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weakPointerTo.h
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1/**
2 * PANDA 3D SOFTWARE
3 * Copyright (c) Carnegie Mellon University. All rights reserved.
4 *
5 * All use of this software is subject to the terms of the revised BSD
6 * license. You should have received a copy of this license along
7 * with this source code in a file named "LICENSE."
8 *
9 * @file weakPointerTo.h
10 * @author drose
11 * @date 2004-09-27
12 */
13
14#ifndef WEAKPOINTERTO_H
15#define WEAKPOINTERTO_H
16
17#include "pandabase.h"
18#include "weakPointerToBase.h"
19#include "pointerTo.h"
20
21/**
22 * WeakPointerTo is similar to PointerTo, except that it does not actually
23 * prevent the referenced pointer from deleting. Instead, the referenced
24 * pointer is allowed to delete, but if this happens then was_deleted() will
25 * return true, and it will be an assertion error to dereference the pointer
26 * thereafter.
27 */
28 template <class T>
29 class WeakPointerTo : public WeakPointerToBase<T> {
30 public:
31 typedef typename WeakPointerToBase<T>::To To;
32PUBLISHED:
33 constexpr WeakPointerTo() noexcept = default;
34 INLINE WeakPointerTo(To *ptr);
35 INLINE WeakPointerTo(const PointerTo<T> &copy);
36 INLINE WeakPointerTo(const WeakPointerTo<T> &copy);
37
38 public:
39 INLINE WeakPointerTo(WeakPointerTo<T> &&from) noexcept;
40
41 template<class Y>
42 ALWAYS_INLINE WeakPointerTo(const WeakPointerTo<Y> &r) noexcept;
43 template<class Y>
44 ALWAYS_INLINE WeakPointerTo(const PointerTo<Y> &r) noexcept;
45 template<class Y>
46 ALWAYS_INLINE WeakPointerTo(WeakPointerTo<Y> &&r) noexcept;
47
48 INLINE To &operator *() const;
49 INLINE To *operator -> () const;
50 // MSVC.NET 2005 insists that we use T *, and not To *, here.
51 INLINE explicit operator T *() const;
52
53PUBLISHED:
54 INLINE PointerTo<T> lock() const;
55 INLINE To *p() const;
56 INLINE To *get_orig() const;
57
58 INLINE WeakPointerTo<T> &operator = (To *ptr);
59 INLINE WeakPointerTo<T> &operator = (const PointerTo<T> &copy);
60 INLINE WeakPointerTo<T> &operator = (const WeakPointerTo<T> &copy);
61
62 public:
63 INLINE WeakPointerTo<T> &operator = (WeakPointerTo<T> &&from) noexcept;
64
65 template<class Y>
66 ALWAYS_INLINE WeakPointerTo<T> &operator = (const WeakPointerTo<Y> &r) noexcept;
67 template<class Y>
68 ALWAYS_INLINE WeakPointerTo<T> &operator = (const PointerTo<Y> &r) noexcept;
69 template<class Y>
70 ALWAYS_INLINE WeakPointerTo<T> &operator = (WeakPointerTo<Y> &&r) noexcept;
71
72PUBLISHED:
73 // This function normally wouldn't need to be redefined here, but we do so
74 // anyway just to help out interrogate (which doesn't seem to want to
75 // automatically export the WeakPointerToBase class). When this works again
76 // in interrogate, we can remove this.
77 INLINE void clear() { WeakPointerToBase<T>::clear(); }
78};
79
80
81/**
82 * A WeakConstPointerTo is similar to a WeakPointerTo, except it keeps a const
83 * pointer to the thing, that will be cleared to NULL when the thing deleted.
84 */
85 template <class T>
86 class WeakConstPointerTo : public WeakPointerToBase<T> {
87 public:
88 typedef typename WeakPointerToBase<T>::To To;
89PUBLISHED:
90 constexpr WeakConstPointerTo() noexcept = default;
91 INLINE WeakConstPointerTo(const To *ptr);
92 INLINE WeakConstPointerTo(const PointerTo<T> &copy);
93 INLINE WeakConstPointerTo(const ConstPointerTo<T> &copy);
94 INLINE WeakConstPointerTo(const WeakPointerTo<T> &copy);
95 INLINE WeakConstPointerTo(const WeakConstPointerTo<T> &copy);
96
97 public:
98 INLINE WeakConstPointerTo(WeakPointerTo<T> &&from) noexcept;
99 INLINE WeakConstPointerTo(WeakConstPointerTo<T> &&from) noexcept;
100
101 template<class Y>
102 ALWAYS_INLINE WeakConstPointerTo(const WeakPointerTo<Y> &r) noexcept;
103 template<class Y>
104 ALWAYS_INLINE WeakConstPointerTo(const WeakConstPointerTo<Y> &r) noexcept;
105 template<class Y>
106 ALWAYS_INLINE WeakConstPointerTo(const PointerTo<Y> &r) noexcept;
107 template<class Y>
108 ALWAYS_INLINE WeakConstPointerTo(const ConstPointerTo<Y> &r) noexcept;
109 template<class Y>
110 ALWAYS_INLINE WeakConstPointerTo(WeakPointerTo<Y> &&r) noexcept;
111 template<class Y>
112 ALWAYS_INLINE WeakConstPointerTo(WeakConstPointerTo<Y> &&r) noexcept;
113
114 INLINE const To &operator *() const;
115 INLINE const To *operator -> () const;
116 INLINE explicit operator const T *() const;
117
118PUBLISHED:
119 INLINE ConstPointerTo<T> lock() const;
120 INLINE const To *p() const;
121 INLINE const To *get_orig() const;
122
123 INLINE WeakConstPointerTo<T> &operator = (const To *ptr);
124 INLINE WeakConstPointerTo<T> &operator = (const PointerTo<T> &copy);
125 INLINE WeakConstPointerTo<T> &operator = (const ConstPointerTo<T> &copy);
126 INLINE WeakConstPointerTo<T> &operator = (const WeakPointerTo<T> &copy);
127 INLINE WeakConstPointerTo<T> &operator = (const WeakConstPointerTo<T> &copy);
128
129 public:
130 INLINE WeakConstPointerTo<T> &operator = (WeakPointerTo<T> &&from) noexcept;
131 INLINE WeakConstPointerTo<T> &operator = (WeakConstPointerTo<T> &&from) noexcept;
132
133 template<class Y>
134 ALWAYS_INLINE WeakConstPointerTo<T> &operator = (const WeakPointerTo<Y> &r) noexcept;
135 template<class Y>
136 ALWAYS_INLINE WeakConstPointerTo<T> &operator = (const WeakConstPointerTo<Y> &r) noexcept;
137 template<class Y>
138 ALWAYS_INLINE WeakConstPointerTo<T> &operator = (const PointerTo<Y> &r) noexcept;
139 template<class Y>
140 ALWAYS_INLINE WeakConstPointerTo<T> &operator = (const ConstPointerTo<Y> &r) noexcept;
141 template<class Y>
142 ALWAYS_INLINE WeakConstPointerTo<T> &operator = (WeakPointerTo<Y> &&r) noexcept;
143 template<class Y>
144 ALWAYS_INLINE WeakConstPointerTo<T> &operator = (WeakConstPointerTo<Y> &&r) noexcept;
145
146PUBLISHED:
147 // These functions normally wouldn't need to be redefined here, but we do so
148 // anyway just to help out interrogate (which doesn't seem to want to
149 // automatically export the WeakPointerToBase class). When this works again
150 // in interrogate, we can remove these.
151 INLINE bool is_null() const { return WeakPointerToBase<T>::is_null(); }
152 INLINE void clear() { WeakPointerToBase<T>::clear(); }
153};
154
155// Provide specializations of std::owner_less, for using a WPT as a map key.
156 namespace std {
157 template<class T>
158 struct owner_less<WeakPointerTo<T> > {
159 bool operator () (const WeakPointerTo<T> &lhs,
160 const WeakPointerTo<T> &rhs) const noexcept {
161 return lhs.owner_before(rhs);
162 }
163 };
164
165 template<class T>
166 struct owner_less<WeakConstPointerTo<T> > {
167 bool operator () (const WeakConstPointerTo<T> &lhs,
168 const WeakConstPointerTo<T> &rhs) const noexcept {
169 return lhs.owner_before(rhs);
170 }
171 };
172}
173
174#define WPT(type) WeakPointerTo< type >
175#define WCPT(type) WeakConstPointerTo< type >
176
177#include "weakPointerTo.I"
178
179#endif
ConstPointerTo
A ConstPointerTo is similar to a PointerTo, except it keeps a const pointer to the thing.
Definition pointerTo.h:144
PointerToVoid::is_null
constexpr bool is_null() const
Returns true if the PointerTo is a NULL pointer, false otherwise.
Definition pointerToVoid.I:27
PointerTo
This file defines the classes PointerTo and ConstPointerTo (and their abbreviations,...
Definition pointerTo.h:69
WeakConstPointerTo
A WeakConstPointerTo is similar to a WeakPointerTo, except it keeps a const pointer to the thing,...
Definition weakPointerTo.h:86
WeakConstPointerTo::p
const To * p() const
Returns an ordinary pointer instead of a WeakConstPointerTo.
Definition weakPointerTo.I:422
WeakConstPointerTo::lock
ConstPointerTo< T > lock() const
A thread-safe way to access the underlying pointer; will silently return null if the underlying point...
Definition weakPointerTo.I:410
WeakConstPointerTo::get_orig
const To * get_orig() const
Returns the original pointer value, even if the object has since been deleted.
Definition weakPointerTo.I:433
WeakPointerToBase::clear
void clear()
A convenient way to set the PointerTo object to NULL.
Definition weakPointerToBase.I:623
WeakPointerToBase::owner_before
bool owner_before(const WeakPointerToBase< Y > &other) const noexcept
Defines an ordering that is guaranteed to remain consistent even after the weak pointers have expired...
Definition weakPointerToBase.I:597
WeakPointerTo
WeakPointerTo is similar to PointerTo, except that it does not actually prevent the referenced pointe...
Definition weakPointerTo.h:29
WeakPointerTo::p
To * p() const
Returns an ordinary pointer instead of a WeakPointerTo.
Definition weakPointerTo.I:141
WeakPointerTo::lock
PointerTo< T > lock() const
A thread-safe way to access the underlying pointer; will silently return null if the underlying point...
Definition weakPointerTo.I:129
WeakPointerTo::get_orig
To * get_orig() const
Returns the original pointer value, even if the object has since been deleted.
Definition weakPointerTo.I:152
std
STL namespace.
pandabase.h
PANDA 3D SOFTWARE Copyright (c) Carnegie Mellon University.
pointerTo.h
PANDA 3D SOFTWARE Copyright (c) Carnegie Mellon University.
weakPointerToBase.h
PANDA 3D SOFTWARE Copyright (c) Carnegie Mellon University.
weakPointerTo.I
PANDA 3D SOFTWARE Copyright (c) Carnegie Mellon University.