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Fixup CallQueryInterface

This commit is contained in:
scc%netscape.com 1999-05-12 04:50:08 +00:00
Родитель 7b0a5ff5cf
Коммит 5f7f07adc9
6 изменённых файлов: 12 добавлений и 1360 удалений
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8
xpcom/base/nsCOMPtr.h
Просмотреть файл

@ -637,19 +637,17 @@ SameCOMIdentity( nsISupports* lhs, nsISupports* rhs )
#endif // defined(NSCAP_FEATURE_ALLOW_COMPARISONS)
#if 0
template <class SourceType, class DestinationType>
template <class DestinationType>
inline
nsresult
CallQueryInterface( SourceType* aSource, nsCOMPtr<DestinationType>* aDestination )
CallQueryInterface( nsISupports* aSource, nsCOMPtr<DestinationType>* aDestination )
// a type-safe shortcut for calling the |QueryInterface()| member function
{
NS_PRECONDITION(aSource, "null parameter");
NS_PRECONDITION(aDestination, "null parameter");
return aSource->QueryInterface(DestinationType::GetIID(), NS_STATIC_CAST(void**, getter_AddRefs(*aDestination)));
return aSource->QueryInterface(DestinationType::GetIID(), (void**)getter_AddRefs(*aDestination));
}
#endif
#endif // !defined(nsCOMPtr_h___)

6
xpcom/base/nsISupportsUtils.h
Просмотреть файл

@ -671,15 +671,15 @@ extern "C++" {
class nsISupports;
template <class SourceType, class DestinationType>
template <class DestinationType>
inline
nsresult
CallQueryInterface( SourceType* aSource, DestinationType** aDestination )
CallQueryInterface( nsISupports* aSource, DestinationType** aDestination )
// a type-safe shortcut for calling the |QueryInterface()| member function
{
NS_PRECONDITION(aSource, "null parameter");
return aSource->QueryInterface(DestinationType::GetIID(), aDestination);
return aSource->QueryInterface(DestinationType::GetIID(), (void**)aDestination);
}
} // extern "C++"

8
xpcom/glue/nsCOMPtr.h
Просмотреть файл

@ -637,19 +637,17 @@ SameCOMIdentity( nsISupports* lhs, nsISupports* rhs )
#endif // defined(NSCAP_FEATURE_ALLOW_COMPARISONS)
#if 0
template <class SourceType, class DestinationType>
template <class DestinationType>
inline
nsresult
CallQueryInterface( SourceType* aSource, nsCOMPtr<DestinationType>* aDestination )
CallQueryInterface( nsISupports* aSource, nsCOMPtr<DestinationType>* aDestination )
// a type-safe shortcut for calling the |QueryInterface()| member function
{
NS_PRECONDITION(aSource, "null parameter");
NS_PRECONDITION(aDestination, "null parameter");
return aSource->QueryInterface(DestinationType::GetIID(), NS_STATIC_CAST(void**, getter_AddRefs(*aDestination)));
return aSource->QueryInterface(DestinationType::GetIID(), (void**)getter_AddRefs(*aDestination));
}
#endif
#endif // !defined(nsCOMPtr_h___)

6
xpcom/glue/nsISupportsUtils.h
Просмотреть файл

@ -671,15 +671,15 @@ extern "C++" {
class nsISupports;
template <class SourceType, class DestinationType>
template <class DestinationType>
inline
nsresult
CallQueryInterface( SourceType* aSource, DestinationType** aDestination )
CallQueryInterface( nsISupports* aSource, DestinationType** aDestination )
// a type-safe shortcut for calling the |QueryInterface()| member function
{
NS_PRECONDITION(aSource, "null parameter");
return aSource->QueryInterface(DestinationType::GetIID(), aDestination);
return aSource->QueryInterface(DestinationType::GetIID(), (void**)aDestination);
}
} // extern "C++"

655
xpcom/public/nsCOMPtr.h
Просмотреть файл

@ -1,655 +0,0 @@
/* -*- 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
/*
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 *&
+ alternatives for comparison
+ 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_ALLOW_RAW_POINTERS
#define NSCAP_FEATURE_ALLOW_COMPARISONS
#define NSCAP_FEATURE_FACTOR_DESTRUCTOR
/*
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.
*/
{
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
nsDerivedSafe<T>& operator=( const nsDerivedSafe<T>& ); // NOT TO BE IMPLEMENTED
// you may not call |operator=()| through a dereferenced |nsCOMPtr|, because you'd get the wrong one
};
#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.
*/
{
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);
}
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;
};
inline
const nsQueryInterface
do_QueryInterface( nsISupports* aRawPtr, nsresult* error = 0 )
{
return nsQueryInterface(aRawPtr, error);
}
inline
const nsQueryInterface
null_nsCOMPtr()
/*
You can use this to assign |NULL| into an |nsCOMPtr|, e.g.,
myPtr = null_nsCOMPtr();
*/
{
typedef nsISupports* nsISupports_Ptr;
return nsQueryInterface(nsISupports_Ptr(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()| instead.
See also |getter_AddRefs()| and |class nsGetterAddRefs|.
*/
{
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);
}
// This call is now deprecated. Use |getter_AddRefs()| instead.
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|.
*/
{
public:
nsCOMPtr_base( nsISupports* rawPtr = 0 )
: mRawPtr(rawPtr)
{
// nothing else to do here
}
#ifdef NSCAP_FEATURE_FACTOR_DESTRUCTOR
NS_EXPORT ~nsCOMPtr_base();
#endif
#if 0
~nsCOMPtr_base()
{
if ( mRawPtr )
NSCAP_RELEASE(mRawPtr);
}
#endif
NS_EXPORT void assign_with_AddRef( nsISupports* );
NS_EXPORT void assign_with_QueryInterface( nsISupports*, const nsIID&, nsresult* );
NS_EXPORT void** begin_assignment();
protected:
nsISupports* mRawPtr;
};
template <class T>
class nsCOMPtr : private nsCOMPtr_base
/*
...
*/
{
public:
typedef T element_type;
#ifndef NSCAP_FEATURE_FACTOR_DESTRUCTOR
~nsCOMPtr()
{
if ( mRawPtr )
NSCAP_RELEASE(mRawPtr);
}
#endif
nsCOMPtr()
// : nsCOMPtr_base(0)
{
// nothing else to do here
}
nsCOMPtr( const nsQueryInterface& aSmartPtr )
// : nsCOMPtr_base(0)
{
assign_with_QueryInterface(aSmartPtr.mRawPtr, T::GetIID(), aSmartPtr.mErrorPtr);
}
nsCOMPtr( const nsDontAddRef<T>& aSmartPtr )
: nsCOMPtr_base(aSmartPtr.mRawPtr)
{
// nothing else to do here
}
nsCOMPtr( const nsDontQueryInterface<T>& aSmartPtr )
: nsCOMPtr_base(aSmartPtr.mRawPtr)
{
if ( mRawPtr )
NSCAP_ADDREF(mRawPtr);
}
nsCOMPtr( const nsCOMPtr<T>& aSmartPtr )
: nsCOMPtr_base(aSmartPtr.mRawPtr)
{
if ( mRawPtr )
NSCAP_ADDREF(mRawPtr);
}
#ifdef NSCAP_FEATURE_ALLOW_RAW_POINTERS
nsCOMPtr( T* aRawPtr )
: nsCOMPtr_base(aRawPtr)
{
if ( mRawPtr )
NSCAP_ADDREF(mRawPtr);
}
nsCOMPtr<T>&
operator=( T* rhs )
{
assign_with_AddRef(rhs);
return *this;
}
#endif
nsCOMPtr<T>&
operator=( const nsQueryInterface& rhs )
{
assign_with_QueryInterface(rhs.mRawPtr, T::GetIID(), rhs.mErrorPtr);
return *this;
}
nsCOMPtr<T>&
operator=( const nsDontAddRef<T>& rhs )
{
if ( mRawPtr )
NSCAP_RELEASE(mRawPtr);
mRawPtr = rhs.mRawPtr;
return *this;
}
nsCOMPtr<T>&
operator=( const nsDontQueryInterface<T>& rhs )
{
assign_with_AddRef(rhs.mRawPtr);
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>;
/*
In a perfect world, the following member function, |StartAssignment|, would be private.
It is and should be only accessed by the closely related class |nsGetterAddRefs<T>|.
Unfortunately, some compilers---most notably VC++5.0---fail to grok the
friend declaration above or in any alternate acceptable form. So, physically
it will be public (until our compilers get smarter); but it is not to be
considered part of the logical public interface.
*/
#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
}
};
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.
*/
{
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);
}
#ifdef NSCAP_FEATURE_ALLOW_COMPARISONS
/*
Note: can't enable this till I find a suitable replacement for |bool|.
*/
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, 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());
}
inline
NSCAP_BOOL
SameCOMIdentity( nsISupports* lhs, nsISupports* rhs )
{
return nsCOMPtr<nsISupports>( do_QueryInterface(lhs) ) == nsCOMPtr<nsISupports>( do_QueryInterface(rhs) );
}
#endif // defined(NSCAP_FEATURE_ALLOW_COMPARISONS)
#if 0
template <class SourceType, class DestinationType>
inline
nsresult
CallQueryInterface( SourceType* aSource, nsCOMPtr<DestinationType>* aDestination )
// a type-safe shortcut for calling the |QueryInterface()| member function
{
NS_PRECONDITION(aSource, "null parameter");
NS_PRECONDITION(aDestination, "null parameter");
return aSource->QueryInterface(DestinationType::GetIID(), NS_STATIC_CAST(void**, getter_AddRefs(*aDestination)));
}
#endif
#endif // !defined(nsCOMPtr_h___)

689
xpcom/public/nsISupportsUtils.h
Просмотреть файл

@ -1,689 +0,0 @@
/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*-
*
* 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 __nsISupportsUtils_h
#define __nsISupportsUtils_h
/***************************************************************************/
/* this section copied from the hand written nsISupports.h */
#include "nsDebug.h"
#include "nsTraceRefcnt.h"
#include "nsID.h"
#include "nsIID.h"
#include "nsError.h"
#if defined(NS_MT_SUPPORTED)
#include "prcmon.h"
#endif /* NS_MT_SUPPORTED */
#if defined(XPIDL_JS_STUBS)
struct JSObject;
struct JSContext;
#endif
/*@{*/
////////////////////////////////////////////////////////////////////////////////
/**
* IID for the nsISupports interface
* {00000000-0000-0000-c000-000000000046}
*
* NOTE: NEVER EVER EVER EVER EVER change this IID. Never. Not once.
* No. Don't do it. Stop!
*/
#define NS_ISUPPORTS_IID \
{ 0x00000000, 0x0000, 0x0000, \
{0xc0, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x46} }
/**
* Reference count values
*/
typedef PRUint32 nsrefcnt;
/**
* Base class for all XPCOM objects to use. This macro forces the C++
* compiler to use a compatible vtable layout for all XPCOM objects.
*/
#ifdef XP_MAC
#define XPCOM_OBJECT : public __comobject
#else
#define XPCOM_OBJECT
#endif
/**
* Basic component object model interface. Objects which implement
* this interface support runtime interface discovery (QueryInterface)
* and a reference counted memory model (AddRef/Release). This is
* modelled after the win32 IUnknown API.
*/
class nsISupports XPCOM_OBJECT {
public:
static const nsIID& GetIID() { static nsIID iid = NS_ISUPPORTS_IID; return iid; }
/**
* @name Methods
*/
//@{
/**
* A run time mechanism for interface discovery.
* @param aIID [in] A requested interface IID
* @param aInstancePtr [out] A pointer to an interface pointer to
* receive the result.
* @return <b>NS_OK</b> if the interface is supported by the associated
* instance, <b>NS_NOINTERFACE</b> if it is not.
* <b>NS_ERROR_INVALID_POINTER</b> if <i>aInstancePtr</i> is <b>NULL</b>.
*/
NS_IMETHOD QueryInterface(REFNSIID aIID,
void** aInstancePtr) = 0;
/**
* Increases the reference count for this interface.
* The associated instance will not be deleted unless
* the reference count is returned to zero.
*
* @return The resulting reference count.
*/
NS_IMETHOD_(nsrefcnt) AddRef(void) = 0;
/**
* Decreases the reference count for this interface.
* Generally, if the reference count returns to zero,
* the associated instance is deleted.
*
* @return The resulting reference count.
*/
NS_IMETHOD_(nsrefcnt) Release(void) = 0;
#if XPIDL_JS_STUBS
// XXX Scriptability hack...
static NS_EXPORT_(JSObject*) InitJSClass(JSContext* cx) {
return 0;
}
static NS_EXPORT_(JSObject*) GetJSObject(JSContext* cx, nsISupports* priv) {
NS_NOTYETIMPLEMENTED("nsISupports isn't XPIDL scriptable yet");
return 0;
}
#endif
//@}
};
/*@}*/
/***************************************************************************/
/**
* A macro to build the static const IID accessor method
*/
#define NS_DEFINE_STATIC_IID_ACCESSOR(the_iid) \
static const nsIID& GetIID() {static nsIID iid = the_iid; return iid;}
/**
* A macro to build the static const CID accessor method
*/
#define NS_DEFINE_STATIC_CID_ACCESSOR(the_cid) \
static const nsID& GetCID() {static nsID cid = the_cid; return cid;}
/**
* Some convenience macros for implementing AddRef and Release
*/
/**
* Declare the reference count variable and the implementations of the
* AddRef and QueryInterface methods.
*/
#define NS_DECL_ISUPPORTS \
public: \
NS_IMETHOD QueryInterface(REFNSIID aIID, \
void** aInstancePtr); \
NS_IMETHOD_(nsrefcnt) AddRef(void); \
NS_IMETHOD_(nsrefcnt) Release(void); \
protected: \
nsrefcnt mRefCnt; \
public:
#define NS_DECL_ISUPPORTS_EXPORTED \
public: \
NS_EXPORT NS_IMETHOD QueryInterface(REFNSIID aIID, \
void** aInstancePtr); \
NS_EXPORT NS_IMETHOD_(nsrefcnt) AddRef(void); \
NS_EXPORT NS_IMETHOD_(nsrefcnt) Release(void); \
protected: \
nsrefcnt mRefCnt; \
public:
////////////////////////////////////////////////////////////////////////////////
/**
* Initialize the reference count variable. Add this to each and every
* constructor you implement.
*/
#define NS_INIT_REFCNT() mRefCnt = 0
#define NS_INIT_ISUPPORTS() NS_INIT_REFCNT() // what it should have been called in the first place
/**
* Use this macro to implement the AddRef method for a given <i>_class</i>
* @param _class The name of the class implementing the method
*/
#define NS_IMPL_ADDREF(_class) \
NS_IMETHODIMP_(nsrefcnt) _class::AddRef(void) \
{ \
NS_PRECONDITION(PRInt32(mRefCnt) >= 0, "illegal refcnt"); \
return ++mRefCnt; \
}
/**
* Use this macro to implement the Release method for a given <i>_class</i>
* @param _class The name of the class implementing the method
*/
#define NS_IMPL_RELEASE(_class) \
NS_IMETHODIMP_(nsrefcnt) _class::Release(void) \
{ \
NS_PRECONDITION(0 != mRefCnt, "dup release"); \
if (--mRefCnt == 0) { \
NS_DELETEXPCOM(this); \
return 0; \
} \
return mRefCnt; \
}
////////////////////////////////////////////////////////////////////////////////
/*
* Some convenience macros for implementing QueryInterface
*/
/**
* This implements query interface with two assumptions: First, the
* class in question implements nsISupports and it's own interface and
* nothing else. Second, the implementation of the class's primary
* inheritance chain leads to it's own interface.
*
* @param _class The name of the class implementing the method
* @param _classiiddef The name of the #define symbol that defines the IID
* for the class (e.g. NS_ISUPPORTS_IID)
*/
#define NS_IMPL_QUERY_INTERFACE(_class,_classiiddef) \
NS_IMETHODIMP _class::QueryInterface(REFNSIID aIID, void** aInstancePtr) \
{ \
if (NULL == aInstancePtr) { \
return NS_ERROR_NULL_POINTER; \
} \
\
*aInstancePtr = NULL; \
\
static NS_DEFINE_IID(kISupportsIID, NS_ISUPPORTS_IID); \
static NS_DEFINE_IID(kClassIID, _classiiddef); \
if (aIID.Equals(kClassIID)) { \
*aInstancePtr = (void*) this; \
NS_ADDREF_THIS(); \
return NS_OK; \
} \
if (aIID.Equals(kISupportsIID)) { \
*aInstancePtr = (void*) ((nsISupports*)this); \
NS_ADDREF_THIS(); \
return NS_OK; \
} \
return NS_NOINTERFACE; \
}
/**
* Convenience macro for implementing all nsISupports methods for
* a simple class.
* @param _class The name of the class implementing the method
* @param _classiiddef The name of the #define symbol that defines the IID
* for the class (e.g. NS_ISUPPORTS_IID)
*/
#define NS_IMPL_ISUPPORTS(_class,_classiiddef) \
NS_IMPL_ADDREF(_class) \
NS_IMPL_RELEASE(_class) \
NS_IMPL_QUERY_INTERFACE(_class,_classiiddef)
////////////////////////////////////////////////////////////////////////////////
/**
* Declare that you're going to inherit from something that already
* implements nsISupports, but also implements an additional interface, thus
* causing an ambiguity. In this case you don't need another mRefCnt, you
* just need to forward the definitions to the appropriate superclass. E.g.
*
* class Bar : public Foo, public nsIBar { // both provide nsISupports
* public:
* NS_DECL_ISUPPORTS_INHERITED
* ...other nsIBar and Bar methods...
* };
*/
#define NS_DECL_ISUPPORTS_INHERITED \
public: \
NS_IMETHOD QueryInterface(REFNSIID aIID, \
void** aInstancePtr); \
NS_IMETHOD_(nsrefcnt) AddRef(void); \
NS_IMETHOD_(nsrefcnt) Release(void); \
/**
* These macros can be used in conjunction with NS_DECL_ISUPPORTS_INHERITED
* to implement the nsISupports methods, forwarding the invocations to a
* superclass that already implements nsISupports.
*
* Note that I didn't make these inlined because they're virtual methods.
*/
#define NS_IMPL_ADDREF_INHERITED(Class, Super) \
NS_IMETHODIMP_(nsrefcnt) Class::AddRef(void) \
{ \
return Super::AddRef(); \
} \
#define NS_IMPL_RELEASE_INHERITED(Class, Super) \
NS_IMETHODIMP_(nsrefcnt) Class::Release(void) \
{ \
return Super::Release(); \
} \
#define NS_IMPL_QUERY_INTERFACE_INHERITED(Class, Super, AdditionalInterface) \
NS_IMETHODIMP Class::QueryInterface(REFNSIID aIID, void** aInstancePtr) \
{ \
if (!aInstancePtr) return NS_ERROR_NULL_POINTER; \
if (aIID.Equals(AdditionalInterface::GetIID())) { \
*aInstancePtr = NS_STATIC_CAST(AdditionalInterface*, this); \
NS_ADDREF_THIS(); \
return NS_OK; \
} \
return Super::QueryInterface(aIID, aInstancePtr); \
} \
#define NS_IMPL_ISUPPORTS_INHERITED(Class, Super, AdditionalInterface) \
NS_IMPL_QUERY_INTERFACE_INHERITED(Class, Super, AdditionalInterface) \
NS_IMPL_ADDREF_INHERITED(Class, Super) \
NS_IMPL_RELEASE_INHERITED(Class, Super) \
////////////////////////////////////////////////////////////////////////////////
/**
*
* Threadsafe implementations of the ISupports convenience macros
*
*/
/**
* IID for the nsIsThreadsafe interface
* {88210890-47a6-11d2-bec3-00805f8a66dc}
*
* This interface is *only* used for debugging purposes to determine if
* a given component is threadsafe.
*/
#define NS_ISTHREADSAFE_IID \
{ 0x88210890, 0x47a6, 0x11d2, \
{0xbe, 0xc3, 0x00, 0x80, 0x5f, 0x8a, 0x66, 0xdc} }
#if defined(NS_MT_SUPPORTED)
#define NS_LOCK_INSTANCE() \
PR_CEnterMonitor((void*)this)
#define NS_UNLOCK_INSTANCE() \
PR_CExitMonitor((void*)this)
/**
* Use this macro to implement the AddRef method for a given <i>_class</i>
* @param _class The name of the class implementing the method
*/
#if defined(XP_PC)
#define NS_IMPL_THREADSAFE_ADDREF(_class) \
NS_IMETHODIMP_(nsrefcnt) _class::AddRef(void) \
{ \
NS_PRECONDITION(PRInt32(mRefCnt) >= 0, "illegal refcnt"); \
return InterlockedIncrement((LONG*)&mRefCnt); \
}
#else /* ! XP_PC */
#define NS_IMPL_THREADSAFE_ADDREF(_class) \
nsrefcnt _class::AddRef(void) \
{ \
nsrefcnt count; \
NS_LOCK_INSTANCE(); \
NS_PRECONDITION(PRInt32(mRefCnt) >= 0, "illegal refcnt"); \
count = ++mRefCnt; \
NS_UNLOCK_INSTANCE(); \
return count; \
}
#endif /* ! XP_PC */
/**
* Use this macro to implement the Release method for a given <i>_class</i>
* @param _class The name of the class implementing the method
*/
#if defined(XP_PC)
#define NS_IMPL_THREADSAFE_RELEASE(_class) \
NS_IMETHODIMP_(nsrefcnt) _class::Release(void) \
{ \
NS_PRECONDITION(0 != mRefCnt, "dup release"); \
if (0 == InterlockedDecrement((LONG*)&mRefCnt)) { \
NS_DELETEXPCOM(this); \
return 0; \
} \
return mRefCnt; /* Not threadsafe but who cares. */ \
}
#else /* ! XP_PC */
#define NS_IMPL_THREADSAFE_RELEASE(_class) \
nsrefcnt _class::Release(void) \
{ \
nsrefcnt count; \
NS_PRECONDITION(0 != mRefCnt, "dup release"); \
NS_LOCK_INSTANCE(); \
count = --mRefCnt; \
NS_UNLOCK_INSTANCE(); \
if (0 == count) { \
NS_DELETEXPCOM(this); \
return 0; \
} \
return count; \
}
#endif /* ! XP_PC */
////////////////////////////////////////////////////////////////////////////////
/*
* Some convenience macros for implementing QueryInterface
*/
/**
* This implements query interface with two assumptions: First, the
* class in question implements nsISupports and it's own interface and
* nothing else. Second, the implementation of the class's primary
* inheritance chain leads to it's own interface.
*
* @param _class The name of the class implementing the method
* @param _classiiddef The name of the #define symbol that defines the IID
* for the class (e.g. NS_ISUPPORTS_IID)
*/
#if defined(NS_DEBUG)
#define NS_VERIFY_THREADSAFE_INTERFACE(_iface) \
if (NULL != (_iface)) { \
nsISupports* tmp; \
static NS_DEFINE_IID(kIsThreadsafeIID, NS_ISTHREADSAFE_IID); \
NS_PRECONDITION((NS_OK == _iface->QueryInterface(kIsThreadsafeIID, \
(void**)&tmp)), \
"Interface is not threadsafe"); \
}
#define NS_IMPL_THREADSAFE_QUERY_INTERFACE(_class,_classiiddef) \
NS_IMETHODIMP _class::QueryInterface(REFNSIID aIID, void** aInstancePtr) \
{ \
if (NULL == aInstancePtr) { \
return NS_ERROR_NULL_POINTER; \
} \
\
*aInstancePtr = NULL; \
\
static NS_DEFINE_IID(kISupportsIID, NS_ISUPPORTS_IID); \
static NS_DEFINE_IID(kIsThreadsafeIID, NS_ISTHREADSAFE_IID); \
static NS_DEFINE_IID(kClassIID, _classiiddef); \
if (aIID.Equals(kClassIID)) { \
*aInstancePtr = (void*) this; \
NS_ADDREF_THIS(); \
return NS_OK; \
} \
if (aIID.Equals(kISupportsIID)) { \
*aInstancePtr = (void*) ((nsISupports*)this); \
NS_ADDREF_THIS(); \
return NS_OK; \
} \
if (aIID.Equals(kIsThreadsafeIID)) { \
return NS_OK; \
} \
return NS_NOINTERFACE; \
}
#else /* !NS_DEBUG */
#define NS_VERIFY_THREADSAFE_INTERFACE(_iface)
#define NS_IMPL_THREADSAFE_QUERY_INTERFACE(_class,_classiiddef) \
NS_IMPL_QUERY_INTERFACE(_class, _classiiddef)
#endif /* !NS_DEBUG */
/**
* Convenience macro for implementing all nsISupports methods for
* a simple class.
* @param _class The name of the class implementing the method
* @param _classiiddef The name of the #define symbol that defines the IID
* for the class (e.g. NS_ISUPPORTS_IID)
*/
#define NS_IMPL_THREADSAFE_ISUPPORTS(_class,_classiiddef) \
NS_IMPL_THREADSAFE_ADDREF(_class) \
NS_IMPL_THREADSAFE_RELEASE(_class) \
NS_IMPL_THREADSAFE_QUERY_INTERFACE(_class,_classiiddef)
#else /* !NS_MT_SUPPORTED */
#define NS_LOCK_INSTANCE()
#define NS_UNLOCK_INSTANCE()
#define NS_IMPL_THREADSAFE_ADDREF(_class) NS_IMPL_ADDREF(_class)
#define NS_IMPL_THREADSAFE_RELEASE(_class) NS_IMPL_RELEASE(_class)
#define NS_VERIFY_THREADSAFE_INTERFACE(_iface)
#define NS_IMPL_THREADSAFE_QUERY_INTERFACE(_class,_classiiddef) \
NS_IMPL_QUERY_INTERFACE(_class, _classiiddef)
#define NS_IMPL_THREADSAFE_ISUPPORTS(_class,_classiiddef) \
NS_IMPL_ADDREF(_class) \
NS_IMPL_RELEASE(_class) \
NS_IMPL_QUERY_INTERFACE(_class,_classiiddef)
#endif /* !NS_MT_SUPPORTED */
////////////////////////////////////////////////////////////////////////////////
// Debugging Macros
////////////////////////////////////////////////////////////////////////////////
/**
* Macro for instantiating a new object that implements nsISupports.
* Use this in your factory methods to allow for refcnt tracing.
* Note that you can only use this if you adhere to the no arguments
* constructor com policy (which you really should!).
* @param _result Where the new instance pointer is stored
* @param _type The type of object to call "new" with.
*/
#ifdef MOZ_TRACE_XPCOM_REFCNT
#define NS_NEWXPCOM(_result,_type) \
PR_BEGIN_MACRO \
_result = new _type(); \
nsTraceRefcnt::Create(_result, #_type, __FILE__, __LINE__); \
PR_END_MACRO
#else
#define NS_NEWXPCOM(_result,_type) \
_result = new _type()
#endif
/**
* Macro for deleting an object that implements nsISupports.
* Use this in your Release methods to allow for refcnt tracing.
* @param _ptr The object to delete.
*/
#ifdef MOZ_TRACE_XPCOM_REFCNT
#define NS_DELETEXPCOM(_ptr) \
PR_BEGIN_MACRO \
nsTraceRefcnt::Destroy((_ptr), __FILE__, __LINE__); \
delete (_ptr); \
PR_END_MACRO
#else
#define NS_DELETEXPCOM(_ptr) \
delete (_ptr)
#endif
/**
* Macro for adding a reference to an interface.
* @param _ptr The interface pointer.
*/
#ifdef MOZ_TRACE_XPCOM_REFCNT
#define NS_ADDREF(_ptr) \
((nsrefcnt) nsTraceRefcnt::AddRef((_ptr), (_ptr)->AddRef(), \
__FILE__, __LINE__))
#else
#define NS_ADDREF(_ptr) \
(_ptr)->AddRef()
#endif
/**
* Macro for adding a reference to this. This macro should be used
* because NS_ADDREF (when tracing) may require an ambiguous cast
* from the pointers primary type to nsISupports. This macro sidesteps
* that entire problem.
*/
#ifdef MOZ_TRACE_XPCOM_REFCNT
#define NS_ADDREF_THIS() \
((nsrefcnt) nsTraceRefcnt::AddRef(this, AddRef(), __FILE__, __LINE__))
#else
#define NS_ADDREF_THIS() \
AddRef()
#endif
/**
* Macro for adding a reference to an interface that checks for NULL.
* @param _ptr The interface pointer.
*/
#ifdef MOZ_TRACE_XPCOM_REFCNT
#define NS_IF_ADDREF(_ptr) \
((0 != (_ptr)) \
? ((nsrefcnt) nsTraceRefcnt::AddRef((_ptr), (_ptr)->AddRef(), __FILE__, \
__LINE__)) \
: 0)
#else
#define NS_IF_ADDREF(_ptr) \
((0 != (_ptr)) ? (_ptr)->AddRef() : 0)
#endif
/**
* Macro for releasing a reference to an interface.
*
* Note that when MOZ_TRACE_XPCOM_REFCNT is defined that the release will
* be done before the trace message is logged. If the reference count
* goes to zero and implementation of Release logs a message, the two
* messages will be logged out of order.
*
* @param _ptr The interface pointer.
*/
#ifdef MOZ_TRACE_XPCOM_REFCNT
#define NS_RELEASE(_ptr) \
PR_BEGIN_MACRO \
nsTraceRefcnt::Release((_ptr), (_ptr)->Release(), __FILE__, __LINE__); \
(_ptr) = 0; \
PR_END_MACRO
#else
#define NS_RELEASE(_ptr) \
PR_BEGIN_MACRO \
(_ptr)->Release(); \
(_ptr) = 0; \
PR_END_MACRO
#endif
/**
* Macro for releasing a reference to an interface, except that this
* macro preserves the return value from the underlying Release call.
* The interface pointer argument will only be NULLed if the reference count
* goes to zero.
*
* Note that when MOZ_TRACE_XPCOM_REFCNT is defined that the release will
* be done before the trace message is logged. If the reference count
* goes to zero and implementation of Release logs a message, the two
* messages will be logged out of order.
*
* @param _ptr The interface pointer.
*/
#ifdef MOZ_TRACE_XPCOM_REFCNT
#define NS_RELEASE2(_ptr, _result) \
PR_BEGIN_MACRO \
_result = ((nsrefcnt) nsTraceRefcnt::Release((_ptr), (_ptr)->Release(), \
__FILE__, __LINE__)); \
if (0 == (_result)) (_ptr) = 0; \
PR_END_MACRO
#else
#define NS_RELEASE2(_ptr, _result) \
PR_BEGIN_MACRO \
_result = (_ptr)->Release(); \
if (0 == (_result)) (_ptr) = 0; \
PR_END_MACRO
#endif
/**
* Macro for releasing a reference to an interface that checks for NULL;
*
* Note that when MOZ_TRACE_XPCOM_REFCNT is defined that the release will
* be done before the trace message is logged. If the reference count
* goes to zero and implementation of Release logs a message, the two
* messages will be logged out of order.
*
* @param _ptr The interface pointer.
*/
#ifdef MOZ_TRACE_XPCOM_REFCNT
#define NS_IF_RELEASE(_ptr) \
PR_BEGIN_MACRO \
((0 != (_ptr)) \
? ((nsrefcnt) nsTraceRefcnt::Release((_ptr), (_ptr)->Release(), \
__FILE__, __LINE__)) \
: 0); \
(_ptr) = 0; \
PR_END_MACRO
#else
#define NS_IF_RELEASE(_ptr) \
PR_BEGIN_MACRO \
((0 != (_ptr)) ? (_ptr)->Release() : 0); \
(_ptr) = 0; \
PR_END_MACRO
#endif
////////////////////////////////////////////////////////////////////////////////
// A type-safe interface for calling |QueryInterface()|. A similar implementation
// exists in "nsCOMPtr.h" for use with |nsCOMPtr|s.
extern "C++" {
// ...because some one is accidentally including this file inside an |extern "C"|
class nsISupports;
template <class SourceType, class DestinationType>
inline
nsresult
CallQueryInterface( SourceType* aSource, DestinationType** aDestination )
// a type-safe shortcut for calling the |QueryInterface()| member function
{
NS_PRECONDITION(aSource, "null parameter");
return aSource->QueryInterface(DestinationType::GetIID(), aDestination);
}
} // extern "C++"
////////////////////////////////////////////////////////////////////////////////
#endif /* __nsISupportsUtils_h */