/usr/include/camp/detail/getter.hpp is in libcamp0.7-dev 0.7.1.1-1.
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) 2009-2010 TECHNOGERMA Systems France and/or its subsidiary(-ies).
** Contact: Technogerma Systems France Information (contact@technogerma.fr)
**
** This file is part of the CAMP library.
**
** CAMP is free software: you can redistribute it and/or modify
** it under the terms of the GNU Lesser General Public License as published by
** the Free Software Foundation, either version 3 of the License, or
** (at your option) any later version.
**
** CAMP 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 Lesser General Public License for more details.
**
** You should have received a copy of the GNU Lesser General Public License
** along with CAMP. If not, see <http://www.gnu.org/licenses/>.
**
****************************************************************************/
#ifndef CAMP_DETAIL_GETTER_HPP
#define CAMP_DETAIL_GETTER_HPP
#include <camp/userobject.hpp>
#include <boost/function.hpp>
#include <boost/shared_ptr.hpp>
namespace camp
{
namespace detail
{
/**
* \brief Represents an abstract getter
*
* This class is an interface which must be inherited by typed specializations.
* The template parameter T is the type returned by the getter.
*
* \sa Getter, GetterImpl
*/
template <typename T>
class GetterInterface
{
public:
/**
* \brief Destructor
*/
virtual ~GetterInterface();
/**
* \brief Retrieve the value returned by the getter
*
* \param object User object to apply the getter to
*/
virtual T get(const UserObject& object) const = 0;
};
/**
* \brief Typed implementation of GetterInterface
*/
template <typename T, typename C>
class GetterImpl : public GetterInterface<T>
{
public:
/**
* \brief Construct the getter implementation from a function
*/
GetterImpl(boost::function<T (C&)> function);
/**
* \see GetterInterface::get
*/
virtual T get(const UserObject& object) const;
private:
boost::function<T (C&)> m_function; ///< Function object storing the actual getter
};
/**
* \brief Generic getter which can be applied to user objects
*
* This class models a Getter as a non-member function; this way it can be
* used without knowledge about the actual owner class, and be applied
* uniformly to user objects.
*
* Getter can be built upon any kind of callable type or a constant value.
* The template parameter T is the type returned by the getter.
*
* \sa UserObject, GetterInterface
*/
template <typename T>
class Getter
{
public:
/**
* \brief Construct the getter from a constant value
*
* This value will be returned either if no object is passed, or if no getter function has been defined
*
* \param defaultValue Value to return if no function has been set (default value of T by default)
*/
Getter(const T& defaultValue = T());
/**
* \brief Construct the getter from a function
*
* \param function Function object storing the actual getter
*/
template <typename C>
Getter(boost::function<T (C&)> function);
/**
* \brief Get the default value of the getter
*
* \return Constant stored in the getter
*/
const T& get() const;
/**
* \brief Retrieve the value returned by the getter
*
* If no function has been set, it's equivalent to calling Getter::get().
*
* \param object User object to apply the getter to
*
* \return Value returned by the getter
*/
T get(const UserObject& object) const;
private:
boost::shared_ptr<GetterInterface<T> > m_getter; ///< Implementation of the getter
T m_defaultValue; ///< Default value to return if no function or no object is specified
};
} // namespace detail
} // namespace camp
#include <camp/detail/getter.inl>
#endif // CAMP_DETAIL_GETTER_HPP
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