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/*************************************************************************
*
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
* Copyright 2008 by Sun Microsystems, Inc.
*
* OpenOffice.org - a multi-platform office productivity suite
*
* $RCSfile: weakbag.hxx,v $
* $Revision: 1.3 $
*
* This file is part of OpenOffice.org.
*
* OpenOffice.org is free software: you can redistribute it and/or modify
* it under the terms of the GNU Lesser General Public License version 3
* only, as published by the Free Software Foundation.
*
* OpenOffice.org is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU Lesser General Public License version 3 for more details
* (a copy is included in the LICENSE file that accompanied this code).
*
* You should have received a copy of the GNU Lesser General Public License
* version 3 along with OpenOffice.org. If not, see
* <http://www.openoffice.org/license.html>
* for a copy of the LGPLv3 License.
*
************************************************************************/
#ifndef INCLUDED_COMPHELPER_WEAKBAG_HXX
#define INCLUDED_COMPHELPER_WEAKBAG_HXX
#include "sal/config.h"
#include <list>
#include "com/sun/star/uno/Reference.hxx"
#include "cppuhelper/weakref.hxx"
#include "osl/diagnose.h"
namespace comphelper {
/**
A bag of UNO weak references.
*/
template< typename T > class WeakBag {
public:
/**
Add a new weak reference.
The implementation keeps the amount of memory consumed linear in the
number of living references added, not linear in the number of total
references added.
@param e
a non-null reference.
*/
void add(com::sun::star::uno::Reference< T > const & e) {
OSL_ASSERT(e.is());
for (typename List::iterator i(m_list.begin()); i != m_list.end();) {
if (com::sun::star::uno::Reference< T >(*i).is()) {
++i;
} else {
i = m_list.erase(i);
}
}
m_list.push_back(com::sun::star::uno::WeakReference< T >(e));
}
/**
Remove a living reference.
@return
a living reference, or null if there are none.
*/
com::sun::star::uno::Reference< T > remove() {
while (!m_list.empty()) {
com::sun::star::uno::Reference< T > r(m_list.front());
m_list.pop_front();
if (r.is()) {
return r;
}
}
return com::sun::star::uno::Reference< T >();
}
private:
typedef std::list< com::sun::star::uno::WeakReference< T > > List;
List m_list;
};
}
#endif
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