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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_WEAKREF_HXX
#define INCLUDED_CPPUHELPER_WEAKREF_HXX
#include "sal/config.h"
#include <cstddef>
#include "com/sun/star/uno/Reference.hxx"
#include "com/sun/star/uno/XInterface.hpp"
#include "cppuhelper/cppuhelperdllapi.h"
namespace com
{
namespace sun
{
namespace star
{
namespace uno
{
class OWeakRefListener;
/** The WeakReferenceHelper holds a weak reference to an object.
That object must implement the css::uno::XWeak interface.
The WeakReferenceHelper itself is *not* thread safe, just as
Reference itself isn't, but the implementation of the listeners etc.
behind it *is* thread-safe, so multiple threads can have their own
WeakReferences to the same XWeak object.
*/
class CPPUHELPER_DLLPUBLIC WeakReferenceHelper
{
public:
/** Default ctor. Creates an empty weak reference.
*/
WeakReferenceHelper()
: m_pImpl( NULL )
{}
/** Copy ctor. Initialize this reference with the same interface as in rWeakRef.
@param rWeakRef another weak ref
*/
WeakReferenceHelper( const WeakReferenceHelper & rWeakRef );
#if defined LIBO_INTERNAL_ONLY
WeakReferenceHelper(WeakReferenceHelper && other): m_pImpl(other.m_pImpl)
{ other.m_pImpl = nullptr; }
#endif
/** Initialize this reference with the hard interface reference xInt. If the implementation
behind xInt does not support XWeak or xInt is null then this reference will be null.
@param xInt another hard interface reference
*/
WeakReferenceHelper( const css::uno::Reference< css::uno::XInterface > & xInt );
/** Releases this reference.
*/
~WeakReferenceHelper();
/** Releases this reference and takes over rWeakRef.
@param rWeakRef another weak ref
*/
WeakReferenceHelper & SAL_CALL operator = ( const WeakReferenceHelper & rWeakRef );
#if defined LIBO_INTERNAL_ONLY
WeakReferenceHelper & SAL_CALL operator =(WeakReferenceHelper && other);
#endif
/** Releases this reference and takes over hard reference xInt.
If the implementation behind xInt does not support XWeak
or XInt is null, then this reference is null.
@param xInt another hard reference
*/
WeakReferenceHelper & SAL_CALL operator = (
const css::uno::Reference< css::uno::XInterface > & xInt );
/** Returns true if both weak refs reference to the same object.
@param rObj another weak ref
@return true, if both weak refs reference to the same object.
*/
bool SAL_CALL operator == ( const WeakReferenceHelper & rObj ) const
{ return (get() == rObj.get()); }
/** Gets a hard reference to the object.
@return hard reference or null, if the weakly referenced interface has gone
*/
css::uno::Reference< css::uno::XInterface > SAL_CALL get() const;
/** Gets a hard reference to the object.
@return hard reference or null, if the weakly referenced interface has gone
*/
SAL_CALL operator Reference< XInterface > () const
{ return get(); }
/** Releases this reference.
@since UDK 3.2.12
*/
void SAL_CALL clear();
protected:
/// @cond INTERNAL
OWeakRefListener * m_pImpl;
/// @endcond
};
/** The WeakReference<> holds a weak reference to an object.
That object must implement the css::uno::XWeak interface.
The WeakReference itself is *not* thread safe, just as
Reference itself isn't, but the implementation of the listeners etc.
behind it *is* thread-safe, so multiple threads can have their own
WeakReferences to the same XWeak object.
@tparam interface_type type of interface
*/
template< class interface_type >
class SAL_WARN_UNUSED WeakReference : public WeakReferenceHelper
{
public:
/** Default ctor. Creates an empty weak reference.
*/
WeakReference()
: WeakReferenceHelper()
{}
/** Copy ctor. Initialize this reference with a hard reference.
@param rRef another hard ref
*/
WeakReference( const Reference< interface_type > & rRef )
: WeakReferenceHelper( rRef )
{}
/** Releases this reference and takes over hard reference xInt.
If the implementation behind xInt does not support XWeak
or XInt is null, then this reference is null.
@param xInt another hard reference
@since UDK 3.2.12
*/
WeakReference & SAL_CALL operator = (
const css::uno::Reference< interface_type > & xInt )
{ WeakReferenceHelper::operator=(xInt); return *this; }
/** Gets a hard reference to the object.
@return hard reference or null, if the weakly referenced interface has gone
*/
SAL_CALL operator Reference< interface_type > () const
{ return Reference< interface_type >::query( get() ); }
};
}
}
}
}
#endif
/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
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