boost/serialization/nvp.hpp
#ifndef BOOST_SERIALIZATION_NVP_HPP
#define BOOST_SERIALIZATION_NVP_HPP
// MS compatible compilers support #pragma once
#if defined(_MSC_VER) && (_MSC_VER >= 1020)
# pragma once
#endif
/////////1/////////2/////////3/////////4/////////5/////////6/////////7/////////8
// nvp.hpp: interface for serialization system.
// (C) Copyright 2002 Robert Ramey - http://www.rrsd.com .
// Use, modification and distribution is subject to the Boost Software
// License, Version 1.0. (See accompanying file LICENSE_1_0.txt or copy at
// http://www.boost.org/LICENSE_1_0.txt)
// See http://www.boost.org for updates, documentation, and revision history.
#include <utility>
#include <boost/config.hpp>
#include <boost/serialization/traits.hpp>
#include <boost/serialization/level.hpp>
#include <boost/serialization/tracking.hpp>
#include <boost/serialization/base_object.hpp>
namespace boost {
namespace serialization {
template<class T>
struct nvp :
public std::pair<const char *, T *>,
public traits<nvp<T>, object_serializable, track_never>
{
explicit nvp(const char * name, T & t) :
// note: rudundant cast works around borland issue
std::pair<const char *, T *>(name, (T*)(& t))
{}
nvp(const nvp & rhs) :
// note: rudundant cast works around borland issue
std::pair<const char *, T *>(rhs.first, (T*)rhs.second)
{}
const char * name() const {
return this->first;
}
T & value() const {
return *(this->second);
}
// default treatment for name-value pairs. The name is
// just discarded and only the value is serialized. Note the unusual
// fact that his is "const". This is because wrappers themselves are
// in fact "const" - even though the things they wrap may not be.
template<class Archive>
void serialize(Archive & ar, const unsigned int /* file_version */) const
{
ar & value();
}
};
template<class T>
inline nvp<T> make_nvp(const char * name, T & t){
return nvp<T>(name, t);
}
// to maintain efficiency and portability, we want to assign
// specific serialization traits to all instances of this wrappers.
// we can't strait forward method below as it depends upon
// Partial Template Specialization and doing so would mean that wrappers
// wouldn't be treated the same on different platforms. This would
// break archive portability. Leave this here as reminder not to use it !!!
#if 0 // #ifndef BOOST_NO_TEMPLATE_PARTIAL_SPECIALIZATION
template <class T>
struct implementation_level<nvp<T> >
{
typedef mpl::integral_c_tag tag;
typedef mpl::int_<object_serializable> type;
BOOST_STATIC_CONSTANT(int, value = implementation_level::type::value);
};
// nvp objects are generally created on the stack and are never tracked
template<class T>
struct tracking_level<nvp<T> >
{
typedef mpl::integral_c_tag tag;
typedef mpl::int_<track_never> type;
BOOST_STATIC_CONSTANT(int, value = tracking_level::type::value);
};
#endif
} // seralization
} // boost
#include <boost/preprocessor/stringize.hpp>
#define BOOST_SERIALIZATION_NVP(name) \
boost::serialization::make_nvp(BOOST_PP_STRINGIZE(name), name)
/**/
#define BOOST_SERIALIZATION_BASE_OBJECT_NVP(name) \
boost::serialization::make_nvp( \
BOOST_PP_STRINGIZE(name), \
boost::serialization::base_object<name >(*this) \
)
/**/
#endif // BOOST_SERIALIZATION_NVP_HPP