1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
|
// Copyright (c) 2014, The Monero Project
//
// All rights reserved.
//
// Redistribution and use in source and binary forms, with or without modification, are
// permitted provided that the following conditions are met:
//
// 1. Redistributions of source code must retain the above copyright notice, this list of
// conditions and the following disclaimer.
//
// 2. Redistributions in binary form must reproduce the above copyright notice, this list
// of conditions and the following disclaimer in the documentation and/or other
// materials provided with the distribution.
//
// 3. Neither the name of the copyright holder nor the names of its contributors may be
// used to endorse or promote products derived from this software without specific
// prior written permission.
//
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY
// EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
// MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL
// THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
// PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
// INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
// STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF
// THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
//
// Parts of this file are originally copyright (c) 2012-2013 The Cryptonote developers
/*! \file variant.h
*
* \brief for dealing with variants
*
* \detailed Variant: OOP Union
*/
#pragma once
#include <boost/variant/variant.hpp>
#include <boost/variant/apply_visitor.hpp>
#include <boost/variant/static_visitor.hpp>
#include <boost/mpl/empty.hpp>
#include <boost/mpl/if.hpp>
#include <boost/mpl/front.hpp>
#include <boost/mpl/pop_front.hpp>
#include "serialization.h"
/*! \struct variant_serialization_triats
*
* \brief used internally to contain a variant's traits/possible types
*
* \detailed see the macro VARIANT_TAG in serialization.h:140
*/
template <class Archive, class T>
struct variant_serialization_traits
{
};
/*! \struct variant_reader
*
* \brief reads a variant
*/
template <class Archive, class Variant, class TBegin, class TEnd>
struct variant_reader
{
typedef typename Archive::variant_tag_type variant_tag_type;
typedef typename boost::mpl::next<TBegin>::type TNext;
typedef typename boost::mpl::deref<TBegin>::type current_type;
// A tail recursive inline function.... okay...
static inline bool read(Archive &ar, Variant &v, variant_tag_type t)
{
if(variant_serialization_traits<Archive, current_type>::get_tag() == t) {
current_type x;
if(!::do_serialize(ar, x))
{
ar.stream().setstate(std::ios::failbit);
return false;
}
v = x;
} else {
// Tail recursive.... but no mutation is going on. Why?
return variant_reader<Archive, Variant, TNext, TEnd>::read(ar, v, t);
}
return true;
}
};
// This one just fails when you call it.... okay
// So the TEnd parameter must be specified/differnt from TBegin
template <class Archive, class Variant, class TBegin>
struct variant_reader<Archive, Variant, TBegin, TBegin>
{
typedef typename Archive::variant_tag_type variant_tag_type;
static inline bool read(Archive &ar, Variant &v, variant_tag_type t)
{
ar.stream().setstate(std::ios::failbit);
return false;
}
};
template <template <bool> class Archive, BOOST_VARIANT_ENUM_PARAMS(typename T)>
struct serializer<Archive<false>, boost::variant<BOOST_VARIANT_ENUM_PARAMS(T)>>
{
typedef boost::variant<BOOST_VARIANT_ENUM_PARAMS(T)> variant_type;
typedef typename Archive<false>::variant_tag_type variant_tag_type;
typedef typename variant_type::types types;
static bool serialize(Archive<false> &ar, variant_type &v) {
variant_tag_type t;
ar.begin_variant();
ar.read_variant_tag(t);
if(!variant_reader<Archive<false>, variant_type,
typename boost::mpl::begin<types>::type,
typename boost::mpl::end<types>::type>::read(ar, v, t))
{
ar.stream().setstate(std::ios::failbit);
return false;
}
ar.end_variant();
return true;
}
};
template <template <bool> class Archive, BOOST_VARIANT_ENUM_PARAMS(typename T)>
struct serializer<Archive<true>, boost::variant<BOOST_VARIANT_ENUM_PARAMS(T)>>
{
typedef boost::variant<BOOST_VARIANT_ENUM_PARAMS(T)> variant_type;
//typedef typename Archive<true>::variant_tag_type variant_tag_type;
struct visitor : public boost::static_visitor<bool>
{
Archive<true> &ar;
visitor(Archive<true> &a) : ar(a) { }
template <class T>
bool operator ()(T &rv) const
{
ar.begin_variant();
ar.write_variant_tag(variant_serialization_traits<Archive<true>, T>::get_tag());
if(!::do_serialize(ar, rv))
{
ar.stream().setstate(std::ios::failbit);
return false;
}
ar.end_variant();
return true;
}
};
static bool serialize(Archive<true> &ar, variant_type &v) {
return boost::apply_visitor(visitor(ar), v);
}
};
|
