home *** CD-ROM | disk | FTP | other *** search
- #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
-
-