williamr@2: #ifndef BOOST_SERIALIZATION_NVP_HPP
williamr@2: #define BOOST_SERIALIZATION_NVP_HPP
williamr@2: 
williamr@2: // MS compatible compilers support #pragma once
williamr@2: #if defined(_MSC_VER) && (_MSC_VER >= 1020)
williamr@2: # pragma once
williamr@2: #endif
williamr@2: 
williamr@2: /////////1/////////2/////////3/////////4/////////5/////////6/////////7/////////8
williamr@2: // nvp.hpp: interface for serialization system.
williamr@2: 
williamr@2: // (C) Copyright 2002 Robert Ramey - http://www.rrsd.com . 
williamr@2: // Use, modification and distribution is subject to the Boost Software
williamr@2: // License, Version 1.0. (See accompanying file LICENSE_1_0.txt or copy at
williamr@2: // http://www.boost.org/LICENSE_1_0.txt)
williamr@2: 
williamr@2: //  See http://www.boost.org for updates, documentation, and revision history.
williamr@2: 
williamr@2: #include <utility>
williamr@2: 
williamr@2: #include <boost/config.hpp>
williamr@2: #include <boost/detail/workaround.hpp>
williamr@2: // supress noise
williamr@2: #if BOOST_WORKAROUND(BOOST_MSVC, <= 1200)
williamr@2: # pragma warning (disable : 4786) // too long name, harmless warning
williamr@2: #endif
williamr@2: 
williamr@2: #include <boost/mpl/integral_c.hpp>
williamr@2: #include <boost/mpl/integral_c_tag.hpp>
williamr@2: 
williamr@2: #include <boost/serialization/level.hpp>
williamr@2: #include <boost/serialization/tracking.hpp>
williamr@2: #include <boost/serialization/split_member.hpp>
williamr@2: #include <boost/serialization/base_object.hpp>
williamr@2: #include <boost/serialization/traits.hpp>
williamr@2: 
williamr@2: namespace boost {
williamr@2: namespace serialization {
williamr@2: 
williamr@2: template<class T>
williamr@2: struct nvp : 
williamr@2:     public std::pair<const char *, T *>,
williamr@2:     public traits<nvp<T>, object_serializable, track_never>
williamr@2: {
williamr@2:     explicit nvp(const char * name, T & t) :
williamr@2:         // note: redundant cast works around borland issue
williamr@2:         std::pair<const char *, T *>(name, (T*)(& t))
williamr@2:     {}
williamr@2:     nvp(const nvp & rhs) : 
williamr@2:         // note: redundant cast works around borland issue
williamr@2:         std::pair<const char *, T *>(rhs.first, (T*)rhs.second)
williamr@2:     {}
williamr@2: 
williamr@2:     const char * name() const {
williamr@2:         return this->first;
williamr@2:     }
williamr@2:     T & value() const {
williamr@2:         return *(this->second);
williamr@2:     }
williamr@2: 
williamr@2:     const T & const_value() const {
williamr@2:         return *(this->second);
williamr@2:     }
williamr@2: 
williamr@2:     // True64 compiler complains with a warning about the use of
williamr@2:     // the name "Archive" hiding some higher level usage.  I'm sure this
williamr@2:     // is an error but I want to accomodated as it generates a long warning
williamr@2:     // listing and might be related to a lot of test failures.
williamr@2:     // default treatment for name-value pairs. The name is
williamr@2:     // just discarded and only the value is serialized. 
williamr@2:     template<class Archivex>
williamr@2:     void save(
williamr@2:         Archivex & ar, 
williamr@2:         const unsigned int /* file_version */
williamr@2:     ) const {
williamr@2:         // CodeWarrior 8.x can't seem to resolve the << op for a rhs of "const T *"
williamr@2:         ar.operator<<(const_value());
williamr@2:     }
williamr@2:     template<class Archivex>
williamr@2:     void load(
williamr@2:         Archivex & ar, 
williamr@2:         const unsigned int /* file_version */
williamr@2:     ){
williamr@2:         // CodeWarrior 8.x can't seem to resolve the >> op for a rhs of "const T *"
williamr@2:         ar.operator>>(value());
williamr@2:     }
williamr@2:     BOOST_SERIALIZATION_SPLIT_MEMBER()
williamr@2: };
williamr@2: 
williamr@2: template<class T>
williamr@2: inline
williamr@2: #ifndef BOOST_NO_FUNCTION_TEMPLATE_ORDERING
williamr@2: const
williamr@2: #endif
williamr@2: nvp<T> make_nvp(const char * name, T & t){
williamr@2:     return nvp<T>(name, t);
williamr@2: }
williamr@2: 
williamr@2: // to maintain efficiency and portability, we want to assign
williamr@2: // specific serialization traits to all instances of this wrappers.
williamr@2: // we can't strait forward method below as it depends upon
williamr@2: // Partial Template Specialization and doing so would mean that wrappers
williamr@2: // wouldn't be treated the same on different platforms.  This would
williamr@2: // break archive portability. Leave this here as reminder not to use it !!!
williamr@2: #if 0 // #ifndef BOOST_NO_TEMPLATE_PARTIAL_SPECIALIZATION
williamr@2: 
williamr@2: template <class T>
williamr@2: struct implementation_level<nvp<T> >
williamr@2: {
williamr@2:     typedef mpl::integral_c_tag tag;
williamr@2:     typedef mpl::int_<object_serializable> type;
williamr@2:     BOOST_STATIC_CONSTANT(int, value = implementation_level::type::value);
williamr@2: };
williamr@2: 
williamr@2: // nvp objects are generally created on the stack and are never tracked
williamr@2: template<class T>
williamr@2: struct tracking_level<nvp<T> >
williamr@2: {
williamr@2:     typedef mpl::integral_c_tag tag;
williamr@2:     typedef mpl::int_<track_never> type;
williamr@2:     BOOST_STATIC_CONSTANT(int, value = tracking_level::type::value);
williamr@2: };
williamr@2: 
williamr@2: #endif
williamr@2: 
williamr@2: } // seralization
williamr@2: } // boost
williamr@2: 
williamr@2: #include <boost/preprocessor/stringize.hpp>
williamr@2: 
williamr@2: #define BOOST_SERIALIZATION_NVP(name)                              \
williamr@2:     boost::serialization::make_nvp(BOOST_PP_STRINGIZE(name), name)
williamr@2: /**/
williamr@2: 
williamr@2: #define BOOST_SERIALIZATION_BASE_OBJECT_NVP(name)                  \
williamr@2:     boost::serialization::make_nvp(                                \
williamr@2:         BOOST_PP_STRINGIZE(name),                                  \
williamr@2:         boost::serialization::base_object<name >(*this)            \
williamr@2:     )
williamr@2: /**/
williamr@2: 
williamr@2: #endif // BOOST_SERIALIZATION_NVP_HPP