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112 lines
3.7 KiB
C++
112 lines
3.7 KiB
C++
/* ***** BEGIN LICENSE BLOCK *****
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* Version: MPL 1.1/GPL 2.0/LGPL 2.1
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*
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* The contents of this file are subject to the Mozilla Public License Version
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* 1.1 (the "License"); you may not use this file except in compliance with
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* the License. You may obtain a copy of the License at
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* http://www.mozilla.org/MPL/
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*
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* Software distributed under the License is distributed on an "AS IS" basis,
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* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
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* for the specific language governing rights and limitations under the
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* License.
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*
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* The Original Code is XPCOM.
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*
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* The Initial Developer of the Original Code is Netscape Communications Corp.
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* Portions created by the Initial Developer are Copyright (C) 2001
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* the Initial Developer. All Rights Reserved.
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*
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* Contributor(s):
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*
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* Alternatively, the contents of this file may be used under the terms of
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* either the GNU General Public License Version 2 or later (the "GPL"), or
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* the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
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* in which case the provisions of the GPL or the LGPL are applicable instead
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* of those above. If you wish to allow use of your version of this file only
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* under the terms of either the GPL or the LGPL, and not to allow others to
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* use your version of this file under the terms of the MPL, indicate your
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* decision by deleting the provisions above and replace them with the notice
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* and other provisions required by the GPL or the LGPL. If you do not delete
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* the provisions above, a recipient may use your version of this file under
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* the terms of any one of the MPL, the GPL or the LGPL.
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*
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* ***** END LICENSE BLOCK ***** */
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#ifndef nsISupportsBase_h__
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#define nsISupportsBase_h__
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#ifndef nscore_h___
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#include "nscore.h"
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#endif
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#ifndef nsID_h__
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#include "nsID.h"
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#endif
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/*@{*/
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/**
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* IID for the nsISupports interface
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* {00000000-0000-0000-c000-000000000046}
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*
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* To maintain binary compatibility with COM's IUnknown, we define the IID
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* of nsISupports to be the same as that of COM's IUnknown.
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*/
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#define NS_ISUPPORTS_IID \
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{ 0x00000000, 0x0000, 0x0000, \
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{0xc0, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x46} }
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/**
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* Basic component object model interface. Objects which implement
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* this interface support runtime interface discovery (QueryInterface)
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* and a reference counted memory model (AddRef/Release). This is
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* modelled after the win32 IUnknown API.
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*/
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class NS_NO_VTABLE nsISupports {
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public:
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NS_DECLARE_STATIC_IID_ACCESSOR(NS_ISUPPORTS_IID)
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/**
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* @name Methods
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*/
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//@{
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/**
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* A run time mechanism for interface discovery.
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* @param aIID [in] A requested interface IID
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* @param aInstancePtr [out] A pointer to an interface pointer to
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* receive the result.
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* @return <b>NS_OK</b> if the interface is supported by the associated
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* instance, <b>NS_NOINTERFACE</b> if it is not.
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* <b>NS_ERROR_INVALID_POINTER</b> if <i>aInstancePtr</i> is <b>NULL</b>.
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*/
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NS_IMETHOD QueryInterface(REFNSIID aIID, void** aInstancePtr) = 0;
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/**
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* Increases the reference count for this interface.
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* The associated instance will not be deleted unless
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* the reference count is returned to zero.
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*
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* @return The resulting reference count.
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*/
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NS_IMETHOD_(nsrefcnt) AddRef(void) = 0;
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/**
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* Decreases the reference count for this interface.
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* Generally, if the reference count returns to zero,
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* the associated instance is deleted.
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*
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* @return The resulting reference count.
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*/
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NS_IMETHOD_(nsrefcnt) Release(void) = 0;
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//@}
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};
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NS_DEFINE_STATIC_IID_ACCESSOR(nsISupports, NS_ISUPPORTS_IID)
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/*@}*/
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#endif
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