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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_VCL_REFERENCE_HXX
#define INCLUDED_VCL_REFERENCE_HXX
#include <rtl/ref.hxx>
/// @cond INTERNAL
namespace vcl { namespace detail {
// A mechanism to enable up-casts, used by the VclReference conversion constructor,
// heavily borrowed from boost::is_base_and_derived
// (which manages to avoid compilation problems with ambiguous bases and cites
// comp.lang.c++.moderated mail <http://groups.google.com/groups?
// selm=df893da6.0301280859.522081f7%40posting.google.com> "SuperSubclass
// (is_base_and_derived) complete implementation!" by Rani Sharoni and cites
// Aleksey Gurtovoy for the workaround for MSVC), to avoid including Boost
// headers in URE headers (could ultimately be based on C++11 std::is_base_of):
template< typename T1, typename T2 > struct UpCast {
private:
template< bool, typename U1, typename > struct C
{ typedef U1 t; };
template< typename U1, typename U2 > struct C< false, U1, U2 >
{ typedef U2 t; };
struct S { char c[2]; };
#if defined _MSC_VER
static char f(T2 *, long);
static S f(T1 * const &, int);
#else
template< typename U > static char f(T2 *, U);
static S f(T1 *, int);
#endif
struct H {
H(); // avoid C2514 "class has no constructors" from MSVC 2008
#if defined _MSC_VER
operator T1 * const & () const;
#else
operator T1 * () const;
#endif
operator T2 * ();
};
public:
typedef typename C< sizeof (f(H(), 0)) == 1, void *, void >::t t;
};
}; }; // namespace detail, namespace vcl
/**
* A thin wrapper around rtl::Reference to implement the acquire and dispose semantics we want for references to vcl::Window subclasses.
* @param reference_type must be a subclass of vcl::Window
*/
template <class reference_type>
class VclReference
{
::rtl::Reference<reference_type> m_rInnerRef;
public:
/** Constructor...
*/
inline VclReference()
: m_rInnerRef()
{}
/** Constructor...
*/
inline VclReference (reference_type * pBody)
: m_rInnerRef(pBody)
{}
/** Copy constructor...
*/
inline VclReference (const VclReference<reference_type> & handle)
: m_rInnerRef (handle.m_rInnerRef)
{}
/** Up-casting conversion constructor: Copies interface reference.
Does not work for up-casts to ambiguous bases. For the special case of
up-casting to Reference< XInterface >, see the corresponding conversion
operator.
@param rRef another reference
*/
template< class derived_type >
inline VclReference(
const VclReference< derived_type > & rRef,
typename ::vcl::detail::UpCast< reference_type, derived_type >::t = 0 )
: m_rInnerRef( static_cast<reference_type*>(rRef) )
{
}
/** Probably most common used: handle->someBodyOp().
*/
inline reference_type * SAL_CALL operator->() const
{
return m_rInnerRef.get();
}
/** Get the body. Can be used instead of operator->().
I.e. handle->someBodyOp() and handle.get()->someBodyOp()
are the same.
*/
inline reference_type * SAL_CALL get() const
{
return m_rInnerRef.get();
}
inline SAL_CALL operator reference_type * () const
{
return m_rInnerRef.get();
}
inline SAL_CALL operator bool () const
{
return m_rInnerRef.get() != NULL;
}
inline void disposeAndClear()
{
// hold it alive for the lifetime of this method
::rtl::Reference<reference_type> aTmp(m_rInnerRef);
m_rInnerRef.clear(); // we should use some 'swap' method ideally ;-)
if (aTmp.get())
aTmp->dispose();
}
}; // class VclReference
#endif // INCLUDED_VCL_REFERENCE_HXX
/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
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