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pipeline_data.h
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2008-11-14
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#ifndef K3DSDK_PIPELINE_DATA_H
#define K3DSDK_PIPELINE_DATA_H
// K-3D
// Copyright (c) 1995-2008, Timothy M. Shead
//
// Contact: tshead@k-3d.com
//
// This program is free software; you can redistribute it and/or
// modify it under the terms of the GNU General Public
// License as published by the Free Software Foundation; either
// version 2 of the License, or (at your option) any later version.
//
// This program 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
// General Public License for more details.
//
// You should have received a copy of the GNU General Public
// License along with this program; if not, write to the Free Software
// Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
/** \file
\author Tim Shead (tshead@k-3d.com)
*/
#include "types.h"
#include <boost/shared_ptr.hpp>
namespace k3d
{
template<typename T>
class pipeline_data_traits
{
public:
static T* create()
{
return new T();
}
static T* clone(const T& Other)
{
return new T(Other);
}
};
template<typename T>
class pipeline_data
{
public:
typedef T value_type;
typedef T element_type;
pipeline_data() :
originator(false)
{
}
pipeline_data(const pipeline_data<T>& Other) :
storage(Other.storage),
originator(false)
{
}
pipeline_data(T* Other) :
storage(Other),
originator(true)
{
}
T& create()
{
storage.reset(pipeline_data_traits<T>::create());
originator = storage.get() ? true : false;
return *storage;
}
T& create(T* Instance)
{
storage.reset(Instance);
originator = storage.get() ? true : false;
return *storage;
}
template<typename Y>
T& create(Y* Instance)
{
storage.reset(Instance);
originator = storage.get() ? true : false;
return *storage;
}
void reset()
{
storage.reset();
originator = false;
}
const T& operator*() const
{
return *storage;
}
const T* operator->() const
{
return storage.operator->();
}
const T* get() const
{
return storage.get();
}
T& writable()
{
if(originator)
return *storage;
storage.reset(pipeline_data_traits<T>::clone(*storage));
originator = true;
return *storage;
}
long use_count() const
{
return storage.use_count();
}
pipeline_data& operator=(const pipeline_data& Other)
{
storage = Other.storage;
originator = false;
return *this;
}
operator bool() const
{
return storage;
}
bool operator!() const
{
return !storage;
}
private:
typedef boost::shared_ptr<T> storage_type;
storage_type storage;
bool_t originator;
};
} // namespace k3d
#endif // !K3DSDK_PIPELINE_DATA_H