зеркало из https://github.com/mozilla/pjs.git
993 строки
26 KiB
C++
993 строки
26 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@netscape.com>
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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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*/
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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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/*
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Set up some |#define|s to turn off a couple of troublesome C++ features.
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Interestingly, none of the compilers barf on template stuff. These are set up automatically
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by the autoconf system for all Unixes. (Temporarily, I hope) I have to define them
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myself for Mac and Windows.
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*/
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// under Metrowerks (Mac), we don't have autoconf yet
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#ifdef __MWERKS__
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#define HAVE_CPP_USING
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#define HAVE_CPP_EXPLICIT
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#define HAVE_CPP_BOOL
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#endif
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// under VC++ (Windows), we don't have autoconf yet
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#ifdef _MSC_VER
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#define HAVE_CPP_EXPLICIT
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#define HAVE_CPP_USING
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#if (_MSC_VER<1100)
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// before 5.0, VC++ couldn't handle explicit
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#undef HAVE_CPP_EXPLICIT
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#elif (_MSC_VER==1100)
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// VC++5.0 has an internal compiler error (sometimes) without this
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#undef HAVE_CPP_USING
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#endif
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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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#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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/*
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If the compiler doesn't support |explicit|, we'll just make it go away, trusting
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that the builds under compilers that do have it will keep us on the straight and narrow.
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*/
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#ifndef HAVE_CPP_EXPLICIT
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#define explicit
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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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#ifdef NSCAP_FEATURE_DEBUG_MACROS
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#define NSCAP_ADDREF(ptr) NS_ADDREF(ptr)
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#define NSCAP_RELEASE(ptr) NS_RELEASE(ptr)
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#else
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#define NSCAP_ADDREF(ptr) (ptr)->AddRef()
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#define NSCAP_RELEASE(ptr) (ptr)->Release()
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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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nsDontAddRef < 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_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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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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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_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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/*
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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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- that interface pointer 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_EXPORT 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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/**
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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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template <class T>
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struct nsDontAddRef
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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 would rarely use this directly, but rather through the
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machinery of |getter_AddRefs| in the argument list to functions that |AddRef|
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their results before returning them to the caller.
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DO NOT USE THIS TYPE DIRECTLY IN YOUR CODE. Use |getter_AddRefs()| or
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|dont_AddRef()| instead.
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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, |nsDontAddRef| 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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explicit
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nsDontAddRef( 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* mRawPtr;
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};
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template <class T>
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inline
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const nsDontAddRef<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 |nsDontAddRef<IFoo>(fooP)|.
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*/
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{
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return nsDontAddRef<T>(aRawPtr);
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}
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template <class T>
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inline
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const nsDontAddRef<T>
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dont_AddRef( T* aRawPtr )
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{
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return nsDontAddRef<T>(aRawPtr);
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}
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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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#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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if ( oldPtr )
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NSCAP_RELEASE(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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#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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if ( oldPtr )
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NSCAP_RELEASE(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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#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(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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T* query_result = 0;
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nsresult status = CallQueryInterface(mRawPtr, &query_result);
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NS_ASSERTION(query_result == mRawPtr, "QueryInterface needed");
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if ( NS_SUCCEEDED(status) )
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NSCAP_RELEASE(query_result);
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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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// 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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// nothing else to do here
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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(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)
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{
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if ( mRawPtr )
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NSCAP_ADDREF(mRawPtr);
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NSCAP_ASSERT_NO_QUERY_NEEDED();
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}
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nsCOMPtr( const nsDontAddRef<T>& aSmartPtr )
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: NSCAP_CTOR_BASE(aSmartPtr.mRawPtr)
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// construct from |dont_AddRef(expr)|
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{
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NSCAP_ASSERT_NO_QUERY_NEEDED();
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}
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nsCOMPtr( const nsCOMPtr_helper& helper )
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: NSCAP_CTOR_BASE(0)
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// ...and finally, anything else we might need to construct from
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// can exploit the |nsCOMPtr_helper| facility
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{
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assign_from_helper(helper, NS_GET_IID(T));
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NSCAP_ASSERT_NO_QUERY_NEEDED();
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}
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// Assignment operators
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nsCOMPtr<T>&
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operator=( const nsCOMPtr<T>& rhs )
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// copy assignment operator
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{
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assign_with_AddRef(rhs.mRawPtr);
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return *this;
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}
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nsCOMPtr<T>&
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operator=( T* rhs )
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// assign from a raw pointer (of the right type)
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{
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assign_with_AddRef(rhs);
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NSCAP_ASSERT_NO_QUERY_NEEDED();
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return *this;
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}
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nsCOMPtr<T>&
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operator=( const nsDontAddRef<T>& rhs )
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// assign from |dont_AddRef(expr)|
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{
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assign_assuming_AddRef(rhs.mRawPtr);
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NSCAP_ASSERT_NO_QUERY_NEEDED();
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return *this;
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}
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nsCOMPtr<T>&
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operator=( const nsCOMPtr_helper& rhs )
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// ...and finally, anything else we might need to assign from
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// can exploit the |nsCOMPtr_helper| facility.
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{
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assign_from_helper(rhs, NS_GET_IID(T));
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NSCAP_ASSERT_NO_QUERY_NEEDED();
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return *this;
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}
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// Other pointer operators
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|
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nsDerivedSafe<T>*
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get() const
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/*
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Prefer the implicit conversion provided automatically by |operator nsDerivedSafe<nsISupports*() const|.
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Use |get()| _only_ to resolve ambiguity.
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|
|
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();
|
|
}
|
|
|
|
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
|
|
*/
|
|
|
|
// template <>
|
|
class nsCOMPtr<nsISupports>
|
|
: private nsCOMPtr_base
|
|
{
|
|
public:
|
|
typedef nsISupports element_type;
|
|
|
|
#ifndef NSCAP_FEATURE_FACTOR_DESTRUCTOR
|
|
~nsCOMPtr()
|
|
{
|
|
if ( mRawPtr )
|
|
NSCAP_RELEASE(mRawPtr);
|
|
}
|
|
#endif
|
|
|
|
|
|
// Constructors
|
|
|
|
nsCOMPtr()
|
|
: nsCOMPtr_base(0)
|
|
// default constructor
|
|
{
|
|
// nothing else to do here
|
|
}
|
|
|
|
nsCOMPtr( const nsCOMPtr<nsISupports>& aSmartPtr )
|
|
: nsCOMPtr_base(aSmartPtr.mRawPtr)
|
|
// copy constructor
|
|
{
|
|
if ( mRawPtr )
|
|
NSCAP_ADDREF(mRawPtr);
|
|
}
|
|
|
|
nsCOMPtr( nsISupports* aRawPtr )
|
|
: nsCOMPtr_base(aRawPtr)
|
|
// construct from a raw pointer (of the right type)
|
|
{
|
|
if ( mRawPtr )
|
|
NSCAP_ADDREF(mRawPtr);
|
|
}
|
|
|
|
nsCOMPtr( const nsDontAddRef<nsISupports>& aSmartPtr )
|
|
: nsCOMPtr_base(aSmartPtr.mRawPtr)
|
|
// construct from |dont_AddRef(expr)|
|
|
{
|
|
// nothing else to do here
|
|
}
|
|
|
|
nsCOMPtr( const nsCOMPtr_helper& helper )
|
|
: nsCOMPtr_base(0)
|
|
// ...and finally, anything else we might need to construct from
|
|
// can exploit the |nsCOMPtr_helper| facility
|
|
{
|
|
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 nsDontAddRef<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<T>*| 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();
|
|
}
|
|
|
|
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(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
|
|
|
|
|
|
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**| (or |T**| if 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 0
|
|
#ifdef NSCAP_FEATURE_TEST_DONTQUERY_CASES
|
|
~nsGetterAddRefs()
|
|
{
|
|
mTargetSmartPtr.Assert_NoQueryNeeded();
|
|
}
|
|
#endif
|
|
#endif
|
|
|
|
operator void**()
|
|
{
|
|
return NS_REINTERPRET_CAST(void**, mTargetSmartPtr.StartAssignment());
|
|
}
|
|
|
|
operator T**()
|
|
{
|
|
return mTargetSmartPtr.StartAssignment();
|
|
}
|
|
|
|
operator nsISupports**()
|
|
{
|
|
return NS_REINTERPRET_CAST(nsISupports**, 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
|
|
}
|
|
|
|
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);
|
|
}
|
|
|
|
|
|
class NSCAP_Zero;
|
|
|
|
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 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>
|
|
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, 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 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>
|
|
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());
|
|
}
|
|
|
|
inline
|
|
NSCAP_BOOL
|
|
SameCOMIdentity( nsISupports* lhs, nsISupports* rhs )
|
|
{
|
|
return nsCOMPtr<nsISupports>( do_QueryInterface(lhs) ) == nsCOMPtr<nsISupports>( do_QueryInterface(rhs) );
|
|
}
|
|
|
|
template <class T>
|
|
inline
|
|
nsresult
|
|
CallQueryInterface( nsCOMPtr<T>& aSourcePtr, T** aDestPtr )
|
|
{
|
|
return CallQueryInterface(aSourcePtr.get(), aDestPtr);
|
|
}
|
|
|
|
#endif // !defined(nsCOMPtr_h___)
|