weakref.hxx

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/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
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 * License, v. 2.0. If a copy of the MPL was not distributed with this
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 *
 * 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
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/*
 * This file is part of LibreOffice published API.
 */
#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;

class CPPUHELPER_DLLPUBLIC WeakReferenceHelper
{
public:
    WeakReferenceHelper()
        : m_pImpl( NULL )
        {}

    WeakReferenceHelper( const WeakReferenceHelper & rWeakRef );

#if defined LIBO_INTERNAL_ONLY
    WeakReferenceHelper(WeakReferenceHelper && other) noexcept : m_pImpl(other.m_pImpl)
    { other.m_pImpl = nullptr; }
#endif

    WeakReferenceHelper( const css::uno::Reference< css::uno::XInterface > & xInt );

    ~WeakReferenceHelper();

    WeakReferenceHelper & SAL_CALL operator = ( const WeakReferenceHelper & rWeakRef );

#if defined LIBO_INTERNAL_ONLY
    WeakReferenceHelper & SAL_CALL operator =(WeakReferenceHelper && other);
#endif

    WeakReferenceHelper & SAL_CALL operator = (
            const css::uno::Reference< css::uno::XInterface > & xInt );

    bool SAL_CALL operator == ( const WeakReferenceHelper & rObj ) const
        { return (get() == rObj.get()); }

    css::uno::Reference< css::uno::XInterface > SAL_CALL get() const;

    SAL_CALL operator Reference< XInterface > () const
        { return get(); }

    void SAL_CALL clear();

protected:
    OWeakRefListener * m_pImpl;
};

template< class interface_type >
class SAL_WARN_UNUSED WeakReference : public WeakReferenceHelper
{
public:
    WeakReference()
        : WeakReferenceHelper()
        {}

    WeakReference( const Reference< interface_type > & rRef )
        : WeakReferenceHelper( rRef )
        {}

    WeakReference & SAL_CALL operator = (
            const css::uno::Reference< interface_type > & xInt )
        { WeakReferenceHelper::operator=(xInt); return *this; }

#if defined LIBO_INTERNAL_ONLY
    WeakReference & SAL_CALL operator = (
            css::uno::Reference< interface_type > && xInt )
        { WeakReferenceHelper::operator=(std::move(xInt)); return *this; }
#endif

    SAL_CALL operator Reference< interface_type > () const
        { return Reference< interface_type >::query( get() ); }
};

}
}
}
}

#endif

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