Re: [Boost-users] DeSerialization to update content of object insteadof construct new object

From: Robert Ramey (ramey_at_[hidden])
Date: 2007-05-15 11:02:52

The code for serialization of a vector is found in serialization/vector.hpp.

I implemented this code to reconstuct the vector items rather than
just reload them.  I did this for a number of reasons - which for
this discussion are not important.

If this doesn't suit your needs, I would suggest you make your own
version of serialization.hpp which operates differently.  Starting
with the current version it wouldn't be at all hard to do.

If you want to use both current ("standard") method in some
places in addition to your "custom" method, you might consider
making some sort of wrapper which tags your special
vectors with a type which can be distinguished for special
serialization treatment.

Robert Ramey

Ng Pan wrote:
> Hi
>
> I am using boost serialization to synchronise objects between
> different computers (network). The objects would be serializated as a
> string instead of a file by using the class stringstream(instead of
> fstream). The string would be transferred via TCP/IP layer.
>
> Let simpify the situation as only two computers (Master and Slave)
> ,both of two computers have N objects and I wanna synchronise their
> content. I create a vector of pointer ( std::vector<base *> m_vpBase
> ) which points to the dirty objects. Both of two computers have this
> vector. Let assume the vectors are already pointing to the
> corresponding objects. For Tx side, it would serialize the objects as
> a string. For Rx side, I want to update the content of the objects
> that its vector is pointing to.
>
> Tx side:
> oa << BOOST_SERIALIZATION_NVP(m_vpBase);
>
> Rx side:
> oa >> BOOST_SERIALIZATION_NVP(m_vpBase );
>
> However, the above code would construct new objects.
>
> What i want is just update the content of the objects , not construct
> new objects.
>
> I know how to update the content for one object by using pointer (
> base * m_pBase).
> Tx side:
> oa << BOOST_SERIALIZATION_NVP(m_pBase);
>
> Rx side:
> oa >> BOOST_SERIALIZATION_NVP(*m_pBase);
>
>
> But, I don't know how to do for a vector of pointer. If you know,
> please give me some hints. Thank you very much.
>
> Regards
> Barr Ng
> [I found Boost serialization is useful and easy to use. ]
>
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