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1 | #ifndef BOOST_SERIALIZATION_TRACKING_HPP |
2 | #define BOOST_SERIALIZATION_TRACKING_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 | // tracking.hpp: | |
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 <boost/config.hpp> | |
20 | #include <boost/static_assert.hpp> | |
21 | #include <boost/mpl/eval_if.hpp> | |
22 | #include <boost/mpl/identity.hpp> | |
23 | #include <boost/mpl/int.hpp> | |
24 | #include <boost/mpl/equal_to.hpp> | |
25 | #include <boost/mpl/greater.hpp> | |
26 | #include <boost/mpl/integral_c_tag.hpp> | |
27 | ||
28 | #include <boost/type_traits/is_base_and_derived.hpp> | |
29 | #include <boost/type_traits/is_pointer.hpp> | |
30 | #include <boost/serialization/level.hpp> | |
31 | #include <boost/serialization/tracking_enum.hpp> | |
32 | #include <boost/serialization/type_info_implementation.hpp> | |
33 | ||
34 | namespace boost { | |
35 | namespace serialization { | |
36 | ||
37 | struct basic_traits; | |
38 | ||
39 | // default tracking level | |
40 | template<class T> | |
41 | struct tracking_level_impl { | |
42 | template<class U> | |
43 | struct traits_class_tracking { | |
44 | typedef typename U::tracking type; | |
45 | }; | |
46 | typedef mpl::integral_c_tag tag; | |
47 | // note: at least one compiler complained w/o the full qualification | |
48 | // on basic traits below | |
49 | typedef | |
50 | typename mpl::eval_if< | |
51 | is_base_and_derived<boost::serialization::basic_traits, T>, | |
52 | traits_class_tracking< T >, | |
53 | //else | |
54 | typename mpl::eval_if< | |
55 | is_pointer< T >, | |
56 | // pointers are not tracked by default | |
57 | mpl::int_<track_never>, | |
58 | //else | |
59 | typename mpl::eval_if< | |
60 | // for primitives | |
61 | typename mpl::equal_to< | |
62 | implementation_level< T >, | |
63 | mpl::int_<primitive_type> | |
64 | >, | |
65 | // is never | |
66 | mpl::int_<track_never>, | |
67 | // otherwise its selective | |
68 | mpl::int_<track_selectively> | |
69 | > > >::type type; | |
70 | BOOST_STATIC_CONSTANT(int, value = type::value); | |
71 | }; | |
72 | ||
73 | template<class T> | |
74 | struct tracking_level : | |
75 | public tracking_level_impl<const T> | |
76 | { | |
77 | }; | |
78 | ||
79 | template<class T, enum tracking_type L> | |
80 | inline bool operator>=(tracking_level< T > t, enum tracking_type l) | |
81 | { | |
82 | return t.value >= (int)l; | |
83 | } | |
84 | ||
85 | } // namespace serialization | |
86 | } // namespace boost | |
87 | ||
88 | ||
89 | // The STATIC_ASSERT is prevents one from setting tracking for a primitive type. | |
90 | // This almost HAS to be an error. Doing this will effect serialization of all | |
91 | // char's in your program which is almost certainly what you don't want to do. | |
92 | // If you want to track all instances of a given primitive type, You'll have to | |
93 | // wrap it in your own type so its not a primitive anymore. Then it will compile | |
94 | // without problem. | |
95 | #define BOOST_CLASS_TRACKING(T, E) \ | |
96 | namespace boost { \ | |
97 | namespace serialization { \ | |
98 | template<> \ | |
99 | struct tracking_level< T > \ | |
100 | { \ | |
101 | typedef mpl::integral_c_tag tag; \ | |
102 | typedef mpl::int_< E> type; \ | |
103 | BOOST_STATIC_CONSTANT( \ | |
104 | int, \ | |
105 | value = tracking_level::type::value \ | |
106 | ); \ | |
107 | /* tracking for a class */ \ | |
108 | BOOST_STATIC_ASSERT(( \ | |
109 | mpl::greater< \ | |
110 | /* that is a prmitive */ \ | |
111 | implementation_level< T >, \ | |
112 | mpl::int_<primitive_type> \ | |
113 | >::value \ | |
114 | )); \ | |
115 | }; \ | |
116 | }} | |
117 | ||
118 | #endif // BOOST_SERIALIZATION_TRACKING_HPP |