1 /////////1/////////2/////////3/////////4/////////5/////////6/////////7/////////8
2
3 // (C) Copyright 2002-4 Pavel Vozenilek .
4 // Use, modification and distribution is subject to the Boost Software
5 // License, Version 1.0. (See accompanying file LICENSE_1_0.txt or copy at
6 // http://www.boost.org/LICENSE_1_0.txt)
7
8 // Provides non-intrusive serialization for boost::optional.
9
10 #ifndef BOOST_SERIALIZATION_OPTIONAL_HPP_
11 #define BOOST_SERIALIZATION_OPTIONAL_HPP_
12
13 #if defined(_MSC_VER)
14 # pragma once
15 #endif
16
17 #include <boost/config.hpp>
18
19 #include <boost/optional.hpp>
20 #include <boost/move/utility_core.hpp>
21
22 #include <boost/serialization/item_version_type.hpp>
23 #include <boost/serialization/split_free.hpp>
24 #include <boost/serialization/level.hpp>
25 #include <boost/serialization/nvp.hpp>
26 #include <boost/serialization/library_version_type.hpp>
27 #include <boost/type_traits/is_pointer.hpp>
28 #include <boost/serialization/detail/stack_constructor.hpp>
29 #include <boost/serialization/detail/is_default_constructible.hpp>
30 #include <boost/serialization/force_include.hpp>
31
32 // function specializations must be defined in the appropriate
33 // namespace - boost::serialization
34 namespace boost {
35 namespace serialization {
36
37 template<class Archive, class T>
save(Archive & ar,const boost::optional<T> & t,const unsigned int)38 void save(
39 Archive & ar,
40 const boost::optional< T > & t,
41 const unsigned int /*version*/
42 ){
43 // It is an inherent limitation to the serialization of optional.hpp
44 // that the underlying type must be either a pointer or must have a
45 // default constructor. It's possible that this could change sometime
46 // in the future, but for now, one will have to work around it. This can
47 // be done by serialization the optional<T> as optional<T *>
48 #if ! defined(BOOST_NO_CXX11_HDR_TYPE_TRAITS)
49 BOOST_STATIC_ASSERT(
50 boost::serialization::detail::is_default_constructible<T>::value
51 || boost::is_pointer<T>::value
52 );
53 #endif
54 const bool tflag = t.is_initialized();
55 ar << boost::serialization::make_nvp("initialized", tflag);
56 if (tflag){
57 ar << boost::serialization::make_nvp("value", *t);
58 }
59 }
60
61 template<class Archive, class T>
load(Archive & ar,boost::optional<T> & t,const unsigned int version)62 void load(
63 Archive & ar,
64 boost::optional< T > & t,
65 const unsigned int version
66 ){
67 bool tflag;
68 ar >> boost::serialization::make_nvp("initialized", tflag);
69 if(! tflag){
70 t.reset();
71 return;
72 }
73
74 if(0 == version){
75 boost::serialization::item_version_type item_version(0);
76 boost::serialization::library_version_type library_version(
77 ar.get_library_version()
78 );
79 if(boost::serialization::library_version_type(3) < library_version){
80 ar >> BOOST_SERIALIZATION_NVP(item_version);
81 }
82 }
83 if(! t.is_initialized())
84 t = T();
85 ar >> boost::serialization::make_nvp("value", *t);
86 }
87
88 template<class Archive, class T>
serialize(Archive & ar,boost::optional<T> & t,const unsigned int version)89 void serialize(
90 Archive & ar,
91 boost::optional< T > & t,
92 const unsigned int version
93 ){
94 boost::serialization::split_free(ar, t, version);
95 }
96
97 template<class T>
98 struct version<boost::optional<T> > {
99 BOOST_STATIC_CONSTANT(int, value = 1);
100 };
101
102 } // serialization
103 } // boost
104
105 #endif // BOOST_SERIALIZATION_OPTIONAL_HPP_
106