x.get() < typename unique_ptr<T, D>::pointer(); }
822
823//! <b>Requires</b>: <tt>operator </tt> shall induce a strict weak ordering on unique_ptr<T, D>::pointer values.
824//!
825//! <b>Returns</b>: Returns <tt>pointer() < x.get()</tt>.
826template <class T, class D>
827inline bool operator<(BOOST_MOVE_DOC0PTR(bmupd::nullptr_type), const unique_ptr<T, D> &x)
828{ return typename unique_ptr<T, D>::pointer() < x.get(); }
829
830//! <b>Returns</b>: <tt>nullptr < x</tt>.
831//!
832template <class T, class D>
833inline bool operator>(const unique_ptr<T, D> &x, BOOST_MOVE_DOC0PTR(bmupd::nullptr_type))
834{ return x.get() > typename unique_ptr<T, D>::pointer(); }
835
836//! <b>Returns</b>: <tt>x < nullptr</tt>.
837//!
838template <class T, class D>
839inline bool operator>(BOOST_MOVE_DOC0PTR(bmupd::nullptr_type), const unique_ptr<T, D> &x)
840{ return typename unique_ptr<T, D>::pointer() > x.get(); }
841
842//! <b>Returns</b>: <tt>!(nullptr < x)</tt>.
843//!
844template <class T, class D>
845inline bool operator<=(const unique_ptr<T, D> &x, BOOST_MOVE_DOC0PTR(bmupd::nullptr_type))
846{ return !(bmupd::nullptr_type() < x); }
847
848//! <b>Returns</b>: <tt>!(x < nullptr)</tt>.
849//!
850template <class T, class D>
851inline bool operator<=(BOOST_MOVE_DOC0PTR(bmupd::nullptr_type), const unique_ptr<T, D> &x)
852{ return !(x < bmupd::nullptr_type()); }
853
854//! <b>Returns</b>: <tt>!(x < nullptr)</tt>.
855//!
856template <class T, class D>
857inline bool operator>=(const unique_ptr<T, D> &x, BOOST_MOVE_DOC0PTR(bmupd::nullptr_type))
858{ return !(x < bmupd::nullptr_type()); }
859
860//! <b>Returns</b>: <tt>!(nullptr < x)</tt>.
861//!
862template <class T, class D>
863inline bool operator>=(BOOST_MOVE_DOC0PTR(bmupd::nullptr_type), const unique_ptr<T, D> &x)
864{ return !(bmupd::nullptr_type() < x); }
865
866} //namespace movelib {
867} //namespace boost{
868
869#include <boost/move/detail/config_end.hpp>
870
871#endif //#ifndef BOOST_MOVE_UNIQUE_PTR_HPP_INCLUDED
872