summaryrefslogtreecommitdiffstats
path: root/xpcom/base/nsCOMPtr.h
blob: d45209d5aa23792d4f3aaf5dc891558e9759590a (plain)
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
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
879
880
881
882
883
884
885
886
887
888
889
890
891
892
893
894
895
896
897
898
899
900
901
902
903
904
905
906
907
908
909
910
911
912
913
914
915
916
917
918
919
920
921
922
923
924
925
926
927
928
929
930
931
932
933
934
935
936
937
938
939
940
941
942
943
944
945
946
947
948
949
950
951
952
953
954
955
956
957
958
959
960
961
962
963
964
965
966
967
968
969
970
971
972
973
974
975
976
977
978
979
980
981
982
983
984
985
986
987
988
989
990
991
992
993
994
995
996
997
998
999
1000
1001
1002
1003
1004
1005
1006
1007
1008
1009
1010
1011
1012
1013
1014
1015
1016
1017
1018
1019
1020
1021
1022
1023
1024
1025
1026
1027
1028
1029
1030
1031
1032
1033
1034
1035
1036
1037
1038
1039
1040
1041
1042
1043
1044
1045
1046
1047
1048
1049
1050
1051
1052
1053
1054
1055
1056
1057
1058
1059
1060
1061
1062
1063
1064
1065
1066
1067
1068
1069
1070
1071
1072
1073
1074
1075
1076
1077
1078
1079
1080
1081
1082
1083
1084
1085
1086
1087
1088
1089
1090
1091
1092
1093
1094
1095
1096
1097
1098
1099
1100
1101
1102
1103
1104
1105
1106
1107
1108
1109
1110
1111
1112
1113
1114
1115
1116
1117
1118
1119
1120
1121
1122
1123
1124
1125
1126
1127
1128
1129
1130
1131
1132
1133
1134
1135
1136
1137
1138
1139
1140
1141
1142
1143
1144
1145
1146
1147
1148
1149
1150
1151
1152
1153
1154
1155
1156
1157
1158
1159
1160
1161
1162
1163
1164
1165
1166
1167
1168
1169
1170
1171
1172
1173
1174
/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* vim: set ts=8 sts=2 et sw=2 tw=80: */
/* This Source Code Form is subject to the terms of the Mozilla Public
 * License, v. 2.0. If a copy of the MPL was not distributed with this
 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */

#ifndef nsCOMPtr_h___
#define nsCOMPtr_h___

/*
 * Having problems?
 *
 * See the documentation at:
 *   https://firefox-source-docs.mozilla.org/xpcom/refptr.html
 *
 *
 * nsCOMPtr
 *   better than a raw pointer
 * for owning objects
 *                      -- scc
 */

#include <type_traits>

#include "mozilla/AlreadyAddRefed.h"
#include "mozilla/Assertions.h"
#include "mozilla/Attributes.h"
#include "mozilla/RefPtr.h"
#include "nsCycleCollectionNoteChild.h"
#include "nsDebug.h"  // for |NS_ASSERTION|
#include "nsISupportsUtils.h"  // for |nsresult|, |NS_ADDREF|, |NS_GET_TEMPLATE_IID| et al

/*
 * WARNING: This file defines several macros for internal use only. These
 * macros begin with the prefix |NSCAP_|. Do not use these macros in your own
 * code. They are for internal use only for cross-platform compatibility, and
 * are subject to change without notice.
 */

#ifdef _MSC_VER
// Under VC++, we win by inlining StartAssignment.
#  define NSCAP_FEATURE_INLINE_STARTASSIGNMENT

// Also under VC++, at the highest warning level, we are overwhelmed with
// warnings about (unused) inline functions being removed. This is to be
// expected with templates, so we disable the warning.
#  pragma warning(disable : 4514)
#endif

#ifdef DEBUG
#  define NSCAP_FEATURE_TEST_DONTQUERY_CASES
#endif

#ifdef __GNUC__
// Our use of nsCOMPtr_base::mRawPtr violates the C++ standard's aliasing
// rules. Mark it with the may_alias attribute so that gcc 3.3 and higher
// don't reorder instructions based on aliasing assumptions for
// this variable.  Fortunately, gcc versions < 3.3 do not do any
// optimizations that break nsCOMPtr.

#  define NS_MAY_ALIAS_PTR(t) t* __attribute__((__may_alias__))
#else
#  define NS_MAY_ALIAS_PTR(t) t*
#endif

/*
 * The following three macros (NSCAP_ADDREF, NSCAP_RELEASE, and
 * NSCAP_LOG_ASSIGNMENT) allow external clients the ability to add logging or
 * other interesting debug facilities. In fact, if you want |nsCOMPtr| to
 * participate in the standard logging facility, you provide
 * (e.g., in "nsISupportsImpl.h") suitable definitions
 *
 *   #define NSCAP_ADDREF(this, ptr)         NS_ADDREF(ptr)
 *   #define NSCAP_RELEASE(this, ptr)        NS_RELEASE(ptr)
 */

#ifndef NSCAP_ADDREF
#  define NSCAP_ADDREF(this, ptr) \
    mozilla::RefPtrTraits<        \
        typename std::remove_reference<decltype(*ptr)>::type>::AddRef(ptr)
#endif

#ifndef NSCAP_RELEASE
#  define NSCAP_RELEASE(this, ptr) \
    mozilla::RefPtrTraits<         \
        typename std::remove_reference<decltype(*ptr)>::type>::Release(ptr)
#endif

// Clients can define |NSCAP_LOG_ASSIGNMENT| to perform logging.
#ifdef NSCAP_LOG_ASSIGNMENT
// Remember that |NSCAP_LOG_ASSIGNMENT| was defined by some client so that we
// know to instantiate |~nsGetterAddRefs| in turn to note the external
// assignment into the |nsCOMPtr|.
#  define NSCAP_LOG_EXTERNAL_ASSIGNMENT
#else
// ...otherwise, just strip it out of the code
#  define NSCAP_LOG_ASSIGNMENT(this, ptr)
#endif

#ifndef NSCAP_LOG_RELEASE
#  define NSCAP_LOG_RELEASE(this, ptr)
#endif

namespace mozilla {
template <class T>
class OwningNonNull;
}  // namespace mozilla

template <class T>
inline already_AddRefed<T> dont_AddRef(T* aRawPtr) {
  return already_AddRefed<T>(aRawPtr);
}

template <class T>
inline already_AddRefed<T>&& dont_AddRef(
    already_AddRefed<T>&& aAlreadyAddRefedPtr) {
  return std::move(aAlreadyAddRefedPtr);
}

/*
 * An nsCOMPtr_helper transforms commonly called getters into typesafe forms
 * that are more convenient to call, and more efficient to use with |nsCOMPtr|s.
 * Good candidates for helpers are |QueryInterface()|, |CreateInstance()|, etc.
 *
 * Here are the rules for a helper:
 *   - it implements |operator()| to produce an interface pointer
 *   - (except for its name) |operator()| is a valid [XP]COM `getter'
 *   - the interface pointer that it returns is already |AddRef()|ed (as from
 *     any good getter)
 *   - it matches the type requested with the supplied |nsIID| argument
 *   - its constructor provides an optional |nsresult*| that |operator()| can
 *     fill in with an error when it is executed
 *
 * See |class nsGetInterface| for an example.
 */
class MOZ_STACK_CLASS nsCOMPtr_helper {
 public:
  virtual nsresult NS_FASTCALL operator()(const nsIID&, void**) const = 0;
};

/*
 * nsQueryInterface could have been implemented as an nsCOMPtr_helper to avoid
 * adding specialized machinery in nsCOMPtr, but do_QueryInterface is called
 * often enough that the codesize savings are big enough to warrant the
 * specialcasing.
 */
class MOZ_STACK_CLASS nsQueryInterfaceISupports {
 public:
  explicit nsQueryInterfaceISupports(nsISupports* aRawPtr) : mRawPtr(aRawPtr) {}

  nsresult NS_FASTCALL operator()(const nsIID& aIID, void**) const;

 private:
  nsISupports* MOZ_OWNING_REF mRawPtr;
};

template <typename T>
class MOZ_STACK_CLASS nsQueryInterface final
    : public nsQueryInterfaceISupports {
 public:
  explicit nsQueryInterface(T* aRawPtr)
      : nsQueryInterfaceISupports(ToSupports(aRawPtr)) {}

  nsresult NS_FASTCALL operator()(const nsIID& aIID, void** aAnswer) const {
    return nsQueryInterfaceISupports::operator()(aIID, aAnswer);
  }
};

class MOZ_STACK_CLASS nsQueryInterfaceISupportsWithError {
 public:
  nsQueryInterfaceISupportsWithError(nsISupports* aRawPtr, nsresult* aError)
      : mRawPtr(aRawPtr), mErrorPtr(aError) {}

  nsresult NS_FASTCALL operator()(const nsIID& aIID, void**) const;

 private:
  nsISupports* MOZ_OWNING_REF mRawPtr;
  nsresult* mErrorPtr;
};

template <typename T>
class MOZ_STACK_CLASS nsQueryInterfaceWithError final
    : public nsQueryInterfaceISupportsWithError {
 public:
  explicit nsQueryInterfaceWithError(T* aRawPtr, nsresult* aError)
      : nsQueryInterfaceISupportsWithError(ToSupports(aRawPtr), aError) {}

  nsresult NS_FASTCALL operator()(const nsIID& aIID, void** aAnswer) const {
    return nsQueryInterfaceISupportsWithError::operator()(aIID, aAnswer);
  }
};

namespace mozilla {
// PointedToType<> is needed so that do_QueryInterface() will work with a
// variety of smart pointer types in addition to raw pointers. These types
// include RefPtr<>, nsCOMPtr<>, and OwningNonNull<>.
template <class T>
using PointedToType = std::remove_pointer_t<decltype(&*std::declval<T>())>;
}  // namespace mozilla

template <class T>
inline nsQueryInterface<mozilla::PointedToType<T>> do_QueryInterface(T aPtr) {
  return nsQueryInterface<mozilla::PointedToType<T>>(aPtr);
}

template <class T>
inline nsQueryInterfaceWithError<mozilla::PointedToType<T>> do_QueryInterface(
    T aRawPtr, nsresult* aError) {
  return nsQueryInterfaceWithError<mozilla::PointedToType<T>>(aRawPtr, aError);
}

template <class T>
inline void do_QueryInterface(already_AddRefed<T>&) {
  // This signature exists solely to _stop_ you from doing the bad thing.
  // Saying |do_QueryInterface()| on a pointer that is not otherwise owned by
  // someone else is an automatic leak. See bug 8221.
}

template <class T>
inline void do_QueryInterface(already_AddRefed<T>&, nsresult*) {
  // This signature exists solely to _stop_ you from doing the bad thing.
  // Saying |do_QueryInterface()| on a pointer that is not otherwise owned by
  // someone else is an automatic leak. See bug 8221.
}

////////////////////////////////////////////////////////////////////////////
// Using servicemanager with COMPtrs
class nsGetServiceByCID final {
 public:
  explicit nsGetServiceByCID(const nsCID& aCID) : mCID(aCID) {}

  nsresult NS_FASTCALL operator()(const nsIID&, void**) const;

 private:
  const nsCID& mCID;
};

class nsGetServiceByCIDWithError final {
 public:
  nsGetServiceByCIDWithError(const nsCID& aCID, nsresult* aErrorPtr)
      : mCID(aCID), mErrorPtr(aErrorPtr) {}

  nsresult NS_FASTCALL operator()(const nsIID&, void**) const;

 private:
  const nsCID& mCID;
  nsresult* mErrorPtr;
};

class nsGetServiceByContractID final {
 public:
  explicit nsGetServiceByContractID(const char* aContractID)
      : mContractID(aContractID) {}

  nsresult NS_FASTCALL operator()(const nsIID&, void**) const;

 private:
  const char* mContractID;
};

class nsGetServiceByContractIDWithError final {
 public:
  nsGetServiceByContractIDWithError(const char* aContractID,
                                    nsresult* aErrorPtr)
      : mContractID(aContractID), mErrorPtr(aErrorPtr) {}

  nsresult NS_FASTCALL operator()(const nsIID&, void**) const;

 private:
  const char* mContractID;
  nsresult* mErrorPtr;
};

class nsIWeakReference;

// Weak references
class MOZ_STACK_CLASS nsQueryReferent final {
 public:
  nsQueryReferent(nsIWeakReference* aWeakPtr, nsresult* aError)
      : mWeakPtr(aWeakPtr), mErrorPtr(aError) {}

  nsresult NS_FASTCALL operator()(const nsIID& aIID, void**) const;

 private:
  nsIWeakReference* MOZ_NON_OWNING_REF mWeakPtr;
  nsresult* mErrorPtr;
};

// template<class T> class nsGetterAddRefs;

// Helper for assert_validity method
template <class T>
char (&TestForIID(decltype(&NS_GET_TEMPLATE_IID(T))))[2];
template <class T>
char TestForIID(...);

template <class T>
class MOZ_IS_REFPTR nsCOMPtr final {
 private:
  void assign_with_AddRef(T*);
  template <typename U>
  void assign_from_qi(const nsQueryInterface<U>, const nsIID&);
  template <typename U>
  void assign_from_qi_with_error(const nsQueryInterfaceWithError<U>&,
                                 const nsIID&);
  void assign_from_gs_cid(const nsGetServiceByCID, const nsIID&);
  void assign_from_gs_cid_with_error(const nsGetServiceByCIDWithError&,
                                     const nsIID&);
  void assign_from_gs_contractid(const nsGetServiceByContractID, const nsIID&);
  void assign_from_gs_contractid_with_error(
      const nsGetServiceByContractIDWithError&, const nsIID&);
  void assign_from_query_referent(const nsQueryReferent&, const nsIID&);
  void assign_from_helper(const nsCOMPtr_helper&, const nsIID&);
  void** begin_assignment();

  void assign_assuming_AddRef(T* aNewPtr) {
    T* oldPtr = mRawPtr;
    mRawPtr = aNewPtr;
    NSCAP_LOG_ASSIGNMENT(this, aNewPtr);
    NSCAP_LOG_RELEASE(this, oldPtr);
    if (oldPtr) {
      NSCAP_RELEASE(this, oldPtr);
    }
  }

 private:
  T* MOZ_OWNING_REF mRawPtr;

  void assert_validity() {
    static_assert(1 < sizeof(TestForIID<T>(nullptr)),
                  "nsCOMPtr only works "
                  "for types with IIDs.  Either use RefPtr; add an IID to "
                  "your type with NS_DECLARE_STATIC_IID_ACCESSOR/"
                  "NS_DEFINE_STATIC_IID_ACCESSOR; or make the nsCOMPtr point "
                  "to a base class with an IID.");
  }

 public:
  typedef T element_type;

  ~nsCOMPtr() {
    NSCAP_LOG_RELEASE(this, mRawPtr);
    if (mRawPtr) {
      NSCAP_RELEASE(this, mRawPtr);
    }
  }

#ifdef NSCAP_FEATURE_TEST_DONTQUERY_CASES
  void Assert_NoQueryNeeded() {
    if (!mRawPtr) {
      return;
    }
    if constexpr (std::is_same_v<T, nsISupports>) {
      // FIXME: nsCOMPtr<nsISupports> never asserted this, and it currently
      // fails...
      return;
    }
    // This can't be defined in terms of do_QueryInterface because
    // that bans casts from a class to itself.
    void* out = nullptr;
    mRawPtr->QueryInterface(NS_GET_TEMPLATE_IID(T), &out);
    T* query_result = static_cast<T*>(out);
    MOZ_ASSERT(query_result == mRawPtr, "QueryInterface needed");
    NS_RELEASE(query_result);
  }

#  define NSCAP_ASSERT_NO_QUERY_NEEDED() Assert_NoQueryNeeded();
#else
#  define NSCAP_ASSERT_NO_QUERY_NEEDED()
#endif

  // Constructors

  nsCOMPtr() : mRawPtr(nullptr) {
    assert_validity();
    NSCAP_LOG_ASSIGNMENT(this, nullptr);
  }

  MOZ_IMPLICIT nsCOMPtr(decltype(nullptr)) : mRawPtr(nullptr) {
    assert_validity();
    NSCAP_LOG_ASSIGNMENT(this, nullptr);
  }

  nsCOMPtr(const nsCOMPtr<T>& aSmartPtr) : mRawPtr(aSmartPtr.mRawPtr) {
    assert_validity();
    if (mRawPtr) {
      NSCAP_ADDREF(this, mRawPtr);
    }
    NSCAP_LOG_ASSIGNMENT(this, aSmartPtr.mRawPtr);
  }

  template <class U>
  MOZ_IMPLICIT nsCOMPtr(const nsCOMPtr<U>& aSmartPtr)
      : mRawPtr(aSmartPtr.get()) {
    // Make sure that U actually inherits from T
    static_assert(std::is_base_of<T, U>::value, "U should be a subclass of T");
    assert_validity();
    if (mRawPtr) {
      NSCAP_ADDREF(this, mRawPtr);
    }
    NSCAP_LOG_ASSIGNMENT(this, aSmartPtr.get());
  }

  nsCOMPtr(nsCOMPtr<T>&& aSmartPtr) : mRawPtr(aSmartPtr.mRawPtr) {
    assert_validity();
    aSmartPtr.mRawPtr = nullptr;
    NSCAP_LOG_ASSIGNMENT(this, mRawPtr);
  }

  template <class U>
  MOZ_IMPLICIT nsCOMPtr(nsCOMPtr<U>&& aSmartPtr)
      : mRawPtr(aSmartPtr.forget().template downcast<T>().take()) {
    // Make sure that U actually inherits from T
    static_assert(std::is_base_of<T, U>::value, "U should be a subclass of T");
    assert_validity();
    NSCAP_LOG_ASSIGNMENT(this, mRawPtr);
    NSCAP_ASSERT_NO_QUERY_NEEDED();
  }

  MOZ_IMPLICIT nsCOMPtr(T* aRawPtr) : mRawPtr(aRawPtr) {
    assert_validity();
    if (mRawPtr) {
      NSCAP_ADDREF(this, mRawPtr);
    }
    NSCAP_LOG_ASSIGNMENT(this, aRawPtr);
    NSCAP_ASSERT_NO_QUERY_NEEDED();
  }

  MOZ_IMPLICIT nsCOMPtr(already_AddRefed<T>& aSmartPtr)
      : mRawPtr(aSmartPtr.take()) {
    assert_validity();
    NSCAP_LOG_ASSIGNMENT(this, mRawPtr);
    NSCAP_ASSERT_NO_QUERY_NEEDED();
  }

  // Construct from |otherComPtr.forget()|.
  MOZ_IMPLICIT nsCOMPtr(already_AddRefed<T>&& aSmartPtr)
      : mRawPtr(aSmartPtr.take()) {
    assert_validity();
    NSCAP_LOG_ASSIGNMENT(this, mRawPtr);
    NSCAP_ASSERT_NO_QUERY_NEEDED();
  }

  // Construct from |std::move(otherRefPtr)|.
  template <typename U>
  MOZ_IMPLICIT nsCOMPtr(RefPtr<U>&& aSmartPtr)
      : mRawPtr(static_cast<already_AddRefed<T>>(aSmartPtr.forget()).take()) {
    assert_validity();
    // Make sure that U actually inherits from T
    static_assert(std::is_base_of<T, U>::value, "U is not a subclass of T");
    NSCAP_LOG_ASSIGNMENT(this, mRawPtr);
    NSCAP_ASSERT_NO_QUERY_NEEDED();
  }

  // Construct from |already_AddRefed|.
  template <typename U>
  MOZ_IMPLICIT nsCOMPtr(already_AddRefed<U>& aSmartPtr)
      : mRawPtr(static_cast<T*>(aSmartPtr.take())) {
    assert_validity();
    // But make sure that U actually inherits from T.
    static_assert(std::is_base_of<T, U>::value, "U is not a subclass of T");
    NSCAP_LOG_ASSIGNMENT(this, static_cast<T*>(mRawPtr));
    NSCAP_ASSERT_NO_QUERY_NEEDED();
  }

  // Construct from |otherComPtr.forget()|.
  template <typename U>
  MOZ_IMPLICIT nsCOMPtr(already_AddRefed<U>&& aSmartPtr)
      : mRawPtr(static_cast<T*>(aSmartPtr.take())) {
    assert_validity();
    // But make sure that U actually inherits from T.
    static_assert(std::is_base_of<T, U>::value, "U is not a subclass of T");
    NSCAP_LOG_ASSIGNMENT(this, static_cast<T*>(mRawPtr));
    NSCAP_ASSERT_NO_QUERY_NEEDED();
  }

  // Construct from |do_QueryInterface(expr)|.
  template <typename U>
  MOZ_IMPLICIT nsCOMPtr(const nsQueryInterface<U> aQI) : mRawPtr(nullptr) {
    assert_validity();
    NSCAP_LOG_ASSIGNMENT(this, nullptr);
    assign_from_qi(aQI, NS_GET_TEMPLATE_IID(T));
  }

  // Construct from |do_QueryInterface(expr, &rv)|.
  template <typename U>
  MOZ_IMPLICIT nsCOMPtr(const nsQueryInterfaceWithError<U>& aQI)
      : mRawPtr(nullptr) {
    assert_validity();
    NSCAP_LOG_ASSIGNMENT(this, nullptr);
    assign_from_qi_with_error(aQI, NS_GET_TEMPLATE_IID(T));
  }

  // Construct from |do_GetService(cid_expr)|.
  MOZ_IMPLICIT nsCOMPtr(const nsGetServiceByCID aGS) : mRawPtr(nullptr) {
    assert_validity();
    NSCAP_LOG_ASSIGNMENT(this, nullptr);
    assign_from_gs_cid(aGS, NS_GET_TEMPLATE_IID(T));
  }

  // Construct from |do_GetService(cid_expr, &rv)|.
  MOZ_IMPLICIT nsCOMPtr(const nsGetServiceByCIDWithError& aGS)
      : mRawPtr(nullptr) {
    assert_validity();
    NSCAP_LOG_ASSIGNMENT(this, nullptr);
    assign_from_gs_cid_with_error(aGS, NS_GET_TEMPLATE_IID(T));
  }

  // Construct from |do_GetService(contractid_expr)|.
  MOZ_IMPLICIT nsCOMPtr(const nsGetServiceByContractID aGS) : mRawPtr(nullptr) {
    assert_validity();
    NSCAP_LOG_ASSIGNMENT(this, nullptr);
    assign_from_gs_contractid(aGS, NS_GET_TEMPLATE_IID(T));
  }

  // Construct from |do_GetService(contractid_expr, &rv)|.
  MOZ_IMPLICIT nsCOMPtr(const nsGetServiceByContractIDWithError& aGS)
      : mRawPtr(nullptr) {
    assert_validity();
    NSCAP_LOG_ASSIGNMENT(this, nullptr);
    assign_from_gs_contractid_with_error(aGS, NS_GET_TEMPLATE_IID(T));
  }

  // Construct from |do_QueryReferent(ptr)|
  MOZ_IMPLICIT nsCOMPtr(const nsQueryReferent& aQueryReferent)
      : mRawPtr(nullptr) {
    assert_validity();
    NSCAP_LOG_ASSIGNMENT(this, nullptr);
    assign_from_query_referent(aQueryReferent, NS_GET_TEMPLATE_IID(T));
  }

  // And finally, anything else we might need to construct from can exploit the
  // nsCOMPtr_helper facility.
  MOZ_IMPLICIT nsCOMPtr(const nsCOMPtr_helper& aHelper) : mRawPtr(nullptr) {
    assert_validity();
    NSCAP_LOG_ASSIGNMENT(this, nullptr);
    assign_from_helper(aHelper, NS_GET_TEMPLATE_IID(T));
    NSCAP_ASSERT_NO_QUERY_NEEDED();
  }

  // construct from |mozilla::NotNull|.
  template <typename I,
            typename = std::enable_if_t<!std::is_same_v<I, nsCOMPtr<T>> &&
                                        std::is_convertible_v<I, nsCOMPtr<T>>>>
  MOZ_IMPLICIT nsCOMPtr(const mozilla::NotNull<I>& aSmartPtr)
      : mRawPtr(nsCOMPtr<T>(aSmartPtr.get()).forget().take()) {}

  // construct from |mozilla::MovingNotNull|.
  template <typename I,
            typename = std::enable_if_t<!std::is_same_v<I, nsCOMPtr<T>> &&
                                        std::is_convertible_v<I, nsCOMPtr<T>>>>
  MOZ_IMPLICIT nsCOMPtr(mozilla::MovingNotNull<I>&& aSmartPtr)
      : mRawPtr(
            nsCOMPtr<T>(std::move(aSmartPtr).unwrapBasePtr()).forget().take()) {
  }

  // Defined in OwningNonNull.h
  template <class U>
  MOZ_IMPLICIT nsCOMPtr(const mozilla::OwningNonNull<U>& aOther);

  // Assignment operators

  nsCOMPtr<T>& operator=(const nsCOMPtr<T>& aRhs) {
    assign_with_AddRef(aRhs.mRawPtr);
    return *this;
  }

  template <class U>
  nsCOMPtr<T>& operator=(const nsCOMPtr<U>& aRhs) {
    // Make sure that U actually inherits from T
    static_assert(std::is_base_of<T, U>::value, "U should be a subclass of T");
    assign_with_AddRef(aRhs.get());
    return *this;
  }

  nsCOMPtr<T>& operator=(nsCOMPtr<T>&& aRhs) {
    assign_assuming_AddRef(aRhs.forget().take());
    return *this;
  }

  template <class U>
  nsCOMPtr<T>& operator=(nsCOMPtr<U>&& aRhs) {
    // Make sure that U actually inherits from T
    static_assert(std::is_base_of<T, U>::value, "U should be a subclass of T");
    assign_assuming_AddRef(aRhs.forget().template downcast<T>().take());
    NSCAP_ASSERT_NO_QUERY_NEEDED();
    return *this;
  }

  nsCOMPtr<T>& operator=(T* aRhs) {
    assign_with_AddRef(aRhs);
    NSCAP_ASSERT_NO_QUERY_NEEDED();
    return *this;
  }

  nsCOMPtr<T>& operator=(decltype(nullptr)) {
    assign_assuming_AddRef(nullptr);
    return *this;
  }

  // Assign from |already_AddRefed|.
  template <typename U>
  nsCOMPtr<T>& operator=(already_AddRefed<U>& aRhs) {
    // Make sure that U actually inherits from T
    static_assert(std::is_base_of<T, U>::value, "U is not a subclass of T");
    assign_assuming_AddRef(static_cast<T*>(aRhs.take()));
    NSCAP_ASSERT_NO_QUERY_NEEDED();
    return *this;
  }

  // Assign from |otherComPtr.forget()|.
  template <typename U>
  nsCOMPtr<T>& operator=(already_AddRefed<U>&& aRhs) {
    // Make sure that U actually inherits from T
    static_assert(std::is_base_of<T, U>::value, "U is not a subclass of T");
    assign_assuming_AddRef(static_cast<T*>(aRhs.take()));
    NSCAP_ASSERT_NO_QUERY_NEEDED();
    return *this;
  }

  // Assign from |std::move(otherRefPtr)|.
  template <typename U>
  nsCOMPtr<T>& operator=(RefPtr<U>&& aRhs) {
    // Make sure that U actually inherits from T
    static_assert(std::is_base_of<T, U>::value, "U is not a subclass of T");
    assign_assuming_AddRef(static_cast<T*>(aRhs.forget().take()));
    NSCAP_ASSERT_NO_QUERY_NEEDED();
    return *this;
  }

  // Assign from |do_QueryInterface(expr)|.
  template <typename U>
  nsCOMPtr<T>& operator=(const nsQueryInterface<U> aRhs) {
    assign_from_qi(aRhs, NS_GET_TEMPLATE_IID(T));
    return *this;
  }

  // Assign from |do_QueryInterface(expr, &rv)|.
  template <typename U>
  nsCOMPtr<T>& operator=(const nsQueryInterfaceWithError<U>& aRhs) {
    assign_from_qi_with_error(aRhs, NS_GET_TEMPLATE_IID(T));
    return *this;
  }

  // Assign from |do_GetService(cid_expr)|.
  nsCOMPtr<T>& operator=(const nsGetServiceByCID aRhs) {
    assign_from_gs_cid(aRhs, NS_GET_TEMPLATE_IID(T));
    return *this;
  }

  // Assign from |do_GetService(cid_expr, &rv)|.
  nsCOMPtr<T>& operator=(const nsGetServiceByCIDWithError& aRhs) {
    assign_from_gs_cid_with_error(aRhs, NS_GET_TEMPLATE_IID(T));
    return *this;
  }

  // Assign from |do_GetService(contractid_expr)|.
  nsCOMPtr<T>& operator=(const nsGetServiceByContractID aRhs) {
    assign_from_gs_contractid(aRhs, NS_GET_TEMPLATE_IID(T));
    return *this;
  }

  // Assign from |do_GetService(contractid_expr, &rv)|.
  nsCOMPtr<T>& operator=(const nsGetServiceByContractIDWithError& aRhs) {
    assign_from_gs_contractid_with_error(aRhs, NS_GET_TEMPLATE_IID(T));
    return *this;
  }

  // Assign from |do_QueryReferent(ptr)|.
  nsCOMPtr<T>& operator=(const nsQueryReferent& aRhs) {
    assign_from_query_referent(aRhs, NS_GET_TEMPLATE_IID(T));
    return *this;
  }

  // And finally, anything else we might need to assign from can exploit the
  // nsCOMPtr_helper facility.
  nsCOMPtr<T>& operator=(const nsCOMPtr_helper& aRhs) {
    assign_from_helper(aRhs, NS_GET_TEMPLATE_IID(T));
    NSCAP_ASSERT_NO_QUERY_NEEDED();
    return *this;
  }

  // Assign from |mozilla::NotNull|.
  template <typename I,
            typename = std::enable_if_t<std::is_convertible_v<I, nsCOMPtr<T>>>>
  nsCOMPtr<T>& operator=(const mozilla::NotNull<I>& aSmartPtr) {
    assign_assuming_AddRef(nsCOMPtr<T>(aSmartPtr.get()).forget().take());
    return *this;
  }

  // Assign from |mozilla::MovingNotNull|.
  template <typename I,
            typename = std::enable_if_t<std::is_convertible_v<I, nsCOMPtr<T>>>>
  nsCOMPtr<T>& operator=(mozilla::MovingNotNull<I>&& aSmartPtr) {
    assign_assuming_AddRef(
        nsCOMPtr<T>(std::move(aSmartPtr).unwrapBasePtr()).forget().take());
    return *this;
  }

  // Defined in OwningNonNull.h
  template <class U>
  nsCOMPtr<T>& operator=(const mozilla::OwningNonNull<U>& aOther);

  // Exchange ownership with |aRhs|; can save a pair of refcount operations.
  void swap(nsCOMPtr<T>& aRhs) {
    T* temp = aRhs.mRawPtr;
    NSCAP_LOG_ASSIGNMENT(&aRhs, mRawPtr);
    NSCAP_LOG_ASSIGNMENT(this, temp);
    NSCAP_LOG_RELEASE(this, mRawPtr);
    NSCAP_LOG_RELEASE(&aRhs, temp);
    aRhs.mRawPtr = mRawPtr;
    mRawPtr = temp;
    // |aRhs| maintains the same invariants, so we don't need to
    // |NSCAP_ASSERT_NO_QUERY_NEEDED|
  }

  // Exchange ownership with |aRhs|; can save a pair of refcount operations.
  void swap(T*& aRhs) {
    T* temp = aRhs;
    NSCAP_LOG_ASSIGNMENT(this, temp);
    NSCAP_LOG_RELEASE(this, mRawPtr);
    aRhs = reinterpret_cast<T*>(mRawPtr);
    mRawPtr = temp;
    NSCAP_ASSERT_NO_QUERY_NEEDED();
  }

  // Other pointer operators

  // Return the value of mRawPtr and null out mRawPtr. Useful for
  // already_AddRefed return values.
  already_AddRefed<T> MOZ_MAY_CALL_AFTER_MUST_RETURN forget() {
    T* temp = nullptr;
    swap(temp);
    return already_AddRefed<T>(temp);
  }

  // Set the target of aRhs to the value of mRawPtr and null out mRawPtr.
  // Useful to avoid unnecessary AddRef/Release pairs with "out" parameters
  // where aRhs bay be a T** or an I** where I is a base class of T.
  template <typename I>
  void forget(I** aRhs) {
    NS_ASSERTION(aRhs, "Null pointer passed to forget!");
    NSCAP_LOG_RELEASE(this, mRawPtr);
    *aRhs = get();
    mRawPtr = nullptr;
  }

  // Prefer the implicit conversion provided automatically by
  // |operator T*() const|. Use |get()| to resolve ambiguity or to get a
  // castable pointer.
  T* get() const { return reinterpret_cast<T*>(mRawPtr); }

  // Makes an nsCOMPtr act like its underlying raw pointer type whenever it is
  // used in a context where a raw pointer is expected. It is this operator
  // that makes an nsCOMPtr substitutable for a raw pointer.
  //
  // Prefer the implicit use of this operator to calling |get()|, except where
  // necessary to resolve ambiguity.
  operator T*() const& { return get(); }

  // Don't allow implicit conversion of temporary nsCOMPtr to raw pointer,
  // because the refcount might be one and the pointer will immediately become
  // invalid.
  operator T*() const&& = delete;

  // Needed to avoid the deleted operator above
  explicit operator bool() const { return !!mRawPtr; }

  T* operator->() const MOZ_NO_ADDREF_RELEASE_ON_RETURN {
    MOZ_ASSERT(mRawPtr != nullptr,
               "You can't dereference a NULL nsCOMPtr with operator->().");
    return get();
  }

  // These are not intended to be used by clients. See |address_of| below.
  nsCOMPtr<T>* get_address() { return this; }
  const nsCOMPtr<T>* get_address() const { return this; }

 public:
  T& operator*() const {
    MOZ_ASSERT(mRawPtr != nullptr,
               "You can't dereference a NULL nsCOMPtr with operator*().");
    return *get();
  }

  T** StartAssignment() {
#ifndef NSCAP_FEATURE_INLINE_STARTASSIGNMENT
    return reinterpret_cast<T**>(begin_assignment());
#else
    assign_assuming_AddRef(nullptr);
    return reinterpret_cast<T**>(&mRawPtr);
#endif
  }
};

template <typename T>
inline void ImplCycleCollectionUnlink(nsCOMPtr<T>& aField) {
  aField = nullptr;
}

template <typename T>
inline void ImplCycleCollectionTraverse(
    nsCycleCollectionTraversalCallback& aCallback, nsCOMPtr<T>& aField,
    const char* aName, uint32_t aFlags = 0) {
  CycleCollectionNoteChild(aCallback, aField.get(), aName, aFlags);
}

template <class T>
void nsCOMPtr<T>::assign_with_AddRef(T* aRawPtr) {
  if (aRawPtr) {
    NSCAP_ADDREF(this, aRawPtr);
  }
  assign_assuming_AddRef(aRawPtr);
}

template <class T>
template <typename U>
void nsCOMPtr<T>::assign_from_qi(const nsQueryInterface<U> aQI,
                                 const nsIID& aIID) {
  // Allow QIing to nsISupports from nsISupports as a special-case, since
  // SameCOMIdentity uses it.
  static_assert(
      std::is_same_v<T, nsISupports> ||
          !(std::is_same_v<T, U> || std::is_base_of<T, U>::value),
      "don't use do_QueryInterface for compile-time-determinable casts");
  void* newRawPtr;
  if (NS_FAILED(aQI(aIID, &newRawPtr))) {
    newRawPtr = nullptr;
  }
  assign_assuming_AddRef(static_cast<T*>(newRawPtr));
}

template <class T>
template <typename U>
void nsCOMPtr<T>::assign_from_qi_with_error(
    const nsQueryInterfaceWithError<U>& aQI, const nsIID& aIID) {
  static_assert(
      !(std::is_same_v<T, U> || std::is_base_of<T, U>::value),
      "don't use do_QueryInterface for compile-time-determinable casts");
  void* newRawPtr;
  if (NS_FAILED(aQI(aIID, &newRawPtr))) {
    newRawPtr = nullptr;
  }
  assign_assuming_AddRef(static_cast<T*>(newRawPtr));
}

template <class T>
void nsCOMPtr<T>::assign_from_gs_cid(const nsGetServiceByCID aGS,
                                     const nsIID& aIID) {
  void* newRawPtr;
  if (NS_FAILED(aGS(aIID, &newRawPtr))) {
    newRawPtr = nullptr;
  }
  assign_assuming_AddRef(static_cast<T*>(newRawPtr));
}

template <class T>
void nsCOMPtr<T>::assign_from_gs_cid_with_error(
    const nsGetServiceByCIDWithError& aGS, const nsIID& aIID) {
  void* newRawPtr;
  if (NS_FAILED(aGS(aIID, &newRawPtr))) {
    newRawPtr = nullptr;
  }
  assign_assuming_AddRef(static_cast<T*>(newRawPtr));
}

template <class T>
void nsCOMPtr<T>::assign_from_gs_contractid(const nsGetServiceByContractID aGS,
                                            const nsIID& aIID) {
  void* newRawPtr;
  if (NS_FAILED(aGS(aIID, &newRawPtr))) {
    newRawPtr = nullptr;
  }
  assign_assuming_AddRef(static_cast<T*>(newRawPtr));
}

template <class T>
void nsCOMPtr<T>::assign_from_gs_contractid_with_error(
    const nsGetServiceByContractIDWithError& aGS, const nsIID& aIID) {
  void* newRawPtr;
  if (NS_FAILED(aGS(aIID, &newRawPtr))) {
    newRawPtr = nullptr;
  }
  assign_assuming_AddRef(static_cast<T*>(newRawPtr));
}

template <class T>
void nsCOMPtr<T>::assign_from_query_referent(
    const nsQueryReferent& aQueryReferent, const nsIID& aIID) {
  void* newRawPtr;
  if (NS_FAILED(aQueryReferent(aIID, &newRawPtr))) {
    newRawPtr = nullptr;
  }
  assign_assuming_AddRef(static_cast<T*>(newRawPtr));
}

template <class T>
void nsCOMPtr<T>::assign_from_helper(const nsCOMPtr_helper& helper,
                                     const nsIID& aIID) {
  void* newRawPtr;
  if (NS_FAILED(helper(aIID, &newRawPtr))) {
    newRawPtr = nullptr;
  }
  assign_assuming_AddRef(static_cast<T*>(newRawPtr));
}

template <class T>
void** nsCOMPtr<T>::begin_assignment() {
  assign_assuming_AddRef(nullptr);
  union {
    T** mT;
    void** mVoid;
  } result;
  result.mT = &mRawPtr;
  return result.mVoid;
}

template <class T>
inline nsCOMPtr<T>* address_of(nsCOMPtr<T>& aPtr) {
  return aPtr.get_address();
}

template <class T>
inline const nsCOMPtr<T>* address_of(const nsCOMPtr<T>& aPtr) {
  return aPtr.get_address();
}

/**
 * This class is designed to be used for anonymous temporary objects in the
 * argument list of calls that return COM interface pointers, e.g.,
 *
 *   nsCOMPtr<IFoo> fooP;
 *   ...->QueryInterface(iid, getter_AddRefs(fooP))
 *
 * DO NOT USE THIS TYPE DIRECTLY IN YOUR CODE. Use |getter_AddRefs()| instead.
 *
 * When initialized with a |nsCOMPtr|, as in the example above, it returns
 * a |void**|, a |T**|, or an |nsISupports**| as needed, that the outer call
 * (|QueryInterface| in this case) can fill in.
 *
 * This type should be a nested class inside |nsCOMPtr<T>|.
 */
template <class T>
class nsGetterAddRefs {
 public:
  explicit nsGetterAddRefs(nsCOMPtr<T>& aSmartPtr)
      : mTargetSmartPtr(aSmartPtr) {}

#if defined(NSCAP_FEATURE_TEST_DONTQUERY_CASES) || \
    defined(NSCAP_LOG_EXTERNAL_ASSIGNMENT)
  ~nsGetterAddRefs() {
#  ifdef NSCAP_LOG_EXTERNAL_ASSIGNMENT
    NSCAP_LOG_ASSIGNMENT(reinterpret_cast<void*>(address_of(mTargetSmartPtr)),
                         mTargetSmartPtr.get());
#  endif

#  ifdef NSCAP_FEATURE_TEST_DONTQUERY_CASES
    mTargetSmartPtr.Assert_NoQueryNeeded();
#  endif
  }
#endif

  operator void**() {
    return reinterpret_cast<void**>(mTargetSmartPtr.StartAssignment());
  }

  operator T**() { return mTargetSmartPtr.StartAssignment(); }
  T*& operator*() { return *(mTargetSmartPtr.StartAssignment()); }

 private:
  nsCOMPtr<T>& mTargetSmartPtr;
};

template <>
class nsGetterAddRefs<nsISupports> {
 public:
  explicit nsGetterAddRefs(nsCOMPtr<nsISupports>& aSmartPtr)
      : mTargetSmartPtr(aSmartPtr) {}

#ifdef NSCAP_LOG_EXTERNAL_ASSIGNMENT
  ~nsGetterAddRefs() {
    NSCAP_LOG_ASSIGNMENT(reinterpret_cast<void*>(address_of(mTargetSmartPtr)),
                         mTargetSmartPtr.get());
  }
#endif

  operator void**() {
    return reinterpret_cast<void**>(mTargetSmartPtr.StartAssignment());
  }

  operator nsISupports**() { return mTargetSmartPtr.StartAssignment(); }
  nsISupports*& operator*() { return *(mTargetSmartPtr.StartAssignment()); }

 private:
  nsCOMPtr<nsISupports>& mTargetSmartPtr;
};

template <class T>
inline nsGetterAddRefs<T> getter_AddRefs(nsCOMPtr<T>& aSmartPtr) {
  return nsGetterAddRefs<T>(aSmartPtr);
}

template <class T, class DestinationType>
inline nsresult CallQueryInterface(
    T* aSource, nsGetterAddRefs<DestinationType> aDestination) {
  return CallQueryInterface(aSource,
                            static_cast<DestinationType**>(aDestination));
}

// Comparing two |nsCOMPtr|s

template <class T, class U>
inline bool operator==(const nsCOMPtr<T>& aLhs, const nsCOMPtr<U>& aRhs) {
  return static_cast<const T*>(aLhs.get()) == static_cast<const U*>(aRhs.get());
}

template <class T, class U>
inline bool operator!=(const nsCOMPtr<T>& aLhs, const nsCOMPtr<U>& aRhs) {
  return static_cast<const T*>(aLhs.get()) != static_cast<const U*>(aRhs.get());
}

// Comparing an |nsCOMPtr| to a raw pointer

template <class T, class U>
inline bool operator==(const nsCOMPtr<T>& aLhs, const U* aRhs) {
  return static_cast<const T*>(aLhs.get()) == aRhs;
}

template <class T, class U>
inline bool operator==(const U* aLhs, const nsCOMPtr<T>& aRhs) {
  return aLhs == static_cast<const T*>(aRhs.get());
}

template <class T, class U>
inline bool operator!=(const nsCOMPtr<T>& aLhs, const U* aRhs) {
  return static_cast<const T*>(aLhs.get()) != aRhs;
}

template <class T, class U>
inline bool operator!=(const U* aLhs, const nsCOMPtr<T>& aRhs) {
  return aLhs != static_cast<const T*>(aRhs.get());
}

template <class T, class U>
inline bool operator==(const nsCOMPtr<T>& aLhs, U* aRhs) {
  return static_cast<const T*>(aLhs.get()) == const_cast<const U*>(aRhs);
}

template <class T, class U>
inline bool operator==(U* aLhs, const nsCOMPtr<T>& aRhs) {
  return const_cast<const U*>(aLhs) == static_cast<const T*>(aRhs.get());
}

template <class T, class U>
inline bool operator!=(const nsCOMPtr<T>& aLhs, U* aRhs) {
  return static_cast<const T*>(aLhs.get()) != const_cast<const U*>(aRhs);
}

template <class T, class U>
inline bool operator!=(U* aLhs, const nsCOMPtr<T>& aRhs) {
  return const_cast<const U*>(aLhs) != static_cast<const T*>(aRhs.get());
}

// Comparing an |nsCOMPtr| to |nullptr|

template <class T>
inline bool operator==(const nsCOMPtr<T>& aLhs, decltype(nullptr)) {
  return aLhs.get() == nullptr;
}

template <class T>
inline bool operator==(decltype(nullptr), const nsCOMPtr<T>& aRhs) {
  return nullptr == aRhs.get();
}

template <class T>
inline bool operator!=(const nsCOMPtr<T>& aLhs, decltype(nullptr)) {
  return aLhs.get() != nullptr;
}

template <class T>
inline bool operator!=(decltype(nullptr), const nsCOMPtr<T>& aRhs) {
  return nullptr != aRhs.get();
}

// Comparing any two [XP]COM objects for identity

inline bool SameCOMIdentity(nsISupports* aLhs, nsISupports* aRhs) {
  return nsCOMPtr<nsISupports>(do_QueryInterface(aLhs)) ==
         nsCOMPtr<nsISupports>(do_QueryInterface(aRhs));
}

template <class SourceType, class DestinationType>
inline nsresult CallQueryInterface(nsCOMPtr<SourceType>& aSourcePtr,
                                   DestinationType** aDestPtr) {
  return CallQueryInterface(aSourcePtr.get(), aDestPtr);
}

template <class T>
RefPtr<T>::RefPtr(const nsQueryReferent& aQueryReferent) {
  void* newRawPtr;
  if (NS_FAILED(aQueryReferent(NS_GET_TEMPLATE_IID(T), &newRawPtr))) {
    newRawPtr = nullptr;
  }
  mRawPtr = static_cast<T*>(newRawPtr);
}

template <class T>
RefPtr<T>::RefPtr(const nsCOMPtr_helper& aHelper) {
  void* newRawPtr;
  if (NS_FAILED(aHelper(NS_GET_TEMPLATE_IID(T), &newRawPtr))) {
    newRawPtr = nullptr;
  }
  mRawPtr = static_cast<T*>(newRawPtr);
}

template <class T>
RefPtr<T>& RefPtr<T>::operator=(const nsQueryReferent& aQueryReferent) {
  void* newRawPtr;
  if (NS_FAILED(aQueryReferent(NS_GET_TEMPLATE_IID(T), &newRawPtr))) {
    newRawPtr = nullptr;
  }
  assign_assuming_AddRef(static_cast<T*>(newRawPtr));
  return *this;
}

template <class T>
RefPtr<T>& RefPtr<T>::operator=(const nsCOMPtr_helper& aHelper) {
  void* newRawPtr;
  if (NS_FAILED(aHelper(NS_GET_TEMPLATE_IID(T), &newRawPtr))) {
    newRawPtr = nullptr;
  }
  assign_assuming_AddRef(static_cast<T*>(newRawPtr));
  return *this;
}

template <class T>
inline already_AddRefed<T> do_AddRef(const nsCOMPtr<T>& aObj) {
  nsCOMPtr<T> ref(aObj);
  return ref.forget();
}

// MOZ_DBG support

template <class T>
std::ostream& operator<<(std::ostream& aOut, const nsCOMPtr<T>& aObj) {
  return mozilla::DebugValue(aOut, aObj.get());
}

// ToRefPtr allows to move an nsCOMPtr<T> into a RefPtr<T>. Be mindful when
// using this, because usually RefPtr<T> should only be used with concrete T and
// nsCOMPtr<T> should only be used with XPCOM interface T.
template <class T>
RefPtr<T> ToRefPtr(nsCOMPtr<T>&& aObj) {
  return aObj.forget();
}

// Integration with ResultExtensions.h
template <typename R>
auto ResultRefAsParam(nsCOMPtr<R>& aResult) {
  return getter_AddRefs(aResult);
}

namespace mozilla::detail {
template <typename T>
struct outparam_as_pointer;

template <typename T>
struct outparam_as_pointer<nsGetterAddRefs<T>> {
  using type = T**;
};
}  // namespace mozilla::detail

#endif  // !defined(nsCOMPtr_h___)