/usr/include/camp/detail/valueprovider.hpp is in libcamp0.7-dev 0.7.1.1-1.
This file is owned by root:root, with mode 0o644.
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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_VALUEPROVIDER_HPP
#define CAMP_DETAIL_VALUEPROVIDER_HPP
#include <camp/class.hpp>
#include <camp/classget.hpp>
#include <camp/valuemapper.hpp>
namespace camp
{
namespace detail
{
/*
* Implementation of ValueProvider
* Generic version, use default constructor
*/
template <typename T, int Type>
struct ValueProviderImpl
{
T operator()() {return T();}
};
/*
* Specialization for user types: use metaclass to instanciate
* so that we get an exception rather than a compile error
* if the type has no default constructor
*/
template <typename T>
struct ValueProviderImpl<T, userType>
{
ValueProviderImpl() : m_value(classByType<T>().construct().template get<T*>()) {}
~ValueProviderImpl() {classByType<T>().destroy(m_value);}
T& operator()() {return *m_value;}
T* m_value;
};
/*
* Specialization for pointer to primitive types: use new to allocate objects
* Here we assume that the caller will take ownership of the returned value
*/
template <typename T, int Type>
struct ValueProviderImpl<T*, Type>
{
T* operator()() {return new T;}
};
/*
* Specialization for pointer to user types: use metaclass to allocate objects
* Here we assume that the caller will take ownership of the returned value
*/
template <typename T>
struct ValueProviderImpl<T*, userType>
{
T* operator()() {return classByType<T>().construct().template get<T*>();}
};
/*
* Helper structure to instanciate new values based on their type
*/
template <typename T>
struct ValueProvider : ValueProviderImpl<T, camp_ext::ValueMapper<T>::type>
{
};
} // namespace detail
} // namespace camp
#endif // CAMP_DETAIL_VALUEPROVIDER_HPP
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