The Tor Browser: xpcom/glue/nsCOMPtr.h@129ffea94266 (annotated)

xpcom/glue/nsCOMPtr.h@129ffea94266 (annotated)

xpcom/glue/nsCOMPtr.h

Sat, 03 Jan 2015 20:18:00 +0100

author: Michael Schloh von Bennewitz <michael@schloh.com>
date: Sat, 03 Jan 2015 20:18:00 +0100
branch: TOR_BUG_3246
changeset 7: 129ffea94266
permissions: -rw-r--r--

Conditionally enable double key logic according to:
private browsing mode or privacy.thirdparty.isolate preference and
implement in GetCookieStringCommon and FindCookie where it counts...
With some reservations of how to convince FindCookie users to test
condition and pass a nullptr when disabling double key logic.

 /* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
 /* 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 User Manual at:
     http://www.mozilla.org/projects/xpcom/nsCOMPtr.html
   nsCOMPtr
     better than a raw pointer
   for owning objects
                        -- scc
 */
 #include "mozilla/Attributes.h"
 #include "mozilla/TypeTraits.h"
 #include "mozilla/Assertions.h"
 #include "mozilla/NullPtr.h"
 #include "mozilla/Move.h"
 #include "nsDebug.h" // for |NS_ABORT_IF_FALSE|, |NS_ASSERTION|
 #include "nsISupportsUtils.h" // for |nsresult|, |NS_ADDREF|, |NS_GET_TEMPLATE_IID| et al
 #include "nscore.h" // for |NS_COM_GLUE|
 #include "nsCycleCollectionNoteChild.h"
 /*
   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
   #define NSCAP_FEATURE_INLINE_STARTASSIGNMENT
     // under VC++, we win by inlining 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
 #define NSCAP_FEATURE_USE_BASE
 #ifdef DEBUG
   #define NSCAP_FEATURE_TEST_DONTQUERY_CASES
   #undef NSCAP_FEATURE_USE_BASE
 //#define NSCAP_FEATURE_TEST_NONNULL_QUERY_SUCCEEDS
 #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
 #if defined(NSCAP_DISABLE_DEBUG_PTR_TYPES)
   #define NSCAP_FEATURE_USE_BASE
 #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)     (ptr)->AddRef()
 #endif
 #ifndef NSCAP_RELEASE
   #define NSCAP_RELEASE(this, ptr)    (ptr)->Release()
 #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 {
 struct unused_t;
 } // namespace mozilla
 template <class T>
 struct already_AddRefed
     /*
       ...cooperates with |nsCOMPtr| to allow you to assign in a pointer _without_
       |AddRef|ing it.  You might want to use this as a return type from a function
       that produces an already |AddRef|ed pointer as a result.
       See also |getter_AddRefs()|, |dont_AddRef()|, and |class nsGetterAddRefs|.
       This type should be a nested class inside |nsCOMPtr<T>|.
       Yes, |already_AddRefed| could have been implemented as an |nsCOMPtr_helper| to
       avoid adding specialized machinery to |nsCOMPtr| ... but this is the simplest
       case, and perhaps worth the savings in time and space that its specific
       implementation affords over the more general solution offered by
       |nsCOMPtr_helper|.
     */
   {
     /*
      * Prohibit all one-argument overloads but already_AddRefed(T*) and
      * already_AddRefed(decltype(nullptr)), and funnel the nullptr case through
      * the T* constructor.
      */
     template<typename N>
     already_AddRefed(N,
                      typename mozilla::EnableIf<mozilla::IsNullPointer<N>::value,
                                                 int>::Type dummy = 0)
       : mRawPtr(nullptr)
     {
       // nothing else to do here
     }
     already_AddRefed( T* aRawPtr )
       : mRawPtr(aRawPtr)
     {
       // nothing else to do here
     }
     // Disallowed.  Use move semantics instead.
     already_AddRefed(const already_AddRefed<T>& aOther) MOZ_DELETE;
     already_AddRefed(already_AddRefed<T>&& aOther)
       : mRawPtr(aOther.take())
     {
       // nothing else to do here
     }
     ~already_AddRefed()
     {
       MOZ_ASSERT(!mRawPtr);
     }
     // Specialize the unused operator<< for already_AddRefed, to allow
     // nsCOMPtr<nsIFoo> foo;
     // unused << foo.forget();
     friend void operator<<(const mozilla::unused_t& unused,
                            const already_AddRefed<T>& rhs)
     {
       auto mutableAlreadyAddRefed = const_cast<already_AddRefed<T>*>(&rhs);
       unused << mutableAlreadyAddRefed->take();
     }
     MOZ_WARN_UNUSED_RESULT T* take()
     {
       T* rawPtr = mRawPtr;
       mRawPtr = nullptr;
       return rawPtr;
     }
     /**
      * This helper is useful in cases like
      *
      *  already_AddRefed<BaseClass>
      *  Foo()
      *  {
      *    nsRefPtr<SubClass> x = ...;
      *    return x.forget();
      *  }
      *
      * The autoconversion allows one to omit the idiom
      *
      *    nsRefPtr<BaseClass> y = x.forget();
      *    return y.forget();
      */
     template<class U>
     operator already_AddRefed<U>()
     {
       U* tmp = mRawPtr;
       mRawPtr = nullptr;
       return already_AddRefed<U>(tmp);
     }
     /**
      * This helper provides a static_cast replacement for already_AddRefed, so
      * if you have
      *
      *   already_AddRefed<Parent> F();
      *
      * you can write
      *
      *   already_AddRefed<Child>
      *   G()
      *   {
      *     return F().downcast<Child>();
      *   }
      *
      * instead of
      *
      *     return dont_AddRef(static_cast<Child*>(F().get()));
      */
     template<class U>
     already_AddRefed<U> downcast()
     {
       U* tmp = static_cast<U*>(mRawPtr);
       mRawPtr = nullptr;
       return already_AddRefed<U>(tmp);
     }
   private:
     T* mRawPtr;
   };
 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 mozilla::Move(aAlreadyAddRefedPtr);
   }
 class nsCOMPtr_helper
     /*
       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.
     */
   {
     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
   NS_COM_GLUE
   MOZ_STACK_CLASS
 nsQueryInterface MOZ_FINAL
   {
     public:
       explicit
       nsQueryInterface( nsISupports* aRawPtr )
           : mRawPtr(aRawPtr)
         {
           // nothing else to do here
         }
       nsresult NS_FASTCALL operator()( const nsIID& aIID, void** ) const;
     private:
       nsISupports*  mRawPtr;
   };
 class NS_COM_GLUE nsQueryInterfaceWithError
   {
     public:
       nsQueryInterfaceWithError( nsISupports* aRawPtr, nsresult* error )
           : mRawPtr(aRawPtr),
             mErrorPtr(error)
         {
           // nothing else to do here
         }
       nsresult NS_FASTCALL operator()( const nsIID& aIID, void** ) const;
     private:
       nsISupports*  mRawPtr;
       nsresult*     mErrorPtr;
   };
 inline
 nsQueryInterface
 do_QueryInterface( nsISupports* aRawPtr )
   {
     return nsQueryInterface(aRawPtr);
   }
 inline
 nsQueryInterfaceWithError
 do_QueryInterface( nsISupports* aRawPtr, nsresult* error )
   {
     return nsQueryInterfaceWithError(aRawPtr, error);
   }
 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 <http://bugzilla.mozilla.org/show_bug.cgi?id=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 <http://bugzilla.mozilla.org/show_bug.cgi?id=8221>.
   }
 ////////////////////////////////////////////////////////////////////////////
 // Using servicemanager with COMPtrs
 class NS_COM_GLUE nsGetServiceByCID
 {
  public:
     explicit nsGetServiceByCID(const nsCID& aCID)
         : mCID(aCID)
         {
             // nothing else to do
         }
     nsresult NS_FASTCALL operator()( const nsIID&, void** ) const;
  private:
     const nsCID&                mCID;
 };
 class NS_COM_GLUE nsGetServiceByCIDWithError
 {
  public:
     nsGetServiceByCIDWithError( const nsCID& aCID, nsresult* aErrorPtr )
         : mCID(aCID),
           mErrorPtr(aErrorPtr)
         {
             // nothing else to do
         }
     nsresult NS_FASTCALL operator()( const nsIID&, void** ) const;
  private:
     const nsCID&                mCID;
     nsresult*                   mErrorPtr;
 };
 class NS_COM_GLUE nsGetServiceByContractID
 {
  public:
     explicit nsGetServiceByContractID(const char* aContractID)
         : mContractID(aContractID)
         {
             // nothing else to do
         }
     nsresult NS_FASTCALL operator()( const nsIID&, void** ) const;
  private:
     const char*                 mContractID;
 };
 class NS_COM_GLUE nsGetServiceByContractIDWithError
 {
  public:
     nsGetServiceByContractIDWithError(const char* aContractID, nsresult* aErrorPtr)
         : mContractID(aContractID),
           mErrorPtr(aErrorPtr)
         {
             // nothing else to do
         }
     nsresult NS_FASTCALL operator()( const nsIID&, void** ) const;
  private:
     const char*                 mContractID;
     nsresult*                   mErrorPtr;
 };
 class
 nsCOMPtr_base
     /*
       ...factors implementation for all template versions of |nsCOMPtr|.
       This should really be an |nsCOMPtr<nsISupports>|, but this wouldn't work
       because unlike the
       Here's the way people normally do things like this
         template <class T> class Foo { ... };
         template <> class Foo<void*> { ... };
         template <class T> class Foo<T*> : private Foo<void*> { ... };
     */
   {
     public:
       nsCOMPtr_base( nsISupports* rawPtr = 0 )
           : mRawPtr(rawPtr)
         {
           // nothing else to do here
         }
       NS_COM_GLUE NS_CONSTRUCTOR_FASTCALL ~nsCOMPtr_base()
         {
           NSCAP_LOG_RELEASE(this, mRawPtr);
             if ( mRawPtr )
               NSCAP_RELEASE(this, mRawPtr);
         }
       NS_COM_GLUE void NS_FASTCALL   assign_with_AddRef( nsISupports* );
       NS_COM_GLUE void NS_FASTCALL   assign_from_qi( const nsQueryInterface, const nsIID& );
       NS_COM_GLUE void NS_FASTCALL   assign_from_qi_with_error( const nsQueryInterfaceWithError&, const nsIID& );
       NS_COM_GLUE void NS_FASTCALL   assign_from_gs_cid( const nsGetServiceByCID, const nsIID& );
       NS_COM_GLUE void NS_FASTCALL   assign_from_gs_cid_with_error( const nsGetServiceByCIDWithError&, const nsIID& );
       NS_COM_GLUE void NS_FASTCALL   assign_from_gs_contractid( const nsGetServiceByContractID, const nsIID& );
       NS_COM_GLUE void NS_FASTCALL   assign_from_gs_contractid_with_error( const nsGetServiceByContractIDWithError&, const nsIID& );
       NS_COM_GLUE void NS_FASTCALL   assign_from_helper( const nsCOMPtr_helper&, const nsIID& );
       NS_COM_GLUE void** NS_FASTCALL begin_assignment();
     protected:
       NS_MAY_ALIAS_PTR(nsISupports) mRawPtr;
       void
       assign_assuming_AddRef( nsISupports* newPtr )
         {
             /*
               |AddRef()|ing the new value (before entering this function) before
               |Release()|ing the old lets us safely ignore the self-assignment case.
               We must, however, be careful only to |Release()| _after_ doing the
               assignment, in case the |Release()| leads to our _own_ destruction,
               which would, in turn, cause an incorrect second |Release()| of our old
               pointer.  Thank <waterson@netscape.com> for discovering this.
             */
           nsISupports* oldPtr = mRawPtr;
           mRawPtr = newPtr;
           NSCAP_LOG_ASSIGNMENT(this, newPtr);
           NSCAP_LOG_RELEASE(this, oldPtr);
           if ( oldPtr )
             NSCAP_RELEASE(this, oldPtr);
         }
   };
 // template <class T> class nsGetterAddRefs;
 template <class T>
 class nsCOMPtr MOZ_FINAL
 #ifdef NSCAP_FEATURE_USE_BASE
     : private nsCOMPtr_base
 #endif
   {
 #ifdef NSCAP_FEATURE_USE_BASE
   #define NSCAP_CTOR_BASE(x) nsCOMPtr_base(x)
 #else
   #define NSCAP_CTOR_BASE(x) mRawPtr(x)
     private:
       void    assign_with_AddRef( nsISupports* );
       void    assign_from_qi( const nsQueryInterface, const nsIID& );
       void    assign_from_qi_with_error( const nsQueryInterfaceWithError&, 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_helper( const nsCOMPtr_helper&, const nsIID& );
       void**  begin_assignment();
       void
       assign_assuming_AddRef( T* newPtr )
         {
           T* oldPtr = mRawPtr;
           mRawPtr = newPtr;
           NSCAP_LOG_ASSIGNMENT(this, newPtr);
           NSCAP_LOG_RELEASE(this, oldPtr);
           if ( oldPtr )
             NSCAP_RELEASE(this, oldPtr);
         }
     private:
       T* mRawPtr;
 #endif
     public:
       typedef T element_type;
 #ifndef NSCAP_FEATURE_USE_BASE
      ~nsCOMPtr()
         {
           NSCAP_LOG_RELEASE(this, mRawPtr);
           if ( mRawPtr )
             NSCAP_RELEASE(this, mRawPtr);
         }
 #endif
 #ifdef NSCAP_FEATURE_TEST_DONTQUERY_CASES
       void
       Assert_NoQueryNeeded()
         {
           if ( mRawPtr )
             {
               nsCOMPtr<T> query_result( do_QueryInterface(mRawPtr) );
               NS_ASSERTION(query_result.get() == mRawPtr, "QueryInterface needed");
             }
         }
   #define NSCAP_ASSERT_NO_QUERY_NEEDED() Assert_NoQueryNeeded();
 #else
   #define NSCAP_ASSERT_NO_QUERY_NEEDED()
 #endif
         // Constructors
       nsCOMPtr()
             : NSCAP_CTOR_BASE(0)
           // default constructor
         {
           NSCAP_LOG_ASSIGNMENT(this, 0);
         }
       nsCOMPtr( const nsCOMPtr<T>& aSmartPtr )
             : NSCAP_CTOR_BASE(aSmartPtr.mRawPtr)
           // copy-constructor
         {
           if ( mRawPtr )
             NSCAP_ADDREF(this, mRawPtr);
           NSCAP_LOG_ASSIGNMENT(this, aSmartPtr.mRawPtr);
         }
       nsCOMPtr( T* aRawPtr )
             : NSCAP_CTOR_BASE(aRawPtr)
           // construct from a raw pointer (of the right type)
         {
           if ( mRawPtr )
             NSCAP_ADDREF(this, mRawPtr);
           NSCAP_LOG_ASSIGNMENT(this, aRawPtr);
           NSCAP_ASSERT_NO_QUERY_NEEDED();
         }
       nsCOMPtr( already_AddRefed<T>& aSmartPtr )
             : NSCAP_CTOR_BASE(aSmartPtr.take())
           // construct from |already_AddRefed|
         {
           NSCAP_LOG_ASSIGNMENT(this, mRawPtr);
           NSCAP_ASSERT_NO_QUERY_NEEDED();
         }
       nsCOMPtr( already_AddRefed<T>&& aSmartPtr )
             : NSCAP_CTOR_BASE(aSmartPtr.take())
           // construct from |otherComPtr.forget()|
         {
           NSCAP_LOG_ASSIGNMENT(this, mRawPtr);
           NSCAP_ASSERT_NO_QUERY_NEEDED();
         }
       template<typename U>
       nsCOMPtr( already_AddRefed<U>& aSmartPtr )
             : NSCAP_CTOR_BASE(static_cast<T*>(aSmartPtr.take()))
           // construct from |already_AddRefed|
         {
           // But make sure that U actually inherits from T
           static_assert(mozilla::IsBaseOf<T, U>::value,
                         "U is not a subclass of T");
           NSCAP_LOG_ASSIGNMENT(this, static_cast<T*>(mRawPtr));
           NSCAP_ASSERT_NO_QUERY_NEEDED();
         }
       template<typename U>
       nsCOMPtr( already_AddRefed<U>&& aSmartPtr )
             : NSCAP_CTOR_BASE(static_cast<T*>(aSmartPtr.take()))
           // construct from |otherComPtr.forget()|
         {
           // But make sure that U actually inherits from T
           static_assert(mozilla::IsBaseOf<T, U>::value,
                         "U is not a subclass of T");
           NSCAP_LOG_ASSIGNMENT(this, static_cast<T*>(mRawPtr));
           NSCAP_ASSERT_NO_QUERY_NEEDED();
         }
       nsCOMPtr( const nsQueryInterface qi )
             : NSCAP_CTOR_BASE(0)
           // construct from |do_QueryInterface(expr)|
         {
           NSCAP_LOG_ASSIGNMENT(this, 0);
           assign_from_qi(qi, NS_GET_TEMPLATE_IID(T));
         }
       nsCOMPtr( const nsQueryInterfaceWithError& qi )
             : NSCAP_CTOR_BASE(0)
           // construct from |do_QueryInterface(expr, &rv)|
         {
           NSCAP_LOG_ASSIGNMENT(this, 0);
           assign_from_qi_with_error(qi, NS_GET_TEMPLATE_IID(T));
         }
       nsCOMPtr( const nsGetServiceByCID gs )
             : NSCAP_CTOR_BASE(0)
           // construct from |do_GetService(cid_expr)|
         {
           NSCAP_LOG_ASSIGNMENT(this, 0);
           assign_from_gs_cid(gs, NS_GET_TEMPLATE_IID(T));
         }
       nsCOMPtr( const nsGetServiceByCIDWithError& gs )
             : NSCAP_CTOR_BASE(0)
           // construct from |do_GetService(cid_expr, &rv)|
         {
           NSCAP_LOG_ASSIGNMENT(this, 0);
           assign_from_gs_cid_with_error(gs, NS_GET_TEMPLATE_IID(T));
         }
       nsCOMPtr( const nsGetServiceByContractID gs )
             : NSCAP_CTOR_BASE(0)
           // construct from |do_GetService(contractid_expr)|
         {
           NSCAP_LOG_ASSIGNMENT(this, 0);
           assign_from_gs_contractid(gs, NS_GET_TEMPLATE_IID(T));
         }
       nsCOMPtr( const nsGetServiceByContractIDWithError& gs )
             : NSCAP_CTOR_BASE(0)
           // construct from |do_GetService(contractid_expr, &rv)|
         {
           NSCAP_LOG_ASSIGNMENT(this, 0);
           assign_from_gs_contractid_with_error(gs, NS_GET_TEMPLATE_IID(T));
         }
       nsCOMPtr( const nsCOMPtr_helper& helper )
             : NSCAP_CTOR_BASE(0)
           // ...and finally, anything else we might need to construct from
           //  can exploit the |nsCOMPtr_helper| facility
         {
           NSCAP_LOG_ASSIGNMENT(this, 0);
           assign_from_helper(helper, NS_GET_TEMPLATE_IID(T));
           NSCAP_ASSERT_NO_QUERY_NEEDED();
         }
         // Assignment operators
       nsCOMPtr<T>&
       operator=( const nsCOMPtr<T>& rhs )
           // copy assignment operator
         {
           assign_with_AddRef(rhs.mRawPtr);
           return *this;
         }
       nsCOMPtr<T>&
       operator=( T* rhs )
           // assign from a raw pointer (of the right type)
         {
           assign_with_AddRef(rhs);
           NSCAP_ASSERT_NO_QUERY_NEEDED();
           return *this;
         }
       template<typename U>
       nsCOMPtr<T>&
       operator=( already_AddRefed<U>& rhs )
           // assign from |already_AddRefed|
         {
           // Make sure that U actually inherits from T
           static_assert(mozilla::IsBaseOf<T, U>::value,
                         "U is not a subclass of T");
           assign_assuming_AddRef(static_cast<T*>(rhs.take()));
           NSCAP_ASSERT_NO_QUERY_NEEDED();
           return *this;
         }
       template<typename U>
       nsCOMPtr<T>&
       operator=( already_AddRefed<U>&& rhs )
           // assign from |otherComPtr.forget()|
         {
           // Make sure that U actually inherits from T
           static_assert(mozilla::IsBaseOf<T, U>::value,
                         "U is not a subclass of T");
           assign_assuming_AddRef(static_cast<T*>(rhs.take()));
           NSCAP_ASSERT_NO_QUERY_NEEDED();
           return *this;
         }
       nsCOMPtr<T>&
       operator=( const nsQueryInterface rhs )
           // assign from |do_QueryInterface(expr)|
         {
           assign_from_qi(rhs, NS_GET_TEMPLATE_IID(T));
           return *this;
         }
       nsCOMPtr<T>&
       operator=( const nsQueryInterfaceWithError& rhs )
           // assign from |do_QueryInterface(expr, &rv)|
         {
           assign_from_qi_with_error(rhs, NS_GET_TEMPLATE_IID(T));
           return *this;
         }
       nsCOMPtr<T>&
       operator=( const nsGetServiceByCID rhs )
           // assign from |do_GetService(cid_expr)|
         {
           assign_from_gs_cid(rhs, NS_GET_TEMPLATE_IID(T));
           return *this;
         }
       nsCOMPtr<T>&
       operator=( const nsGetServiceByCIDWithError& rhs )
           // assign from |do_GetService(cid_expr, &rv)|
         {
           assign_from_gs_cid_with_error(rhs, NS_GET_TEMPLATE_IID(T));
           return *this;
         }
       nsCOMPtr<T>&
       operator=( const nsGetServiceByContractID rhs )
           // assign from |do_GetService(contractid_expr)|
         {
           assign_from_gs_contractid(rhs, NS_GET_TEMPLATE_IID(T));
           return *this;
         }
       nsCOMPtr<T>&
       operator=( const nsGetServiceByContractIDWithError& rhs )
           // assign from |do_GetService(contractid_expr, &rv)|
         {
           assign_from_gs_contractid_with_error(rhs, NS_GET_TEMPLATE_IID(T));
           return *this;
         }
       nsCOMPtr<T>&
       operator=( const nsCOMPtr_helper& rhs )
           // ...and finally, anything else we might need to assign from
           //  can exploit the |nsCOMPtr_helper| facility.
         {
           assign_from_helper(rhs, NS_GET_TEMPLATE_IID(T));
           NSCAP_ASSERT_NO_QUERY_NEEDED();
           return *this;
         }
       void
       swap( nsCOMPtr<T>& rhs )
           // ...exchange ownership with |rhs|; can save a pair of refcount operations
         {
 #ifdef NSCAP_FEATURE_USE_BASE
           nsISupports* temp = rhs.mRawPtr;
 #else
           T* temp = rhs.mRawPtr;
 #endif
           NSCAP_LOG_ASSIGNMENT(&rhs, mRawPtr);
           NSCAP_LOG_ASSIGNMENT(this, temp);
           NSCAP_LOG_RELEASE(this, mRawPtr);
           NSCAP_LOG_RELEASE(&rhs, temp);
           rhs.mRawPtr = mRawPtr;
           mRawPtr = temp;
           // |rhs| maintains the same invariants, so we don't need to |NSCAP_ASSERT_NO_QUERY_NEEDED|
         }
       void
       swap( T*& rhs )
           // ...exchange ownership with |rhs|; can save a pair of refcount operations
         {
 #ifdef NSCAP_FEATURE_USE_BASE
           nsISupports* temp = rhs;
 #else
           T* temp = rhs;
 #endif
           NSCAP_LOG_ASSIGNMENT(this, temp);
           NSCAP_LOG_RELEASE(this, mRawPtr);
           rhs = reinterpret_cast<T*>(mRawPtr);
           mRawPtr = temp;
           NSCAP_ASSERT_NO_QUERY_NEEDED();
         }
         // Other pointer operators
       already_AddRefed<T>
       forget()
           // return the value of mRawPtr and null out mRawPtr. Useful for
           // already_AddRefed return values.
         {
           T* temp = 0;
           swap(temp);
           return already_AddRefed<T>(temp);
         }
       template <typename I>
       void
       forget( I** rhs )
           // Set the target of rhs to the value of mRawPtr and null out mRawPtr.
           // Useful to avoid unnecessary AddRef/Release pairs with "out"
           // parameters where rhs bay be a T** or an I** where I is a base class
           // of T.
         {
           NS_ASSERTION(rhs, "Null pointer passed to forget!");
           NSCAP_LOG_RELEASE(this, mRawPtr);
           *rhs = get();
           mRawPtr = 0;
         }
       T*
       get() const
           /*
             Prefer the implicit conversion provided automatically by |operator T*() const|.
             Use |get()| to resolve ambiguity or to get a castable pointer.
           */
         {
           return reinterpret_cast<T*>(mRawPtr);
         }
       operator T*() const
           /*
             ...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.
           */
         {
           return get();
         }
       T*
       operator->() const
         {
           NS_ABORT_IF_FALSE(mRawPtr != 0, "You can't dereference a NULL nsCOMPtr with operator->().");
           return get();
         }
       nsCOMPtr<T>*
       get_address()
           // This is not intended to be used by clients.  See |address_of|
           // below.
         {
           return this;
         }
       const nsCOMPtr<T>*
       get_address() const
           // This is not intended to be used by clients.  See |address_of|
           // below.
         {
           return this;
         }
     public:
       T&
       operator*() const
         {
           NS_ABORT_IF_FALSE(mRawPtr != 0, "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(0);
           return reinterpret_cast<T**>(&mRawPtr);
 #endif
         }
   };
   /*
     Specializing |nsCOMPtr| for |nsISupports| allows us to use |nsCOMPtr<nsISupports>| the
     same way people use |nsISupports*| and |void*|, i.e., as a `catch-all' pointer pointing
     to any valid [XP]COM interface.  Otherwise, an |nsCOMPtr<nsISupports>| would only be able
     to point to the single [XP]COM-correct |nsISupports| instance within an object; extra
     querying ensues.  Clients need to be able to pass around arbitrary interface pointers,
     without hassles, through intermediary code that doesn't know the exact type.
   */
 template <>
 class nsCOMPtr<nsISupports>
     : private nsCOMPtr_base
   {
     public:
       typedef nsISupports element_type;
         // Constructors
       nsCOMPtr()
             : nsCOMPtr_base(0)
           // default constructor
         {
           NSCAP_LOG_ASSIGNMENT(this, 0);
         }
       nsCOMPtr( const nsCOMPtr<nsISupports>& aSmartPtr )
             : nsCOMPtr_base(aSmartPtr.mRawPtr)
           // copy constructor
         {
           if ( mRawPtr )
             NSCAP_ADDREF(this, mRawPtr);
           NSCAP_LOG_ASSIGNMENT(this, aSmartPtr.mRawPtr);
         }
       nsCOMPtr( nsISupports* aRawPtr )
             : nsCOMPtr_base(aRawPtr)
           // construct from a raw pointer (of the right type)
         {
           if ( mRawPtr )
             NSCAP_ADDREF(this, mRawPtr);
           NSCAP_LOG_ASSIGNMENT(this, aRawPtr);
         }
       nsCOMPtr( already_AddRefed<nsISupports>& aSmartPtr )
             : nsCOMPtr_base(aSmartPtr.take())
           // construct from |already_AddRefed|
         {
           NSCAP_LOG_ASSIGNMENT(this, mRawPtr);
         }
       nsCOMPtr( already_AddRefed<nsISupports>&& aSmartPtr )
             : nsCOMPtr_base(aSmartPtr.take())
           // construct from |otherComPtr.forget()|
         {
           NSCAP_LOG_ASSIGNMENT(this, mRawPtr);
         }
       nsCOMPtr( const nsQueryInterface qi )
             : nsCOMPtr_base(0)
           // assign from |do_QueryInterface(expr)|
         {
           NSCAP_LOG_ASSIGNMENT(this, 0);
           assign_from_qi(qi, NS_GET_IID(nsISupports));
         }
       nsCOMPtr( const nsQueryInterfaceWithError& qi )
             : nsCOMPtr_base(0)
           // assign from |do_QueryInterface(expr, &rv)|
         {
           NSCAP_LOG_ASSIGNMENT(this, 0);
           assign_from_qi_with_error(qi, NS_GET_IID(nsISupports));
         }
       nsCOMPtr( const nsGetServiceByCID gs )
             : nsCOMPtr_base(0)
           // assign from |do_GetService(cid_expr)|
         {
           NSCAP_LOG_ASSIGNMENT(this, 0);
           assign_from_gs_cid(gs, NS_GET_IID(nsISupports));
         }
       nsCOMPtr( const nsGetServiceByCIDWithError& gs )
             : nsCOMPtr_base(0)
           // assign from |do_GetService(cid_expr, &rv)|
         {
           NSCAP_LOG_ASSIGNMENT(this, 0);
           assign_from_gs_cid_with_error(gs, NS_GET_IID(nsISupports));
         }
       nsCOMPtr( const nsGetServiceByContractID gs )
             : nsCOMPtr_base(0)
           // assign from |do_GetService(contractid_expr)|
         {
           NSCAP_LOG_ASSIGNMENT(this, 0);
           assign_from_gs_contractid(gs, NS_GET_IID(nsISupports));
         }
       nsCOMPtr( const nsGetServiceByContractIDWithError& gs )
             : nsCOMPtr_base(0)
           // assign from |do_GetService(contractid_expr, &rv)|
         {
           NSCAP_LOG_ASSIGNMENT(this, 0);
           assign_from_gs_contractid_with_error(gs, NS_GET_IID(nsISupports));
         }
       nsCOMPtr( const nsCOMPtr_helper& helper )
             : nsCOMPtr_base(0)
           // ...and finally, anything else we might need to construct from
           //  can exploit the |nsCOMPtr_helper| facility
         {
           NSCAP_LOG_ASSIGNMENT(this, 0);
           assign_from_helper(helper, NS_GET_IID(nsISupports));
         }
         // Assignment operators
       nsCOMPtr<nsISupports>&
       operator=( const nsCOMPtr<nsISupports>& rhs )
           // copy assignment operator
         {
           assign_with_AddRef(rhs.mRawPtr);
           return *this;
         }
       nsCOMPtr<nsISupports>&
       operator=( nsISupports* rhs )
           // assign from a raw pointer (of the right type)
         {
           assign_with_AddRef(rhs);
           return *this;
         }
       nsCOMPtr<nsISupports>&
       operator=( already_AddRefed<nsISupports>& rhs )
           // assign from |already_AddRefed|
         {
           assign_assuming_AddRef(rhs.take());
           return *this;
         }
       nsCOMPtr<nsISupports>&
       operator=( already_AddRefed<nsISupports>&& rhs )
           // assign from |otherComPtr.forget()|
         {
           assign_assuming_AddRef(rhs.take());
           return *this;
         }
       nsCOMPtr<nsISupports>&
       operator=( const nsQueryInterface rhs )
           // assign from |do_QueryInterface(expr)|
         {
           assign_from_qi(rhs, NS_GET_IID(nsISupports));
           return *this;
         }
       nsCOMPtr<nsISupports>&
       operator=( const nsQueryInterfaceWithError& rhs )
           // assign from |do_QueryInterface(expr, &rv)|
         {
           assign_from_qi_with_error(rhs, NS_GET_IID(nsISupports));
           return *this;
         }
       nsCOMPtr<nsISupports>&
       operator=( const nsGetServiceByCID rhs )
           // assign from |do_GetService(cid_expr)|
         {
           assign_from_gs_cid(rhs, NS_GET_IID(nsISupports));
           return *this;
         }
       nsCOMPtr<nsISupports>&
       operator=( const nsGetServiceByCIDWithError& rhs )
           // assign from |do_GetService(cid_expr, &rv)|
         {
           assign_from_gs_cid_with_error(rhs, NS_GET_IID(nsISupports));
           return *this;
         }
       nsCOMPtr<nsISupports>&
       operator=( const nsGetServiceByContractID rhs )
           // assign from |do_GetService(contractid_expr)|
         {
           assign_from_gs_contractid(rhs, NS_GET_IID(nsISupports));
           return *this;
         }
       nsCOMPtr<nsISupports>&
       operator=( const nsGetServiceByContractIDWithError& rhs )
           // assign from |do_GetService(contractid_expr, &rv)|
         {
           assign_from_gs_contractid_with_error(rhs, NS_GET_IID(nsISupports));
           return *this;
         }
       nsCOMPtr<nsISupports>&
       operator=( const nsCOMPtr_helper& rhs )
           // ...and finally, anything else we might need to assign from
           //  can exploit the |nsCOMPtr_helper| facility.
         {
           assign_from_helper(rhs, NS_GET_IID(nsISupports));
           return *this;
         }
       void
       swap( nsCOMPtr<nsISupports>& rhs )
           // ...exchange ownership with |rhs|; can save a pair of refcount operations
         {
           nsISupports* temp = rhs.mRawPtr;
           NSCAP_LOG_ASSIGNMENT(&rhs, mRawPtr);
           NSCAP_LOG_ASSIGNMENT(this, temp);
           NSCAP_LOG_RELEASE(this, mRawPtr);
           NSCAP_LOG_RELEASE(&rhs, temp);
           rhs.mRawPtr = mRawPtr;
           mRawPtr = temp;
         }
       void
       swap( nsISupports*& rhs )
           // ...exchange ownership with |rhs|; can save a pair of refcount operations
         {
           nsISupports* temp = rhs;
           NSCAP_LOG_ASSIGNMENT(this, temp);
           NSCAP_LOG_RELEASE(this, mRawPtr);
           rhs = mRawPtr;
           mRawPtr = temp;
         }
       already_AddRefed<nsISupports>
       forget()
           // return the value of mRawPtr and null out mRawPtr. Useful for
           // already_AddRefed return values.
         {
           nsISupports* temp = 0;
           swap(temp);
           return already_AddRefed<nsISupports>(temp);
         }
       void
       forget( nsISupports** rhs )
           // Set the target of rhs to the value of mRawPtr and null out mRawPtr.
           // Useful to avoid unnecessary AddRef/Release pairs with "out"
           // parameters.
         {
           NS_ASSERTION(rhs, "Null pointer passed to forget!");
           *rhs = 0;
           swap(*rhs);
         }
         // Other pointer operators
       nsISupports*
       get() const
           /*
             Prefer the implicit conversion provided automatically by
             |operator nsISupports*() const|.
             Use |get()| to resolve ambiguity or to get a castable pointer.
           */
         {
           return reinterpret_cast<nsISupports*>(mRawPtr);
         }
       operator nsISupports*() const
           /*
             ...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.
           */
         {
           return get();
         }
       nsISupports*
       operator->() const
         {
           NS_ABORT_IF_FALSE(mRawPtr != 0, "You can't dereference a NULL nsCOMPtr with operator->().");
           return get();
         }
       nsCOMPtr<nsISupports>*
       get_address()
           // This is not intended to be used by clients.  See |address_of|
           // below.
         {
           return this;
         }
       const nsCOMPtr<nsISupports>*
       get_address() const
           // This is not intended to be used by clients.  See |address_of|
           // below.
         {
           return this;
         }
     public:
       nsISupports&
       operator*() const
         {
           NS_ABORT_IF_FALSE(mRawPtr != 0, "You can't dereference a NULL nsCOMPtr with operator*().");
           return *get();
         }
       nsISupports**
       StartAssignment()
         {
 #ifndef NSCAP_FEATURE_INLINE_STARTASSIGNMENT
           return reinterpret_cast<nsISupports**>(begin_assignment());
 #else
           assign_assuming_AddRef(0);
           return reinterpret_cast<nsISupports**>(&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);
 }
 #ifndef NSCAP_FEATURE_USE_BASE
 template <class T>
 void
 nsCOMPtr<T>::assign_with_AddRef( nsISupports* rawPtr )
   {
     if ( rawPtr )
       NSCAP_ADDREF(this, rawPtr);
     assign_assuming_AddRef(reinterpret_cast<T*>(rawPtr));
   }
 template <class T>
 void
 nsCOMPtr<T>::assign_from_qi( const nsQueryInterface qi, const nsIID& aIID )
   {
     void* newRawPtr;
     if ( NS_FAILED( qi(aIID, &newRawPtr) ) )
       newRawPtr = 0;
     assign_assuming_AddRef(static_cast<T*>(newRawPtr));
   }
 template <class T>
 void
 nsCOMPtr<T>::assign_from_qi_with_error( const nsQueryInterfaceWithError& qi, const nsIID& aIID )
   {
     void* newRawPtr;
     if ( NS_FAILED( qi(aIID, &newRawPtr) ) )
       newRawPtr = 0;
     assign_assuming_AddRef(static_cast<T*>(newRawPtr));
   }
 template <class T>
 void
 nsCOMPtr<T>::assign_from_gs_cid( const nsGetServiceByCID gs, const nsIID& aIID )
   {
     void* newRawPtr;
     if ( NS_FAILED( gs(aIID, &newRawPtr) ) )
       newRawPtr = 0;
     assign_assuming_AddRef(static_cast<T*>(newRawPtr));
   }
 template <class T>
 void
 nsCOMPtr<T>::assign_from_gs_cid_with_error( const nsGetServiceByCIDWithError& gs, const nsIID& aIID )
   {
     void* newRawPtr;
     if ( NS_FAILED( gs(aIID, &newRawPtr) ) )
       newRawPtr = 0;
     assign_assuming_AddRef(static_cast<T*>(newRawPtr));
   }
 template <class T>
 void
 nsCOMPtr<T>::assign_from_gs_contractid( const nsGetServiceByContractID gs, const nsIID& aIID )
   {
     void* newRawPtr;
     if ( NS_FAILED( gs(aIID, &newRawPtr) ) )
       newRawPtr = 0;
     assign_assuming_AddRef(static_cast<T*>(newRawPtr));
   }
 template <class T>
 void
 nsCOMPtr<T>::assign_from_gs_contractid_with_error( const nsGetServiceByContractIDWithError& gs, const nsIID& aIID )
   {
     void* newRawPtr;
     if ( NS_FAILED( gs(aIID, &newRawPtr) ) )
       newRawPtr = 0;
     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 = 0;
     assign_assuming_AddRef(static_cast<T*>(newRawPtr));
   }
 template <class T>
 void**
 nsCOMPtr<T>::begin_assignment()
   {
     assign_assuming_AddRef(0);
     union { T** mT; void** mVoid; } result;
     result.mT = &mRawPtr;
     return result.mVoid;
   }
 #endif
 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();
   }
 template <class T>
 class nsGetterAddRefs
     /*
       ...
       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>|.
     */
   {
     public:
       explicit
       nsGetterAddRefs( nsCOMPtr<T>& aSmartPtr )
           : mTargetSmartPtr(aSmartPtr)
         {
           // nothing else to do
         }
 #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)
         {
           // nothing else to do
         }
 #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 )
     /*
       Used around a |nsCOMPtr| when
       ...makes the class |nsGetterAddRefs<T>| invisible.
     */
   {
     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>& lhs, const nsCOMPtr<U>& rhs )
   {
     return static_cast<const T*>(lhs.get()) == static_cast<const U*>(rhs.get());
   }
 template <class T, class U>
 inline
 bool
 operator!=( const nsCOMPtr<T>& lhs, const nsCOMPtr<U>& rhs )
   {
     return static_cast<const T*>(lhs.get()) != static_cast<const U*>(rhs.get());
   }
   // Comparing an |nsCOMPtr| to a raw pointer
 template <class T, class U>
 inline
 bool
 operator==( const nsCOMPtr<T>& lhs, const U* rhs )
   {
     return static_cast<const T*>(lhs.get()) == rhs;
   }
 template <class T, class U>
 inline
 bool
 operator==( const U* lhs, const nsCOMPtr<T>& rhs )
   {
     return lhs == static_cast<const T*>(rhs.get());
   }
 template <class T, class U>
 inline
 bool
 operator!=( const nsCOMPtr<T>& lhs, const U* rhs )
   {
     return static_cast<const T*>(lhs.get()) != rhs;
   }
 template <class T, class U>
 inline
 bool
 operator!=( const U* lhs, const nsCOMPtr<T>& rhs )
   {
     return lhs != static_cast<const T*>(rhs.get());
   }
   // To avoid ambiguities caused by the presence of builtin |operator==|s
   // creating a situation where one of the |operator==| defined above
   // has a better conversion for one argument and the builtin has a
   // better conversion for the other argument, define additional
   // |operator==| without the |const| on the raw pointer.
   // See bug 65664 for details.
 #ifndef NSCAP_DONT_PROVIDE_NONCONST_OPEQ
 template <class T, class U>
 inline
 bool
 operator==( const nsCOMPtr<T>& lhs, U* rhs )
   {
     return static_cast<const T*>(lhs.get()) == const_cast<const U*>(rhs);
   }
 template <class T, class U>
 inline
 bool
 operator==( U* lhs, const nsCOMPtr<T>& rhs )
   {
     return const_cast<const U*>(lhs) == static_cast<const T*>(rhs.get());
   }
 template <class T, class U>
 inline
 bool
 operator!=( const nsCOMPtr<T>& lhs, U* rhs )
   {
     return static_cast<const T*>(lhs.get()) != const_cast<const U*>(rhs);
   }
 template <class T, class U>
 inline
 bool
 operator!=( U* lhs, const nsCOMPtr<T>& rhs )
   {
     return const_cast<const U*>(lhs) != static_cast<const T*>(rhs.get());
   }
 #endif
   // Comparing an |nsCOMPtr| to |0|
 class NSCAP_Zero;
 template <class T>
 inline
 bool
 operator==( const nsCOMPtr<T>& lhs, NSCAP_Zero* rhs )
     // specifically to allow |smartPtr == 0|
   {
     return static_cast<const void*>(lhs.get()) == reinterpret_cast<const void*>(rhs);
   }
 template <class T>
 inline
 bool
 operator==( NSCAP_Zero* lhs, const nsCOMPtr<T>& rhs )
     // specifically to allow |0 == smartPtr|
   {
     return reinterpret_cast<const void*>(lhs) == static_cast<const void*>(rhs.get());
   }
 template <class T>
 inline
 bool
 operator!=( const nsCOMPtr<T>& lhs, NSCAP_Zero* rhs )
     // specifically to allow |smartPtr != 0|
   {
     return static_cast<const void*>(lhs.get()) != reinterpret_cast<const void*>(rhs);
   }
 template <class T>
 inline
 bool
 operator!=( NSCAP_Zero* lhs, const nsCOMPtr<T>& rhs )
     // specifically to allow |0 != smartPtr|
   {
     return reinterpret_cast<const void*>(lhs) != static_cast<const void*>(rhs.get());
   }
 #ifdef HAVE_CPP_TROUBLE_COMPARING_TO_ZERO
   // We need to explicitly define comparison operators for `int'
   // because the compiler is lame.
 template <class T>
 inline
 bool
 operator==( const nsCOMPtr<T>& lhs, int rhs )
     // specifically to allow |smartPtr == 0|
   {
     return static_cast<const void*>(lhs.get()) == reinterpret_cast<const void*>(rhs);
   }
 template <class T>
 inline
 bool
 operator==( int lhs, const nsCOMPtr<T>& rhs )
     // specifically to allow |0 == smartPtr|
   {
     return reinterpret_cast<const void*>(lhs) == static_cast<const void*>(rhs.get());
   }
 #endif // !defined(HAVE_CPP_TROUBLE_COMPARING_TO_ZERO)
   // Comparing any two [XP]COM objects for identity
 inline
 bool
 SameCOMIdentity( nsISupports* lhs, nsISupports* rhs )
   {
     return nsCOMPtr<nsISupports>( do_QueryInterface(lhs) ) == nsCOMPtr<nsISupports>( do_QueryInterface(rhs) );
   }
 template <class SourceType, class DestinationType>
 inline
 nsresult
 CallQueryInterface( nsCOMPtr<SourceType>& aSourcePtr, DestinationType** aDestPtr )
   {
     return CallQueryInterface(aSourcePtr.get(), aDestPtr);
   }
 #endif // !defined(nsCOMPtr_h___)

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xpcom/glue/nsCOMPtr.h@129ffea94266 (annotated)

xpcom/glue/nsCOMPtr.h