File: nan_persistent_pre_12_inl.h

package info (click to toggle)
node-nan 2.4.0-2
  • links: PTS, VCS
  • area: main
  • in suites: stretch
  • size: 1,212 kB
  • ctags: 1,658
  • sloc: cpp: 6,307; python: 3,105; ansic: 1,314; makefile: 104; sh: 33
file content (242 lines) | stat: -rw-r--r-- 6,070 bytes parent folder | download
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
/*********************************************************************
 * NAN - Native Abstractions for Node.js
 *
 * Copyright (c) 2016 NAN contributors
 *
 * MIT License <https://github.com/nodejs/nan/blob/master/LICENSE.md>
 ********************************************************************/

#ifndef NAN_PERSISTENT_PRE_12_INL_H_
#define NAN_PERSISTENT_PRE_12_INL_H_

template<typename T>
class PersistentBase {
  v8::Persistent<T> persistent;
  template<typename U>
  friend v8::Local<U> New(const PersistentBase<U> &p);
  template<typename U, typename M>
  friend v8::Local<U> New(const Persistent<U, M> &p);
  template<typename U>
  friend v8::Local<U> New(const Global<U> &p);
  template<typename S> friend class ReturnValue;

 public:
  inline PersistentBase() :
      persistent() {}

  inline void Reset() {
    persistent.Dispose();
    persistent.Clear();
  }

  template<typename S>
  inline void Reset(const v8::Local<S> &other) {
    TYPE_CHECK(T, S);

    if (!persistent.IsEmpty()) {
      persistent.Dispose();
    }

    if (other.IsEmpty()) {
      persistent.Clear();
    } else {
      persistent = v8::Persistent<T>::New(other);
    }
  }

  template<typename S>
  inline void Reset(const PersistentBase<S> &other) {
    TYPE_CHECK(T, S);

    if (!persistent.IsEmpty()) {
      persistent.Dispose();
    }

    if (other.IsEmpty()) {
      persistent.Clear();
    } else {
      persistent = v8::Persistent<T>::New(other.persistent);
    }
  }

  inline bool IsEmpty() const { return persistent.IsEmpty(); }

  inline void Empty() { persistent.Clear(); }

  template<typename S>
  inline bool operator==(const PersistentBase<S> &that) const {
    return this->persistent == that.persistent;
  }

  template<typename S>
  inline bool operator==(const v8::Local<S> &that) const {
    return this->persistent == that;
  }

  template<typename S>
  inline bool operator!=(const PersistentBase<S> &that) const {
    return !operator==(that);
  }

  template<typename S>
  inline bool operator!=(const v8::Local<S> &that) const {
    return !operator==(that);
  }

  template<typename P>
  inline void SetWeak(
    P *parameter
    , typename WeakCallbackInfo<P>::Callback callback
    , WeakCallbackType type);

  inline void ClearWeak() { persistent.ClearWeak(); }

  inline void MarkIndependent() { persistent.MarkIndependent(); }

  inline bool IsIndependent() const { return persistent.IsIndependent(); }

  inline bool IsNearDeath() const { return persistent.IsNearDeath(); }

  inline bool IsWeak() const { return persistent.IsWeak(); }

 private:
  inline explicit PersistentBase(v8::Persistent<T> that) :
      persistent(that) { }
  inline explicit PersistentBase(T *val) : persistent(val) {}
  template<typename S, typename M> friend class Persistent;
  template<typename S> friend class Global;
  friend class ObjectWrap;
};

template<typename T>
class NonCopyablePersistentTraits {
 public:
  typedef Persistent<T, NonCopyablePersistentTraits<T> >
      NonCopyablePersistent;
  static const bool kResetInDestructor = false;
  template<typename S, typename M>
  inline static void Copy(const Persistent<S, M> &source,
                             NonCopyablePersistent *dest) {
    Uncompilable<v8::Object>();
  }

  template<typename O> inline static void Uncompilable() {
    TYPE_CHECK(O, v8::Primitive);
  }
};

template<typename T>
struct CopyablePersistentTraits {
  typedef Persistent<T, CopyablePersistentTraits<T> > CopyablePersistent;
  static const bool kResetInDestructor = true;
  template<typename S, typename M>
  static inline void Copy(const Persistent<S, M> &source,
                             CopyablePersistent *dest) {}
};

template<typename T, typename M> class Persistent :
    public PersistentBase<T> {
 public:
  inline Persistent() {}

  template<typename S> inline Persistent(v8::Handle<S> that)
      : PersistentBase<T>(v8::Persistent<T>::New(that)) {
    TYPE_CHECK(T, S);
  }

  inline Persistent(const Persistent &that) : PersistentBase<T>() {
    Copy(that);
  }

  template<typename S, typename M2>
  inline Persistent(const Persistent<S, M2> &that) :
      PersistentBase<T>() {
    Copy(that);
  }

  inline Persistent &operator=(const Persistent &that) {
    Copy(that);
    return *this;
  }

  template <class S, class M2>
  inline Persistent &operator=(const Persistent<S, M2> &that) {
    Copy(that);
    return *this;
  }

  inline ~Persistent() {
    if (M::kResetInDestructor) this->Reset();
  }

 private:
  inline T *operator*() const { return *PersistentBase<T>::persistent; }

  template<typename S, typename M2>
  inline void Copy(const Persistent<S, M2> &that) {
    TYPE_CHECK(T, S);

    this->Reset();

    if (!that.IsEmpty()) {
      this->persistent = v8::Persistent<T>::New(that.persistent);
      M::Copy(that, this);
    }
  }
};

template<typename T>
class Global : public PersistentBase<T> {
  struct RValue {
    inline explicit RValue(Global* obj) : object(obj) {}
    Global* object;
  };

 public:
  inline Global() : PersistentBase<T>(0) { }

  template <typename S>
  inline Global(v8::Local<S> that)
      : PersistentBase<T>(v8::Persistent<T>::New(that)) {
    TYPE_CHECK(T, S);
  }

  template <typename S>
  inline Global(const PersistentBase<S> &that)
    : PersistentBase<T>(that) {
    TYPE_CHECK(T, S);
  }
  /**
   * Move constructor.
   */
  inline Global(RValue rvalue)
    : PersistentBase<T>(rvalue.object->persistent) {
    rvalue.object->Reset();
  }
  inline ~Global() { this->Reset(); }
  /**
   * Move via assignment.
   */
  template<typename S>
  inline Global &operator=(Global<S> rhs) {
    TYPE_CHECK(T, S);
    this->Reset(rhs.persistent);
    rhs.Reset();
    return *this;
  }
  /**
   * Cast operator for moves.
   */
  inline operator RValue() { return RValue(this); }
  /**
   * Pass allows returning uniques from functions, etc.
   */
  Global Pass() { return Global(RValue(this)); }

 private:
  Global(Global &);
  void operator=(Global &);
  template<typename S> friend class ReturnValue;
};

#endif  // NAN_PERSISTENT_PRE_12_INL_H_