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
21#include <boost/serialization/item_version_type.hpp>
22#include <boost/serialization/library_version_type.hpp>
23#include <boost/serialization/version.hpp>
24#include <boost/serialization/split_free.hpp>
25#include <boost/serialization/nvp.hpp>
26#include <boost/type_traits/is_pointer.hpp>
27#include <boost/serialization/detail/is_default_constructible.hpp>
28
29// function specializations must be defined in the appropriate
30// namespace - boost::serialization
31namespace boost {
32namespace serialization {
33
34template<class Archive, class T>
35void save(
36 Archive & ar,
37 const boost::optional< T > & t,
38 const unsigned int /*version*/
39){
40 // It is an inherent limitation to the serialization of optional.hpp
41 // that the underlying type must be either a pointer or must have a
42 // default constructor. It's possible that this could change sometime
43 // in the future, but for now, one will have to work around it. This can
44 // be done by serialization the optional<T> as optional<T *>
45 #if ! defined(BOOST_NO_CXX11_HDR_TYPE_TRAITS)
46 BOOST_STATIC_ASSERT(
47 boost::serialization::detail::is_default_constructible<T>::value
48 || boost::is_pointer<T>::value
49 );
50 #endif
51 const bool tflag = t.is_initialized();
52 ar << boost::serialization::make_nvp(n: "initialized", v: tflag);
53 if (tflag){
54 ar << boost::serialization::make_nvp("value", *t);
55 }
56}
57
58template<class Archive, class T>
59void load(
60 Archive & ar,
61 boost::optional< T > & t,
62 const unsigned int version
63){
64 bool tflag;
65 ar >> boost::serialization::make_nvp(n: "initialized", v&: tflag);
66 if(! tflag){
67 t.reset();
68 return;
69 }
70
71 if(0 == version){
72 boost::serialization::item_version_type item_version(0);
73 boost::serialization::library_version_type library_version(
74 ar.get_library_version()
75 );
76 if(boost::serialization::library_version_type(3) < library_version){
77 ar >> BOOST_SERIALIZATION_NVP(item_version);
78 }
79 }
80 if(! t.is_initialized())
81 t = T();
82 ar >> boost::serialization::make_nvp("value", *t);
83}
84
85template<class Archive, class T>
86void serialize(
87 Archive & ar,
88 boost::optional< T > & t,
89 const unsigned int version
90){
91 boost::serialization::split_free(ar, t, version);
92}
93
94template<class T>
95struct version<boost::optional<T> > {
96 BOOST_STATIC_CONSTANT(int, value = 1);
97};
98
99} // serialization
100} // boost
101
102#endif // BOOST_SERIALIZATION_OPTIONAL_HPP_
103