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/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
/*
* This file is part of the LibreOffice project.
*
* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/.
*
* This file incorporates work covered by the following license notice:
*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed
* with this work for additional information regarding copyright
* ownership. The ASF licenses this file to you under the Apache
* License, Version 2.0 (the "License"); you may not use this file
* except in compliance with the License. You may obtain a copy of
* the License at http://www.apache.org/licenses/LICENSE-2.0 .
*/
#ifndef INCLUDED_CPPUHELPER_WEAK_HXX
#define INCLUDED_CPPUHELPER_WEAK_HXX
#include <cassert>
#include <cstddef>
#include "osl/interlck.h"
#include "rtl/alloc.h"
#include "com/sun/star/uno/XWeak.hpp"
#include "cppuhelper/cppuhelperdllapi.h"
namespace cppu
{
class OWeakConnectionPoint;
/** Base class to implement a UNO object supporting weak references, i.e. the object can be held
weakly (by a css::uno::WeakReference).
This implementation copes with reference counting. Upon last release(), the virtual dtor
is called.
@derive
Inherit from this class and delegate acquire()/ release() calls.
*/
class CPPUHELPER_DLLPUBLIC OWeakObject : public css::uno::XWeak
{
friend class OWeakConnectionPoint;
protected:
/** Virtual dtor.
@attention
Despite the fact that a RuntimeException is allowed to be thrown, you must not throw any
exception upon destruction!
*/
virtual ~OWeakObject() COVERITY_NOEXCEPT_FALSE;
/** disposes and resets m_pWeakConnectionPoint
@pre
m_refCount equals 0
*/
void disposeWeakConnectionPoint();
/** reference count.
@attention
Don't modify manually! Use acquire() and release().
*/
oslInterlockedCount m_refCount;
/// @cond INTERNAL
/** Container of all weak reference listeners and the connection point from the weak reference.
*/
OWeakConnectionPoint * m_pWeakConnectionPoint;
/** reserved for future use. do not use.
*/
void * m_pReserved;
/// @endcond
public:
/// @cond INTERNAL
// these are here to force memory de/allocation to sal lib.
static void * SAL_CALL operator new( size_t nSize )
{ return ::rtl_allocateMemory( nSize ); }
static void SAL_CALL operator delete( void * pMem )
{ ::rtl_freeMemory( pMem ); }
static void * SAL_CALL operator new( size_t, void * pMem )
{ return pMem; }
static void SAL_CALL operator delete( void *, void * )
{}
/// @endcond
#ifdef _MSC_VER
/** Default Constructor. Sets the reference count to zero.
Accidentally occurs in msvc mapfile = > had to be outlined.
*/
OWeakObject();
#else
/** Default Constructor. Sets the reference count to zero.
*/
OWeakObject()
: m_refCount( 0 )
, m_pWeakConnectionPoint( NULL )
, m_pReserved(NULL)
{}
#endif
/** Dummy copy constructor. Set the reference count to zero.
*/
OWeakObject( const OWeakObject & )
: css::uno::XWeak()
, m_refCount( 0 )
, m_pWeakConnectionPoint( NULL )
, m_pReserved(NULL)
{}
/** Dummy assignment operator. Does not affect reference count.
@return this OWeakObject
*/
OWeakObject & SAL_CALL operator = ( const OWeakObject &)
{ return *this; }
/** Basic queryInterface() implementation supporting com::sun::star::uno::XWeak and
com::sun::star::uno::XInterface.
@param rType demanded type
@return demanded type or empty any
*/
virtual css::uno::Any SAL_CALL queryInterface(
const css::uno::Type & rType ) SAL_OVERRIDE;
/** increasing m_refCount
*/
virtual void SAL_CALL acquire()
throw () SAL_OVERRIDE;
/** decreasing m_refCount
*/
virtual void SAL_CALL release()
throw () SAL_OVERRIDE;
/** XWeak::queryAdapter() implementation
@return a com::sun::star::uno::XAdapter reference
*/
virtual css::uno::Reference< css::uno::XAdapter > SAL_CALL queryAdapter() SAL_OVERRIDE;
/** Cast operator to XInterface reference.
@return XInterface reference
*/
SAL_CALL operator css::uno::Reference< css::uno::XInterface > ()
{ return this; }
};
/// @cond INTERNAL
/** Convenience function for constructor-based service implementations.
To be used like:
css::uno::XInterface * FOO_constructor_function(...) {
return cppu::acquire(new FOO(...));
}
@param instance
Newly created instance that should be acquired.
*/
static inline css::uno::XInterface * acquire(OWeakObject * instance)
{
assert(instance != NULL);
instance->acquire();
return instance;
}
/// @endcond
}
#endif
/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
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