[英]How to serialize a union within a struct using Boost library?
我想序列化并存储在结构体中声明的并集，并将其存储在boost::message_queue因为我们无法在消息队列中存储和检索结构体对象。
我已经序列化并存储了这样的结构，并且工作正常。
typedef struct
{
unsigned short m_short1;
unsigned short m_short2;
unsigned char m_character;
template <typename Archive>
void serialize(Archive& ar, const unsigned int version)
{
ar & m_short1;
ar & m_short2;
ar & m_character;
}
} MyDataType;
但是我想存储一个具有并集和子结构的结构对象，如下所示
typedef struct
{
int msg_type;
char msg_name[100];
union
{
struct
{
int ID;
char ReportedTime[100];
char ReceivedAt[200];
int Number;
} mess1;
struct
{
char host_ip[20];
char mac_addr[30];
char time_stamp[100];
}mess2;
}struct_type;
}msg_struct;
为了序列化，我确实是这样。
typedef struct
{
int msg_type;
char msg_name[100];
union
{
struct
{
int ID;
char ReportedTime[100];
char ReceivedAt[200];
int Number;
template <typename Archive>
void serialize(Archive& ar, const unsigned int version)
{
ar & ID;
ar & DeviceReportedTime;
ar & ReceivedAt;
ar & Number;
}
} mess1;
struct
{
char host_ip[20];
char mac_addr[30];
char time_stamp[100];
template <typename Archive>
void serialize(Archive& ar, const unsigned int version)
{
ar & host_ip;
ar & mac_addr;
ar & time_stamp;
}
}mess2;
template <typename Archive>
void serialize(Archive& ar, const unsigned int version)
{
ar & mess1;
ar & mess2;
}
}struct_type;
template <typename Archive>
void serialize(Archive& ar, const unsigned int version)
{
ar & msg_type;
ar & msg_name;
ar & struct_type;
}
}msg_struct;
这是正确的方法，但是却出现了以下错误
from ControlQueue.cpp:1:
/usr/local/include/boost/archive/detail/check.hpp: In instantiation of ‘void boost::archive::detail::check_object_level() [with T = msg_struct::<anonymous union>]’:
/usr/local/include/boost/archive/detail/iserializer.hpp:438:33: required from ‘static void boost::archive::detail::load_non_pointer_type<Archive>::invoke(Archive&, T&) [with T = msg_struct::<anonymous union>; Archive = boost::archive::text_iarchive]’
/usr/local/include/boost/archive/detail/iserializer.hpp:592:24: required from ‘void boost::archive::load(Archive&, T&) [with Archive = boost::archive::text_iarchive; T = msg_struct::<anonymous union>]’
/usr/local/include/boost/archive/detail/common_iarchive.hpp:66:40: required from ‘void boost::archive::detail::common_iarchive<Archive>::load_override(T&, int) [with T = msg_struct::<anonymous union>; Archive = boost::archive::text_iarchive]’
/usr/local/include/boost/archive/basic_text_iarchive.hpp:65:9: required from ‘void boost::archive::basic_text_iarchive<Archive>::load_override(T&, int) [with T = msg_struct::<anonymous union>; Archive = boost::archive::text_iarchive]’
/usr/local/include/boost/archive/text_iarchive.hpp:82:57: required from ‘void boost::archive::text_iarchive_impl<Archive>::load_override(T&, int) [with T = msg_struct::<anonymous union>; Archive = boost::archive::text_iarchive]’
/usr/local/include/boost/archive/detail/interface_iarchive.hpp:60:9: [ skipping 15 instantiation contexts, use -ftemplate-backtrace-limit=0 to disable ]
/usr/local/include/boost/archive/detail/iserializer.hpp:592:24: required from ‘void boost::archive::load(Archive&, T&) [with Archive = boost::archive::text_iarchive; T = msg_struct*]’
/usr/local/include/boost/archive/detail/common_iarchive.hpp:66:40: required from ‘void boost::archive::detail::common_iarchive<Archive>::load_override(T&, int) [with T = msg_struct*; Archive = boost::archive::text_iarchive]’
/usr/local/include/boost/archive/basic_text_iarchive.hpp:65:9: required from ‘void boost::archive::basic_text_iarchive<Archive>::load_override(T&, int) [with T = msg_struct*; Archive = boost::archive::text_iarchive]’
/usr/local/include/boost/archive/text_iarchive.hpp:82:57: required from ‘void boost::archive::text_iarchive_impl<Archive>::load_override(T&, int) [with T = msg_struct*; Archive = boost::archive::text_iarchive]’
/usr/local/include/boost/archive/detail/interface_iarchive.hpp:60:9: required from ‘Archive& boost::archive::detail::interface_iarchive<Archive>::operator>>(T&) [with T = msg_struct*; Archive = boost::archive::text_iarchive]’
ControlQueue.cpp:177:15: required from here
/usr/local/include/boost/archive/detail/check.hpp:60:5: error: static assertion failed: typex::value
BOOST_STATIC_ASSERT(typex::value);
^
make: *** [ControlQueue.o] Error 1
注意：我使用的是make文件，并包含所有链接库。
如何解决这个问题呢
我注意到您花了很多精力来保持POD结构。 您可以使用
BOOST_IS_BITWISE_SERIALIZABLE(msg_struct)
完成序列化。 奇怪的是，这似乎仅限于POD数组 ，但是C ++标准允许我们将单个对象视为单元素数组，因此我们可以：
struct msg_struct {
int msg_type;
char msg_name[100];
union X {
struct {
int ID;
char ReportedTime[100];
char ReceivedAt[200];
int Number;
} mess1;
struct XB {
char host_ip[20];
char mac_addr[30];
char time_stamp[100];
} mess2;
} struct_type;
};
#include <boost/serialization/is_bitwise_serializable.hpp>
BOOST_IS_BITWISE_SERIALIZABLE(msg_struct)
可以完成序列化/反序列化： 在Coliru上现场观看
int main()
{
std::stringstream ss;
boost::archive::binary_oarchive oa(ss);
msg_struct msg;
strncpy(msg.msg_name, "msg_name", sizeof(msg.msg_name));
strncpy(msg.struct_type.mess1.ReportedTime, "ReportedTime", sizeof(msg.struct_type.mess1.ReportedTime));
strncpy(msg.struct_type.mess1.ReceivedAt, "ReceivedAt", sizeof(msg.struct_type.mess1.ReceivedAt));
strncpy(msg.struct_type.mess2.host_ip, "host_ip", sizeof(msg.struct_type.mess2.host_ip));
strncpy(msg.struct_type.mess2.mac_addr, "mac_addr", sizeof(msg.struct_type.mess2.mac_addr));
strncpy(msg.struct_type.mess2.time_stamp, "time_stamp", sizeof(msg.struct_type.mess2.time_stamp));
oa << boost::serialization::make_array(&msg, 1);
for(auto c : ss.str())
std::cout << std::hex << std::setfill('0') << std::setw(2) << ((int) c);
boost::archive::binary_iarchive ia(ss);
ia >> boost::serialization::make_array(&msg, 1);
}
struct msg_struct {
int msg_type;
char msg_name[100];
union X {
struct {
int ID;
char ReportedTime[100];
char ReceivedAt[200];
int Number;
} mess1;
struct XB {
char host_ip[20];
char mac_addr[30];
char time_stamp[100];
} mess2;
} struct_type;
};
#include <boost/serialization/is_bitwise_serializable.hpp>
BOOST_IS_BITWISE_SERIALIZABLE(msg_struct)
#include <boost/archive/binary_oarchive.hpp>
#include <boost/archive/binary_iarchive.hpp>
#include <sstream>
#include <iostream>
#include <cstring>
#include <iomanip>
int main()
{
std::stringstream ss;
boost::archive::binary_oarchive oa(ss);
msg_struct msg;
strncpy(msg.msg_name, "msg_name", sizeof(msg.msg_name));
strncpy(msg.struct_type.mess1.ReportedTime, "ReportedTime", sizeof(msg.struct_type.mess1.ReportedTime));
strncpy(msg.struct_type.mess1.ReceivedAt, "ReceivedAt", sizeof(msg.struct_type.mess1.ReceivedAt));
strncpy(msg.struct_type.mess2.host_ip, "host_ip", sizeof(msg.struct_type.mess2.host_ip));
strncpy(msg.struct_type.mess2.mac_addr, "mac_addr", sizeof(msg.struct_type.mess2.mac_addr));
strncpy(msg.struct_type.mess2.time_stamp, "time_stamp", sizeof(msg.struct_type.mess2.time_stamp));
oa << boost::serialization::make_array(&msg, 1);
for(auto c : ss.str())
std::cout << std::hex << std::setfill('0') << std::setw(2) << ((int) c);
boost::archive::binary_iarchive ia(ss);
ia >> boost::serialization::make_array(&msg, 1);
}
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