/usr/include/simgear/nasal/cppbind/NasalObjectHolder.hxx is in libsimgear-dev 3.4.0-3.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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/// Wrapper class for keeping Nasal objects save from the garbage collector.
//
// Copyright (C) 2013 Thomas Geymayer <tomgey@gmail.com>
//
// This library is free software; you can redistribute it and/or
// modify it under the terms of the GNU Library General Public
// License as published by the Free Software Foundation; either
// version 2 of the License, or (at your option) any later version.
//
// This library 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
// Library General Public License for more details.
//
// You should have received a copy of the GNU Library General Public
// License along with this library; if not, write to the Free Software
// Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA
#ifndef SG_NASAL_OBJECT_HOLDER_HXX_
#define SG_NASAL_OBJECT_HOLDER_HXX_
#include <simgear/nasal/nasal.h>
#include <simgear/structure/SGSharedPtr.hxx>
namespace nasal
{
/**
* Usable for example as empty base class if a base class is required.(Eg. as
* parameter for a mixin class).
*/
struct empty_class {};
/**
* Prevent a Nasal object from being destroyed by the garbage collector during
* the lifetime of this object.
*/
template<class Base = empty_class>
class ObjectHolder:
public Base
{
public:
/**
* @param obj Object to save
*/
explicit ObjectHolder(naRef obj);
/**
*
*/
ObjectHolder();
/**
*
*/
~ObjectHolder();
/**
* Get captured Nasal object
*/
naRef get_naRef() const;
/**
* Release the managed object
*/
void reset();
/**
* Replaces the managed object (the old object is released)
*
* @param obj New object to save
*/
void reset(naRef obj);
/**
* Check if there is a managed object
*/
bool valid() const;
/**
* Save the given object as long as the returned holder exists.
*
* @param obj Object to save
*/
static SGSharedPtr<ObjectHolder<Base> > makeShared(naRef obj);
protected:
naRef _ref;
int _gc_key;
};
//----------------------------------------------------------------------------
template<class Base>
ObjectHolder<Base>::~ObjectHolder()
{
if( !naIsNil(_ref) )
naGCRelease(_gc_key);
}
//----------------------------------------------------------------------------
template<class Base>
naRef ObjectHolder<Base>::get_naRef() const
{
return _ref;
}
//----------------------------------------------------------------------------
template<class Base>
void ObjectHolder<Base>::reset()
{
if( !naIsNil(_ref) )
naGCRelease(_gc_key);
_ref = naNil();
_gc_key = 0;
}
//----------------------------------------------------------------------------
template<class Base>
void ObjectHolder<Base>::reset(naRef obj)
{
if( !naIsNil(_ref) )
naGCRelease(_gc_key);
_ref = obj;
_gc_key = naGCSave(obj);
}
//----------------------------------------------------------------------------
template<class Base>
bool ObjectHolder<Base>::valid() const
{
return !naIsNil(_ref);
}
//----------------------------------------------------------------------------
template<class Base>
ObjectHolder<Base>::ObjectHolder(naRef obj):
_ref(obj),
_gc_key(0)
{
if( !naIsNil(obj) )
naGCSave(obj);
}
//----------------------------------------------------------------------------
template<class Base>
ObjectHolder<Base>::ObjectHolder():
_ref(naNil()),
_gc_key(0)
{
}
//----------------------------------------------------------------------------
template<class Base>
SGSharedPtr<ObjectHolder<Base> >
ObjectHolder<Base>::makeShared(naRef obj)
{
return SGSharedPtr<ObjectHolder<Base> >( new ObjectHolder<SGReferenced>(obj) );
}
} // namespace nasal
#endif /* SG_NASAL_OBJECT_HOLDER_HXX_ */
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