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Minimal test - lines (64, 77)

Code

class nsArrayCC final : public nsArrayBase {
  friend class nsArrayBase;

 public:
  NS_DECL_CYCLE_COLLECTING_ISUPPORTS
  NS_DECL_CYCLE_COLLECTION_CLASS_AMBIGUOUS(nsArrayCC, nsIMutableArray)

 private:
  nsArrayCC() : nsArrayBase() {}
  nsArrayCC(const nsArrayCC& aOther);
  explicit nsArrayCC(const nsCOMArray_base& aBaseArray)
      : nsArrayBase(aBaseArray) {}
  ~nsArrayCC() = default;
};

Minimal test - lines (25, 48)

Code

class nsArrayBase : public nsIMutableArray {
 public:
  NS_DECL_NSIARRAY
  NS_DECL_NSIARRAYEXTENSIONS
  NS_DECL_NSIMUTABLEARRAY

  /* Both of these factory functions create a cycle-collectable array
     on the main thread and a non-cycle-collectable array on other
     threads.  */
  static already_AddRefed Create();
  /* Only for the benefit of the XPCOM module system, use Create()
     instead.  */
  static nsresult XPCOMConstructor(nsISupports* aOuter, const nsIID& aIID,
                                   void** aResult);

 protected:
  nsArrayBase() = default;
  nsArrayBase(const nsArrayBase& aOther);
  explicit nsArrayBase(const nsCOMArray_base& aBaseArray)
      : mArray(aBaseArray) {}
  virtual ~nsArrayBase();

  nsCOMArray_base mArray;
};

Minimal test - lines (50, 62)

Code

class nsArray final : public nsArrayBase {
  friend class nsArrayBase;

 public:
  NS_DECL_ISUPPORTS

 private:
  nsArray() : nsArrayBase() {}
  nsArray(const nsArray& aOther);
  explicit nsArray(const nsCOMArray_base& aBaseArray)
      : nsArrayBase(aBaseArray) {}
  ~nsArray() = default;
};