1 // unique_ptr implementation -*- C++ -*-
3 // Copyright (C) 2008, 2009 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 2, 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 // You should have received a copy of the GNU General Public License
17 // along with this library; see the file COPYING. If not, write to
18 // the Free Software Foundation, 51 Franklin Street, Fifth Floor,
19 // Boston, MA 02110-1301, USA.
21 // As a special exception, you may use this file as part of a free software
22 // library without restriction. Specifically, if other files instantiate
23 // templates or use macros or inline functions from this file, or you compile
24 // this file and link it with other files to produce an executable, this
25 // file does not by itself cause the resulting executable to be covered by
26 // the GNU General Public License. This exception does not however
27 // invalidate any other reasons why the executable file might be covered by
28 // the GNU General Public License.
30 /** @file unique_ptr.h
31 * This is an internal header file, included by other library headers.
32 * You should not attempt to use it directly.
36 #define _UNIQUE_PTR_H 1
38 #ifndef __GXX_EXPERIMENTAL_CXX0X__
39 # include <c++0x_warning.h>
42 #include <bits/c++config.h>
43 #include <debug/debug.h>
44 #include <type_traits>
48 _GLIBCXX_BEGIN_NAMESPACE(std)
50 /// Primary template, default_delete.
51 template<typename _Tp>
56 template<typename _Up>
57 default_delete(const default_delete<_Up>&) { }
60 operator()(_Tp* __ptr) const
62 static_assert(sizeof(_Tp)>0,
63 "can't delete pointer to incomplete type");
68 // _GLIBCXX_RESOLVE_LIB_DEFECTS
69 // DR 740 - omit specialization for array objects with a compile time length
70 /// Specialization, default_delete.
71 template<typename _Tp>
72 struct default_delete<_Tp[]>
75 operator()(_Tp* __ptr) const
77 static_assert(sizeof(_Tp)>0,
78 "can't delete pointer to incomplete type");
83 /// 20.7.12.2 unique_ptr for single objects.
84 template <typename _Tp, typename _Tp_Deleter = default_delete<_Tp> >
87 typedef std::tuple<_Tp*, _Tp_Deleter> __tuple_type;
88 typedef __tuple_type unique_ptr::* __unspecified_bool_type;
89 typedef _Tp* unique_ptr::* __unspecified_pointer_type;
93 typedef _Tp element_type;
94 typedef _Tp_Deleter deleter_type;
98 : _M_t(pointer(), deleter_type())
99 { static_assert(!std::is_pointer<deleter_type>::value,
100 "constructed with null function pointer deleter"); }
103 unique_ptr(pointer __p)
104 : _M_t(__p, deleter_type())
105 { static_assert(!std::is_pointer<deleter_type>::value,
106 "constructed with null function pointer deleter"); }
108 unique_ptr(pointer __p,
109 typename std::conditional<std::is_reference<deleter_type>::value,
110 deleter_type, const deleter_type&>::type __d)
113 unique_ptr(pointer __p,
114 typename std::remove_reference<deleter_type>::type&& __d)
115 : _M_t(std::move(__p), std::move(__d))
116 { static_assert(!std::is_reference<deleter_type>::value,
117 "rvalue deleter bound to reference"); }
119 // Move constructors.
120 unique_ptr(unique_ptr&& __u)
121 : _M_t(__u.release(), std::forward<deleter_type>(__u.get_deleter())) { }
123 template<typename _Up, typename _Up_Deleter>
124 unique_ptr(unique_ptr<_Up, _Up_Deleter>&& __u)
125 : _M_t(__u.release(), std::forward<deleter_type>(__u.get_deleter()))
129 ~unique_ptr() { reset(); }
133 operator=(unique_ptr&& __u)
135 reset(__u.release());
136 get_deleter() = std::move(__u.get_deleter());
140 template<typename _Up, typename _Up_Deleter>
142 operator=(unique_ptr<_Up, _Up_Deleter>&& __u)
144 reset(__u.release());
145 get_deleter() = std::move(__u.get_deleter());
150 operator=(__unspecified_pointer_type)
157 typename std::add_lvalue_reference<element_type>::type operator*() const
159 _GLIBCXX_DEBUG_ASSERT(get() != 0);
166 _GLIBCXX_DEBUG_ASSERT(get() != 0);
172 { return std::get<0>(_M_t); }
174 typename std::add_lvalue_reference<deleter_type>::type
176 { return std::get<1>(_M_t); }
178 typename std::add_lvalue_reference<
179 typename std::add_const<deleter_type>::type
182 { return std::get<1>(_M_t); }
184 operator __unspecified_bool_type () const
185 { return get() == 0 ? 0 : &unique_ptr::_M_t; }
192 std::get<0>(_M_t) = 0;
197 reset(pointer __p = pointer())
201 get_deleter()(get());
202 std::get<0>(_M_t) = __p;
207 swap(unique_ptr&& __u)
210 swap(_M_t, __u._M_t);
213 // Disable copy from lvalue.
214 unique_ptr(const unique_ptr&) = delete;
216 template<typename _Up, typename _Up_Deleter>
217 unique_ptr(const unique_ptr<_Up, _Up_Deleter>&) = delete;
219 unique_ptr& operator=(const unique_ptr&) = delete;
221 template<typename _Up, typename _Up_Deleter>
222 unique_ptr& operator=(const unique_ptr<_Up, _Up_Deleter>&) = delete;
228 /// 20.7.12.3 unique_ptr for array objects with a runtime length
229 // [unique.ptr.runtime]
230 // _GLIBCXX_RESOLVE_LIB_DEFECTS
231 // DR 740 - omit specialization for array objects with a compile time length
232 template<typename _Tp, typename _Tp_Deleter>
233 class unique_ptr<_Tp[], _Tp_Deleter>
235 typedef std::tuple<_Tp*, _Tp_Deleter> __tuple_type;
236 typedef __tuple_type unique_ptr::* __unspecified_bool_type;
237 typedef _Tp* unique_ptr::* __unspecified_pointer_type;
240 typedef _Tp* pointer;
241 typedef _Tp element_type;
242 typedef _Tp_Deleter deleter_type;
246 : _M_t(pointer(), deleter_type())
247 { static_assert(!std::is_pointer<deleter_type>::value,
248 "constructed with null function pointer deleter"); }
251 unique_ptr(pointer __p)
252 : _M_t(__p, deleter_type())
253 { static_assert(!std::is_pointer<deleter_type>::value,
254 "constructed with null function pointer deleter"); }
256 unique_ptr(pointer __p,
257 typename std::conditional<std::is_reference<deleter_type>::value,
258 deleter_type, const deleter_type&>::type __d)
261 unique_ptr(pointer __p,
262 typename std::remove_reference<deleter_type>::type && __d)
263 : _M_t(std::move(__p), std::move(__d))
264 { static_assert(!std::is_reference<deleter_type>::value,
265 "rvalue deleter bound to reference"); }
267 // Move constructors.
268 unique_ptr(unique_ptr&& __u)
269 : _M_t(__u.release(), std::forward<deleter_type>(__u.get_deleter())) { }
271 template<typename _Up, typename _Up_Deleter>
272 unique_ptr(unique_ptr<_Up, _Up_Deleter>&& __u)
273 : _M_t(__u.release(), std::forward<deleter_type>(__u.get_deleter()))
277 ~unique_ptr() { reset(); }
281 operator=(unique_ptr&& __u)
283 reset(__u.release());
284 get_deleter() = std::move(__u.get_deleter());
288 template<typename _Up, typename _Up_Deleter>
290 operator=(unique_ptr<_Up, _Up_Deleter>&& __u)
292 reset(__u.release());
293 get_deleter() = std::move(__u.get_deleter());
298 operator=(__unspecified_pointer_type)
305 typename std::add_lvalue_reference<element_type>::type
306 operator[](size_t __i) const
308 _GLIBCXX_DEBUG_ASSERT(get() != 0);
314 { return std::get<0>(_M_t); }
316 typename std::add_lvalue_reference<deleter_type>::type
318 { return std::get<1>(_M_t); }
320 typename std::add_lvalue_reference<
321 typename std::add_const<deleter_type>::type
324 { return std::get<1>(_M_t); }
326 operator __unspecified_bool_type () const
327 { return get() == 0 ? 0 : &unique_ptr::_M_t; }
334 std::get<0>(_M_t) = 0;
339 reset(pointer __p = pointer())
343 get_deleter()(get());
344 std::get<0>(_M_t) = __p;
349 template<typename _Up>
350 void reset(_Up) = delete;
353 swap(unique_ptr&& __u)
356 swap(_M_t, __u._M_t);
359 // Disable copy from lvalue.
360 unique_ptr(const unique_ptr&) = delete;
361 unique_ptr& operator=(const unique_ptr&) = delete;
363 // Disable construction from convertible pointer types.
364 // (N2315 - 20.6.5.3.1)
365 template<typename _Up>
366 unique_ptr(_Up*, typename
367 std::conditional<std::is_reference<deleter_type>::value,
368 deleter_type, const deleter_type&>::type,
369 typename std::enable_if<std::is_convertible<_Up*,
370 pointer>::value>::type* = 0) = delete;
372 template<typename _Up>
373 unique_ptr(_Up*, typename std::remove_reference<deleter_type>::type&&,
374 typename std::enable_if<std::is_convertible<_Up*,
375 pointer>::value>::type* = 0) = delete;
377 template<typename _Up>
379 unique_ptr(_Up*, typename std::enable_if<std::is_convertible<_Up*,
380 pointer>::value>::type* = 0) = delete;
386 template<typename _Tp, typename _Tp_Deleter>
388 swap(unique_ptr<_Tp, _Tp_Deleter>& __x,
389 unique_ptr<_Tp, _Tp_Deleter>& __y)
392 template<typename _Tp, typename _Tp_Deleter>
394 swap(unique_ptr<_Tp, _Tp_Deleter>&& __x,
395 unique_ptr<_Tp, _Tp_Deleter>& __y)
398 template<typename _Tp, typename _Tp_Deleter>
400 swap(unique_ptr<_Tp, _Tp_Deleter>& __x,
401 unique_ptr<_Tp, _Tp_Deleter>&& __y)
404 template<typename _Tp, typename _Tp_Deleter,
405 typename _Up, typename _Up_Deleter>
407 operator==(const unique_ptr<_Tp, _Tp_Deleter>& __x,
408 const unique_ptr<_Up, _Up_Deleter>& __y)
409 { return __x.get() == __y.get(); }
411 template<typename _Tp, typename _Tp_Deleter,
412 typename _Up, typename _Up_Deleter>
414 operator!=(const unique_ptr<_Tp, _Tp_Deleter>& __x,
415 const unique_ptr<_Up, _Up_Deleter>& __y)
416 { return !(__x.get() == __y.get()); }
418 template<typename _Tp, typename _Tp_Deleter,
419 typename _Up, typename _Up_Deleter>
421 operator<(const unique_ptr<_Tp, _Tp_Deleter>& __x,
422 const unique_ptr<_Up, _Up_Deleter>& __y)
423 { return __x.get() < __y.get(); }
425 template<typename _Tp, typename _Tp_Deleter,
426 typename _Up, typename _Up_Deleter>
428 operator<=(const unique_ptr<_Tp, _Tp_Deleter>& __x,
429 const unique_ptr<_Up, _Up_Deleter>& __y)
430 { return !(__y.get() < __x.get()); }
432 template<typename _Tp, typename _Tp_Deleter,
433 typename _Up, typename _Up_Deleter>
435 operator>(const unique_ptr<_Tp, _Tp_Deleter>& __x,
436 const unique_ptr<_Up, _Up_Deleter>& __y)
437 { return __y.get() < __x.get(); }
439 template<typename _Tp, typename _Tp_Deleter,
440 typename _Up, typename _Up_Deleter>
442 operator>=(const unique_ptr<_Tp, _Tp_Deleter>& __x,
443 const unique_ptr<_Up, _Up_Deleter>& __y)
444 { return !(__x.get() < __y.get()); }
446 _GLIBCXX_END_NAMESPACE
448 #endif /* _UNIQUE_PTR_H */