/usr/include/camp/detail/objecttraits.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_OBJECTTRAITS_HPP
#define CAMP_DETAIL_OBJECTTRAITS_HPP
#include <camp/detail/rawtype.hpp>
#include <camp/detail/issmartpointer.hpp>
#include <boost/type_traits/is_const.hpp>
#include <boost/type_traits/is_pointer.hpp>
#include <boost/utility/enable_if.hpp>
namespace camp
{
namespace detail
{
/**
* \class ObjectTraits
*
* \brief Utility class which gives compile-time informations about the semantics of a type
*
* It provides the following constants:
*
* \li isWritable: true if the type allows to modify the object (non-const references and pointers)
* \li isRef: true if the type is a reference type (references and pointers)
*
* ... the following types:
*
* \li RefReturnType: the reference type closest to T which allows to have direct access to the object (T& for raw types and references, T* for pointer types)
* \li PointerType: the pointer type closest to T which allows to have direct access to the object (T*)
* \li DataType: the actual raw type of the object (removes all indirections, as well const and reference modifiers)
*
* ... and the following functions:
*
* \li get(void*): get a direct access to an object given by a typeless pointer (in other words, converts from void* to RefReturnType)
* \li getPointer(T): get a direct pointer to an object, regardless its original storage / modifiers (in other words, convert from T to PointerType)
*/
/*
* Generic version -- raw types
*/
template <typename T, typename E = void>
struct ObjectTraits
{
enum
{
isWritable = false,
isRef = false
};
typedef T& RefReturnType;
typedef typename RawType<T>::Type DataType;
static RefReturnType get(void* pointer) {return *static_cast<T*>(pointer);}
};
/*
* Specialized version for raw pointers
*/
template <typename T>
struct ObjectTraits<T*>
{
enum
{
isWritable = !boost::is_const<T>::value,
isRef = true
};
typedef T* RefReturnType;
typedef T* PointerType;
typedef typename RawType<T>::Type DataType;
static RefReturnType get(void* pointer) {return static_cast<T*>(pointer);}
static PointerType getPointer(T* value) {return value;}
};
/*
* Specialized version for smart pointers
*/
template <template <typename> class T, typename U>
struct ObjectTraits<T<U>, typename boost::enable_if<IsSmartPointer<T<U>, U> >::type>
{
enum
{
isWritable = !boost::is_const<U>::value,
isRef = true
};
typedef U* RefReturnType;
typedef U* PointerType;
typedef typename RawType<U>::Type DataType;
static RefReturnType get(void* pointer) {return static_cast<U*>(pointer);}
static PointerType getPointer(T<U> value) {return boost::get_pointer(value);}
};
/*
* Specialized version for built-in arrays
*/
template <typename T, int N>
struct ObjectTraits<T[N]>
{
enum
{
isWritable = false,
isRef = true
};
typedef T(&RefReturnType)[N];
typedef typename RawType<T>::Type DataType;
};
/*
* Specialized version for references to non-ref types
*/
template <typename T>
struct ObjectTraits<T&, typename boost::disable_if<boost::is_pointer<typename ObjectTraits<T>::RefReturnType> >::type>
{
enum
{
isWritable = !boost::is_const<T>::value,
isRef = true
};
typedef T& RefReturnType;
typedef T* PointerType;
typedef typename RawType<T>::Type DataType;
static RefReturnType get(void* pointer) {return *static_cast<T*>(pointer);}
static PointerType getPointer(T& value) {return &value;}
};
/*
* Specialized version for references to ref types -- just remove the reference modifier
*/
template <typename T>
struct ObjectTraits<T&, typename boost::enable_if<boost::is_pointer<typename ObjectTraits<T>::RefReturnType> >::type> : ObjectTraits<T>
{
};
/*
* Specialized version for types with const modifier -- just remove it
*/
template <typename T>
struct ObjectTraits<const T> : ObjectTraits<T>
{
};
} // namespace detail
} // namespace camp
#endif // CAMP_DETAIL_OBJECTTRAITS_HPP
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