blob: 608837e2230ec512aca4baf7e24dfef547bd7756 (
plain)
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
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
|
/////////1/////////2/////////3/////////4/////////5/////////6/////////7/////////8
// test_enable_shared_from_this.cpp
// (C) Copyright 2002 Robert Ramey - http://www.rrsd.com .
// Use, modification and distribution is subject to the Boost Software
// License, Version 1.0. (See accompanying file LICENSE_1_0.txt or copy at
// http://www.boost.org/LICENSE_1_0.txt)
// This demonstrates a problem with boost::serialization and boost::enable_shared_from_this.
// (boost version 1.53)
// See boost TRAC ticket #9567
//
// Given the following class structure:
// Base is a simple class
// Derived inherits from Base
// Derived also inherits from boost::enable_shared_from_this<Derived>
// Base and Derived implement boost::serialization
//
// When deserializing an instance of Derived into a vector of boost::shared_ptr<Derived>:
// Base and Derived members are reconstructed correctly.
// Derived::shared_from_this() works as expected.
//
// But when deserializing an instance of Derived into a vector of boost::shared_ptr<Base>:
// Base and Derived members are still reconstructed correctly.
// Derived::shared_from_this() throws a bad_weak_ptr exception.
// This is because enable_shared_from_this::weak_ptr is NOT reconstructed - It is zero.
#include <sstream>
#include <boost/archive/text_oarchive.hpp>
#include <boost/archive/text_iarchive.hpp>
#include <boost/enable_shared_from_this.hpp>
#include <boost/serialization/shared_ptr.hpp>
#include <boost/serialization/export.hpp>
#include <boost/serialization/split_free.hpp>
#include "test_tools.hpp"
#include <set>
namespace boost {
namespace serialization {
struct enable_shared_from_this_helper {
std::set<shared_ptr<void> > m_esfth;
void record(boost::shared_ptr<void> sp){
m_esfth.insert(sp);
}
};
template<class Archive, class T>
void serialize(
Archive & ar,
boost::enable_shared_from_this<T> & t,
const unsigned int file_version
){
enable_shared_from_this_helper & h =
ar.template get_helper<
enable_shared_from_this_helper
>();
shared_ptr<T> sp = t.shared_from_this();
h.record(sp);
}
} // serialization
} // boost
class Base {
friend class boost::serialization::access;
template<class Archive>
void serialize(Archive & ar, const unsigned int version)
{
ar & BOOST_SERIALIZATION_NVP(m_base);
}
protected:
Base() {}
virtual ~Base() {} // "virtual" forces RTTI, to enable serialization of Derived from Base pointer
public:
int m_base;
};
class Derived : public Base, public boost::enable_shared_from_this<Derived> {
friend class boost::serialization::access;
template<class Archive>
void serialize(Archive & ar, const unsigned int version)
{
ar & BOOST_SERIALIZATION_BASE_OBJECT_NVP(Base);
ar & BOOST_SERIALIZATION_BASE_OBJECT_NVP(
boost::enable_shared_from_this<Derived>
);
ar & BOOST_SERIALIZATION_NVP(m_derived);
}
public:
boost::shared_ptr<Derived> SharedPtr() { return shared_from_this(); }
int m_derived;
Derived() {}
~Derived() {}
};
// The following is required to enable serialization from Base pointer
BOOST_CLASS_EXPORT(Derived)
// This test passes
void test_passes(){
std::stringstream ss;
{
boost::shared_ptr<Derived> d(new Derived());
d->m_base = 1;
d->m_derived = 2;
// Get a raw pointer to Derived
Derived* raw_d = d.get();
// Verify base and derived members
BOOST_CHECK(raw_d->m_base==1);
BOOST_CHECK(raw_d->m_derived==2);
// verify shared_from_this
BOOST_CHECK(d == raw_d->SharedPtr());
boost::archive::text_oarchive oa(ss);
oa & BOOST_SERIALIZATION_NVP(d);
}
{
// Deserialize it back into a vector of shared_ptr<Derived>
boost::shared_ptr<Derived> d;
ss.seekg(0);
boost::archive::text_iarchive ia(ss);
ia & BOOST_SERIALIZATION_NVP(d);
// Get a raw pointer to Derived
Derived* raw_d = d.get();
// Verify base and derived members
BOOST_CHECK(raw_d->m_base==1);
BOOST_CHECK(raw_d->m_derived==2);
// verify shared_from_this
BOOST_CHECK(d == raw_d->SharedPtr());
}
}
// This test fails
void test_fails(){
std::stringstream ss;
{
boost::shared_ptr<Base> b(new Derived());
Derived* raw_d1 = static_cast<Derived*>(b.get());
raw_d1->m_base = 1;
raw_d1->m_derived = 2;
// Get a raw pointer to Derived via shared_ptr<Base>
Derived* raw_d = static_cast<Derived*>(b.get());
// Verify base and derived members
BOOST_CHECK(raw_d->m_base==1);
BOOST_CHECK(raw_d->m_derived==2);
// verify shared_from_this
boost::shared_ptr<Derived> d = raw_d->SharedPtr();
BOOST_CHECK(d == b);
// Serialize the vector
boost::archive::text_oarchive oa(ss);
oa & BOOST_SERIALIZATION_NVP(b);
}
{
// Deserialize it back into a vector of shared_ptr<Base>
ss.seekg(0);
boost::archive::text_iarchive ia(ss);
boost::shared_ptr<Base> b;
ia & BOOST_SERIALIZATION_NVP(b);
// Get a raw pointer to Derived via shared_ptr<Base>
Derived* raw_d = static_cast<Derived*>(b.get());
// Verify base and derived members
BOOST_CHECK(raw_d->m_base==1);
BOOST_CHECK(raw_d->m_derived==2);
// verify shared_from_this
// FAIL: The following line throws bad_weak_ptr exception
boost::shared_ptr<Derived> d = raw_d->SharedPtr();
BOOST_CHECK(d == b);
}
}
int test_main(int /*argc*/, char * /*argv */[]){
test_fails();
test_passes();
return EXIT_SUCCESS;
}
// EOF
|
