зеркало из https://github.com/mozilla/gecko-dev.git
869 строки
22 KiB
C++
869 строки
22 KiB
C++
/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
|
|
/*
|
|
* The contents of this file are subject to the Netscape Public License
|
|
* Version 1.0 (the "NPL"); you may not use this file except in
|
|
* compliance with the NPL. You may obtain a copy of the NPL at
|
|
* http://www.mozilla.org/NPL/
|
|
*
|
|
* Software distributed under the NPL is distributed on an "AS IS" basis,
|
|
* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the NPL
|
|
* for the specific language governing rights and limitations under the
|
|
* NPL.
|
|
*
|
|
* The Initial Developer of this code under the NPL is Netscape
|
|
* Communications Corporation. Portions created by Netscape are
|
|
* Copyright (C) 1998 Netscape Communications Corporation. All Rights
|
|
* Reserved.
|
|
*/
|
|
|
|
#ifndef nsCOMPtr_h___
|
|
#define nsCOMPtr_h___
|
|
|
|
|
|
|
|
// Wrapping includes can speed up compiles (see "Large Scale C++ Software Design")
|
|
#ifndef nsDebug_h___
|
|
#include "nsDebug.h"
|
|
// for |NS_PRECONDITION|
|
|
#endif
|
|
|
|
#ifndef nsISupports_h___
|
|
#include "nsISupports.h"
|
|
// for |nsresult|, |NS_ADDREF|, et al
|
|
#endif
|
|
|
|
#ifndef __gen_nsIWeakReference_h__
|
|
#include "nsIWeakReference.h"
|
|
// for |nsIWeakReference|
|
|
#endif
|
|
|
|
/*
|
|
Public things defined in this file:
|
|
|
|
T* rawTptr;
|
|
class nsCOMPtr<T> nsCOMPtr<T> smartTptr;
|
|
|
|
null_nsCOMPtr() smartTptr = null_nsCOMPtr();
|
|
|
|
do_QueryInterface( nsISupports* ) smartTptr = do_QueryInterface(other_ptr);
|
|
do_QueryInterface( nsISupports*, nsresult* ) smartTptr = do_QueryInterface(other_ptr, &status);
|
|
|
|
dont_QueryInterface( T* ) smartTptr = dont_QueryInterface(rawTptr);
|
|
|
|
getter_AddRefs( nsCOMPtr<T>& )
|
|
getter_AddRefs( T* )
|
|
dont_AddRef( T* )
|
|
|
|
CallQueryInterface( nsISupports*, T** )
|
|
CallQueryInterface( nsISupports*, nsCOMPtr<T>* )
|
|
*/
|
|
|
|
/*
|
|
Having problems?
|
|
|
|
See the User Manual at:
|
|
<http://www.meer.net/ScottCollins/doc/nsCOMPtr.html>, or
|
|
<http://www.mozilla.org/projects/xpcom/nsCOMPtr.html>
|
|
*/
|
|
|
|
|
|
|
|
|
|
/*
|
|
TO DO...
|
|
|
|
+ Improve internal documentation
|
|
+ mention *&
|
|
+ do_QueryInterface
|
|
*/
|
|
|
|
/*
|
|
WARNING:
|
|
This file defines several macros for internal use only. These macros begin with the
|
|
prefix |NSCAP_|. Do not use these macros in your own code. They are for internal use
|
|
only for cross-platform compatibility, and are subject to change without notice.
|
|
*/
|
|
|
|
|
|
/*
|
|
Set up some |#define|s to turn off a couple of troublesome C++ features.
|
|
Interestingly, none of the compilers barf on template stuff. These are set up automatically
|
|
by the autoconf system for all Unixes. (Temporarily, I hope) I have to define them
|
|
myself for Mac and Windows.
|
|
*/
|
|
|
|
// under Metrowerks (Mac), we don't have autoconf yet
|
|
#ifdef __MWERKS__
|
|
#define HAVE_CPP_USING
|
|
#define HAVE_CPP_EXPLICIT
|
|
#define HAVE_CPP_NEW_CASTS
|
|
#define HAVE_CPP_BOOL
|
|
#endif
|
|
|
|
// under VC++ (Windows), we don't have autoconf yet
|
|
#ifdef _MSC_VER
|
|
#define HAVE_CPP_EXPLICIT
|
|
#define HAVE_CPP_USING
|
|
#define HAVE_CPP_NEW_CASTS
|
|
|
|
#if (_MSC_VER<1100)
|
|
// before 5.0, VC++ couldn't handle explicit
|
|
#undef HAVE_CPP_EXPLICIT
|
|
#elif (_MSC_VER==1100)
|
|
// VC++5.0 has an internal compiler error (sometimes) without this
|
|
#undef HAVE_CPP_USING
|
|
#endif
|
|
|
|
#define NSCAP_FEATURE_INLINE_STARTASSIGNMENT
|
|
// under VC++, we win by inlining StartAssignment
|
|
#endif
|
|
|
|
#define NSCAP_FEATURE_FACTOR_DESTRUCTOR
|
|
|
|
#ifdef NS_DEBUG
|
|
#define NSCAP_FEATURE_TEST_DONTQUERY_CASES
|
|
#define NSCAP_FEATURE_DEBUG_PTR_TYPES
|
|
#endif
|
|
|
|
/*
|
|
|...TEST_DONTQUERY_CASES| and |...DEBUG_PTR_TYPES| introduce some code that is
|
|
problematic on a select few of our platforms, e.g., QNX. Therefore, I'm providing
|
|
a mechanism by which these features can be explicitly disabled from the command-line.
|
|
*/
|
|
|
|
#ifdef NSCAP_DISABLE_TEST_DONTQUERY_CASES
|
|
#undef NSCAP_FEATURE_TEST_DONTQUERY_CASES
|
|
#endif
|
|
|
|
#if defined(NSCAP_DISABLE_DEBUG_PTR_TYPES) || !defined(NS_DEBUG)
|
|
#undef NSCAP_FEATURE_DEBUG_PTR_TYPES
|
|
#endif
|
|
|
|
#ifdef NSCAP_FEATURE_DEBUG_PTR_TYPES
|
|
#undef NSCAP_FEATURE_FACTOR_DESTRUCTOR
|
|
#endif
|
|
|
|
|
|
/*
|
|
If the compiler doesn't support |explicit|, we'll just make it go away, trusting
|
|
that the builds under compilers that do have it will keep us on the straight and narrow.
|
|
*/
|
|
#ifndef HAVE_CPP_EXPLICIT
|
|
#define explicit
|
|
#endif
|
|
|
|
#ifdef HAVE_CPP_BOOL
|
|
typedef bool NSCAP_BOOL;
|
|
#else
|
|
typedef PRBool NSCAP_BOOL;
|
|
#endif
|
|
|
|
#ifdef HAVE_CPP_NEW_CASTS
|
|
#define NSCAP_STATIC_CAST(T,x) static_cast<T>(x)
|
|
#define NSCAP_REINTERPRET_CAST(T,x) reinterpret_cast<T>(x)
|
|
#else
|
|
#define NSCAP_STATIC_CAST(T,x) ((T)(x))
|
|
#define NSCAP_REINTERPRET_CAST(T,x) ((T)(x))
|
|
#endif
|
|
|
|
#ifdef NSCAP_FEATURE_DEBUG_MACROS
|
|
#define NSCAP_ADDREF(ptr) NS_ADDREF(ptr)
|
|
#define NSCAP_RELEASE(ptr) NS_RELEASE(ptr)
|
|
#else
|
|
#define NSCAP_ADDREF(ptr) (ptr)->AddRef()
|
|
#define NSCAP_RELEASE(ptr) (ptr)->Release()
|
|
#endif
|
|
|
|
/*
|
|
WARNING:
|
|
VC++4.2 is very picky. To compile under VC++4.2, the classes must be defined
|
|
in an order that satisfies:
|
|
|
|
nsDerivedSafe < nsCOMPtr
|
|
nsDontAddRef < nsCOMPtr
|
|
nsCOMPtr < nsGetterAddRefs
|
|
|
|
The other compilers probably won't complain, so please don't reorder these
|
|
classes, on pain of breaking 4.2 compatibility.
|
|
*/
|
|
|
|
|
|
template <class T>
|
|
class nsDerivedSafe : public T
|
|
/*
|
|
No client should ever see or have to type the name of this class. It is the
|
|
artifact that makes it a compile-time error to call |AddRef| and |Release|
|
|
on a |nsCOMPtr|. DO NOT USE THIS TYPE DIRECTLY IN YOUR CODE.
|
|
|
|
See |nsCOMPtr::operator->|, |nsCOMPtr::operator*|, et al.
|
|
|
|
This type should be a nested class inside |nsCOMPtr<T>|.
|
|
*/
|
|
{
|
|
private:
|
|
#ifdef HAVE_CPP_USING
|
|
using T::AddRef;
|
|
using T::Release;
|
|
#else
|
|
NS_IMETHOD_(nsrefcnt) AddRef(void);
|
|
NS_IMETHOD_(nsrefcnt) Release(void);
|
|
#endif
|
|
|
|
void operator delete( void*, size_t ); // NOT TO BE IMPLEMENTED
|
|
// declaring |operator delete| private makes calling delete on an interface pointer a compile error
|
|
|
|
/*
|
|
The new way (not commented-out, below) didn't work until I chopped |operator=()| out of
|
|
|nsISupportsArray|. I have tested this on as many platforms as I can, I'm switching it on now.
|
|
I'm leaving the old way commented out, but visible so we can switch back if there is any
|
|
problem.
|
|
*/
|
|
|
|
// nsDerivedSafe<T>& operator=( const nsDerivedSafe<T>& ); // NOT TO BE IMPLEMENTED
|
|
nsDerivedSafe<T>& operator=( const T& ); // NOT TO BE IMPLEMENTED
|
|
// you may not call |operator=()| through a dereferenced |nsCOMPtr|, because you'd get the wrong one
|
|
|
|
/*
|
|
Compiler warnings and errors: nsDerivedSafe operator=() hides inherited operator=().
|
|
If you see that, that means somebody checked in a (XP)COM interface class that declares an
|
|
|operator=()|, and that's _bad_. So bad, in fact, that this declaration exists explicitly
|
|
to stop people from doing it.
|
|
*/
|
|
};
|
|
|
|
#if !defined(HAVE_CPP_USING) && defined(NEED_CPP_UNUSED_IMPLEMENTATIONS)
|
|
template <class T>
|
|
nsrefcnt
|
|
nsDerivedSafe<T>::AddRef()
|
|
{
|
|
return 0;
|
|
}
|
|
|
|
template <class T>
|
|
nsrefcnt
|
|
nsDerivedSafe<T>::Release()
|
|
{
|
|
return 0;
|
|
}
|
|
|
|
#endif
|
|
|
|
|
|
|
|
|
|
template <class T>
|
|
struct nsDontQueryInterface
|
|
/*
|
|
...
|
|
|
|
DO NOT USE THIS TYPE DIRECTLY IN YOUR CODE. Use |dont_QueryInterface()| instead.
|
|
|
|
This type should be a nested class inside |nsCOMPtr<T>|.
|
|
*/
|
|
{
|
|
explicit
|
|
nsDontQueryInterface( T* aRawPtr )
|
|
: mRawPtr(aRawPtr)
|
|
{
|
|
// nothing else to do here
|
|
}
|
|
|
|
T* mRawPtr;
|
|
};
|
|
|
|
template <class T>
|
|
inline
|
|
const nsDontQueryInterface<T>
|
|
dont_QueryInterface( T* aRawPtr )
|
|
{
|
|
return nsDontQueryInterface<T>(aRawPtr);
|
|
}
|
|
|
|
|
|
#if 1
|
|
|
|
template <class T>
|
|
struct
|
|
nsCOMPtrQueryRequest
|
|
{
|
|
T* mRawPtr;
|
|
nsresult* mErrorPtr;
|
|
|
|
explicit
|
|
nsCOMPtrQueryRequest( T* aRawPtr, nsresult* error = 0 )
|
|
: mRawPtr(aRawPtr),
|
|
mErrorPtr(error)
|
|
{
|
|
// nothing else to do here
|
|
}
|
|
};
|
|
|
|
typedef nsCOMPtrQueryRequest<nsISupports> nsQueryInterface;
|
|
typedef nsCOMPtrQueryRequest<nsIWeakReference> nsQueryReference;
|
|
|
|
#else
|
|
|
|
struct nsQueryInterface
|
|
/*
|
|
...
|
|
|
|
DO NOT USE THIS TYPE DIRECTLY IN YOUR CODE. Use |do_QueryInterface()| instead.
|
|
*/
|
|
{
|
|
explicit
|
|
nsQueryInterface( nsISupports* aRawPtr, nsresult* error = 0 )
|
|
: mRawPtr(aRawPtr),
|
|
mErrorPtr(error)
|
|
{
|
|
// nothing else to do here
|
|
}
|
|
|
|
nsISupports* mRawPtr;
|
|
nsresult* mErrorPtr;
|
|
};
|
|
|
|
struct nsQueryReference
|
|
{
|
|
explicit
|
|
nsQueryReference( nsIWeakReference* aRawPtr, nsresult* error = 0 )
|
|
: mRawPtr(aRawPtr),
|
|
mErrorPtr(error)
|
|
{
|
|
// nothing else to do here
|
|
}
|
|
|
|
nsIWeakReference* mRawPtr;
|
|
nsresult* mErrorPtr;
|
|
};
|
|
|
|
#endif
|
|
|
|
inline
|
|
const nsQueryInterface
|
|
do_QueryInterface( nsISupports* aRawPtr, nsresult* error = 0 )
|
|
{
|
|
return nsQueryInterface(aRawPtr, error);
|
|
}
|
|
|
|
inline
|
|
const nsQueryReference
|
|
do_QueryReference( nsIWeakReference* aRawPtr, nsresult* error = 0 )
|
|
{
|
|
return nsQueryReference(aRawPtr, error);
|
|
}
|
|
|
|
|
|
#define null_nsCOMPtr() (0)
|
|
|
|
|
|
|
|
template <class T>
|
|
struct nsDontAddRef
|
|
/*
|
|
...cooperates with |nsCOMPtr| to allow you to assign in a pointer _without_
|
|
|AddRef|ing it. You would rarely use this directly, but rather through the
|
|
machinery of |getter_AddRefs| in the argument list to functions that |AddRef|
|
|
their results before returning them to the caller.
|
|
|
|
DO NOT USE THIS TYPE DIRECTLY IN YOUR CODE. Use |getter_AddRefs()| or
|
|
|dont_AddRef()| instead.
|
|
|
|
See also |getter_AddRefs()|, |dont_AddRef()|, and |class nsGetterAddRefs|.
|
|
|
|
This type should be a nested class inside |nsCOMPtr<T>|.
|
|
*/
|
|
{
|
|
explicit
|
|
nsDontAddRef( T* aRawPtr )
|
|
: mRawPtr(aRawPtr)
|
|
{
|
|
// nothing else to do here
|
|
}
|
|
|
|
T* mRawPtr;
|
|
};
|
|
|
|
template <class T>
|
|
inline
|
|
const nsDontAddRef<T>
|
|
getter_AddRefs( T* aRawPtr )
|
|
/*
|
|
...makes typing easier, because it deduces the template type, e.g.,
|
|
you write |dont_AddRef(fooP)| instead of |nsDontAddRef<IFoo>(fooP)|.
|
|
*/
|
|
{
|
|
return nsDontAddRef<T>(aRawPtr);
|
|
}
|
|
|
|
template <class T>
|
|
inline
|
|
const nsDontAddRef<T>
|
|
dont_AddRef( T* aRawPtr )
|
|
{
|
|
return nsDontAddRef<T>(aRawPtr);
|
|
}
|
|
|
|
|
|
|
|
class nsCOMPtr_base
|
|
/*
|
|
...factors implementation for all template versions of |nsCOMPtr|.
|
|
|
|
This should really be an |nsCOMPtr<nsISupports>|, but this wouldn't work
|
|
because unlike the
|
|
|
|
Here's the way people normally do things like this
|
|
|
|
template <class T> class Foo { ... };
|
|
template <> class Foo<void*> { ... };
|
|
template <class T> class Foo<T*> : private Foo<void*> { ... };
|
|
*/
|
|
{
|
|
public:
|
|
|
|
nsCOMPtr_base( nsISupports* rawPtr = 0 )
|
|
: mRawPtr(rawPtr)
|
|
{
|
|
// nothing else to do here
|
|
}
|
|
|
|
#ifdef NSCAP_FEATURE_FACTOR_DESTRUCTOR
|
|
NS_EXPORT ~nsCOMPtr_base();
|
|
#endif
|
|
|
|
NS_EXPORT void assign_with_AddRef( nsISupports* );
|
|
NS_EXPORT void assign_with_QueryInterface( nsISupports*, const nsIID&, nsresult* );
|
|
NS_EXPORT void assign_with_QueryReference( nsIWeakReference*, const nsIID&, nsresult* );
|
|
NS_EXPORT void** begin_assignment();
|
|
|
|
protected:
|
|
nsISupports* mRawPtr;
|
|
};
|
|
|
|
// template <class T> class nsGetterAddRefs;
|
|
|
|
template <class T>
|
|
class nsCOMPtr
|
|
#ifndef NSCAP_FEATURE_DEBUG_PTR_TYPES
|
|
: private nsCOMPtr_base
|
|
#endif
|
|
{
|
|
#ifdef NSCAP_FEATURE_DEBUG_PTR_TYPES
|
|
private:
|
|
void assign_with_AddRef( nsISupports* );
|
|
void assign_with_QueryInterface( nsISupports*, const nsIID&, nsresult* );
|
|
void assign_with_QueryReference( nsIWeakReference*, const nsIID&, nsresult* );
|
|
void** begin_assignment();
|
|
|
|
private:
|
|
T* mRawPtr;
|
|
|
|
#define NSCAP_CTOR_BASE(x) mRawPtr(x)
|
|
#else
|
|
#define NSCAP_CTOR_BASE(x) nsCOMPtr_base(x)
|
|
#endif
|
|
|
|
public:
|
|
typedef T element_type;
|
|
|
|
#ifndef NSCAP_FEATURE_FACTOR_DESTRUCTOR
|
|
~nsCOMPtr()
|
|
{
|
|
if ( mRawPtr )
|
|
NSCAP_RELEASE(mRawPtr);
|
|
}
|
|
#endif
|
|
|
|
nsCOMPtr()
|
|
: NSCAP_CTOR_BASE(0)
|
|
{
|
|
// nothing else to do here
|
|
}
|
|
|
|
nsCOMPtr( const nsQueryInterface& aSmartPtr )
|
|
: NSCAP_CTOR_BASE(0)
|
|
{
|
|
assign_with_QueryInterface(aSmartPtr.mRawPtr, nsCOMTypeInfo<T>::GetIID(), aSmartPtr.mErrorPtr);
|
|
}
|
|
|
|
nsCOMPtr( const nsQueryReference& aSmartPtr )
|
|
: NSCAP_CTOR_BASE(0)
|
|
{
|
|
assign_with_QueryReference(aSmartPtr.mRawPtr, nsCOMTypeInfo<T>::GetIID(), aSmartPtr.mErrorPtr);
|
|
}
|
|
|
|
#ifdef NSCAP_FEATURE_TEST_DONTQUERY_CASES
|
|
void
|
|
Assert_NoQueryNeeded()
|
|
{
|
|
if ( mRawPtr )
|
|
{
|
|
T* query_result = 0;
|
|
nsresult status = CallQueryInterface(mRawPtr, &query_result);
|
|
NS_ASSERTION(query_result == mRawPtr, "QueryInterface needed");
|
|
if ( NS_SUCCEEDED(status) )
|
|
NSCAP_RELEASE(query_result);
|
|
}
|
|
}
|
|
|
|
#define NSCAP_ASSERT_NO_QUERY_NEEDED(); Assert_NoQueryNeeded();
|
|
#else
|
|
#define NSCAP_ASSERT_NO_QUERY_NEEDED();
|
|
#endif
|
|
|
|
nsCOMPtr( const nsDontAddRef<T>& aSmartPtr )
|
|
: NSCAP_CTOR_BASE(aSmartPtr.mRawPtr)
|
|
{
|
|
NSCAP_ASSERT_NO_QUERY_NEEDED();
|
|
}
|
|
|
|
nsCOMPtr( const nsDontQueryInterface<T>& aSmartPtr )
|
|
: NSCAP_CTOR_BASE(aSmartPtr.mRawPtr)
|
|
{
|
|
if ( mRawPtr )
|
|
NSCAP_ADDREF(mRawPtr);
|
|
|
|
NSCAP_ASSERT_NO_QUERY_NEEDED();
|
|
}
|
|
|
|
nsCOMPtr( const nsCOMPtr<T>& aSmartPtr )
|
|
: NSCAP_CTOR_BASE(aSmartPtr.mRawPtr)
|
|
{
|
|
if ( mRawPtr )
|
|
NSCAP_ADDREF(mRawPtr);
|
|
}
|
|
|
|
nsCOMPtr( T* aRawPtr )
|
|
: NSCAP_CTOR_BASE(aRawPtr)
|
|
{
|
|
if ( mRawPtr )
|
|
NSCAP_ADDREF(mRawPtr);
|
|
|
|
NSCAP_ASSERT_NO_QUERY_NEEDED();
|
|
}
|
|
|
|
nsCOMPtr<T>&
|
|
operator=( T* rhs )
|
|
{
|
|
assign_with_AddRef(rhs);
|
|
NSCAP_ASSERT_NO_QUERY_NEEDED();
|
|
return *this;
|
|
}
|
|
|
|
nsCOMPtr<T>&
|
|
operator=( const nsQueryInterface& rhs )
|
|
{
|
|
assign_with_QueryInterface(rhs.mRawPtr, nsCOMTypeInfo<T>::GetIID(), rhs.mErrorPtr);
|
|
return *this;
|
|
}
|
|
|
|
nsCOMPtr<T>&
|
|
operator=( const nsQueryReference& rhs )
|
|
{
|
|
assign_with_QueryReference(rhs.mRawPtr, nsCOMTypeInfo<T>::GetIID(), rhs.mErrorPtr);
|
|
return *this;
|
|
}
|
|
|
|
nsCOMPtr<T>&
|
|
operator=( const nsDontAddRef<T>& rhs )
|
|
{
|
|
if ( mRawPtr )
|
|
NSCAP_RELEASE(mRawPtr);
|
|
mRawPtr = rhs.mRawPtr;
|
|
|
|
NSCAP_ASSERT_NO_QUERY_NEEDED();
|
|
return *this;
|
|
}
|
|
|
|
nsCOMPtr<T>&
|
|
operator=( const nsDontQueryInterface<T>& rhs )
|
|
{
|
|
assign_with_AddRef(rhs.mRawPtr);
|
|
NSCAP_ASSERT_NO_QUERY_NEEDED();
|
|
return *this;
|
|
}
|
|
|
|
nsCOMPtr<T>&
|
|
operator=( const nsCOMPtr<T>& rhs )
|
|
{
|
|
assign_with_AddRef(rhs.mRawPtr);
|
|
return *this;
|
|
}
|
|
|
|
nsDerivedSafe<T>*
|
|
get() const
|
|
// returns a |nsDerivedSafe<T>*| to deny clients the use of |AddRef| and |Release|
|
|
{
|
|
return NSCAP_REINTERPRET_CAST(nsDerivedSafe<T>*, mRawPtr);
|
|
}
|
|
|
|
nsDerivedSafe<T>*
|
|
operator->() const
|
|
// returns a |nsDerivedSafe<T>*| to deny clients the use of |AddRef| and |Release|
|
|
{
|
|
NS_PRECONDITION(mRawPtr != 0, "You can't dereference a NULL nsCOMPtr with operator->().");
|
|
return get();
|
|
}
|
|
|
|
nsDerivedSafe<T>&
|
|
operator*() const
|
|
// returns a |nsDerivedSafe<T>*| to deny clients the use of |AddRef| and |Release|
|
|
{
|
|
NS_PRECONDITION(mRawPtr != 0, "You can't dereference a NULL nsCOMPtr with operator*().");
|
|
return *get();
|
|
}
|
|
|
|
operator nsDerivedSafe<T>*() const
|
|
{
|
|
return get();
|
|
}
|
|
|
|
#if 0
|
|
private:
|
|
friend class nsGetterAddRefs<T>;
|
|
#endif
|
|
|
|
T**
|
|
StartAssignment()
|
|
{
|
|
#ifndef NSCAP_FEATURE_INLINE_STARTASSIGNMENT
|
|
return NSCAP_REINTERPRET_CAST(T**, begin_assignment());
|
|
#else
|
|
if ( mRawPtr )
|
|
NSCAP_RELEASE(mRawPtr);
|
|
mRawPtr = 0;
|
|
return NSCAP_REINTERPRET_CAST(T**, &mRawPtr);
|
|
#endif
|
|
}
|
|
};
|
|
|
|
#ifdef NSCAP_FEATURE_DEBUG_PTR_TYPES
|
|
template <class T>
|
|
void
|
|
nsCOMPtr<T>::assign_with_AddRef( nsISupports* rawPtr )
|
|
{
|
|
if ( rawPtr )
|
|
NSCAP_ADDREF(rawPtr);
|
|
if ( mRawPtr )
|
|
NSCAP_RELEASE(mRawPtr);
|
|
mRawPtr = NS_REINTERPRET_CAST(T*, rawPtr);
|
|
}
|
|
|
|
template <class T>
|
|
void
|
|
nsCOMPtr<T>::assign_with_QueryInterface( nsISupports* rawPtr, const nsIID& iid, nsresult* result )
|
|
{
|
|
nsresult status = NS_ERROR_NULL_POINTER;
|
|
T* newPtr;
|
|
if ( !rawPtr || !NS_SUCCEEDED( status = rawPtr->QueryInterface(iid, NSCAP_REINTERPRET_CAST(void**, &newPtr)) ) )
|
|
newPtr = 0;
|
|
|
|
if ( mRawPtr )
|
|
NSCAP_RELEASE(mRawPtr);
|
|
|
|
mRawPtr = newPtr;
|
|
|
|
if ( result )
|
|
*result = status;
|
|
}
|
|
|
|
template <class T>
|
|
void
|
|
nsCOMPtr<T>::assign_with_QueryReference( nsIWeakReference* rawPtr, const nsIID& iid, nsresult* result )
|
|
{
|
|
nsresult status = NS_ERROR_NULL_POINTER;
|
|
T* newPtr;
|
|
if ( !rawPtr || !NS_SUCCEEDED( status = rawPtr->QueryReference(iid, NSCAP_REINTERPRET_CAST(void**, &newPtr)) ) )
|
|
newPtr = 0;
|
|
|
|
if ( mRawPtr )
|
|
NSCAP_RELEASE(mRawPtr);
|
|
|
|
mRawPtr = newPtr;
|
|
|
|
if ( result )
|
|
*result = status;
|
|
}
|
|
|
|
template <class T>
|
|
void**
|
|
nsCOMPtr<T>::begin_assignment()
|
|
{
|
|
if ( mRawPtr )
|
|
{
|
|
NSCAP_RELEASE(mRawPtr);
|
|
mRawPtr = 0;
|
|
}
|
|
|
|
return NSCAP_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
|
|
}
|
|
|
|
operator void**()
|
|
{
|
|
return NSCAP_REINTERPRET_CAST(void**, mTargetSmartPtr.StartAssignment());
|
|
}
|
|
|
|
T*&
|
|
operator*()
|
|
{
|
|
return *(mTargetSmartPtr.StartAssignment());
|
|
}
|
|
|
|
operator T**()
|
|
{
|
|
return mTargetSmartPtr.StartAssignment();
|
|
}
|
|
|
|
private:
|
|
nsCOMPtr<T>& 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 NSCAP_STATIC_CAST(const void*, lhs.get()) == NSCAP_STATIC_CAST(const void*, rhs.get());
|
|
}
|
|
|
|
template <class T, class U>
|
|
inline
|
|
NSCAP_BOOL
|
|
operator==( const nsCOMPtr<T>& lhs, const U* rhs )
|
|
{
|
|
return NSCAP_STATIC_CAST(const void*, lhs.get()) == NSCAP_STATIC_CAST(const void*, rhs);
|
|
}
|
|
|
|
template <class T, class U>
|
|
inline
|
|
NSCAP_BOOL
|
|
operator==( const U* lhs, const nsCOMPtr<T>& rhs )
|
|
{
|
|
return NSCAP_STATIC_CAST(const void*, lhs) == NSCAP_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 NSCAP_STATIC_CAST(const void*, lhs.get()) == NSCAP_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 NSCAP_REINTERPRET_CAST(const void*, lhs) == NSCAP_STATIC_CAST(const void*, rhs.get());
|
|
}
|
|
|
|
template <class T, class U>
|
|
inline
|
|
NSCAP_BOOL
|
|
operator!=( const nsCOMPtr<T>& lhs, const nsCOMPtr<U>& rhs )
|
|
{
|
|
return NSCAP_STATIC_CAST(const void*, lhs.get()) != NSCAP_STATIC_CAST(const void*, rhs.get());
|
|
}
|
|
|
|
template <class T, class U>
|
|
inline
|
|
NSCAP_BOOL
|
|
operator!=( const nsCOMPtr<T>& lhs, const U* rhs )
|
|
{
|
|
return NSCAP_STATIC_CAST(const void*, lhs.get()) != NSCAP_STATIC_CAST(const void*, rhs);
|
|
}
|
|
|
|
template <class T, class U>
|
|
inline
|
|
NSCAP_BOOL
|
|
operator!=( const U* lhs, const nsCOMPtr<T>& rhs )
|
|
{
|
|
return NSCAP_STATIC_CAST(const void*, lhs) != NSCAP_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 NSCAP_STATIC_CAST(const void*, lhs.get()) != NSCAP_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 NSCAP_REINTERPRET_CAST(const void*, lhs) != NSCAP_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 DestinationType>
|
|
inline
|
|
nsresult
|
|
CallQueryInterface( nsISupports* aSource, nsCOMPtr<DestinationType>* aDestination )
|
|
// a type-safe shortcut for calling the |QueryInterface()| member function
|
|
{
|
|
return CallQueryInterface(aSource, getter_AddRefs(*aDestination));
|
|
// this calls the _other_ |CallQueryInterface|
|
|
}
|
|
|
|
#endif // !defined(nsCOMPtr_h___)
|