boost::serialization - trying to serialize derived class and base class. - Boost-users

newer
[serialization] Is anybody else...

boost::serialization - trying to serialize derived class and base class.

j.c.

14 Apr 2008 14 Apr '08

11:51 a.m.

I am writing a packet base class that can be serialized. The class so far looks like: class packet_base { using namespace boost; public: packet_base(); ~packet_base(); friend class boost::serialization::access; template <typename Archive> void serialize(Archive & ar, const unsigned int version) { ar & m_length; ar & m_type; ar & m_method; } private: uint16_t m_length; uint16_t m_type; uint16_t m_method; }; The question now is how can I derive class A from packet_base and have both packet_base and A's variables serialized? Obviously base_class needs to be archived first so it's variables are at the front of the buffer. Thanks in advance. J

Attachments:

attachment.html (text/html — 5.9 KB)

Show replies by date

Robert Ramey

14 Apr 14 Apr

3:31 p.m.

New subject: boost::serialization - trying to serialize derivedclass and base class.

lookup base_object in the documentation. Robert Ramey "j.c." wrote in message news:CB290CFC-9ABD-4FF9-80C1-766E3063F8A6@mac.com... I am writing a packet base class that can be serialized. The class so far looks like: class packet_base { using namespace boost; public: packet_base(); ~packet_base(); friend class boost::serialization::access; template <typename Archive> void serialize(Archive & ar, const unsigned int version) { ar & m_length; ar & m_type; ar & m_method; } private: uint16_t m_length; uint16_t m_type; uint16_t m_method; }; The question now is how can I derive class A from packet_base and have both packet_base and A's variables serialized? Obviously base_class needs to be archived first so it's variables are at the front of the buffer. Thanks in advance. J ------------------------------------------------------------------------------ _______________________________________________ Boost-users mailing list Boost-users@lists.boost.org http://lists.boost.org/mailman/listinfo.cgi/boost-users

j.c.

3:21 p.m.

New subject: boost::serialization - trying to serialize derivedclass and base class.

Sweet, just what I was looking for, thanks. On Apr 14, 2008, at 8:31 AM, Robert Ramey wrote:

...

lookup base_object in the documentation.

Robert Ramey

"j.c." wrote in message news:CB290CFC-9ABD-4FF9-80C1-766E3063F8A6@mac.com ... I am writing a packet base class that can be serialized. The class so far looks like:

class packet_base { using namespace boost;

public: packet_base(); ~packet_base();

friend class boost::serialization::access; template <typename Archive> void serialize(Archive & ar, const unsigned int version) { ar & m_length; ar & m_type; ar & m_method; }

private:

uint16_t m_length; uint16_t m_type; uint16_t m_method; };

The question now is how can I derive class A from packet_base and have both packet_base and A's variables serialized? Obviously base_class needs to be archived first so it's variables are at the front of the buffer.

Thanks in advance. J

_______________________________________________ Boost-users mailing list Boost-users@lists.boost.org http://lists.boost.org/mailman/listinfo.cgi/boost-users _______________________________________________ Boost-users mailing list Boost-users@lists.boost.org http://lists.boost.org/mailman/listinfo.cgi/boost-users

j.c.

8:02 p.m.

New subject: boost::serialization - extra 6 bytes overhead question?

ok I have this working, however... packet_base: 12 packet_ping: 44 0 1 0 0 0 1001 44 2 3 7 32 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 ^ packet actually starts here(packet_length). There are 6 extra bytes overhead I know that 1001 is my class version. What are 0, 1, 0, 0 and 0? I need this info for writing packet de-serialization in other languages. Thanks in advance. On Apr 14, 2008, at 8:21 AM, j.c. wrote:

...

Sweet, just what I was looking for, thanks.

On Apr 14, 2008, at 8:31 AM, Robert Ramey wrote:

...
lookup base_object in the documentation.

Robert Ramey

"j.c." wrote in message news:CB290CFC-9ABD-4FF9-80C1-766E3063F8A6@mac.com ... I am writing a packet base class that can be serialized. The class so far looks like:

class packet_base { using namespace boost;

public: packet_base(); ~packet_base();

friend class boost::serialization::access; template <typename Archive> void serialize(Archive & ar, const unsigned int version) { ar & m_length; ar & m_type; ar & m_method; }

private:

uint16_t m_length; uint16_t m_type; uint16_t m_method; };

The question now is how can I derive class A from packet_base and have both packet_base and A's variables serialized? Obviously base_class needs to be archived first so it's variables are at the front of the buffer.

Thanks in advance. J

_______________________________________________ Boost-users mailing list Boost-users@lists.boost.org http://lists.boost.org/mailman/listinfo.cgi/boost-users _______________________________________________ Boost-users mailing list Boost-users@lists.boost.org http://lists.boost.org/mailman/listinfo.cgi/boost-users

_______________________________________________ Boost-users mailing list Boost-users@lists.boost.org http://lists.boost.org/mailman/listinfo.cgi/boost-users

Robert Ramey

11:23 p.m.

New subject: boost::serialization - extra 6 bytes overheadquestion?

try using the xml_archive - all the "extra" bytes show up as labeled attributes. Robert Ramey "j.c." wrote in message news:F58B74D0-78DC-4E07-ABD5-3F0C7BAC831B@mac.com... ok I have this working, however... packet_base: 12 packet_ping: 44 0 1 0 0 0 1001 44 2 3 7 32 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 ^ packet actually starts here(packet_length). There are 6 extra bytes overhead I know that 1001 is my class version. What are 0, 1, 0, 0 and 0? I need this info for writing packet de-serialization in other languages. Thanks in advance. On Apr 14, 2008, at 8:21 AM, j.c. wrote: Sweet, just what I was looking for, thanks. On Apr 14, 2008, at 8:31 AM, Robert Ramey wrote: lookup base_object in the documentation. Robert Ramey "j.c." wrote in message news:CB290CFC-9ABD-4FF9-80C1-766E3063F8A6@mac.com... I am writing a packet base class that can be serialized. The class so far looks like: class packet_base { using namespace boost; public: packet_base(); ~packet_base(); friend class boost::serialization::access; template <typename Archive> void serialize(Archive & ar, const unsigned int version) { ar & m_length; ar & m_type; ar & m_method; } private: uint16_t m_length; uint16_t m_type; uint16_t m_method; }; The question now is how can I derive class A from packet_base and have both packet_base and A's variables serialized? Obviously base_class needs to be archived first so it's variables are at the front of the buffer. Thanks in advance. J ------------------------------------------------------------------------ _______________________________________________ Boost-users mailing list Boost-users@lists.boost.org http://lists.boost.org/mailman/listinfo.cgi/boost-users _______________________________________________ Boost-users mailing list Boost-users@lists.boost.org http://lists.boost.org/mailman/listinfo.cgi/boost-users _______________________________________________ Boost-users mailing list Boost-users@lists.boost.org http://lists.boost.org/mailman/listinfo.cgi/boost-users ------------------------------------------------------------------------------ _______________________________________________ Boost-users mailing list Boost-users@lists.boost.org http://lists.boost.org/mailman/listinfo.cgi/boost-users

j.c.

15 Apr 15 Apr

1:01 a.m.

New subject: boost::serialization - extra 6 bytes overheadquestion?

Nothing lines up, if I set class version then the last parameter is set. Also I think these are int's which is quite large(6 * sizefof(int)) for a packet header. packet_ping: 44 <?xml version="1.0" encoding="UTF-8" standalone="yes" ?> <!DOCTYPE boost_serialization> <tst2 class_id="0" tracking_level="1" version="0" object_id="_0"> </tst2> On Apr 14, 2008, at 4:23 PM, Robert Ramey wrote:

...

try using the xml_archive - all the "extra" bytes show up as labeled attributes.

Robert Ramey "j.c." wrote in message news:F58B74D0-78DC-4E07-ABD5-3F0C7BAC831B@mac.com ... ok I have this working, however...

packet_base: 12 packet_ping: 44 0 1 0 0 0 1001 44 2 3 7 32 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 ^ packet actually starts here(packet_length).

There are 6 extra bytes overhead I know that 1001 is my class version. What are 0, 1, 0, 0 and 0?

I need this info for writing packet de-serialization in other languages.

Thanks in advance.

On Apr 14, 2008, at 8:21 AM, j.c. wrote:

...
Sweet, just what I was looking for, thanks.

On Apr 14, 2008, at 8:31 AM, Robert Ramey wrote:

...
lookup base_object in the documentation.

Robert Ramey

"j.c." wrote in message news:CB290CFC-9ABD-4FF9-80C1-766E3063F8A6@mac.com ... I am writing a packet base class that can be serialized. The class so far looks like:

class packet_base { using namespace boost;

public: packet_base(); ~packet_base();

friend class boost::serialization::access; template <typename Archive> void serialize(Archive & ar, const unsigned int version) { ar & m_length; ar & m_type; ar & m_method; }

private:

uint16_t m_length; uint16_t m_type; uint16_t m_method; };

The question now is how can I derive class A from packet_base and have both packet_base and A's variables serialized? Obviously base_class needs to be archived first so it's variables are at the front of the buffer.

Thanks in advance. J

_______________________________________________ Boost-users mailing list Boost-users@lists.boost.org http://lists.boost.org/mailman/listinfo.cgi/boost-users _______________________________________________ Boost-users mailing list Boost-users@lists.boost.org http://lists.boost.org/mailman/listinfo.cgi/boost-users

_______________________________________________ Boost-users mailing list Boost-users@lists.boost.org http://lists.boost.org/mailman/listinfo.cgi/boost-users

_______________________________________________ Boost-users mailing list Boost-users@lists.boost.org http://lists.boost.org/mailman/listinfo.cgi/boost-users _______________________________________________ Boost-users mailing list Boost-users@lists.boost.org http://lists.boost.org/mailman/listinfo.cgi/boost-users

6158

Age (days ago)

6159

Last active (days ago)

List overview

Download

5 comments

2 participants

participants (2)

j.c.
Robert Ramey