/usr/include/camp/detail/valueimpl.hpp is in libcamp0.7-dev 0.7.1.3-1.
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_VALUEIMPL_HPP
#define CAMP_DETAIL_VALUEIMPL_HPP
#include <camp/type.hpp>
#include <camp/valuemapper.hpp>
#include <camp/errors.hpp>
#ifndef Q_MOC_RUN
#include <boost/variant/static_visitor.hpp>
#endif
namespace camp
{
namespace detail
{
/**
* \brief Value visitor which converts the stored value to a type T
*/
template <typename T>
struct ConvertVisitor : public boost::static_visitor<T>
{
template <typename U>
T operator()(const U& value) const
{
// Dispatch to the proper ValueConverter
return camp_ext::ValueMapper<T>::from(value);
}
T operator()(const T& value) const
{
// Optimization when source type is the same as requested type
return value;
}
T operator()(NoType) const
{
// Error: trying to convert an empty value
CAMP_ERROR(BadType(noType, mapType<T>()));
}
};
/**
* \brief Binary value visitor which compares two values using operator <
*/
struct LessThanVisitor : public boost::static_visitor<bool>
{
template <typename T, typename U>
bool operator()(const T&, const U&) const
{
// Different types : compare types identifiers
return mapType<T>() < mapType<U>();
}
template <typename T>
bool operator()(const T& v1, const T& v2) const
{
// Same types : compare values
return v1 < v2;
}
bool operator()(NoType, NoType) const
{
// No type (empty values) : they're considered equal
return false;
}
};
/**
* \brief Binary value visitor which compares two values using operator ==
*/
struct EqualVisitor : public boost::static_visitor<bool>
{
template <typename T, typename U>
bool operator()(const T&, const U&) const
{
// Different types : not equal
return false;
}
template <typename T>
bool operator()(const T& v1, const T& v2) const
{
// Same types : compare values
return v1 == v2;
}
bool operator()(NoType, NoType) const
{
// No type (empty values) : they're considered equal
return true;
}
};
} // namespace detail
} // namespace camp
#endif // CAMP_DETAIL_VALUEIMPL_HPP
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