/usr/include/camp/detail/objectholder.hpp is in libcamp-dev 0.8.1-2.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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**
** Copyright (C) 2009-2014 TEGESO/TEGESOFT and/or its subsidiary(-ies) and mother company.
** Contact: Tegesoft Information (contact@tegesoft.com)
**
** This file is part of the CAMP library.
**
** The MIT License (MIT)
**
** Copyright (C) 2009-2014 TEGESO/TEGESOFT and/or its subsidiary(-ies) and mother company.
**
** Permission is hereby granted, free of charge, to any person obtaining a copy
** of this software and associated documentation files (the "Software"), to deal
** in the Software without restriction, including without limitation the rights
** to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
** copies of the Software, and to permit persons to whom the Software is
** furnished to do so, subject to the following conditions:
**
** The above copyright notice and this permission notice shall be included in
** all copies or substantial portions of the Software.
**
** THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
** IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
** FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
** AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
** LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
** OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
** THE SOFTWARE.
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****************************************************************************/
#ifndef CAMP_DETAIL_OBJECTHOLDER_HPP
#define CAMP_DETAIL_OBJECTHOLDER_HPP
#include <camp/classget.hpp>
#include <camp/classcast.hpp>
namespace camp
{
namespace detail
{
/**
* \brief Abstract base class for object holders
*
* This class is meant to be used by UserObject.
* @todo Use an optimized memory pool if there are too many allocations of holders
*/
class AbstractObjectHolder
{
public:
/**
* \brief Destructor
*/
virtual ~AbstractObjectHolder();
/**
* \brief Return a typeless pointer to the stored object
*
* \return Pointer to the object
*/
virtual void* object() = 0;
/**
* \brief Return a holder which is able to modify its stored object
*
* The holder can return itself it it already meets the requirement,
* otherwise it may return a new holder storing a copy of its object.
*
* \return Holder storing a writable object
*/
virtual AbstractObjectHolder* getWritable() = 0;
protected:
/**
* \brief Default constructor
*/
AbstractObjectHolder();
};
/**
* \brief Typed specialization of AbstractObjectHolder for storage by const reference
*/
template <typename T>
class ObjectHolderByConstRef : public AbstractObjectHolder
{
public:
/**
* \brief Construct the holder from a const object
*
* \param object Pointer to the object to store
*/
ObjectHolderByConstRef(const T* object);
/**
* \brief Return a typeless pointer to the stored object
*
* \return Pointer to the object
*/
virtual void* object();
/**
* \brief Return a holder which is able to modify its stored object
*
* The holder can return itself it it already meets the requirement,
* otherwise it may return a new holder storing a copy of its object.
*
* \return Holder storing a writable object
*/
virtual AbstractObjectHolder* getWritable();
private:
const T* m_object; ///< Pointer to the object
void* m_alignedPtr; ///< Pointer to the actual derived part of the object (may be different than m_object in case of multiple inheritance with offset)
};
/**
* \brief Typed specialization of AbstractObjectHolder for storage by reference
*/
template <typename T>
class ObjectHolderByRef : public AbstractObjectHolder
{
public:
/**
* \brief Construct the holder from an object
*
* \param object Pointer to the object to store
*/
ObjectHolderByRef(T* object);
ObjectHolderByRef(std::shared_ptr<T>* object);
/**
* \brief Return a typeless pointer to the stored object
*
* \return Pointer to the object
*/
virtual void* object();
/**
* \brief Return a holder which is able to modify its stored object
*
* The holder can return itself it it already meets the requirement,
* otherwise it may return a new holder storing a copy of its object.
*
* \return Holder storing a writable object
*/
virtual AbstractObjectHolder* getWritable();
private:
T* m_object; ///< Pointer to the object
void* m_alignedPtr; ///< Pointer to the actual derived part of the object (may be different than m_object in case of multiple inheritance with offset)
};
/**
* \brief Typed specialization of AbstractObjectHolder for storage by copy
*/
template <typename T>
class ObjectHolderByCopy : public AbstractObjectHolder
{
public:
/**
* \brief Construct the holder from an object
*
* \param object Object to store
*/
ObjectHolderByCopy(const T* object);
/**
* \brief Return a typeless pointer to the stored object
*
* \return Pointer to the object
*/
virtual void* object();
/**
* \brief Return a holder which is able to modify its stored object
*
* The holder can return itself it it already meets the requirement,
* otherwise it may return a new holder storing a copy of its object.
*
* \return Holder storing a writable object
*/
virtual AbstractObjectHolder* getWritable();
private:
T m_object; ///< Copy of the object
};
} // namespace detail
} // namespace camp
#include <camp/detail/objectholder.inl>
#endif // CAMP_DETAIL_OBJECTHOLDER_HPP
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