ref.hxx

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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 .
 */

/*
 * This file is part of LibreOffice published API.
 */

#ifndef INCLUDED_RTL_REF_HXX
#define INCLUDED_RTL_REF_HXX

#include "sal/config.h"

#include <cassert>
#include <cstddef>
#include <functional>
#ifdef LIBO_INTERNAL_ONLY
#include <type_traits>
#include "com/sun/star/uno/Reference.h"
#endif

#include "sal/types.h"

namespace rtl
{

template <class reference_type>
class Reference
{
    reference_type * m_pBody;


public:
    Reference()
        : m_pBody (NULL)
    {}


    Reference (reference_type * pBody, __sal_NoAcquire)
        : m_pBody (pBody)
    {
    }

    Reference (reference_type * pBody)
        : m_pBody (pBody)
    {
        if (m_pBody)
            m_pBody->acquire();
    }

    Reference (const Reference<reference_type> & handle)
        : m_pBody (handle.m_pBody)
    {
        if (m_pBody)
            m_pBody->acquire();
    }

#ifdef LIBO_INTERNAL_ONLY

    Reference (Reference<reference_type> && handle) noexcept
        : m_pBody (handle.m_pBody)
    {
        handle.m_pBody = nullptr;
    }
#endif

#if defined LIBO_INTERNAL_ONLY

    template< class derived_type >
    inline Reference(
        const Reference< derived_type > & rRef,
        std::enable_if_t<std::is_base_of_v<reference_type, derived_type>, int> = 0 )
        : m_pBody (rRef.get())
    {
        if (m_pBody)
            m_pBody->acquire();
    }

    template< class super_type,
        std::enable_if_t<std::is_base_of_v<super_type, reference_type>, int> = 0 >
    inline operator css::uno::Reference<super_type>() const
    {
        return css::uno::Reference<super_type>(m_pBody);
    }
#endif

    ~Reference() COVERITY_NOEXCEPT_FALSE
    {
        if (m_pBody)
            m_pBody->release();
    }

    Reference<reference_type> &
    SAL_CALL set (reference_type * pBody)
    {
        if (pBody)
            pBody->acquire();
        reference_type * const pOld = m_pBody;
        m_pBody = pBody;
        if (pOld)
            pOld->release();
        return *this;
    }

    Reference<reference_type> &
    SAL_CALL operator= (const Reference<reference_type> & handle)
    {
        return set( handle.m_pBody );
    }

#ifdef LIBO_INTERNAL_ONLY

    Reference<reference_type> &
    operator= (Reference<reference_type> && handle)
    {
        // self-movement guts ourself
        if (m_pBody)
            m_pBody->release();
        m_pBody = handle.m_pBody;
        handle.m_pBody = nullptr;
        return *this;
    }
#endif

    Reference<reference_type> &
    SAL_CALL operator= (reference_type * pBody)
    {
        return set( pBody );
    }

    Reference<reference_type> & SAL_CALL clear()
    {
        if (m_pBody)
        {
            reference_type * const pOld = m_pBody;
            m_pBody = NULL;
            pOld->release();
        }
        return *this;
    }


    reference_type * SAL_CALL get() const
    {
        return m_pBody;
    }


    reference_type * SAL_CALL operator->() const
    {
        assert(m_pBody != NULL);
        return m_pBody;
    }


    reference_type & SAL_CALL operator*() const
    {
        assert(m_pBody != NULL);
        return *m_pBody;
    }


    bool SAL_CALL is() const
    {
        return (m_pBody != NULL);
    }

#if defined LIBO_INTERNAL_ONLY

    explicit operator bool() const
    {
        return is();
    }
#endif

    bool SAL_CALL operator== (const reference_type * pBody) const
    {
        return (m_pBody == pBody);
    }


    bool
    SAL_CALL operator== (const Reference<reference_type> & handle) const
    {
        return (m_pBody == handle.m_pBody);
    }


    bool
    SAL_CALL operator!= (const Reference<reference_type> & handle) const
    {
        return (m_pBody != handle.m_pBody);
    }


    bool
    SAL_CALL operator< (const Reference<reference_type> & handle) const
    {
        return (m_pBody < handle.m_pBody);
    }


    bool
    SAL_CALL operator> (const Reference<reference_type> & handle) const
    {
        return (m_pBody > handle.m_pBody);
    }
};

} // namespace rtl

#if defined LIBO_INTERNAL_ONLY
namespace std
{


template<typename T>
struct hash<::rtl::Reference<T>>
{
    std::size_t operator()(::rtl::Reference<T> const & s) const
    { return std::size_t(s.get()); }
};

}

#endif

#endif /* ! INCLUDED_RTL_REF_HXX */

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