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1327 lines
36 KiB
C++
1327 lines
36 KiB
C++
/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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/*
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* The contents of this file are subject to the Netscape Public
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* License Version 1.1 (the "License"); you may not use this file
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* except in compliance with the License. You may obtain a copy of
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* the License at http://www.mozilla.org/NPL/
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*
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* Software distributed under the License is distributed on an "AS
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* IS" basis, WITHOUT WARRANTY OF ANY KIND, either express or
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* implied. See the License for the specific language governing
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* rights and limitations under the License.
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*
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* The Original Code is mozilla.org code.
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*
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* The Initial Developer of the Original Code is Netscape
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* Communications Corporation. Portions created by Netscape are
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* Copyright (C) 1998 Netscape Communications Corporation. All
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* Rights Reserved.
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*
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* Contributor(s):
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* Scott Collins <scc@mozilla.org> (original author)
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* L. David Baron <dbaron@fas.harvard.edu>
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*/
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#ifndef nsCOMPtr_h___
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#define nsCOMPtr_h___
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/*
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Having problems?
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See the User Manual at:
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http://www.mozilla.org/projects/xpcom/nsCOMPtr.html
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nsCOMPtr
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better than a raw pointer
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for owning objects
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-- scc
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*/
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// Wrapping includes can speed up compiles (see "Large Scale C++ Software Design")
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#ifndef nsDebug_h___
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#include "nsDebug.h"
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// for |NS_PRECONDITION|
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#endif
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#ifndef nsISupports_h___
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#include "nsISupports.h"
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// for |nsresult|, |NS_ADDREF|, |NS_GET_IID| et al
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#endif
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#ifndef nscore_h__
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#include "nscore.h"
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// for |NS_..._CAST|, |NS_EXPORT|
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#endif
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/*
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WARNING:
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This file defines several macros for internal use only. These macros begin with the
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prefix |NSCAP_|. Do not use these macros in your own code. They are for internal use
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only for cross-platform compatibility, and are subject to change without notice.
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*/
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#ifdef _MSC_VER
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#define NSCAP_FEATURE_INLINE_STARTASSIGNMENT
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// under VC++, we win by inlining StartAssignment
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// Also under VC++, at the highest warning level, we are overwhelmed with warnings
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// about (unused) inline functions being removed. This is to be expected with
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// templates, so we disable the warning.
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#pragma warning( disable: 4514 )
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#endif
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#define NSCAP_FEATURE_FACTOR_DESTRUCTOR
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#ifdef NS_DEBUG
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#define NSCAP_FEATURE_TEST_DONTQUERY_CASES
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#define NSCAP_FEATURE_DEBUG_PTR_TYPES
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//#define NSCAP_FEATURE_TEST_NONNULL_QUERY_SUCCEEDS
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#endif
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/*
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|...TEST_DONTQUERY_CASES| and |...DEBUG_PTR_TYPES| introduce some code that is
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problematic on a select few of our platforms, e.g., QNX. Therefore, I'm providing
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a mechanism by which these features can be explicitly disabled from the command-line.
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*/
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#ifdef NSCAP_DISABLE_TEST_DONTQUERY_CASES
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#undef NSCAP_FEATURE_TEST_DONTQUERY_CASES
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#endif
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#if defined(NSCAP_DISABLE_DEBUG_PTR_TYPES) || !defined(NS_DEBUG)
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#undef NSCAP_FEATURE_DEBUG_PTR_TYPES
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#endif
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#ifdef NSCAP_FEATURE_DEBUG_PTR_TYPES
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#undef NSCAP_FEATURE_FACTOR_DESTRUCTOR
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#endif
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#ifdef HAVE_CPP_BOOL
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typedef bool NSCAP_BOOL;
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#else
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typedef PRBool NSCAP_BOOL;
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#endif
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/*
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The following three macros (|NSCAP_ADDREF|, |NSCAP_RELEASE|, and |NSCAP_LOG_ASSIGNMENT|)
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allow external clients the ability to add logging or other interesting debug facilities.
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In fact, if you want |nsCOMPtr| to participate in the standard logging facility, you
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provide (e.g., in "nsTraceRefcnt.h") suitable definitions
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#define NSCAP_ADDREF(this, ptr) NS_ADDREF(ptr)
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#define NSCAP_RELEASE(this, ptr) NS_RELEASE(ptr)
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*/
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#ifndef NSCAP_ADDREF
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#define NSCAP_ADDREF(this, ptr) (ptr)->AddRef()
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#endif
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#ifndef NSCAP_RELEASE
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#define NSCAP_RELEASE(this, ptr) (ptr)->Release()
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#endif
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// Clients can define |NSCAP_LOG_ASSIGNMENT| to perform logging.
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#ifdef NSCAP_LOG_ASSIGNMENT
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// Remember that |NSCAP_LOG_ASSIGNMENT| was defined by some client so that we know
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// to instantiate |~nsGetterAddRefs| in turn to note the external assignment into
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// the |nsCOMPtr|.
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#define NSCAP_LOG_EXTERNAL_ASSIGNMENT
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#else
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// ...otherwise, just strip it out of the code
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#define NSCAP_LOG_ASSIGNMENT(this, ptr);
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#endif
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/*
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WARNING:
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VC++4.2 is very picky. To compile under VC++4.2, the classes must be defined
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in an order that satisfies:
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nsDerivedSafe < nsCOMPtr
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already_AddRefed < nsCOMPtr
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nsCOMPtr < nsGetterAddRefs
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The other compilers probably won't complain, so please don't reorder these
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classes, on pain of breaking 4.2 compatibility.
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*/
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template <class T>
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class nsDerivedSafe : public T
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/*
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No client should ever see or have to type the name of this class. It is the
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artifact that makes it a compile-time error to call |AddRef| and |Release|
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on a |nsCOMPtr|. DO NOT USE THIS TYPE DIRECTLY IN YOUR CODE.
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See |nsCOMPtr::operator->|, |nsCOMPtr::operator*|, et al.
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This type should be a nested class inside |nsCOMPtr<T>|.
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*/
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{
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private:
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#ifdef HAVE_CPP_ACCESS_CHANGING_USING
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using T::AddRef;
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using T::Release;
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#else
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NS_IMETHOD_(nsrefcnt) AddRef(void);
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NS_IMETHOD_(nsrefcnt) Release(void);
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#endif
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#if !defined(XP_OS2_VACPP) && !defined(AIX)
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void operator delete( void*, size_t ); // NOT TO BE IMPLEMENTED
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// declaring |operator delete| private makes calling delete on an interface pointer a compile error
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#endif
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nsDerivedSafe<T>& operator=( const T& ); // NOT TO BE IMPLEMENTED
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// you may not call |operator=()| through a dereferenced |nsCOMPtr|, because you'd get the wrong one
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/*
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Compiler warnings and errors: nsDerivedSafe operator=() hides inherited operator=().
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If you see that, that means somebody checked in a [XP]COM interface class that declares an
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|operator=()|, and that's _bad_. So bad, in fact, that this declaration exists explicitly
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to stop people from doing it.
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*/
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};
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#if !defined(HAVE_CPP_ACCESS_CHANGING_USING) && defined(NEED_CPP_UNUSED_IMPLEMENTATIONS)
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template <class T>
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nsrefcnt
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nsDerivedSafe<T>::AddRef()
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{
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return 0;
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}
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template <class T>
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nsrefcnt
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nsDerivedSafe<T>::Release()
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{
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return 0;
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}
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#endif
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template <class T>
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struct already_AddRefed
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/*
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...cooperates with |nsCOMPtr| to allow you to assign in a pointer _without_
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|AddRef|ing it. You might want to use this as a return type from a function
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that produces an already |AddRef|ed pointer as a result.
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See also |getter_AddRefs()|, |dont_AddRef()|, and |class nsGetterAddRefs|.
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This type should be a nested class inside |nsCOMPtr<T>|.
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Yes, |already_AddRefed| could have been implemented as an |nsCOMPtr_helper| to
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avoid adding specialized machinery to |nsCOMPtr| ... but this is the simplest
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case, and perhaps worth the savings in time and space that its specific
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implementation affords over the more general solution offered by
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|nsCOMPtr_helper|.
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*/
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{
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already_AddRefed( T* aRawPtr )
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: mRawPtr(aRawPtr)
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{
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// nothing else to do here
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}
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T* get() const { return mRawPtr; }
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T* mRawPtr;
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};
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template <class T>
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inline
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const already_AddRefed<T>
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getter_AddRefs( T* aRawPtr )
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/*
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...makes typing easier, because it deduces the template type, e.g.,
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you write |dont_AddRef(fooP)| instead of |already_AddRefed<IFoo>(fooP)|.
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*/
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{
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return already_AddRefed<T>(aRawPtr);
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}
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template <class T>
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inline
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const already_AddRefed<T>
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getter_AddRefs( const already_AddRefed<T>& aAlreadyAddRefedPtr )
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{
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return aAlreadyAddRefedPtr;
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}
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template <class T>
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inline
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const already_AddRefed<T>
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dont_AddRef( T* aRawPtr )
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{
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return already_AddRefed<T>(aRawPtr);
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}
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template <class T>
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inline
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const already_AddRefed<T>
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dont_AddRef( const already_AddRefed<T> aAlreadyAddRefedPtr )
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{
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return aAlreadyAddRefedPtr;
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}
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/*
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There used to be machinery to allow |dont_QueryInterface()| to work, but
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since it is now equivalent to using a raw pointer ... all that machinery
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has gone away. For pointer arguments, the following definition should
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optimize away. This is better than using a |#define| because it is
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scoped.
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*/
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template <class T>
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inline
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T*
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dont_QueryInterface( T* expr )
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{
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return expr;
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}
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class nsCOMPtr_helper
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/*
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An |nsCOMPtr_helper| transforms commonly called getters into typesafe forms
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that are more convenient to call, and more efficient to use with |nsCOMPtr|s.
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Good candidates for helpers are |QueryInterface()|, |CreateInstance()|, etc.
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Here are the rules for a helper:
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- it implements |operator()| to produce an interface pointer
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- (except for its name) |operator()| is a valid [XP]COM `getter'
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- the interface pointer that it returns is already |AddRef()|ed (as from any good getter)
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- it matches the type requested with the supplied |nsIID| argument
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- its constructor provides an optional |nsresult*| that |operator()| can fill
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in with an error when it is executed
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See |class nsQueryInterface| for an example.
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*/
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{
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public:
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virtual nsresult operator()( const nsIID&, void** ) const = 0;
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};
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class NS_COM nsQueryInterface : public nsCOMPtr_helper
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{
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public:
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nsQueryInterface( nsISupports* aRawPtr, nsresult* error )
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: mRawPtr(aRawPtr),
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mErrorPtr(error)
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{
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// nothing else to do here
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}
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virtual nsresult operator()( const nsIID& aIID, void** ) const;
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private:
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nsISupports* mRawPtr;
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nsresult* mErrorPtr;
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};
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inline
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const nsQueryInterface
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do_QueryInterface( nsISupports* aRawPtr, nsresult* error = 0 )
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{
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return nsQueryInterface(aRawPtr, error);
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}
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template <class T>
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inline
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void
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do_QueryInterface( already_AddRefed<T>& )
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{
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// This signature exists soley to _stop_ you from doing the bad thing.
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// Saying |do_QueryInterface()| on a pointer that is not otherwise owned by
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// someone else is an automatic leak. See <http://bugzilla.mozilla.org/show_bug.cgi?id=8221>.
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}
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template <class T>
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inline
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void
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do_QueryInterface( already_AddRefed<T>&, nsresult* )
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{
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// This signature exists soley to _stop_ you from doing the bad thing.
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// Saying |do_QueryInterface()| on a pointer that is not otherwise owned by
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// someone else is an automatic leak. See <http://bugzilla.mozilla.org/show_bug.cgi?id=8221>.
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}
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/**
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* |null_nsCOMPtr| is deprecated. Please use the value |0| instead.
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* |#define|s are bad, because they aren't scoped. But I can't replace
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* this definition with an inline, because only a compile-time |0| gets
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* magically converted to arbitrary pointer types. This doesn't automatically
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* happen for just any |const int| with the value |0|.
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*
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* Ergo: we really want to eliminate all uses of |null_nsCOMPtr()| in favor of
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* |0|.
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*/
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#define null_nsCOMPtr() (0)
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class nsCOMPtr_base
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/*
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...factors implementation for all template versions of |nsCOMPtr|.
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This should really be an |nsCOMPtr<nsISupports>|, but this wouldn't work
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because unlike the
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Here's the way people normally do things like this
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template <class T> class Foo { ... };
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template <> class Foo<void*> { ... };
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template <class T> class Foo<T*> : private Foo<void*> { ... };
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*/
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{
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public:
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nsCOMPtr_base( nsISupports* rawPtr = 0 )
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: mRawPtr(rawPtr)
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{
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// nothing else to do here
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}
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#ifdef NSCAP_FEATURE_FACTOR_DESTRUCTOR
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NS_EXPORT ~nsCOMPtr_base();
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#else
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// Allow debug builds to link with optimized versions of nsCOMPtr-using
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// plugins (e.g., JVMs).
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NS_EXPORT ~nsCOMPtr_base() { }
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#endif
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NS_EXPORT void assign_with_AddRef( nsISupports* );
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NS_EXPORT void assign_from_helper( const nsCOMPtr_helper&, const nsIID& );
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NS_EXPORT void** begin_assignment();
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protected:
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nsISupports* mRawPtr;
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void
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assign_assuming_AddRef( nsISupports* newPtr )
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{
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/*
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|AddRef()|ing the new value (before entering this function) before
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|Release()|ing the old lets us safely ignore the self-assignment case.
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We must, however, be careful only to |Release()| _after_ doing the
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assignment, in case the |Release()| leads to our _own_ destruction,
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which would, in turn, cause an incorrect second |Release()| of our old
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pointer. Thank <waterson@netscape.com> for discovering this.
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*/
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nsISupports* oldPtr = mRawPtr;
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mRawPtr = newPtr;
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NSCAP_LOG_ASSIGNMENT(this, newPtr);
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if ( oldPtr )
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NSCAP_RELEASE(this, oldPtr);
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}
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};
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// template <class T> class nsGetterAddRefs;
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template <class T>
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class nsCOMPtr
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#ifndef NSCAP_FEATURE_DEBUG_PTR_TYPES
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: private nsCOMPtr_base
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#endif
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{
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enum { _force_even_compliant_compilers_to_fail_ = sizeof(T) };
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/*
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The declaration above exists specifically to make |nsCOMPtr<T>| _not_ compile with only
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a forward declaration of |T|. This should prevent Windows and Mac engineers from
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breaking Solaris and other compilers that naturally have this behavior. Thank
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<law@netscape.com> for inventing this specific trick.
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Of course, if you're using |nsCOMPtr| outside the scope of wanting to compile on
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Solaris and old GCC, you probably want to remove the enum so you can exploit forward
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declarations.
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*/
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#ifdef NSCAP_FEATURE_DEBUG_PTR_TYPES
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private:
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void assign_with_AddRef( nsISupports* );
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void assign_from_helper( const nsCOMPtr_helper&, const nsIID& );
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void** begin_assignment();
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void
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assign_assuming_AddRef( T* newPtr )
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{
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T* oldPtr = mRawPtr;
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mRawPtr = newPtr;
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NSCAP_LOG_ASSIGNMENT(this, newPtr);
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if ( oldPtr )
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NSCAP_RELEASE(this, oldPtr);
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}
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private:
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T* mRawPtr;
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#define NSCAP_CTOR_BASE(x) mRawPtr(x)
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#else
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#define NSCAP_CTOR_BASE(x) nsCOMPtr_base(x)
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#endif
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public:
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typedef T element_type;
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|
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#ifndef NSCAP_FEATURE_FACTOR_DESTRUCTOR
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~nsCOMPtr()
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{
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if ( mRawPtr )
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NSCAP_RELEASE(this, mRawPtr);
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}
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|
#endif
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|
|
#ifdef NSCAP_FEATURE_TEST_DONTQUERY_CASES
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void
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Assert_NoQueryNeeded()
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{
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|
if ( mRawPtr )
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{
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nsCOMPtr<T> query_result( do_QueryInterface(mRawPtr) );
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NS_ASSERTION(query_result.get() == mRawPtr, "QueryInterface needed");
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}
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}
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#define NSCAP_ASSERT_NO_QUERY_NEEDED() Assert_NoQueryNeeded();
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#else
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#define NSCAP_ASSERT_NO_QUERY_NEEDED()
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#endif
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|
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// Constructors
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nsCOMPtr()
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: NSCAP_CTOR_BASE(0)
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// default constructor
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{
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NSCAP_LOG_ASSIGNMENT(this, 0);
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}
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|
nsCOMPtr( const nsCOMPtr<T>& aSmartPtr )
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: NSCAP_CTOR_BASE(aSmartPtr.mRawPtr)
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// copy-constructor
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|
{
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if ( mRawPtr )
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NSCAP_ADDREF(this, mRawPtr);
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NSCAP_LOG_ASSIGNMENT(this, aSmartPtr.mRawPtr);
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}
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nsCOMPtr( T* aRawPtr )
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: NSCAP_CTOR_BASE(aRawPtr)
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|
// construct from a raw pointer (of the right type)
|
|
{
|
|
if ( mRawPtr )
|
|
NSCAP_ADDREF(this, mRawPtr);
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|
NSCAP_LOG_ASSIGNMENT(this, aRawPtr);
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NSCAP_ASSERT_NO_QUERY_NEEDED();
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}
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|
|
nsCOMPtr( const already_AddRefed<T>& aSmartPtr )
|
|
: NSCAP_CTOR_BASE(aSmartPtr.mRawPtr)
|
|
// construct from |dont_AddRef(expr)|
|
|
{
|
|
NSCAP_LOG_ASSIGNMENT(this, aSmartPtr.mRawPtr);
|
|
NSCAP_ASSERT_NO_QUERY_NEEDED();
|
|
}
|
|
|
|
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_IID(T));
|
|
NSCAP_ASSERT_NO_QUERY_NEEDED();
|
|
}
|
|
|
|
#ifdef NSCAP_FEATURE_TEST_DONTQUERY_CASES
|
|
// For debug only --- this particular helper doesn't need to do the
|
|
// |NSCAP_ASSERT_NO_QUERY_NEEDED()| test. In fact, with the logging
|
|
// changes, skipping the query test prevents infinite recursion.
|
|
nsCOMPtr( const nsQueryInterface& helper )
|
|
: NSCAP_CTOR_BASE(0)
|
|
{
|
|
NSCAP_LOG_ASSIGNMENT(this, 0);
|
|
assign_from_helper(helper, NS_GET_IID(T));
|
|
}
|
|
#endif
|
|
|
|
|
|
// 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;
|
|
}
|
|
|
|
nsCOMPtr<T>&
|
|
operator=( const already_AddRefed<T>& rhs )
|
|
// assign from |dont_AddRef(expr)|
|
|
{
|
|
assign_assuming_AddRef(rhs.mRawPtr);
|
|
NSCAP_ASSERT_NO_QUERY_NEEDED();
|
|
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_IID(T));
|
|
NSCAP_ASSERT_NO_QUERY_NEEDED();
|
|
return *this;
|
|
}
|
|
|
|
#ifdef NSCAP_FEATURE_TEST_DONTQUERY_CASES
|
|
// For debug only --- this particular helper doesn't need to do the
|
|
// |NSCAP_ASSERT_NO_QUERY_NEEDED()| test. In fact, with the logging
|
|
// changes, skipping the query test prevents infinite recursion.
|
|
nsCOMPtr<T>&
|
|
operator=( const nsQueryInterface& rhs )
|
|
{
|
|
assign_from_helper(rhs, NS_GET_IID(T));
|
|
return *this;
|
|
}
|
|
#endif
|
|
|
|
|
|
// Other pointer operators
|
|
|
|
nsDerivedSafe<T>*
|
|
get() const
|
|
/*
|
|
Prefer the implicit conversion provided automatically by |operator nsDerivedSafe<T>*() const|.
|
|
Use |get()| _only_ to resolve ambiguity.
|
|
|
|
Returns a |nsDerivedSafe<T>*| to deny clients the use of |AddRef| and |Release|.
|
|
*/
|
|
{
|
|
return NS_REINTERPRET_CAST(nsDerivedSafe<T>*, mRawPtr);
|
|
}
|
|
|
|
operator nsDerivedSafe<T>*() const
|
|
/*
|
|
...makes an |nsCOMPtr| act like its underlying raw pointer type (except against |AddRef()|, |Release()|,
|
|
and |delete|) 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();
|
|
}
|
|
|
|
nsDerivedSafe<T>*
|
|
operator->() const
|
|
{
|
|
NS_PRECONDITION(mRawPtr != 0, "You can't dereference a NULL nsCOMPtr with operator->().");
|
|
return get();
|
|
}
|
|
|
|
#ifdef CANT_RESOLVE_CPP_CONST_AMBIGUITY
|
|
// broken version for IRIX
|
|
|
|
nsCOMPtr<T>*
|
|
get_address() const
|
|
// This is not intended to be used by clients. See |address_of|
|
|
// below.
|
|
{
|
|
return NS_CONST_CAST(nsCOMPtr<T>*, this);
|
|
}
|
|
|
|
#else // CANT_RESOLVE_CPP_CONST_AMBIGUITY
|
|
|
|
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;
|
|
}
|
|
|
|
#endif // CANT_RESOLVE_CPP_CONST_AMBIGUITY
|
|
|
|
// This is going to become private soon, once all users of
|
|
// nsCOMPtr stop using it. It may even become:
|
|
// void operator&() const {}
|
|
private:
|
|
const nsCOMPtr<T>*
|
|
operator&() const
|
|
// This is private to prevent accidental use of |operator&|
|
|
// instead of |getter_AddRefs|, which can happen if the result
|
|
// is cast.
|
|
|
|
// To pass an nsCOMPtr as an out parameter to a function, either
|
|
// (preferably) pass by reference or use |address_of|.
|
|
{
|
|
return this;
|
|
}
|
|
|
|
nsCOMPtr<T>*
|
|
operator&()
|
|
// This version is also needed so things will compile before
|
|
// all the uses are removed and we make it private. After it's
|
|
// private, we won't need two anymore.
|
|
{
|
|
return this;
|
|
}
|
|
|
|
public:
|
|
nsDerivedSafe<T>&
|
|
operator*() const
|
|
{
|
|
NS_PRECONDITION(mRawPtr != 0, "You can't dereference a NULL nsCOMPtr with operator*().");
|
|
return *get();
|
|
}
|
|
|
|
#if 0
|
|
private:
|
|
friend class nsGetterAddRefs<T>;
|
|
#endif
|
|
|
|
T**
|
|
StartAssignment()
|
|
{
|
|
#ifndef NSCAP_FEATURE_INLINE_STARTASSIGNMENT
|
|
return NS_REINTERPRET_CAST(T**, begin_assignment());
|
|
#else
|
|
assign_assuming_AddRef(0);
|
|
return NS_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.
|
|
*/
|
|
|
|
NS_SPECIALIZE_TEMPLATE
|
|
class nsCOMPtr<nsISupports>
|
|
: private nsCOMPtr_base
|
|
{
|
|
public:
|
|
typedef nsISupports element_type;
|
|
|
|
#ifndef NSCAP_FEATURE_FACTOR_DESTRUCTOR
|
|
~nsCOMPtr()
|
|
{
|
|
if ( mRawPtr )
|
|
NSCAP_RELEASE(this, mRawPtr);
|
|
}
|
|
#endif
|
|
|
|
|
|
// 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( const already_AddRefed<nsISupports>& aSmartPtr )
|
|
: nsCOMPtr_base(aSmartPtr.mRawPtr)
|
|
// construct from |dont_AddRef(expr)|
|
|
{
|
|
NSCAP_LOG_ASSIGNMENT(this, aSmartPtr.mRawPtr);
|
|
}
|
|
|
|
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=( const already_AddRefed<nsISupports>& rhs )
|
|
// assign from |dont_AddRef(expr)|
|
|
{
|
|
assign_assuming_AddRef(rhs.mRawPtr);
|
|
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;
|
|
}
|
|
|
|
|
|
// Other pointer operators
|
|
|
|
nsDerivedSafe<nsISupports>*
|
|
get() const
|
|
/*
|
|
Prefer the implicit conversion provided automatically by |operator nsDerivedSafe<nsISupports>*() const|.
|
|
Use |get()| _only_ to resolve ambiguity.
|
|
|
|
Returns a |nsDerivedSafe<nsISupports>*| to deny clients the use of |AddRef| and |Release|.
|
|
*/
|
|
{
|
|
return NS_REINTERPRET_CAST(nsDerivedSafe<nsISupports>*, mRawPtr);
|
|
}
|
|
|
|
operator nsDerivedSafe<nsISupports>*() const
|
|
/*
|
|
...makes an |nsCOMPtr| act like its underlying raw pointer type (except against |AddRef()|, |Release()|,
|
|
and |delete|) 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();
|
|
}
|
|
|
|
nsDerivedSafe<nsISupports>*
|
|
operator->() const
|
|
{
|
|
NS_PRECONDITION(mRawPtr != 0, "You can't dereference a NULL nsCOMPtr with operator->().");
|
|
return get();
|
|
}
|
|
|
|
#ifdef CANT_RESOLVE_CPP_CONST_AMBIGUITY
|
|
// broken version for IRIX
|
|
|
|
nsCOMPtr<nsISupports>*
|
|
get_address() const
|
|
// This is not intended to be used by clients. See |address_of|
|
|
// below.
|
|
{
|
|
return NS_CONST_CAST(nsCOMPtr<nsISupports>*, this);
|
|
}
|
|
|
|
#else // CANT_RESOLVE_CPP_CONST_AMBIGUITY
|
|
|
|
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;
|
|
}
|
|
|
|
#endif // CANT_RESOLVE_CPP_CONST_AMBIGUITY
|
|
|
|
// This is going to become private soon, once all users of
|
|
// nsCOMPtr stop using it. It may even become:
|
|
// void operator&() const {}
|
|
private:
|
|
const nsCOMPtr<nsISupports>*
|
|
operator&() const
|
|
// This is private to prevent accidental use of |operator&|
|
|
// instead of |getter_AddRefs|, which can happen if the result
|
|
// is cast.
|
|
|
|
// To pass an nsCOMPtr as an out parameter to a function, either
|
|
// (preferably) pass by reference or use |address_of|.
|
|
{
|
|
return this;
|
|
}
|
|
|
|
nsCOMPtr<nsISupports>*
|
|
operator&()
|
|
// This version is also needed so things will compile before
|
|
// all the uses are removed and we make it private. After it's
|
|
// private, we won't need two anymore.
|
|
{
|
|
return this;
|
|
}
|
|
|
|
public:
|
|
|
|
nsDerivedSafe<nsISupports>&
|
|
operator*() const
|
|
{
|
|
NS_PRECONDITION(mRawPtr != 0, "You can't dereference a NULL nsCOMPtr with operator*().");
|
|
return *get();
|
|
}
|
|
|
|
#if 0
|
|
private:
|
|
friend class nsGetterAddRefs<nsISupports>;
|
|
#endif
|
|
|
|
nsISupports**
|
|
StartAssignment()
|
|
{
|
|
#ifndef NSCAP_FEATURE_INLINE_STARTASSIGNMENT
|
|
return NS_REINTERPRET_CAST(nsISupports**, begin_assignment());
|
|
#else
|
|
assign_assuming_AddRef(0);
|
|
return NS_REINTERPRET_CAST(nsISupports**, &mRawPtr);
|
|
#endif
|
|
}
|
|
};
|
|
|
|
#ifdef NSCAP_FEATURE_DEBUG_PTR_TYPES
|
|
template <class T>
|
|
void
|
|
nsCOMPtr<T>::assign_with_AddRef( nsISupports* rawPtr )
|
|
{
|
|
if ( rawPtr )
|
|
NSCAP_ADDREF(this, rawPtr);
|
|
assign_assuming_AddRef(NS_REINTERPRET_CAST(T*, rawPtr));
|
|
}
|
|
|
|
template <class T>
|
|
void
|
|
nsCOMPtr<T>::assign_from_helper( const nsCOMPtr_helper& helper, const nsIID& aIID )
|
|
{
|
|
T* newRawPtr;
|
|
if ( !NS_SUCCEEDED( helper(aIID, NS_REINTERPRET_CAST(void**, &newRawPtr)) ) )
|
|
newRawPtr = 0;
|
|
assign_assuming_AddRef(newRawPtr);
|
|
}
|
|
|
|
template <class T>
|
|
void**
|
|
nsCOMPtr<T>::begin_assignment()
|
|
{
|
|
assign_assuming_AddRef(0);
|
|
return NS_REINTERPRET_CAST(void**, &mRawPtr);
|
|
}
|
|
#endif
|
|
|
|
#ifdef CANT_RESOLVE_CPP_CONST_AMBIGUITY
|
|
|
|
// This is the broken version for IRIX, which can't handle the version below.
|
|
|
|
template <class T>
|
|
inline
|
|
nsCOMPtr<T>*
|
|
address_of( const nsCOMPtr<T>& aPtr )
|
|
{
|
|
return aPtr.get_address();
|
|
}
|
|
|
|
#else // CANT_RESOLVE_CPP_CONST_AMBIGUITY
|
|
|
|
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();
|
|
}
|
|
|
|
#endif // CANT_RESOLVE_CPP_CONST_AMBIGUITY
|
|
|
|
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(NS_REINTERPRET_CAST(void *, address_of(mTargetSmartPtr)), mTargetSmartPtr.get());
|
|
#endif
|
|
|
|
#ifdef NSCAP_FEATURE_TEST_DONTQUERY_CASES
|
|
mTargetSmartPtr.Assert_NoQueryNeeded();
|
|
#endif
|
|
}
|
|
#endif
|
|
|
|
operator void**()
|
|
{
|
|
return NS_REINTERPRET_CAST(void**, mTargetSmartPtr.StartAssignment());
|
|
}
|
|
|
|
operator nsISupports**()
|
|
{
|
|
return NS_REINTERPRET_CAST(nsISupports**, mTargetSmartPtr.StartAssignment());
|
|
}
|
|
|
|
operator T**()
|
|
{
|
|
return mTargetSmartPtr.StartAssignment();
|
|
}
|
|
|
|
T*&
|
|
operator*()
|
|
{
|
|
return *(mTargetSmartPtr.StartAssignment());
|
|
}
|
|
|
|
private:
|
|
nsCOMPtr<T>& mTargetSmartPtr;
|
|
};
|
|
|
|
|
|
NS_SPECIALIZE_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(NS_REINTERPRET_CAST(void *, address_of(mTargetSmartPtr)), mTargetSmartPtr.get());
|
|
}
|
|
#endif
|
|
|
|
operator void**()
|
|
{
|
|
return NS_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);
|
|
}
|
|
|
|
|
|
|
|
// Comparing two |nsCOMPtr|s
|
|
|
|
template <class T, class U>
|
|
inline
|
|
NSCAP_BOOL
|
|
operator==( const nsCOMPtr<T>& lhs, const nsCOMPtr<U>& rhs )
|
|
{
|
|
return NS_STATIC_CAST(const void*, lhs.get()) == NS_STATIC_CAST(const void*, rhs.get());
|
|
}
|
|
|
|
|
|
template <class T, class U>
|
|
inline
|
|
NSCAP_BOOL
|
|
operator!=( const nsCOMPtr<T>& lhs, const nsCOMPtr<U>& rhs )
|
|
{
|
|
return NS_STATIC_CAST(const void*, lhs.get()) != NS_STATIC_CAST(const void*, rhs.get());
|
|
}
|
|
|
|
|
|
// Comparing an |nsCOMPtr| to a raw pointer
|
|
|
|
template <class T, class U>
|
|
inline
|
|
NSCAP_BOOL
|
|
operator==( const nsCOMPtr<T>& lhs, const U* rhs )
|
|
{
|
|
return NS_STATIC_CAST(const void*, lhs.get()) == NS_STATIC_CAST(const void*, rhs);
|
|
}
|
|
|
|
template <class T, class U>
|
|
inline
|
|
NSCAP_BOOL
|
|
operator==( const U* lhs, const nsCOMPtr<T>& rhs )
|
|
{
|
|
return NS_STATIC_CAST(const void*, lhs) == NS_STATIC_CAST(const void*, rhs.get());
|
|
}
|
|
|
|
template <class T, class U>
|
|
inline
|
|
NSCAP_BOOL
|
|
operator!=( const nsCOMPtr<T>& lhs, const U* rhs )
|
|
{
|
|
return NS_STATIC_CAST(const void*, lhs.get()) != NS_STATIC_CAST(const void*, rhs);
|
|
}
|
|
|
|
template <class T, class U>
|
|
inline
|
|
NSCAP_BOOL
|
|
operator!=( const U* lhs, const nsCOMPtr<T>& rhs )
|
|
{
|
|
return NS_STATIC_CAST(const void*, lhs) != NS_STATIC_CAST(const void*, 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.
|
|
|
|
// This is defined by an autoconf test, but VC++ also has a bug that
|
|
// prevents us from using these. (It also, fortunately, has the bug
|
|
// that we don't need them either.)
|
|
#ifdef _MSC_VER
|
|
#define NSCAP_DONT_PROVIDE_NONCONST_OPEQ
|
|
#endif
|
|
|
|
#ifndef NSCAP_DONT_PROVIDE_NONCONST_OPEQ
|
|
template <class T, class U>
|
|
inline
|
|
NSCAP_BOOL
|
|
operator==( const nsCOMPtr<T>& lhs, U* rhs )
|
|
{
|
|
return NS_STATIC_CAST(const void*, lhs.get()) == NS_STATIC_CAST(void*, rhs);
|
|
}
|
|
|
|
template <class T, class U>
|
|
inline
|
|
NSCAP_BOOL
|
|
operator==( U* lhs, const nsCOMPtr<T>& rhs )
|
|
{
|
|
return NS_STATIC_CAST(void*, lhs) == NS_STATIC_CAST(const void*, rhs.get());
|
|
}
|
|
|
|
template <class T, class U>
|
|
inline
|
|
NSCAP_BOOL
|
|
operator!=( const nsCOMPtr<T>& lhs, U* rhs )
|
|
{
|
|
return NS_STATIC_CAST(const void*, lhs.get()) != NS_STATIC_CAST(void*, rhs);
|
|
}
|
|
|
|
template <class T, class U>
|
|
inline
|
|
NSCAP_BOOL
|
|
operator!=( U* lhs, const nsCOMPtr<T>& rhs )
|
|
{
|
|
return NS_STATIC_CAST(void*, lhs) != NS_STATIC_CAST(const void*, rhs.get());
|
|
}
|
|
#endif
|
|
|
|
|
|
|
|
// Comparing an |nsCOMPtr| to |0|
|
|
|
|
class NSCAP_Zero;
|
|
|
|
template <class T>
|
|
inline
|
|
NSCAP_BOOL
|
|
operator==( const nsCOMPtr<T>& lhs, NSCAP_Zero* rhs )
|
|
// specifically to allow |smartPtr == 0|
|
|
{
|
|
return NS_STATIC_CAST(const void*, lhs.get()) == NS_REINTERPRET_CAST(const void*, rhs);
|
|
}
|
|
|
|
template <class T>
|
|
inline
|
|
NSCAP_BOOL
|
|
operator==( NSCAP_Zero* lhs, const nsCOMPtr<T>& rhs )
|
|
// specifically to allow |0 == smartPtr|
|
|
{
|
|
return NS_REINTERPRET_CAST(const void*, lhs) == NS_STATIC_CAST(const void*, rhs.get());
|
|
}
|
|
|
|
template <class T>
|
|
inline
|
|
NSCAP_BOOL
|
|
operator!=( const nsCOMPtr<T>& lhs, NSCAP_Zero* rhs )
|
|
// specifically to allow |smartPtr != 0|
|
|
{
|
|
return NS_STATIC_CAST(const void*, lhs.get()) != NS_REINTERPRET_CAST(const void*, rhs);
|
|
}
|
|
|
|
template <class T>
|
|
inline
|
|
NSCAP_BOOL
|
|
operator!=( NSCAP_Zero* lhs, const nsCOMPtr<T>& rhs )
|
|
// specifically to allow |0 != smartPtr|
|
|
{
|
|
return NS_REINTERPRET_CAST(const void*, lhs) != NS_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
|
|
NSCAP_BOOL
|
|
operator==( const nsCOMPtr<T>& lhs, int rhs )
|
|
// specifically to allow |smartPtr == 0|
|
|
{
|
|
return NS_STATIC_CAST(const void*, lhs.get()) == NS_REINTERPRET_CAST(const void*, rhs);
|
|
}
|
|
|
|
template <class T>
|
|
inline
|
|
NSCAP_BOOL
|
|
operator==( int lhs, const nsCOMPtr<T>& rhs )
|
|
// specifically to allow |0 == smartPtr|
|
|
{
|
|
return NS_REINTERPRET_CAST(const void*, lhs) == NS_STATIC_CAST(const void*, rhs.get());
|
|
}
|
|
|
|
#endif // !defined(HAVE_CPP_TROUBLE_COMPARING_TO_ZERO)
|
|
|
|
// Comparing any two [XP]COM objects for identity
|
|
|
|
inline
|
|
NSCAP_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___)
|