source: NonGTP/Boost/boost/serialization/optional.hpp @ 857

Revision 857, 2.9 KB checked in by igarcia, 19 years ago (diff)
Line 
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) && (_MSC_VER >= 1020)
14# pragma once
15#endif
16
17#include <boost/config.hpp>
18
19#include <boost/optional.hpp>
20#include <boost/serialization/split_free.hpp>
21#include <boost/serialization/level.hpp>
22#include <boost/serialization/nvp.hpp>
23#include <boost/serialization/detail/stack_constructor.hpp>
24
25// function specializations must be defined in the appropriate
26// namespace - boost::serialization
27namespace boost {
28namespace serialization {
29
30template<class Archive, class T>
31void save(
32    Archive & ar,
33    const boost::optional<T> & t,
34    const unsigned int /*version*/
35){
36    const bool tflag = t;
37    ar << boost::serialization::make_nvp("initialized", tflag);
38    if (tflag)
39        ar << boost::serialization::make_nvp("value", *t);
40}
41
42template<class Archive, class T>
43void load(
44    Archive & ar,
45    boost::optional<T> & t,
46    const unsigned int /*version*/
47){
48    bool tflag;
49    ar >> boost::serialization::make_nvp("initialized", tflag);
50    if (tflag){
51        detail::stack_construct<Archive, T> aux(ar);
52        ar >> boost::serialization::make_nvp("value", aux.reference());
53        t.reset(aux.reference());
54    }
55    else {
56        t.reset();
57    }
58}
59
60template<class Archive, class T>
61void serialize(
62    Archive & ar,
63    boost::optional<T> & t,
64    const unsigned int version
65){
66    boost::serialization::split_free(ar, t, version);
67}
68
69// the following would be slightly more efficient.  But it
70// would mean that archives created with programs that support
71// TPS wouldn't be readable by programs that don't support TPS.
72// Hence we decline to support this otherwise convenient optimization.
73//#ifndef BOOST_NO_TEMPLATE_PARTIAL_SPECIALIZATION
74#if 0
75
76template <class T>
77struct implementation_level<optional<T> >
78{
79    typedef mpl::integral_c_tag tag;
80    typedef mpl::int_<boost::serialization::object_serializable> type;
81    BOOST_STATIC_CONSTANT(
82        int ,
83        value = boost::serialization::implementation_level::type::value
84    );
85};
86
87template<class T>
88struct tracking_level<optional<T> >
89{
90    typedef mpl::integral_c_tag tag;
91    typedef mpl::int_<boost::serialization::track_never> type;
92    BOOST_STATIC_CONSTANT(
93        int ,
94        value = boost::serialization::tracking_level::type::value
95    );
96};
97
98#endif
99
100} // serialization
101} // namespace boost
102
103#endif // BOOST_SERIALIZATION_OPTIONAL_HPP_
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