1 // unique_ptr implementation -*- C++ -*-
3 // Copyright (C) 2008, 2009, 2010 Free Software Foundation, Inc.
5 // This file is part of the GNU ISO C++ Library. This library is free
6 // software; you can redistribute it and/or modify it under the
7 // terms of the GNU General Public License as published by the
8 // Free Software Foundation; either version 3, or (at your option)
11 // This library is distributed in the hope that it will be useful,
12 // but WITHOUT ANY WARRANTY; without even the implied warranty of
13 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 // GNU General Public License for more details.
16 // Under Section 7 of GPL version 3, you are granted additional
17 // permissions described in the GCC Runtime Library Exception, version
18 // 3.1, as published by the Free Software Foundation.
20 // You should have received a copy of the GNU General Public License and
21 // a copy of the GCC Runtime Library Exception along with this program;
22 // see the files COPYING3 and COPYING.RUNTIME respectively. If not, see
23 // <http://www.gnu.org/licenses/>.
25 /** @file unique_ptr.h
26 * This is an internal header file, included by other library headers.
27 * You should not attempt to use it directly.
31 #define _UNIQUE_PTR_H 1
33 #include <bits/c++config.h>
34 #include <debug/debug.h>
35 #include <type_traits>
39 _GLIBCXX_BEGIN_NAMESPACE(std)
42 * @addtogroup pointer_abstractions
46 /// Primary template, default_delete.
47 template<typename _Tp>
50 constexpr default_delete() { }
52 template<typename _Up, typename = typename
53 std::enable_if<std::is_convertible<_Up*, _Tp*>::value>::type>
54 default_delete(const default_delete<_Up>&) { }
57 operator()(_Tp* __ptr) const
59 static_assert(sizeof(_Tp)>0,
60 "can't delete pointer to incomplete type");
65 // _GLIBCXX_RESOLVE_LIB_DEFECTS
66 // DR 740 - omit specialization for array objects with a compile time length
67 /// Specialization, default_delete.
68 template<typename _Tp>
69 struct default_delete<_Tp[]>
71 constexpr default_delete() { }
74 operator()(_Tp* __ptr) const
76 static_assert(sizeof(_Tp)>0,
77 "can't delete pointer to incomplete type");
82 /// 20.7.12.2 unique_ptr for single objects.
83 template <typename _Tp, typename _Dp = default_delete<_Tp> >
86 // use SFINAE to determine whether _Del::pointer exists
89 template<typename _Up>
90 static typename _Up::pointer __test(typename _Up::pointer*);
92 template<typename _Up>
93 static _Tp* __test(...);
95 typedef typename remove_reference<_Dp>::type _Del;
98 typedef decltype( __test<_Del>(0)) type;
101 typedef std::tuple<_Tp*, _Dp> __tuple_type;
105 typedef typename _Pointer::type pointer;
106 typedef _Tp element_type;
107 typedef _Dp deleter_type;
109 static_assert(!std::is_pointer<deleter_type>::value,
110 "constructed with null function pointer deleter");
113 constexpr unique_ptr()
118 unique_ptr(pointer __p)
119 : _M_t(__p, deleter_type())
120 { static_assert(!std::is_pointer<deleter_type>::value,
121 "constructed with null function pointer deleter"); }
123 unique_ptr(pointer __p,
124 typename std::conditional<std::is_reference<deleter_type>::value,
125 deleter_type, const deleter_type&>::type __d)
128 unique_ptr(pointer __p,
129 typename std::remove_reference<deleter_type>::type&& __d)
130 : _M_t(std::move(__p), std::move(__d))
131 { static_assert(!std::is_reference<deleter_type>::value,
132 "rvalue deleter bound to reference"); }
134 constexpr unique_ptr(nullptr_t)
135 : _M_t(pointer(), deleter_type())
138 // Move constructors.
139 unique_ptr(unique_ptr&& __u)
140 : _M_t(__u.release(), std::forward<deleter_type>(__u.get_deleter())) { }
142 template<typename _Up, typename _Ep, typename = typename
144 <std::is_convertible<typename unique_ptr<_Up, _Ep>::pointer,
146 && !std::is_array<_Up>::value
147 && ((std::is_reference<_Dp>::value
148 && std::is_same<_Ep, _Dp>::value)
149 || (!std::is_reference<_Dp>::value
150 && std::is_convertible<_Ep, _Dp>::value))>
152 unique_ptr(unique_ptr<_Up, _Ep>&& __u)
153 : _M_t(__u.release(), std::forward<deleter_type>(__u.get_deleter()))
156 #if _GLIBCXX_DEPRECATED
157 template<typename _Up, typename = typename
158 std::enable_if<std::is_convertible<_Up*, _Tp*>::value
160 default_delete<_Tp>>::value>::type>
161 unique_ptr(auto_ptr<_Up>&& __u)
162 : _M_t(__u.release(), deleter_type()) { }
166 ~unique_ptr() { reset(); }
170 operator=(unique_ptr&& __u)
172 reset(__u.release());
173 get_deleter() = std::move(__u.get_deleter());
177 template<typename _Up, typename _Ep, typename = typename
179 <std::is_convertible<typename unique_ptr<_Up, _Ep>::pointer,
181 && !std::is_array<_Up>::value>::type>
183 operator=(unique_ptr<_Up, _Ep>&& __u)
185 reset(__u.release());
186 get_deleter() = std::move(__u.get_deleter());
198 typename std::add_lvalue_reference<element_type>::type
201 _GLIBCXX_DEBUG_ASSERT(get() != pointer());
208 _GLIBCXX_DEBUG_ASSERT(get() != pointer());
214 { return std::get<0>(_M_t); }
218 { return std::get<1>(_M_t); }
222 { return std::get<1>(_M_t); }
224 explicit operator bool() const
225 { return get() == pointer() ? false : true; }
232 std::get<0>(_M_t) = pointer();
237 reset(pointer __p = pointer())
240 swap(std::get<0>(_M_t), __p);
241 if (__p != pointer())
246 swap(unique_ptr& __u)
249 swap(_M_t, __u._M_t);
252 // Disable copy from lvalue.
253 unique_ptr(const unique_ptr&) = delete;
254 unique_ptr& operator=(const unique_ptr&) = delete;
257 /// 20.7.12.3 unique_ptr for array objects with a runtime length
258 // [unique.ptr.runtime]
259 // _GLIBCXX_RESOLVE_LIB_DEFECTS
260 // DR 740 - omit specialization for array objects with a compile time length
261 template<typename _Tp, typename _Dp>
262 class unique_ptr<_Tp[], _Dp>
264 typedef std::tuple<_Tp*, _Dp> __tuple_type;
268 typedef _Tp* pointer;
269 typedef _Tp element_type;
270 typedef _Dp deleter_type;
272 static_assert(!std::is_pointer<deleter_type>::value,
273 "constructed with null function pointer deleter");
276 constexpr unique_ptr()
277 : _M_t(pointer(), deleter_type())
281 unique_ptr(pointer __p)
282 : _M_t(__p, deleter_type())
285 unique_ptr(pointer __p,
286 typename std::conditional<std::is_reference<deleter_type>::value,
287 deleter_type, const deleter_type&>::type __d)
290 unique_ptr(pointer __p,
291 typename std::remove_reference<deleter_type>::type && __d)
292 : _M_t(std::move(__p), std::move(__d))
293 { static_assert(!std::is_reference<deleter_type>::value,
294 "rvalue deleter bound to reference"); }
296 /* TODO: use delegating constructor */
297 constexpr unique_ptr(nullptr_t)
298 : _M_t(pointer(), deleter_type())
301 // Move constructors.
302 unique_ptr(unique_ptr&& __u)
303 : _M_t(__u.release(), std::forward<deleter_type>(__u.get_deleter())) { }
305 template<typename _Up, typename _Ep>
306 unique_ptr(unique_ptr<_Up, _Ep>&& __u)
307 : _M_t(__u.release(), std::forward<deleter_type>(__u.get_deleter()))
311 ~unique_ptr() { reset(); }
315 operator=(unique_ptr&& __u)
317 reset(__u.release());
318 get_deleter() = std::move(__u.get_deleter());
322 template<typename _Up, typename _Ep>
324 operator=(unique_ptr<_Up, _Ep>&& __u)
326 reset(__u.release());
327 get_deleter() = std::move(__u.get_deleter());
339 typename std::add_lvalue_reference<element_type>::type
340 operator[](size_t __i) const
342 _GLIBCXX_DEBUG_ASSERT(get() != pointer());
348 { return std::get<0>(_M_t); }
352 { return std::get<1>(_M_t); }
356 { return std::get<1>(_M_t); }
358 explicit operator bool() const
359 { return get() == pointer() ? false : true; }
366 std::get<0>(_M_t) = pointer();
371 reset(pointer __p = pointer())
374 swap(std::get<0>(_M_t), __p);
383 std::get<0>(_M_t) = pointer();
389 template<typename _Up>
390 void reset(_Up) = delete;
393 swap(unique_ptr& __u)
396 swap(_M_t, __u._M_t);
399 // Disable copy from lvalue.
400 unique_ptr(const unique_ptr&) = delete;
401 unique_ptr& operator=(const unique_ptr&) = delete;
403 // Disable construction from convertible pointer types.
404 // (N2315 - 20.6.5.3.1)
405 template<typename _Up>
406 unique_ptr(_Up*, typename
407 std::conditional<std::is_reference<deleter_type>::value,
408 deleter_type, const deleter_type&>::type,
409 typename std::enable_if<std::is_convertible<_Up*,
410 pointer>::value>::type* = 0) = delete;
412 template<typename _Up>
413 unique_ptr(_Up*, typename std::remove_reference<deleter_type>::type&&,
414 typename std::enable_if<std::is_convertible<_Up*,
415 pointer>::value>::type* = 0) = delete;
417 template<typename _Up>
419 unique_ptr(_Up*, typename std::enable_if<std::is_convertible<_Up*,
420 pointer>::value>::type* = 0) = delete;
423 template<typename _Tp, typename _Dp>
425 swap(unique_ptr<_Tp, _Dp>& __x,
426 unique_ptr<_Tp, _Dp>& __y)
429 template<typename _Tp, typename _Dp,
430 typename _Up, typename _Ep>
432 operator==(const unique_ptr<_Tp, _Dp>& __x,
433 const unique_ptr<_Up, _Ep>& __y)
434 { return __x.get() == __y.get(); }
436 template<typename _Tp, typename _Dp>
438 operator==(const unique_ptr<_Tp, _Dp>& __x, nullptr_t)
439 { return __x.get() == nullptr; }
441 template<typename _Tp, typename _Dp>
443 operator==(nullptr_t, const unique_ptr<_Tp, _Dp>& __y)
444 { return nullptr == __y.get(); }
446 template<typename _Tp, typename _Dp,
447 typename _Up, typename _Ep>
449 operator!=(const unique_ptr<_Tp, _Dp>& __x,
450 const unique_ptr<_Up, _Ep>& __y)
451 { return !(__x.get() == __y.get()); }
453 template<typename _Tp, typename _Dp>
455 operator!=(const unique_ptr<_Tp, _Dp>& __x, nullptr_t)
456 { return __x.get() != nullptr; }
458 template<typename _Tp, typename _Dp>
460 operator!=(nullptr_t, const unique_ptr<_Tp, _Dp>& __y)
461 { return nullptr != __y.get(); }
463 template<typename _Tp, typename _Dp,
464 typename _Up, typename _Ep>
466 operator<(const unique_ptr<_Tp, _Dp>& __x,
467 const unique_ptr<_Up, _Ep>& __y)
468 { return __x.get() < __y.get(); }
470 template<typename _Tp, typename _Dp,
471 typename _Up, typename _Ep>
473 operator<=(const unique_ptr<_Tp, _Dp>& __x,
474 const unique_ptr<_Up, _Ep>& __y)
475 { return !(__y.get() < __x.get()); }
477 template<typename _Tp, typename _Dp,
478 typename _Up, typename _Ep>
480 operator>(const unique_ptr<_Tp, _Dp>& __x,
481 const unique_ptr<_Up, _Ep>& __y)
482 { return __y.get() < __x.get(); }
484 template<typename _Tp, typename _Dp,
485 typename _Up, typename _Ep>
487 operator>=(const unique_ptr<_Tp, _Dp>& __x,
488 const unique_ptr<_Up, _Ep>& __y)
489 { return !(__x.get() < __y.get()); }
491 /// std::hash specialization for unique_ptr.
492 template<typename _Tp, typename _Dp>
493 struct hash<unique_ptr<_Tp, _Dp>>
494 : public std::unary_function<unique_ptr<_Tp, _Dp>, size_t>
497 operator()(const unique_ptr<_Tp, _Dp>& __u) const
499 typedef unique_ptr<_Tp, _Dp> _UP;
500 return std::hash<typename _UP::pointer>()(__u.get());
504 // @} group pointer_abstractions
506 _GLIBCXX_END_NAMESPACE
508 #endif /* _UNIQUE_PTR_H */