1#ifndef BOOST_SERIALIZATION_NVP_HPP
2#define BOOST_SERIALIZATION_NVP_HPP
3
4// MS compatible compilers support #pragma once
5#if defined(_MSC_VER)
6# pragma once
7#endif
8
9/////////1/////////2/////////3/////////4/////////5/////////6/////////7/////////8
10// nvp.hpp: interface for serialization system.
11
12// (C) Copyright 2002 Robert Ramey - http://www.rrsd.com .
13// Use, modification and distribution is subject to the Boost Software
14// License, Version 1.0. (See accompanying file LICENSE_1_0.txt or copy at
15// http://www.boost.org/LICENSE_1_0.txt)
16
17// See http://www.boost.org for updates, documentation, and revision history.
18
19#include <utility>
20
21#include <boost/config.hpp>
22#include <boost/detail/workaround.hpp>
23
24#include <boost/serialization/level.hpp>
25#include <boost/serialization/tracking.hpp>
26#include <boost/serialization/split_member.hpp>
27#include <boost/serialization/base_object.hpp>
28#include <boost/serialization/traits.hpp>
29#include <boost/serialization/wrapper.hpp>
30
31namespace boost {
32namespace serialization {
33
34template<class T>
35struct nvp :
36 public std::pair<const char *, T *>,
37 public wrapper_traits<const nvp< T > >
38{
39//private:
40 nvp(const nvp & rhs) :
41 std::pair<const char *, T *>(rhs.first, rhs.second)
42 {}
43public:
44 explicit nvp(const char * name_, T & t) :
45 // note: added _ to suppress useless gcc warning
46 std::pair<const char *, T *>(name_, & t)
47 {}
48
49 const char * name() const {
50 return this->first;
51 }
52 T & value() const {
53 return *(this->second);
54 }
55
56 const T & const_value() const {
57 return *(this->second);
58 }
59
60 template<class Archive>
61 void save(
62 Archive & ar,
63 const unsigned int /* file_version */
64 ) const {
65 ar.operator<<(const_value());
66 }
67 template<class Archive>
68 void load(
69 Archive & ar,
70 const unsigned int /* file_version */
71 ){
72 ar.operator>>(value());
73 }
74 BOOST_SERIALIZATION_SPLIT_MEMBER()
75};
76
77template<class T>
78inline
79const nvp< T > make_nvp(const char * name, T & t){
80 return nvp< T >(name, t);
81}
82
83// to maintain efficiency and portability, we want to assign
84// specific serialization traits to all instances of this wrappers.
85// we can't strait forward method below as it depends upon
86// Partial Template Specialization and doing so would mean that wrappers
87// wouldn't be treated the same on different platforms. This would
88// break archive portability. Leave this here as reminder not to use it !!!
89
90template <class T>
91struct implementation_level<nvp< T > >
92{
93 typedef mpl::integral_c_tag tag;
94 typedef mpl::int_<object_serializable> type;
95 BOOST_STATIC_CONSTANT(int, value = implementation_level::type::value);
96};
97
98// nvp objects are generally created on the stack and are never tracked
99template<class T>
100struct tracking_level<nvp< T > >
101{
102 typedef mpl::integral_c_tag tag;
103 typedef mpl::int_<track_never> type;
104 BOOST_STATIC_CONSTANT(int, value = tracking_level::type::value);
105};
106
107} // seralization
108} // boost
109
110#include <boost/preprocessor/stringize.hpp>
111
112#define BOOST_SERIALIZATION_NVP(name) \
113 boost::serialization::make_nvp(BOOST_PP_STRINGIZE(name), name)
114/**/
115
116#define BOOST_SERIALIZATION_BASE_OBJECT_NVP(name) \
117 boost::serialization::make_nvp( \
118 BOOST_PP_STRINGIZE(name), \
119 boost::serialization::base_object<name >(*this) \
120 )
121/**/
122
123#endif // BOOST_SERIALIZATION_NVP_HPP
124